A voltage amplifi er with open-loop gain a(jf) 5 a0y[(1 1 jfyf XXXXXXXXXXjfyf2)] is operated in negative feedback with  5 0.1 V/V. (a) If the closed-loop dc gain is A0 5 9 V/V, fi nd a0; hence,...

A voltage amplifi er with open-loop gain a(jf) 5 a0y[(1 1 jfyf1) 3 (1 1 jfyf2)] is operated in negative feedback with  5 0.1 V/V. (a) If the closed-loop dc gain is A0 5 9 V/V, fi nd a0; hence, develop a standard-form expression for A(jf) in terms of f1 and f2. (b) If it is found that the phase and magnitude of A(jf) at f 5 10 kHz are 2908 and 90y11 V/V, what are the values of f1 and f2? (c) Find the crossover frequency fx and, hence, the phase margin m. (d) Find m if  is raised to 1 V/V.