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a question about pss+pnoise simulation in a chopper-aplifier

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ehsan_nazarzadeh

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I try to simulate a chopper instrumentation amplifier. Chopping frequency is 5 KHz and cut-off frequency is 700 Hz. I use pss+pnoise analysis to see the noise spectrum and measure the integrated noise, but it seem to be wrong. Is it necessary to put an ideal “Sample-and-Hold” circuit in chopper-amplifier structure and then run pss+pnoise analysis? If “YES”, then which sampling frequency should I choose? If “NO”, then what are the correct settings of pss+pnoise analysis?

pnoise.JPGpss.JPG
 

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