Chapter 12, Problem 12.19EP

Consider the loop gain function
$T(f)=\frac{\beta (3000)}{\left(1+j\frac{f}{{10}^3}\right){\left(1+j\frac{f}{{10}^5}\right)}^2}$

For $\beta =0.008,$ determine the low-frequency closed-loop gain and the phase margin.

(Ans. $A_f(0)=120$ , phase margin $={66.8}^{°}$ )