Question: Calculate the return ratio for the inverting amplifier in Fig. 9.64. Here, the controlled source and C in form a simple op-amp model. Assume a

Calculate the return ratio for the inverting amplifier in Fig. 9.64. Here, the controlled source and C in form a simple op-amp model. Assume a_v(s) = 1000/[(1 + s/100) (1 + s/10⁶)].

(a) Assume the op-amp input capacitance C_in = 0.

What is the frequency at which |R (jÏ‰)| = 1? How does this frequency compare to the frequency at which |a_v(jÏ‰)| = 1?

(b) Find the phase margin for the cases C_in = 0, C_in =4 pF, and C_in =20 pF.

Figure 9.64:

100 k2 100 k2 Ve a,(s)v. Cin

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