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(Solved): Consider a feedback amplifier for which the open-loop gain is given by the transfer function in Fig. ...
Consider a feedback amplifier for which the open-loop gain is given by the transfer function in Fig. 2c:
(a) Determine the frequency f180° at which the phase of A(f) is ?180°.
(b) For ? = 0.0045, determine the magnitude of the loop gain T(f) at the frequency f = f180° and determine
the phase of A(f) when |T(f)| = 1. Determine the closed-loop, low-frequency gain. Assess the phase margin to determine whether the system stable or unstable?
(c) Repeat part (b) for ? = 0.15.
![\[
A(f)=\frac{2 \times 10^{3}}{\left(1+j \frac{f}{5 \times 10^{3}}\right)\left(1+j \frac{f}{10^{5}}\right)^{2}}
\]
Fig. 2c Fi](https://media.cheggcdn.com/media/88c/88c4eb7d-3c33-442b-a571-74a0d841ee90/phpKN9DTR)
\[ A(f)=\frac{2 \times 10^{3}}{\left(1+j \frac{f}{5 \times 10^{3}}\right)\left(1+j \frac{f}{10^{5}}\right)^{2}} \] Fig. 2c Figure of Question 5