May I know why Opamp slew rate is defined at unity gain.
Can we say there is no relation between Slew rate and gain.
I know that slew rate depends on the Iq and Cc,but in the case of op-amp if we increase the Iq then there will be decrease in the gain.if u decrease the Iq then gain will increase.(rds=1/lambda*Id) gain of the op-amp=gain1st stage * gain2ndstage
I think you are getting two things mixed up. If you model an op amp as a transconductance stage driving an integrator,
then SR is a function of Iq and Cc. But the output stage might be a dog, and the sr would be less.
SR on the data sheet is for the whole part.
We could always spec sr at a gain of -5 or +10 or whatever, but for 40 years, it's been a gain of +1, so we can compare
op amps over the ages.
PS " if we increase the Iq then there will be decrease in the gain." What about a bipolar? We do make op amps w/ BJTs.....