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Chopper freq of (boser-wooley) two stage sigma-delta ADC

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fxxjssc

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boser wooley

Dear all,
i am trying to design two stage sigma-delta ADC with Fs=125K,
but my chopper freqency is FS/2. the input of ADC is DC component,
so is my chopper freq too high for my application? Thanks.
what is common chopper freq. of such application. Thans.
jason
 

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