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

Hi I searched the component name LTC1043 on LTspice, but I can't seem to find it. Is it an extra component I need to download?

If you have one, can you please email me a copy?

I simulate my chopper stabilized circuit on multisim because I can't find a way to generate spectral analysis of a signal on LTspice. Can LTspice do spectral analysis?

A major problem I have right now is I can't get the opamp stage of my chopper stabilized amplifier to work. I try to simulate Fig4a in the article "A CMOS Chopper Amplifier" by Christian C. ENZ.

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

Can someone please give me some assistant.

I can email you the article and my multisim file if that makes it easier to understand my problem

Thanks

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tiger66
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