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@ericfont

ericfont/circuit-20251125-2031.svg

Created November 26, 2025 01:29
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low-pole-then-high-pole-directly-into-opamp-inputs
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circuit-20251125-2031.svg
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@ericfont
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ericfont commented Nov 26, 2025

sim

not great:
image
image

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ericfont commented Nov 26, 2025

another attempt, but without schmitt

circuit-20251125-2035

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ericfont commented Nov 26, 2025

lower freq to around 150kHz:

circuit-20251125-2040

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ericfont commented Nov 26, 2025

another variation, followed by 1Mhz cutoff

circuit-20251125-2045

image

Too much noise:
image

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ericfont commented Nov 26, 2025

same but without 1Mhz RC after opamp...much higher oscillation around 500kHz instead of 150kHz:

image

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ericfont commented Nov 26, 2025

raise opamp output pole to 5MHz
circuit-20251125-2058
not great:

image

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ericfont commented Nov 26, 2025

sim

circuit-20251126-1219

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ericfont commented Nov 26, 2025

image

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