OP07C: About the size of feedback capacitor in differential operational amplifier circuit

Closed loop BW is set by C2 with a pole at fp=1/(2*pi*R2*C2).

Non-inverting input filter is set by C4 with a pole at fp = 1/(2*pi * C4*R3//R4) where R3//R4 = (R1*R2)/(R1+R2).

In addition consider downloading the free SPICE simulator from TI, TINA-TI at:

http://www.ti.com/tool/tina-ti

By building and simulating your circuit in TINA-TI many problems can be avoided before building it in the real world. If you have problems once the circuit is built in TINA-TI feel free to post the schematic from TINA-TI on the E2E Forum for further assistance.

Hi Jin,

to get the best common mode rejection at DC and AC, the components R1...R4, C2 and C4 should be matched, like shown is section 8.1.3 of datasheet LMC6482. e.g.

Kai