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Design an opamp for Cyclic ADC

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A.jafari

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Hi everybody.
I want to design a cyclic ADC and at this time I want to implement and design an Opamp for this purpose.
my ADC features are:

Fs:20 MS/s Number of bit:12

could you tell me what the parameters are for Opamp ?
I design an Opamp with these parameters but it doesn't work in my ADC.

Gain=60 db phase margin=60' bandwidth=850 MHz

what is the best structure for Opamp in this kind of ADC.

Please help me. I need your help.
best wishes
A.Jafari
 

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