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implementation of opamp in the pipeline adc

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A.jafari

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Hi.
I'm going to design a pipeline ADC and implement with real Opamp.
when I try to design Opamp and implemented it in the ADC, my converter doesn't work.
Does anybody can help me?

pipeline features:

Fs=120meg, Number of bits=12;

opamp feature:

fu=340M, dc gain=82db,I have enough slew rate
phase margin=70 degree.

So where is the problem?
Thanks
 

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