Two feedback amplifiers are connected in series. Each amplifier has a distortion of 20%. Determine the overall gain and the overall distortion if (a) each amplifier has its own feedback, as shown in Fig. P10.4(a) and (b) only one feedback is applied to the cascaded amplifiers, as shown in Fig. P10.4(b). FIGURE P10.4 A 100 20% distortion As= 100 20% distortion A 100 20% distortion 0 A2 100 20% distortion B=0.1 A=0.4 β=0.1 (a) Cascaded feedback (b) Feedback on cascaded amplifiers 10.5 A feedback amplifier is to have a closed-loop gain of A「60 dB and a sensitivity of 10% to the open-loop gain A. Determine the open-loop gain with a unity feedback β = 1 solution
