Question: Calculate and sketch the root locus for the amplifier of Problem 9.4 as f varies from 0 to 1. Estimate the value of f causing

Calculate and sketch the root locus for the amplifier of Problem 9.4 as f varies from 0 to 1. Estimate the value of f causing instability and check using the Nyquist criterion.

Data from Prob. 9.4:

An amplifier has a low-frequency forward gain of 40,000 and its transfer function has three negative real poles with magnitudes 2 kHz, 200 kHz, and 4 MHz.

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