prototype for circuitikz logic gate shapes matching IEEE 91-1984 recommendations, using https://tex.stackexchange.com/a/372996/46076 example as baseline

baseline.tex

\documentclass{standalone}
\usepackage{circuitikz}

\ctikzset{tripoles/american and port/origin/.initial=0.8}
\ctikzset{tripoles/american and port/inputs/.initial=2}

\ctikzset{tripoles/american nand port/origin/.initial=0.8}
\ctikzset{tripoles/american nand port/inputs/.initial=2}

\ctikzset{tripoles/american nor port/origin/.initial=0.8}
\ctikzset{tripoles/american nor port/inputs/.initial=2}
\ctikzset{tripoles/american nor port/angle/.initial=70}
\ctikzset{tripoles/american nor port/inner/.initial=0.3}

\ctikzset{tripoles/american or port/origin/.initial=0.8}
\ctikzset{tripoles/american or port/inputs/.initial=2}
\ctikzset{tripoles/american or port/angle/.initial=70}
\ctikzset{tripoles/american or port/inner/.initial=0.3}

\ctikzset{tripoles/american xor port/origin/.initial=0.8}
\ctikzset{tripoles/american xor port/inputs/.initial=2}
\ctikzset{tripoles/american xor port/angle/.initial=70}
\ctikzset{tripoles/american xor port/inner/.initial=0.3}

\ctikzset{tripoles/american xnor port/origin/.initial=0.8}
\ctikzset{tripoles/american xnor port/inputs/.initial=2}
\ctikzset{tripoles/american xnor port/angle/.initial=70}
\ctikzset{tripoles/american xnor port/inner/.initial=0.3}

\pgfkeys{/tikz/number inputs/.initial=0}
\pgfkeys{/tikz/number inputs/.default=0}

\makeatletter
\newcount{\pgf@circ@res@count}% reserve global register

\newcommand{\pgf@circ@logicport@input}[1]% #1 = \pgfmathcounter
{%
  \pgfextracty{\pgf@circ@res@up}{\northeast}%
  \step
  \pgf@circ@res@step=\dimexpr 2\pgf@y -2\pgf@circ@res@up\relax
  \advance\pgf@y by -#1\pgf@circ@res@step\relax
}%
\long\def\pgfcircdeclarelogicport#1#2{%
    \pgfdeclareshape{american #1 port}%
    {%
    \savedmacro\resize{% automatic
      \pgf@circ@res@up = \pgfkeysvalueof{/tikz/circuitikz/tripoles/american #1 port/height}\pgf@circ@Rlen
      \pgf@circ@res@up = .5\pgf@circ@res@up
      \pgf@circ@res@down = -\pgf@circ@res@up
      \pgf@circ@res@right = \pgfkeysvalueof{/tikz/circuitikz/tripoles/american #1 port/width}\pgf@circ@Rlen
      \pgf@circ@res@right = .5\pgf@circ@res@right
      \pgf@circ@res@left = -\pgf@circ@res@right
    }%
    \savedmacro\inputs{% get number of inputs
      \pgf@circ@res@count=\pgfkeysvalueof{/tikz/number inputs}\relax%
      \ifnum\pgf@circ@res@count=0
        \pgf@circ@res@count=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american #1 port/inputs}\relax%
      \fi
      \ifnum\pgf@circ@res@count<2 \pgf@circ@res@count=2\fi
      \ifnum\pgf@circ@res@count>16 \pgf@circ@res@count=16\fi
      \def\inputs{\the\pgf@circ@res@count}%
    }%
    \savedanchor\step{% 1/2 gap at edges
      \pgf@circ@res@step = \pgfkeysvalueof{/tikz/circuitikz/tripoles/american #1 port/height}\pgf@circ@Rlen
      \divide\pgf@circ@res@step by \pgf@circ@res@count
      \pgfpoint{\pgf@circ@res@left}{\dimexpr\pgf@circ@res@up+0.5\pgf@circ@res@step}%
    }%
      \savedanchor\northeast{\pgfpoint{\pgf@circ@res@right}{\pgf@circ@res@up}}
    \savedanchor\southwest{\pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@down}}
    \savedanchor\left{\pgfpoint{\pgfkeysvalueof{/tikz/circuitikz/tripoles/american #1 port/port width}\pgf@circ@res@left}{0pt}}
    \savedanchor\right{\pgfpoint{\pgfkeysvalueof{/tikz/circuitikz/tripoles/american #1 port/port width}\pgf@circ@res@right}{0pt}}
    \savedanchor\origin{\pgfpoint{\pgfkeysvalueof{/tikz/circuitikz/tripoles/american #1 port/origin}\pgf@circ@res@right}{0pt}}

    \anchor{center}{\origin}% for backwards compatibility
    \anchor{text}{\pgfpoint{-.5\wd\pgfnodeparttextbox}{\dimexpr.5\dp\pgfnodeparttextbox-.5\ht\pgfnodeparttextbox}}

% create input anchors
    \expandafter\pgfutil@g@addto@macro\csname pgf@sh@s@american #1 port\endcsname{%
      \pgfmathloop%
      \ifnum\pgfmathcounter>\pgf@circ@res@count%
      \else%
        %\pgfutil@ifundefined{pgf@anchor@american #1 port@in \pgfmathcounter}{%
          \expandafter\xdef\csname pgf@anchor@american #1 port@in \pgfmathcounter\endcsname{%
            \noexpand\pgf@circ@logicport@input{\pgfmathcounter}% defined above
          }%
        %}{}%
      \repeatpgfmathloop%
    }

      \anchor{out}{\pgfpoint{\pgf@circ@res@right}{0pt}}

    \anchor{left}{\left}% edges of component mius leads
    \anchor{right}{\right}

    \anchor{north east}{\northeast}% see \Compass macro
    \anchor{south west}{\southwest}
    \anchor{north}{\pgfextracty{\pgf@circ@res@up}{\northeast}%
      \pgfpoint{0cm}{\pgf@circ@res@up}}
    \anchor{north west}{\pgfextracty{\pgf@circ@res@up}{\northeast}%
      \pgfextractx{\pgf@circ@res@left}{\southwest}%
      \pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@up}}
    \anchor{west}{\pgfextractx{\pgf@circ@res@left}{\sosuthwest}%
      \pgfpoint{\pgf@circ@res@left}{0cm}}
    \anchor{south}{\pgfextracty{\pgf@circ@res@down}{\southwest}%
      \pgfpoint{0cm}{\pgf@circ@res@down}}
    \anchor{south east}{\pgfextracty{\pgf@circ@res@down}{\southwest}%
      \pgfextractx{\pgf@circ@res@right}{\northeast}%
      \pgfpoint{\pgf@circ@res@right}{\pgf@circ@res@down}}
    \anchor{east}{\pgfextractx{\pgf@circ@res@right}{\northeast}%
      \pgfpoint{\pgf@circ@res@right}{0cm}}

      \backgroundpath{          
            \pgfsetcolor{\pgfkeysvalueof{/tikz/circuitikz/color}}   
            #2
      }
    }
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% and %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\pgfcircdeclarelogicport{and}{
  \pgfextracty{\pgf@circ@res@temp}{\step}%
  \pgf@circ@res@step = \dimexpr 2\pgf@circ@res@temp -2\pgf@circ@res@up\relax
  \pgf@circ@res@count = \inputs\relax
  \loop\ifnum\pgf@circ@res@count>0
    \advance\pgf@circ@res@temp by -\pgf@circ@res@step
      \pgfpathmoveto{\pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@temp}}%
    \pgfpathlineto{\pgfpoint
        {\pgfkeysvalueof{/tikz/circuitikz/tripoles/american and port/port width}\pgf@circ@res@left}
        {\pgf@circ@res@temp}}
    \advance\pgf@circ@res@count by -1
  \repeat

    \pgfpathmoveto{\pgfpoint{\pgf@circ@res@right}{0pt}}
    \pgfpathlineto{\pgfpoint
        {\pgfkeysvalueof{/tikz/circuitikz/tripoles/american and port/port width}\pgf@circ@res@right}
        {0pt}}

    \pgfusepath{draw}

    \pgfsetlinewidth{2\pgflinewidth}
  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american and port/port width}\pgf@circ@res@left

    \pgfpathmoveto{\pgfpoint{\pgf@circ@res@other}{\pgf@circ@res@up}}
  \pgfpathlineto{\pgfpoint{\pgf@circ@res@other}{\pgf@circ@res@down}}
  \pgfpatharc{-90}{90}{-2\pgf@circ@res@other and \pgf@circ@res@up}
  \pgfpathclose
    \pgfusepath{draw}
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% nand %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\pgfcircdeclarelogicport{nand}{
    \pgfextracty{\pgf@circ@res@temp}{\step}%
  \pgf@circ@res@step = \dimexpr 2\pgf@circ@res@temp -2\pgf@circ@res@up\relax
  \pgf@circ@res@count = \inputs\relax
  \loop\ifnum\pgf@circ@res@count>0
    \advance\pgf@circ@res@temp by -\pgf@circ@res@step
      \pgfpathmoveto{\pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@temp}}%
    \pgfpathlineto{\pgfpoint
        {\pgfkeysvalueof{/tikz/circuitikz/tripoles/american nand port/port width}\pgf@circ@res@left}
        {\pgf@circ@res@temp}}
    \advance\pgf@circ@res@count by -1
  \repeat

    \pgfpathmoveto{\pgfpoint{\pgf@circ@res@right}{0pt}}
    \pgfpathlineto{\pgfpoint
        {\pgfkeysvalueof{/tikz/circuitikz/tripoles/american nand port/port width}\pgf@circ@res@right}
        {0pt}}

    \pgfusepath{draw}

    \pgfsetlinewidth{2\pgflinewidth}
    \pgf@circ@res@step = \pgfkeysvalueof{/tikz/circuitikz/tripoles/american nand port/circle width}\pgf@circ@res@right
    \pgf@circ@res@other = \pgfkeysvalueof{/tikz/circuitikz/tripoles/american nand port/port width}\pgf@circ@res@right
  \pgf@circ@res@temp = \dimexpr 2\pgf@circ@res@other - \pgf@circ@res@step\relax

    \pgfpathmoveto{\pgfpoint{-\pgf@circ@res@other}{\pgf@circ@res@up}}
    \pgfpathlineto{\pgfpoint{-\pgf@circ@res@other}{\pgf@circ@res@down}}
  \pgfpatharc{-90}{90}{\pgf@circ@res@temp and \pgf@circ@res@up}
  \pgfpathclose

    \pgfpathellipse
        {\pgfpoint{\pgf@circ@[email protected]\pgf@circ@res@step}{0pt}}
        {\pgfpoint{.5\pgf@circ@res@step}{0pt}}
        {\pgfpoint{0pt}{.5\pgf@circ@res@step}}

    \pgfusepath{draw}
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% nor %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\pgfcircdeclarelogicport{nor}{
  \edef\pgf@circ@math@angle{\pgfkeysvalueof{/tikz/circuitikz/tripoles/american nor port/angle}}%
  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american nor port/inner}\pgf@circ@res@right
  \pgfmathsetlengthmacro{\pgf@circ@math@xradius}{\pgf@circ@res@other /(1 - cos(\pgf@circ@math@angle)}%
  \pgfmathsetlengthmacro{\pgf@circ@math@yradius}{\pgf@circ@res@up /sin(\pgf@circ@math@angle)}%
  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american nor port/port width}\pgf@circ@res@right
  \pgfmathsetlengthmacro{\pgf@circ@math@xorigin}{\pgf@circ@res@other + \pgf@circ@math@xradius*cos(\pgf@circ@math@angle)}%

    \pgfextracty{\pgf@circ@res@temp}{\step}%
  \pgf@circ@res@step = \dimexpr 2\pgf@circ@res@temp -2\pgf@circ@res@up\relax
  \pgf@circ@res@count = \inputs\relax
  \loop\ifnum\pgf@circ@res@count>0
    \advance\pgf@circ@res@temp by -\pgf@circ@res@step
      \pgfpathmoveto{\pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@temp}}%
    \pgfmathsetmacro{\pgf@circ@math@angle}{asin(\pgf@circ@res@temp/\pgf@circ@math@yradius)}%
    \pgfmathsetlength{\pgf@circ@res@other}{\pgf@circ@math@xradius*cos(\pgf@circ@math@angle)-\pgf@circ@math@xorigin}%
    \pgfpathlineto{\pgfpoint{\pgf@circ@res@other}{\pgf@circ@res@temp}}%
    \advance\pgf@circ@res@count by -1
  \repeat

  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american nor port/port width}\pgf@circ@res@right
    \pgfpathmoveto{\pgfpoint{\pgf@circ@res@right}{0pt}}
    \pgfpathlineto{\pgfpoint{\pgf@circ@res@other}{0pt}}

  \pgfusepath{draw}

  \pgfsetlinewidth{2\pgflinewidth}

  \edef\pgf@circ@math@angle{\pgfkeysvalueof{/tikz/circuitikz/tripoles/american nor port/angle}}%
    \pgf@circ@res@step = \pgfkeysvalueof{/tikz/circuitikz/tripoles/american nor port/circle width}\pgf@circ@res@right
  \pgf@circ@res@temp = \dimexpr 2\pgf@circ@res@other - \pgf@circ@res@step\relax
  \advance\pgf@circ@res@other by -\pgf@circ@res@step

  \pgfpathmoveto{\pgfpoint{\pgf@circ@res@other}{0pt}}% for symmetry
  \pgfpatharc{0}{90}{\pgf@circ@res@temp and \pgf@circ@res@up}%
  \pgfpatharc{\pgf@circ@math@angle}{-\pgf@circ@math@angle}{\pgf@circ@math@xradius and \pgf@circ@math@yradius}%
  \pgfpatharc{-90}{0}{\pgf@circ@res@temp and \pgf@circ@res@up}%
  \pgfpathclose

    \pgfpathellipse
        {\pgfpoint{\pgf@circ@res@other+.5\pgf@circ@res@step}{0pt}}
        {\pgfpoint{.5\pgf@circ@res@step}{0pt}}
        {\pgfpoint{0pt}{.5\pgf@circ@res@step}}

    \pgfusepath{draw}
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% or %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\pgfcircdeclarelogicport{or}{
    \edef\pgf@circ@math@angle{\pgfkeysvalueof{/tikz/circuitikz/tripoles/american or port/angle}}%
  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american or port/inner}\pgf@circ@res@right
  \pgfmathsetlengthmacro{\pgf@circ@math@xradius}{\pgf@circ@res@other /(1 - cos(\pgf@circ@math@angle)}%
  \pgfmathsetlengthmacro{\pgf@circ@math@yradius}{\pgf@circ@res@up /sin(\pgf@circ@math@angle)}%
  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american or port/port width}\pgf@circ@res@right
  \pgfmathsetlengthmacro{\pgf@circ@math@xorigin}{\pgf@circ@res@other + \pgf@circ@math@xradius*cos(\pgf@circ@math@angle)}%

    \pgfextracty{\pgf@circ@res@temp}{\step}%
  \pgf@circ@res@step = \dimexpr 2\pgf@circ@res@temp -2\pgf@circ@res@up\relax
  \pgf@circ@res@count = \inputs\relax
  \loop\ifnum\pgf@circ@res@count>0
    \advance\pgf@circ@res@temp by -\pgf@circ@res@step
      \pgfpathmoveto{\pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@temp}}%
    \pgfmathsetmacro{\pgf@circ@math@angle}{asin(\pgf@circ@res@temp/\pgf@circ@math@yradius)}%
    \pgfmathsetlength{\pgf@circ@res@other}{\pgf@circ@math@xradius*cos(\pgf@circ@math@angle)-\pgf@circ@math@xorigin}%
    \pgfpathlineto{\pgfpoint{\pgf@circ@res@other}{\pgf@circ@res@temp}}%
    \advance\pgf@circ@res@count by -1
  \repeat

  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american or port/port width}\pgf@circ@res@right
    \pgfpathmoveto{\pgfpoint{\pgf@circ@res@right}{0pt}}
    \pgfpathlineto{\pgfpoint{\pgf@circ@res@other}{0pt}}

  \pgfusepath{draw}

  \pgfsetlinewidth{2\pgflinewidth}

  \edef\pgf@circ@math@angle{\pgfkeysvalueof{/tikz/circuitikz/tripoles/american or port/angle}}%

  \pgfpathmoveto{\pgfpoint{\pgf@circ@res@other}{0pt}}% for symmetry
  \pgfpatharc{0}{90}{2\pgf@circ@res@other and \pgf@circ@res@up}%
  \pgfpatharc{\pgf@circ@math@angle}{-\pgf@circ@math@angle}{\pgf@circ@math@xradius and \pgf@circ@math@yradius}%
  \pgfpatharc{-90}{0}{2\pgf@circ@res@other and \pgf@circ@res@up}%
  \pgfpathclose

    \pgfusepath{draw}
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% xor %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\pgfcircdeclarelogicport{xor}{
  \pgfkeysgetvalue{/tikz/circuitikz/tripoles/american xor port/angle}{\pgf@circ@math@angle}%
  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american xor port/inner}\pgf@circ@res@right
  \pgfmathsetlengthmacro{\pgf@circ@math@xradius}{\pgf@circ@res@other /(1 - cos(\pgf@circ@math@angle)}%
  \pgfmathsetlengthmacro{\pgf@circ@math@yradius}{\pgf@circ@res@up / sin(\pgf@circ@math@angle))}%
  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american xor port/port width}\pgf@circ@res@right
  \pgfmathsetlengthmacro{\pgf@circ@math@xorigin}{\pgf@circ@res@other + \pgf@circ@math@xradius*cos(\pgf@circ@math@angle)}%
  \pgf@circ@res@temp=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american xor port/distance}\pgf@circ@res@right
  \pgfmathsetlengthmacro{\pgf@circ@math@distance}{\pgf@circ@res@temp}
% this compensates for the effect of the line width on the gap between the arcs
  \pgfmathsetlengthmacro{\pgf@circ@math@yradiusA}{\pgf@circ@math@yradius -2\pgflinewidth}%
  \pgfmathsetlengthmacro{\pgf@circ@math@xradiusA}{\pgf@circ@math@xradius -2\pgflinewidth}%

    \pgfextracty{\pgf@circ@res@temp}{\step}%
  \pgf@circ@res@step = \dimexpr 2\pgf@circ@res@temp -2\pgf@circ@res@up\relax
  \pgf@circ@res@count = \inputs\relax
  \loop\ifnum\pgf@circ@res@count>0
    \advance\pgf@circ@res@temp by -\pgf@circ@res@step
      \pgfpathmoveto{\pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@temp}}%
    \pgfmathsetmacro{\pgf@circ@math@angle}{asin(\pgf@circ@res@temp  / \pgf@circ@math@yradiusA)}%
    \pgfmathsetlength{\pgf@circ@res@other}{\pgf@circ@math@xradiusA*cos(\pgf@circ@math@angle)-\pgf@circ@math@xorigin}%
    \advance\pgf@circ@res@other by -\pgf@circ@math@distance
    \pgfpathlineto{\pgfpoint{\pgf@circ@res@other}{\pgf@circ@res@temp}}%
    \advance\pgf@circ@res@count by -1
  \repeat

    \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american xor port/port width}\pgf@circ@res@right
    \pgfpathmoveto{\pgfpoint{\pgf@circ@res@right}{0pt}}
    \pgfpathlineto{\pgfpoint{\pgf@circ@res@other}{0pt}}

    \pgfusepath{draw}

  \pgfsetlinewidth{2\pgflinewidth}

  \edef\pgf@circ@math@angle{\pgfkeysvalueof{/tikz/circuitikz/tripoles/american xor port/angle}}%

  \pgfpathmoveto{\pgfpoint{\pgf@circ@res@other}{0pt}}% for symmetry
  \pgfpatharc{0}{90}{2\pgf@circ@res@other and \pgf@circ@res@up}%
  \pgfpatharc{\pgf@circ@math@angle}{-\pgf@circ@math@angle}{\pgf@circ@math@xradius and \pgf@circ@math@yradius}%
  \pgfpatharc{-90}{0}{2\pgf@circ@res@other and \pgf@circ@res@up}%
  \pgfpathclose

  \pgfmathsetlength{\pgf@circ@res@temp}{(\pgf@circ@math@yradiusA)*sin(\pgf@circ@math@angle)}%

  \pgfpathmoveto{\pgfpoint{-\pgf@circ@res@other-\pgf@circ@math@distance}{\pgf@circ@res@temp}}% first arc
  \pgfpatharc{\pgf@circ@math@angle}{-\pgf@circ@math@angle}{\pgf@circ@math@xradiusA and \pgf@circ@math@yradiusA}%

    \pgfusepath{draw}
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% xnor %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\pgfcircdeclarelogicport{xnor}{
  \pgfkeysgetvalue{/tikz/circuitikz/tripoles/american xnor port/angle}{\pgf@circ@math@angle}%
  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american xnor port/inner}\pgf@circ@res@right
  \pgfmathsetlengthmacro{\pgf@circ@math@xradius}{\pgf@circ@res@other /(1 - cos(\pgf@circ@math@angle)}%
  \pgfmathsetlengthmacro{\pgf@circ@math@yradius}{\pgf@circ@res@up / sin(\pgf@circ@math@angle))}%
  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american xnor port/port width}\pgf@circ@res@right
  \pgfmathsetlengthmacro{\pgf@circ@math@xorigin}{\pgf@circ@res@other + \pgf@circ@math@xradius*cos(\pgf@circ@math@angle)}%
  \pgf@circ@res@temp=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american xor port/distance}\pgf@circ@res@right
  \pgfmathsetlengthmacro{\pgf@circ@math@distance}{\pgf@circ@res@temp}
% this compensates for the effect of the line width on the gap between the arcs
  \pgfmathsetlengthmacro{\pgf@circ@math@yradiusA}{\pgf@circ@math@yradius -2\pgflinewidth}%
  \pgfmathsetlengthmacro{\pgf@circ@math@xradiusA}{\pgf@circ@math@xradius -2\pgflinewidth}%

    \pgfextracty{\pgf@circ@res@temp}{\step}%
  \pgf@circ@res@step = \dimexpr 2\pgf@circ@res@temp -2\pgf@circ@res@up\relax
  \pgf@circ@res@count = \inputs\relax
  \loop\ifnum\pgf@circ@res@count>0
    \advance\pgf@circ@res@temp by -\pgf@circ@res@step
      \pgfpathmoveto{\pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@temp}}%
    \pgfmathsetmacro{\pgf@circ@math@angle}{asin(\pgf@circ@res@temp  / \pgf@circ@math@yradiusA)}%
    \pgfmathsetlength{\pgf@circ@res@other}{\pgf@circ@math@xradiusA*cos(\pgf@circ@math@angle)-\pgf@circ@math@xorigin}%
    \advance\pgf@circ@res@other by -\pgf@circ@math@distance
    \pgfpathlineto{\pgfpoint{\pgf@circ@res@other}{\pgf@circ@res@temp}}%
    \advance\pgf@circ@res@count by -1
  \repeat

    \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american xnor port/port width}\pgf@circ@res@right
    \pgfpathmoveto{\pgfpoint{\pgf@circ@res@right}{0pt}}
    \pgfpathlineto{\pgfpoint{\pgf@circ@res@other}{0pt}}

    \pgfusepath{draw}

  \pgfsetlinewidth{2\pgflinewidth}

  \edef\pgf@circ@math@angle{\pgfkeysvalueof{/tikz/circuitikz/tripoles/american xnor port/angle}}%
  \pgf@circ@res@step = \pgfkeysvalueof{/tikz/circuitikz/tripoles/american xnor port/circle width}\pgf@circ@res@right
  \pgf@circ@res@temp = \dimexpr 2\pgf@circ@res@other - \pgf@circ@res@step\relax
  \advance\pgf@circ@res@other by -\pgf@circ@res@step

  \pgfpathmoveto{\pgfpoint{\pgf@circ@res@other}{0pt}}% for symmetry
  \pgfpatharc{0}{90}{\pgf@circ@res@temp and \pgf@circ@res@up}%
  \pgfpatharc{\pgf@circ@math@angle}{-\pgf@circ@math@angle}{\pgf@circ@math@xradius and \pgf@circ@math@yradius}%
  \pgfpatharc{-90}{0}{\pgf@circ@res@temp and \pgf@circ@res@up}%
  \pgfpathclose

    \pgfpathellipse
        {\pgfpoint{\pgf@circ@res@other+.5\pgf@circ@res@step}{0pt}}
        {\pgfpoint{.5\pgf@circ@res@step}{0pt}}
        {\pgfpoint{0pt}{.5\pgf@circ@res@step}}

  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american xnor port/port width}\pgf@circ@res@left
  \pgfmathsetlength{\pgf@circ@res@temp}{(\pgf@circ@math@yradiusA)*sin(\pgf@circ@math@angle)}%

  \pgfpathmoveto{\pgfpoint{\pgf@circ@res@other-\pgf@circ@math@distance}{\pgf@circ@res@temp}}% first arc
  \pgfpatharc{\pgf@circ@math@angle}{-\pgf@circ@math@angle}{\pgf@circ@math@xradiusA and \pgf@circ@math@yradiusA}%

    \pgfusepath{draw}
}
\makeatother
\begin{document}
\begin{circuitikz}
\node[american and port] at (0,0) {};
\node[american nand port,number inputs=3] at (0,-2) {};
\node[american or port,number inputs=4] at (2,0) {};
\node[american nor port,number inputs=5] at (2,-2) {};
\node[american xor port,number inputs=6] at (4,0) {};
\node[american xnor port,number inputs=7] at (4,-2) {};
\end{circuitikz}
\end{document}

bettergates.tex

\documentclass[border=1mm]{standalone}
\usepackage{circuitikz}

\ctikzset{tripoles/american and port/width/.initial=1.4}
\ctikzset{tripoles/american or port/width/.initial=1.4}
\ctikzset{tripoles/american xor port/width/.initial=1.4}
% not sure how this relates to shape behavior

\ctikzset{tripoles/american and port/origin/.initial=0.8}
\ctikzset{tripoles/american and port/inputs/.initial=2}

\ctikzset{tripoles/american nand port/origin/.initial=0.8}
\ctikzset{tripoles/american nand port/inputs/.initial=2}

\ctikzset{tripoles/american nor port/origin/.initial=0.8}
\ctikzset{tripoles/american nor port/inputs/.initial=2}
\ctikzset{tripoles/american nor port/angle/.initial=70}
\ctikzset{tripoles/american nor port/inner/.initial=0.3}

\ctikzset{tripoles/american or port/origin/.initial=0.8}
\ctikzset{tripoles/american or port/inputs/.initial=2}
\ctikzset{tripoles/american or port/angle/.initial=60}  %% changed
\ctikzset{tripoles/american or port/inner/.initial=0.3}

\ctikzset{tripoles/american xor port/origin/.initial=0.8}
\ctikzset{tripoles/american xor port/inputs/.initial=2}
\ctikzset{tripoles/american xor port/angle/.initial=60} %% changed
\ctikzset{tripoles/american xor port/inner/.initial=0.3}

\ctikzset{tripoles/american xnor port/origin/.initial=0.8}
\ctikzset{tripoles/american xnor port/inputs/.initial=2}
\ctikzset{tripoles/american xnor port/angle/.initial=70}
\ctikzset{tripoles/american xnor port/inner/.initial=0.3}

\pgfkeys{/tikz/number inputs/.initial=0}
\pgfkeys{/tikz/number inputs/.default=0}

\makeatletter
\newcount{\pgf@circ@res@count}% reserve global register
\newdimen\pgf@circ@res@horz % horizontal point
\newdimen\pgf@circ@res@horzb % horizontal point
\newdimen\pgf@circ@res@horzc % horizontal point

\newcommand{\pgf@circ@logicportANSI@input}[1]% #1 = \pgfmathcounter
{%
  \pgfextracty{\pgf@circ@res@up}{\northeast}%
  \step
  \pgf@circ@res@step=\dimexpr 2\pgf@y -2\pgf@circ@res@up\relax
  \advance\pgf@y by -#1\pgf@circ@res@step\relax
}%
\long\def\pgfcircdeclarelogicportANSI#1#2{%
    \pgfdeclareshape{american #1 port}%
    {%
    \savedmacro\resize{% automatic
      \pgf@circ@res@up = \pgfkeysvalueof{/tikz/circuitikz/tripoles/american #1 port/height}\pgf@circ@Rlen
      \pgf@circ@res@up = .5\pgf@circ@res@up
      \pgf@circ@res@down = -\pgf@circ@res@up
      \pgf@circ@res@right = \pgfkeysvalueof{/tikz/circuitikz/tripoles/american #1 port/width}\pgf@circ@Rlen
      \pgf@circ@res@right = .5\pgf@circ@res@right
      \pgf@circ@res@left = -\pgf@circ@res@right
    }%
    \savedmacro\inputs{% get number of inputs
      \pgf@circ@res@count=\pgfkeysvalueof{/tikz/number inputs}\relax%
      \ifnum\pgf@circ@res@count=0
        \pgf@circ@res@count=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american #1 port/inputs}\relax%
      \fi
      \ifnum\pgf@circ@res@count<2 \pgf@circ@res@count=2\fi
      \ifnum\pgf@circ@res@count>16 \pgf@circ@res@count=16\fi
      \def\inputs{\the\pgf@circ@res@count}%
    }%
    \savedanchor\step{% 1/2 gap at edges
      \pgf@circ@res@step = \pgfkeysvalueof{/tikz/circuitikz/tripoles/american #1 port/height}\pgf@circ@Rlen
      \divide\pgf@circ@res@step by \pgf@circ@res@count
      \pgfpoint{\pgf@circ@res@left}{\dimexpr\pgf@circ@res@up+0.5\pgf@circ@res@step}%
    }%
      \savedanchor\northeast{\pgfpoint{\pgf@circ@res@right}{\pgf@circ@res@up}}
    \savedanchor\southwest{\pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@down}}
    \savedanchor\left{\pgfpoint{\pgfkeysvalueof{/tikz/circuitikz/tripoles/american #1 port/port width}\pgf@circ@res@left}{0pt}}
    \savedanchor\right{\pgfpoint{\pgfkeysvalueof{/tikz/circuitikz/tripoles/american #1 port/port width}\pgf@circ@res@right}{0pt}}
    \savedanchor\origin{\pgfpoint{\pgfkeysvalueof{/tikz/circuitikz/tripoles/american #1 port/origin}\pgf@circ@res@right}{0pt}}

    \anchor{center}{\origin}% for backwards compatibility
    \anchor{text}{\pgfpoint{-.5\wd\pgfnodeparttextbox}{\dimexpr.5\dp\pgfnodeparttextbox-.5\ht\pgfnodeparttextbox}}

% create input anchors
    \expandafter\pgfutil@g@addto@macro\csname pgf@sh@s@american #1 port\endcsname{%
      \pgfmathloop%
      \ifnum\pgfmathcounter>\pgf@circ@res@count%
      \else%
        %\pgfutil@ifundefined{pgf@anchor@american #1 port@in \pgfmathcounter}{%
          \expandafter\xdef\csname pgf@anchor@american #1 port@in \pgfmathcounter\endcsname{%
            \noexpand\pgf@circ@logicportANSI@input{\pgfmathcounter}% defined above
          }%
        %}{}%
      \repeatpgfmathloop%
    }

   % why does commenting this out still work?
      %\anchor{out}{\pgfpoint{\pgf@circ@res@right}{0pt}}

    \anchor{left}{\left}% edges of component mius leads
    \anchor{right}{\right}

    \anchor{north east}{\northeast}% see \Compass macro
    \anchor{south west}{\southwest}
    \anchor{north}{\pgfextracty{\pgf@circ@res@up}{\northeast}%
      \pgfpoint{0cm}{\pgf@circ@res@up}}
    \anchor{north west}{\pgfextracty{\pgf@circ@res@up}{\northeast}%
      \pgfextractx{\pgf@circ@res@left}{\southwest}%
      \pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@up}}
    \anchor{west}{\pgfextractx{\pgf@circ@res@left}{\sosuthwest}%
      \pgfpoint{\pgf@circ@res@left}{0cm}}
    \anchor{south}{\pgfextracty{\pgf@circ@res@down}{\southwest}%
      \pgfpoint{0cm}{\pgf@circ@res@down}}
    \anchor{south east}{\pgfextracty{\pgf@circ@res@down}{\southwest}%
      \pgfextractx{\pgf@circ@res@right}{\northeast}%
      \pgfpoint{\pgf@circ@res@right}{\pgf@circ@res@down}}
    \anchor{east}{\pgfextractx{\pgf@circ@res@right}{\northeast}%
      \pgfpoint{\pgf@circ@res@right}{0cm}}

      \backgroundpath{          
            \pgfsetcolor{\pgfkeysvalueof{/tikz/circuitikz/color}}   
            #2
      }
    }
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% and %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\pgfcircdeclarelogicportANSI{and}{
  \pgfextracty{\pgf@circ@res@temp}{\step}%
  \pgf@circ@res@step = \dimexpr 2\pgf@circ@res@temp -2\pgf@circ@res@up\relax
  \pgf@circ@res@count = \inputs\relax
  \loop\ifnum\pgf@circ@res@count>0
    \advance\pgf@circ@res@temp by -\pgf@circ@res@step
      \pgfpathmoveto{\pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@temp}}%
    \pgfpathlineto{\pgfpoint
        {\pgfkeysvalueof{/tikz/circuitikz/tripoles/american and port/port width}\pgf@circ@res@left}
        {\pgf@circ@res@temp}}
    \advance\pgf@circ@res@count by -1
  \repeat

    \pgfpathmoveto{\pgfpoint{\pgf@circ@res@right}{0pt}}
    \pgfpathlineto{\pgfpoint
        {\pgfkeysvalueof{/tikz/circuitikz/tripoles/american and port/port width}\pgf@circ@res@right}
        {0pt}}

    \pgfusepath{draw}

    \pgfsetlinewidth{2\pgflinewidth}
  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american and port/port width}\pgf@circ@res@left
  \pgf@circ@res@horz=\dimexpr\pgf@circ@res@other+1.4615\pgf@circ@res@up
  % 19:26 ratio of width:height
  
    \pgfpathmoveto{\pgfpoint{\pgf@circ@res@other}{\pgf@circ@res@up}}
  \pgfpathlineto{\pgfpoint{\pgf@circ@res@other}{\pgf@circ@res@down}}
  \pgfpathlineto{\pgfpoint{\pgf@circ@res@horz}{\pgf@circ@res@down}}
  \pgfpatharc{-90}{90}{\pgf@circ@res@up}
  \pgfpathclose
    \pgfusepath{draw}
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% nand %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\pgfcircdeclarelogicportANSI{nand}{
    \pgfextracty{\pgf@circ@res@temp}{\step}%
  \pgf@circ@res@step = \dimexpr 2\pgf@circ@res@temp -2\pgf@circ@res@up\relax
  \pgf@circ@res@count = \inputs\relax
  \loop\ifnum\pgf@circ@res@count>0
    \advance\pgf@circ@res@temp by -\pgf@circ@res@step
      \pgfpathmoveto{\pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@temp}}%
    \pgfpathlineto{\pgfpoint
        {\pgfkeysvalueof{/tikz/circuitikz/tripoles/american nand port/port width}\pgf@circ@res@left}
        {\pgf@circ@res@temp}}
    \advance\pgf@circ@res@count by -1
  \repeat

    \pgfpathmoveto{\pgfpoint{\pgf@circ@res@right}{0pt}}
    \pgfpathlineto{\pgfpoint
        {\pgfkeysvalueof{/tikz/circuitikz/tripoles/american nand port/port width}\pgf@circ@res@right}
        {0pt}}

    \pgfusepath{draw}

    \pgfsetlinewidth{2\pgflinewidth}
    \pgf@circ@res@step = \pgfkeysvalueof{/tikz/circuitikz/tripoles/american nand port/circle width}\pgf@circ@res@right
    \pgf@circ@res@other = \pgfkeysvalueof{/tikz/circuitikz/tripoles/american nand port/port width}\pgf@circ@res@right
  \pgf@circ@res@temp = \dimexpr 2\pgf@circ@res@other - \pgf@circ@res@step\relax

    \pgfpathmoveto{\pgfpoint{-\pgf@circ@res@other}{\pgf@circ@res@up}}
    \pgfpathlineto{\pgfpoint{-\pgf@circ@res@other}{\pgf@circ@res@down}}
  \pgfpatharc{-90}{90}{\pgf@circ@res@temp and \pgf@circ@res@up}
  \pgfpathclose

    \pgfpathellipse
        {\pgfpoint{\pgf@circ@[email protected]\pgf@circ@res@step}{0pt}}
        {\pgfpoint{.5\pgf@circ@res@step}{0pt}}
        {\pgfpoint{0pt}{.5\pgf@circ@res@step}}

    \pgfusepath{draw}
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% nor %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\pgfcircdeclarelogicportANSI{nor}{
  \edef\pgf@circ@math@angle{\pgfkeysvalueof{/tikz/circuitikz/tripoles/american nor port/angle}}%
  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american nor port/inner}\pgf@circ@res@right
  \pgfmathsetlengthmacro{\pgf@circ@math@xradius}{\pgf@circ@res@other /(1 - cos(\pgf@circ@math@angle)}%
  \pgfmathsetlengthmacro{\pgf@circ@math@yradius}{\pgf@circ@res@up /sin(\pgf@circ@math@angle)}%
  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american nor port/port width}\pgf@circ@res@right
  \pgfmathsetlengthmacro{\pgf@circ@math@xorigin}{\pgf@circ@res@other + \pgf@circ@math@xradius*cos(\pgf@circ@math@angle)}%

    \pgfextracty{\pgf@circ@res@temp}{\step}%
  \pgf@circ@res@step = \dimexpr 2\pgf@circ@res@temp -2\pgf@circ@res@up\relax
  \pgf@circ@res@count = \inputs\relax
  \loop\ifnum\pgf@circ@res@count>0
    \advance\pgf@circ@res@temp by -\pgf@circ@res@step
      \pgfpathmoveto{\pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@temp}}%
    \pgfmathsetmacro{\pgf@circ@math@angle}{asin(\pgf@circ@res@temp/\pgf@circ@math@yradius)}%
    \pgfmathsetlength{\pgf@circ@res@other}{\pgf@circ@math@xradius*cos(\pgf@circ@math@angle)-\pgf@circ@math@xorigin}%
    \pgfpathlineto{\pgfpoint{\pgf@circ@res@other}{\pgf@circ@res@temp}}%
    \advance\pgf@circ@res@count by -1
  \repeat

  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american nor port/port width}\pgf@circ@res@right
    \pgfpathmoveto{\pgfpoint{\pgf@circ@res@right}{0pt}}
    \pgfpathlineto{\pgfpoint{\pgf@circ@res@other}{0pt}}

  \pgfusepath{draw}

  \pgfsetlinewidth{2\pgflinewidth}

  \edef\pgf@circ@math@angle{\pgfkeysvalueof{/tikz/circuitikz/tripoles/american nor port/angle}}%
    \pgf@circ@res@step = \pgfkeysvalueof{/tikz/circuitikz/tripoles/american nor port/circle width}\pgf@circ@res@right
  \pgf@circ@res@temp = \dimexpr 2\pgf@circ@res@other - \pgf@circ@res@step\relax
  \advance\pgf@circ@res@other by -\pgf@circ@res@step

  \pgfpathmoveto{\pgfpoint{\pgf@circ@res@other}{0pt}}% for symmetry
  \pgfpatharc{0}{90}{\pgf@circ@res@temp and \pgf@circ@res@up}%
  \pgfpatharc{\pgf@circ@math@angle}{-\pgf@circ@math@angle}{\pgf@circ@math@xradius and \pgf@circ@math@yradius}%
  \pgfpatharc{-90}{0}{\pgf@circ@res@temp and \pgf@circ@res@up}%
  \pgfpathclose

    \pgfpathellipse
        {\pgfpoint{\pgf@circ@res@other+.5\pgf@circ@res@step}{0pt}}
        {\pgfpoint{.5\pgf@circ@res@step}{0pt}}
        {\pgfpoint{0pt}{.5\pgf@circ@res@step}}

    \pgfusepath{draw}
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% or %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\pgfcircdeclarelogicportANSI{or}{
    \edef\pgf@circ@math@angle{\pgfkeysvalueof{/tikz/circuitikz/tripoles/american or port/angle}}%
  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american or port/inner}\pgf@circ@res@right
  \pgfmathsetlengthmacro{\pgf@circ@math@xradius}{2\pgf@circ@res@up}%
  \pgfmathsetlengthmacro{\pgf@circ@math@yradius}{2\pgf@circ@res@up}%
  \pgf@circ@res@other=1.22\pgf@circ@res@right
  %% not sure how to compute the right number
  \pgfmathsetlengthmacro{\pgf@circ@math@xorigin}{\pgf@circ@res@other + \pgf@circ@math@xradius*cos(\pgf@circ@math@angle)}%

    \pgfextracty{\pgf@circ@res@temp}{\step}%
  \pgf@circ@res@step = \dimexpr 2\pgf@circ@res@temp -2\pgf@circ@res@up\relax
  \pgf@circ@res@count = \inputs\relax
  \loop\ifnum\pgf@circ@res@count>0
    \advance\pgf@circ@res@temp by -\pgf@circ@res@step
      \pgfpathmoveto{\pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@temp}}%
    \pgfmathsetmacro{\pgf@circ@math@angle}{asin(\pgf@circ@res@temp/\pgf@circ@math@yradius)}%
    \pgfmathsetlength{\pgf@circ@res@other}{\pgf@circ@math@xradius*cos(\pgf@circ@math@angle)-\pgf@circ@math@xorigin}%
    \pgfpathlineto{\pgfpoint{\pgf@circ@res@other}{\pgf@circ@res@temp}}%
    \advance\pgf@circ@res@count by -1
  \repeat

  % help! not sure how to compute this
  \pgf@circ@res@other=0.75\pgf@circ@res@right
  \pgf@circ@res@horz=\dimexpr\pgf@circ@res@other - 1.732\pgf@circ@res@up
  \pgf@circ@res@horzb=\dimexpr\pgf@circ@res@other - 2.732\pgf@circ@res@up
  % 1:2 ratio of width:height
    \pgfpathmoveto{\pgfpoint{\pgf@circ@res@right}{0pt}}
    \pgfpathlineto{\pgfpoint{\pgf@circ@res@other}{0pt}}

  \pgfusepath{draw}

  \pgfsetlinewidth{2\pgflinewidth}

  \edef\pgf@circ@math@angle{\pgfkeysvalueof{/tikz/circuitikz/tripoles/american or port/angle}}%

  \pgfpathmoveto{\pgfpoint{\pgf@circ@res@other}{0pt}}% for symmetry
  \pgfpatharc{30}{90}{2\pgf@circ@res@up}%
  \pgfpathlineto{\pgfpoint{\pgf@circ@res@horzb}{\pgf@circ@res@up}}
  \pgfpatharc{30}{-30}{2\pgf@circ@res@up}%
  \pgfpathlineto{\pgfpoint{\pgf@circ@res@horz}{\pgf@circ@res@down}}
  \pgfpatharc{-90}{-30}{2\pgf@circ@res@up}%
  \pgfpathclose

    \pgfusepath{draw}
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% xor %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\pgfcircdeclarelogicportANSI{xor}{
  \pgfkeysgetvalue{/tikz/circuitikz/tripoles/american xor port/angle}{\pgf@circ@math@angle}%
  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american xor port/inner}\pgf@circ@res@right
  \pgfmathsetlengthmacro{\pgf@circ@math@xradius}{2\pgf@circ@res@up}%
  \pgfmathsetlengthmacro{\pgf@circ@math@yradius}{2\pgf@circ@res@up}%
  \pgf@circ@res@other=1.11\pgf@circ@res@right
  %% not sure how to compute the right number
  \pgfmathsetlengthmacro{\pgf@circ@math@xorigin}{\pgf@circ@res@other + \pgf@circ@math@xradius*cos(\pgf@circ@math@angle)}%
  \pgf@circ@res@temp=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american xor port/distance}\pgf@circ@res@right
  \pgfmathsetlengthmacro{\pgf@circ@math@distance}{\pgf@circ@res@temp}
% this compensates for the effect of the line width on the gap between the arcs
  \pgfmathsetlengthmacro{\pgf@circ@math@yradiusA}{\pgf@circ@math@yradius -2\pgflinewidth}%
  \pgfmathsetlengthmacro{\pgf@circ@math@xradiusA}{\pgf@circ@math@xradius -2\pgflinewidth}%

    \pgfextracty{\pgf@circ@res@temp}{\step}%
  \pgf@circ@res@step = \dimexpr 2\pgf@circ@res@temp -2\pgf@circ@res@up\relax
  \pgf@circ@res@count = \inputs\relax
  \loop\ifnum\pgf@circ@res@count>0
    \advance\pgf@circ@res@temp by -\pgf@circ@res@step
      \pgfpathmoveto{\pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@temp}}%
    \pgfmathsetmacro{\pgf@circ@math@angle}{asin(\pgf@circ@res@temp  / \pgf@circ@math@yradiusA)}%
    \pgfmathsetlength{\pgf@circ@res@other}{\pgf@circ@math@xradiusA*cos(\pgf@circ@math@angle)-\pgf@circ@math@xorigin}%
    \advance\pgf@circ@res@other by -\pgf@circ@math@distance
    \pgfpathlineto{\pgfpoint{\pgf@circ@res@other}{\pgf@circ@res@temp}}%
    \advance\pgf@circ@res@count by -1
  \repeat

  % help! not sure how to compute this
  \pgf@circ@res@other=0.75\pgf@circ@res@right
  \pgf@circ@res@horz=\dimexpr\pgf@circ@res@other - 1.732\pgf@circ@res@up
  \pgf@circ@res@horzb=\dimexpr\pgf@circ@res@other - 2.732\pgf@circ@res@up
  % 1:2 ratio of width:height
  \pgf@circ@res@horzc=\dimexpr\pgf@circ@res@other - 3.116\pgf@circ@res@up
  % 5/26 ratio of xor gap: height
    \pgfpathmoveto{\pgfpoint{\pgf@circ@res@right}{0pt}}
    \pgfpathlineto{\pgfpoint{\pgf@circ@res@other}{0pt}}

    \pgfusepath{draw}

  \pgfsetlinewidth{2\pgflinewidth}

  \edef\pgf@circ@math@angle{\pgfkeysvalueof{/tikz/circuitikz/tripoles/american xor port/angle}}%

  \pgfpathmoveto{\pgfpoint{\pgf@circ@res@other}{0pt}}% for symmetry
  \pgfpatharc{30}{90}{2\pgf@circ@res@up}%
  \pgfpathlineto{\pgfpoint{\pgf@circ@res@horzb}{\pgf@circ@res@up}}
  \pgfpatharc{30}{-30}{2\pgf@circ@res@up}%
  \pgfpathlineto{\pgfpoint{\pgf@circ@res@horz}{\pgf@circ@res@down}}
  \pgfpatharc{-90}{-30}{2\pgf@circ@res@up}%
  \pgfpathclose
  
  \pgfpathmoveto{\pgfpoint{\pgf@circ@res@horzc}{\pgf@circ@res@up}}
  \pgfpatharc{30}{-30}{2\pgf@circ@res@up}%

    \pgfusepath{draw}
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% xnor %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\pgfcircdeclarelogicportANSI{xnor}{
  \pgfkeysgetvalue{/tikz/circuitikz/tripoles/american xnor port/angle}{\pgf@circ@math@angle}%
  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american xnor port/inner}\pgf@circ@res@right
  \pgfmathsetlengthmacro{\pgf@circ@math@xradius}{\pgf@circ@res@other /(1 - cos(\pgf@circ@math@angle)}%
  \pgfmathsetlengthmacro{\pgf@circ@math@yradius}{\pgf@circ@res@up / sin(\pgf@circ@math@angle))}%
  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american xnor port/port width}\pgf@circ@res@right
  \pgfmathsetlengthmacro{\pgf@circ@math@xorigin}{\pgf@circ@res@other + \pgf@circ@math@xradius*cos(\pgf@circ@math@angle)}%
  \pgf@circ@res@temp=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american xor port/distance}\pgf@circ@res@right
  \pgfmathsetlengthmacro{\pgf@circ@math@distance}{\pgf@circ@res@temp}
% this compensates for the effect of the line width on the gap between the arcs
  \pgfmathsetlengthmacro{\pgf@circ@math@yradiusA}{\pgf@circ@math@yradius -2\pgflinewidth}%
  \pgfmathsetlengthmacro{\pgf@circ@math@xradiusA}{\pgf@circ@math@xradius -2\pgflinewidth}%

    \pgfextracty{\pgf@circ@res@temp}{\step}%
  \pgf@circ@res@step = \dimexpr 2\pgf@circ@res@temp -2\pgf@circ@res@up\relax
  \pgf@circ@res@count = \inputs\relax
  \loop\ifnum\pgf@circ@res@count>0
    \advance\pgf@circ@res@temp by -\pgf@circ@res@step
      \pgfpathmoveto{\pgfpoint{\pgf@circ@res@left}{\pgf@circ@res@temp}}%
    \pgfmathsetmacro{\pgf@circ@math@angle}{asin(\pgf@circ@res@temp  / \pgf@circ@math@yradiusA)}%
    \pgfmathsetlength{\pgf@circ@res@other}{\pgf@circ@math@xradiusA*cos(\pgf@circ@math@angle)-\pgf@circ@math@xorigin}%
    \advance\pgf@circ@res@other by -\pgf@circ@math@distance
    \pgfpathlineto{\pgfpoint{\pgf@circ@res@other}{\pgf@circ@res@temp}}%
    \advance\pgf@circ@res@count by -1
  \repeat

    \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american xnor port/port width}\pgf@circ@res@right
    \pgfpathmoveto{\pgfpoint{\pgf@circ@res@right}{0pt}}
    \pgfpathlineto{\pgfpoint{\pgf@circ@res@other}{0pt}}

    \pgfusepath{draw}

  \pgfsetlinewidth{2\pgflinewidth}

  \edef\pgf@circ@math@angle{\pgfkeysvalueof{/tikz/circuitikz/tripoles/american xnor port/angle}}%
  \pgf@circ@res@step = \pgfkeysvalueof{/tikz/circuitikz/tripoles/american xnor port/circle width}\pgf@circ@res@right
  \pgf@circ@res@temp = \dimexpr 2\pgf@circ@res@other - \pgf@circ@res@step\relax
  \advance\pgf@circ@res@other by -\pgf@circ@res@step

  \pgfpathmoveto{\pgfpoint{\pgf@circ@res@other}{0pt}}% for symmetry
  \pgfpatharc{0}{90}{\pgf@circ@res@temp and \pgf@circ@res@up}%
  \pgfpatharc{\pgf@circ@math@angle}{-\pgf@circ@math@angle}{\pgf@circ@math@xradius and \pgf@circ@math@yradius}%
  \pgfpatharc{-90}{0}{\pgf@circ@res@temp and \pgf@circ@res@up}%
  \pgfpathclose

    \pgfpathellipse
        {\pgfpoint{\pgf@circ@res@other+.5\pgf@circ@res@step}{0pt}}
        {\pgfpoint{.5\pgf@circ@res@step}{0pt}}
        {\pgfpoint{0pt}{.5\pgf@circ@res@step}}

  \pgf@circ@res@other=\pgfkeysvalueof{/tikz/circuitikz/tripoles/american xnor port/port width}\pgf@circ@res@left
  \pgfmathsetlength{\pgf@circ@res@temp}{(\pgf@circ@math@yradiusA)*sin(\pgf@circ@math@angle)}%

  \pgfpathmoveto{\pgfpoint{\pgf@circ@res@other-\pgf@circ@math@distance}{\pgf@circ@res@temp}}% first arc
  \pgfpatharc{\pgf@circ@math@angle}{-\pgf@circ@math@angle}{\pgf@circ@math@xradiusA and \pgf@circ@math@yradiusA}%

    \pgfusepath{draw}
}
\makeatother
\begin{document}
\begin{circuitikz}
\node[american and port] (U1) at (0,0) {\sffamily U1};
\node[american or port] (U2) at (0,1.5) {\sffamily U2};
\node[american xor port] (U3) at (0,3) {\sffamily U3};

\node[american or port,number inputs=4] at (2,0) {};
\node[american xor port,number inputs=6] at (4,0) {};

\node[] at (0,-1) {\sffamily Circuitikz 1.0.2:};
\node[american nand port,number inputs=3] at (0,-2) {};
\node[american nor port,number inputs=5] at (2,-2) {};
\node[american xnor port,number inputs=7] at (4,-2) {};

\draw[-, red] (U1.out) -- (U2.in 1);
\draw[-, red] (U2.out) -- (U3.in 1);
\draw[-, red] (U3.out) -- (U1.in 1);

\end{circuitikz}
\end{document}