Repeat Problem 9.43 for the circuit in Fig. 9.64 with C_in= 4 pF. Inject the test sources on the left-hand side of the feedback resistor. Use a_v(s) from Problem 9.42. Compare the simulation results with the calculated values from Problem 9.42.

Data from Prob. 9.43:

A technique that allows the return ratio to be simulated using SPICE without disrupting the dc operating point is shown in Fig. 8.60 and explained in Problem 8.33.

(a) Use that technique to simulate the return ratio for the op amp from Problem 9.21 connected in a non-inverting unity-gain configuration for f = 1 kHz, 100 kHz, 10 MHz, and 1 GHz.

(b) Use that technique to plot the magnitude and phase of the return ratio. Determine the unity-gain frequency for the return ratio and the phase and gain margins.

Figure 8.60:

Figure 9.64:

R2 R1 (a) R2 V yt R4 (b) 100 k2 100 k2 V. Cin a,(s)v,