urgent: chopper stabilized amplifier's amplifier stage does not work

Discussion in 'The Projects Forum' started by tiger66, Mar 10, 2007.

  1. tiger66

    Thread Starter New Member

    Mar 10, 2007
    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
  2. chuckey

    Well-Known Member

    Jun 4, 2007
    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?
  3. StoN

    New Member

    Oct 19, 2007