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biase voltage of opamp in pipelin adc (Read 1337 times)

frankdhz New Member Offline Posts: 6	biase voltage of opamp in pipelin adc Apr 08^th, 2009, 7:42am After changing from sample phase to amplify phase ,the Cs and Cf disconnect from input common voltage of the opamp in the MDAC . How dose the input DC biase voltage can be sustained during the amplify phase?
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rf-design

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Reiner Franke

Posts: 165
Germany

Re: biase voltage of opamp in pipelin adc
Reply #1 - Apr 11^th, 2009, 2:14am

I could not imagine how the amplifying SC circuit make a floating connection to the opamp inputs.

General the inputs of the opamp must have a specific potential. Otherwise the common mode input voltage drift with a period and more critical the output is undefined. If your SC-circuit does not need the opamp in a phase switch it off.

Please post a schematic.

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