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

 

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

Start by showing us a circuit diagram of what you have, showing all part numbers and component values.

 

To block DC, you can run the signal through a series capacitor.

Spikes are a different issue.

 

You said "noice" but we spell it "noise".
A signal spike in music might be part of the music. If somebody is speaking the spike might be a cough.

Years ago a scratch on a vinyl record produced a large spike that was reduced by a pop-reduction circuit.
Why does your analog multiplexer produce a large spike?

 

If the noise spike occurs when the mux is switching channels, that's the capacitive feedthrough from the gate control signal to the signal channel.

That can possibly be reduced by filtering or reducing the signal source and/or load impedance.

Using a MUX with a lower feedthrough capacitance will also help.

 

There are many old mux's that had this problem on switching,
causes a huge spike
audio pre amps used to blank outputs of mux's to absorb spike,

modern mux's have much less feedthrough

whats the part,
as said above, show us your circuit