typical input impedance of ADCs

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amic

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I need to apply a load cap and load resistor equal to the typical input impedance of 6 bit successive approximation ADC to my OTA with buffer. Any suggestions as to what values I need to use as loads for the OTA. Also is there any min load max load test that I can do to charecterize my op amp ?

I am using 1.8V supply and 0.18um technology.

Sachin
 

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