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common mode reference voltage:

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samiurrehman

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Dear all,

A common mode feedback circuit takes the output of the differential circuit as inputs, averages them and finally subtract them from the "common mode reference voltage" to yeild the desired output which is supposed to be fed into the main differential amplifier. Can anyone tell me what the value of this reference voltage be?
I have implemented the common mode feedback amplifier but its not working!
 

... Can anyone tell me what the value of this reference voltage be?
The desired quiescent output voltage, usually the center between power and ground ((VDD-VSS)/2), in order to achieve max. large-signal operation.
 

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