Hello everybody

I want to design a MADC for a Pipeliled-SAR ADC , but I have problems . I have designed a 2-satge Op-Amp that first stage is a Cascode . Op-Amp needs 0.78 V common mode in input to work correctly . when I put it in a capacitive feedback Op-Amp dose not work because capacitors remove common mode voltage of inputs and so Op-Amp dose not have appropriate DC voltage on its input transistors. Can you please tell me how can I implement needed common mode voltage (0.78 v) on Op-Apm's input transistors ??

It is urgent

Thanks

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