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systematic dc offset voltage in fully balanced opamps

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jimito13

jimito13

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Hello,

Is it correct that the systematic dc offset voltage of a fully differential-fully balanced opamp is zero?How can i verify it via a simulation?For a single supply voltage opamp (Vdd,zero Vss),is it right to extract the dc characteristic and find the point that it crosses the vdd/2 point and say that this is the dc offset voltage?Thanks in advance for any helpful answer.
 

I expect any decent fully differential amplifier, will have a
common-mode reference and common-mode feedback circuit.

Your dc offset voltage is still the input difference at output
null (difference). I prefer to use controlled sources with a
ground referred output to pick off the quantities dvi and dvo.
You would criticize dvi at the point where dvo=0, and put
a limit-pair around vcm=(vop+vom)/2 as well.
 

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