An op amp has a low-frequency open-loop voltage gain of 100,000 and a frequency response with a single negative-real pole with magnitude 5 Hz. This amplifier is to be connected in a series-shunt feedback loop with f = 0.01 giving a low-frequency closed-loop voltage gain A₀‰ˆ 100. If the output impedance without feedback is resistive with a value of 100 Ω, show that the output impedance of the feedback circuit can be represented as shown in Fig. 9.58, and calculate the values of these elements. Sketch the magnitude of the output impedance of the feedback circuit on log scales from 1 Hz to 100 kHz.

Figure 9.58:

Transcribed Image Text:

R2 R1