The equivalent circuit at the interface between the first and second stages of an op-amp is shown in Figure P12.88. The parameters are \(R_{o 1}=2 \mathrm{M} \Omega\), \(R_{i 2}=750 \mathrm{k} \Omega\), and \(C_{i}=1.2 \mathrm{pF}\).

(a) Determine the pole frequency for this part of the circuit.

(b) Determine the additional Miller capacitance \(C_{M}\) that would need to be added so that the pole frequency is moved to \(f_{P D}=6 \mathrm{~Hz}\).

(c) If the gain of the second-stage amplifier is 1000 , what is the required value of a feedback capacitor around the second-stage amplifier to produce this Miller capacitance.

Transcribed Image Text:

Rol R12 Figure P12.88 C: 1 CM