LISO simulation of some anti-aliasing filters

aafilternew.fil

# Description: AAFILTERNEW
# File: AAFilterNew
# Revision: 2011-10-25

r r6 5.11k nin na1
r r7 5.11k na1 nb1
c c12 2.2n nb1 gnd 
c c16 6.8n na1 nout1
op n4a lt1124 nb1 nout1 nout1

r r8  4.42k nout1 na2
r r9  21.5k na2   nb2
r r10 9.53k nb2   nc2
c c13 100p  nc2   gnd
c c14 6.8n  na2   gnd
c c15 10n   nb2   nout2
op n4b lt1124 nc2 nout2 nout2

factor 1
uinput nin 0
freq log 1 100k 100
uoutput nout2:db:deg

ligoaa.fil

# 3rd order kHz low-pass filter

r r4 1k   n5 n1
r r8 1k   n6 n2

c c6 24n  n1 n2

r r5 1k   n1 n3
r r7 1k   n2 n4

r r1 1k   n1 n10  
r r13 1k  n2 n15
c c1 4.7n n3 n10
c c9 4.7n n4 n15

op u1 op27 n4 n3 n10

# Inverter stage

r  rdummy1 100 n10 ndummy
r  rdummy2 100 ndummy n15
op opdummy op27 gnd ndummy n15


# Notch at 65536 Hz

r r2  100 n10 n11
r r3  100 n11 n12
r r6  100 n12 n19
r r9  100 n13 n16
r r10 100 n17 n18
r r11 100 n15 n14
r r12 100 n14 n17

c c3  24n n11 n14
c c4  24n n10 n13
c c5  24n n13 n12
c c10 24n n15 n16
c c11 24n n16 n17
c c7  24n n18 n19

# Output stage

factor 2
freq log 1 100k 100
uinput n5 n6 0
uoutput n19:db:deg