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DC analog signal

maduba

New Member
Hi,

I would like a advice on how to filter out the DC analog signal that comes out from analog multiplexer. It contains noice kind of spike. I very much appreciated if you could reply me back soon as possible. Thank you
 

danadak

Active Member
A cap in series with output will remove DC.

Do you have a scope capoture of spike waveform ? If its real
narrow a LPF sill help remove it. But what is signal into mux,
range of frequencies ? Can you show a scope capture of normal
signal with spike ?

1646695336808.png

So a series cap with above low pass filter, at ist input, will remove DC.
The filter the spike.....



Regards, Dana.
 

rjenkinsgb

Well-Known Member
Most Helpful Member
The simplest way to eliminate switching spikes or glitches is to bias all the signals to the same DC level around the multiplexer.

eg. This is an example I did for another user, but the exact same principle applies with a multiplexer; consider the three switches as a three way multiplexer & adjust the number of input bias caps and resistors to suit.


Analog_Switch_Bias.jpg
 

danadak

Active Member
Some considerations in using analog switches and causes of transients -




Regards, Dana.
 

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