Hi All
I am trying to design a chopper stabilized circuit like Fig4 a) of the attached article "A CMOS Chopper Amplifier"

I can get the input modulator to work but after I attach the opamp, I get a "timestep too small" error message. I tried changing the end time to a big number, but it doesn't fix the problem either

I use multisim for my simulation and my circuit is shown in the attached word doc.

If any of you can help me with my problem and have multsim, I will attach a copy of my multisim file to my next posting.

Can someone please give me some assistant

Thanks in advance for your help

 

It looks to me that the sim prog can't handle your speed, can you reduce the "clock" frequency to say 1/100 (10Hz)and see if it'll work then?
Frank

 

Check the Multisim board. Here is a similar issue and recommended solution.

http://forums.ni.com/ni/board/message?board.id=370&message.id=1910&requireLogin=False