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Hi, thanks for help.
As you said, there will be another term (Ic_opamp_input/Beta)*R added to the output, which would lead to a negative effect on the TC.
In this case, I care more about the reference voltage uniformity than the TC.
Cause the NPN has better uniformity than the NMOS input...
Dear KonstanU, thanks for your reply.
According to the area limitation, I can't eliminate the input-offset voltage of the opamp with switch-capacitor amplifier or chopper amplifier, etc.
Based on your suggestion, the BJT would be more suitable than the MOS input pair for this application...
Hi, Guys.
I am designing an OPAM for bandgap reference with BiCMOS process.
To reduce the OPAMP offset, I used the vertical NPN as the differential input pair.
Because the NPN transistor's collector current is about 60nA, I am afraid that the input current (Ib) of the NPN transistor would...
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