Re: Analog switch click... Will a low pass filter smooth it out?

John O'Flaherty wrote:
No. The discontinuity isn't just or mainly at high frequencies. Your
waveforms show a 200 mV (if I'm reading it right) DC shift between the
two waveforms. No low pass filter can help that. Balancing the average
level of the original input and the filter op amp output might help.
You might want to look at what's happening with no signal going in at
all, and make sure everything is balanced so no DC shift occurs when
you switch.


Hi John,

Great suggestion. I'll try that out soon. The last time I tried
something similar I actually did notice a DC level shift at the output
eventhough the output was AC coupled using a 1uF capacitor. However,
this was using the inverting configuration. I'll try it out again using
the attenuator.

I was actually interpreting the waveform shift as due to the attenuator
circuit decreasing the amplitude, but then again I could be wrong. I
think I can verify this with your suggestion.

Thanks!
P.

.

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