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Dynamic dither used in sigma-delta adc

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jennysheng

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Hi, all:
I added dynamic dither into my ADC to eliminate spurs due to offset. It is weird that the SQNR of ADC with dynamic dither is higher than that without dither. Is there any one can give me an explain or tell me what could be wrong? I do the simulation in Matlab. Both are under the same configuration.

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