Problem 4 10 Points A Which Of The Five Magnitude Phase Bode Plots Shown In Fig 4 C Corresponds To A Phase Margin 1 (78.86 KiB) Viewed 40 times
Problem 4 (10 points): (a) Which of the five magnitude-phase Bode plots shown in Fig. 4(c) corresponds to a phase margin of 60° for the closed-loop circuit shown in Fig. 4(a)? Justify your answer in detail. (b) If the op-amp is realized by the circuit shown in Fig. 4(c), find the low-frequency gain and estimate the dominant pole p₁ as a function of the appropriate small-signal parameters and capacitor values. Assume that the voltage gain of the 2nd stage is very large and make any appropriate approximations. Then find the expression for the unity-gain frequency assuming that it is well within the 1-pole roll-off region of the open-loop magnitude frequency response. Assume that the output stage has a gain of 1. VDD M₂ Vout Vin 9k ww 1k Fig. 4(a) M₁ M₂ Iss M₁ Cc+Cgd4 M₂ Fig. 4(b) M5 IDA M₂ HCM₂ M₂ V. out ID6 +
A₂ (ساز) 24 | (نماز) A| | -60 -90+ -180+ ا . (ساز) LA | (ساز) | | -90+ -120+ -180+ A: i. iii. 0 Ag 10 (ساز) 24 -90+ - 120 - 180+ Ag (ساز) 24 | |A(j) | ا |(ساز) | | -90+ -180+ -240+ ii. iv. 00 000 ·00