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what are the possible ways to improve slew rate of an operational amplifier in CMOS technology?

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What defines the SlewRate? dv/dt = I/C

Many opamps have an internally-compensated "BIG CAP" approach. Examine the schematic of the Fairchild UA709, find its several Rs and Cs that provide the stabilization, and understand that.

Then ask yourself once again ----- what defines the SlewRate?

Its still working with Q = C * V, differentiated and assuming C is constant, to arrive at dV/dT = I/C.

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