how to determin the OPA's accuracy

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yezeg

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To design a mathy oparation for Vout=K3*(K1*Vin1+K2*Vin2),So i used three opa.If the final error less than 0.1%,how to calculate the three opas' accuracy,how to get the DC gain. THX!
 

Hi

Your K1,K2,K3 must have some frequency dependence.That will determine the dc gain.Then from dc gain you can calculate the error at DC.That will be LG/(LG+1).

LG=loop gian
 

thx for deba_fire's reply
the input signal frequency is about 2KHz,I want to use the switch capacitor amplifer
to implement the mathy opration. My question is there are double input signal.
the 1/1+LG is suitable for SISO, Vout=K3*(K1*Vin1+K2*Vin2) is DISO,which is two inputs and one output.
K1,is used SC OPA ,how to get the K1's error range? The same is K2 ,K3.

It's like more a math problem in the signal oparation.

 

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