hi i'm designing a neural amplifier and i have got the required results but it has a 30 mv glitch i need to remove it with a simple circuit what should i do ? i attached the required schematic and an image of the output .thanks in advance.
pictures are as i written down here :
glitch.png : output waveform
Screenshot-20.png :tgate switch that has this glitch
glitch1.png : general circuit:

 

What appears to be a glitch looks more like digital overflow and wrap-around of a sine wave.

Are you using an analog-to-digital converter (ADC) in the process?
How many bits does the ADC output?
How many bits are you recording?

 

Yet I had worked with brain signal logging some 30 or more years ago, in the climax of vacuum gauge systems, I remember well there was NO ANY gliches. Thus those are not in the nerves, it are hidden in Your opamps.
The solution - use a opamps what are specially designed for cardiological use, I dont remember just now the tradenames, but it exists at least more than few, from one is specially good and was begun to fabricate only at 206/2017. Find the best sinphase signal attenuation (CMR factor) and "glich" will evaporate. Try the octopart search engine for querry.

 

I'm not sure I understand what you are referring to as the glitch. Is it the small spikes at the "tips" of the waveform?

This looks to me like gate charge injection from the analog switches. I don't know enough to give you any advice on how to deal with it, only that it is a common issue with analog switches. Limiting the slew rate of the gate signal can sometimes help, but that may cause other issues.

 

thanky you.