Chapter 12, Problem 12.77P A feedback system has an amplifier with a low-frequency open-loop gain of 5 × 104 and has poles at 103 Hz, 105 Hz, and 107Hz (a) Determine the frequency f180 at which the phase of the loop gain is 180 degrees. (b) Determine the feedback transfer function ẞ for which the phase margin of the system is 45°. (c) Using the results of part (b), determine the low-frequency closed-loop gain. SAVE ☐

Question 666 electric  Full explain this question very fast

K The open loop transfer function of unity feedback system is By what factor the gain (K) should s(Ts+1) be multiplied so that the damping ratio is increased from 0.2 to 0.8?

An uncompensated system shown in Figure 3(a) has forward transfer function G(s) with a unity feedback. a.  Design a phase lead compensator shown in Figure 3(b) cascaded with the uncompensated system shown in Figure 3(a) that will have a 40% or better improvement of the settling time, at least 3 times improvement in percent overshoot. Assume a compensator zero at (given value zc = -10).Show all the complete solution.

8. For the collector feedback configuration, determine : +16 V (a IB (b) Ic () Vc 3.6 kQ 470 k2 Vc IB B = 120 0.51 k2

Given the feedback circuit below and assuming the voltage amplifier has gain A₂, input resistance R₁ and output resistance Ro, answer the following questions: + a. Loop gain b. Closed loop gain Re C. Input resistance d. Output resistance Rin м + RE A) Sketch the feedback small signal model of this circuit. (Hint: You may convert the input VIN and source resistance Rs to its Norton current equivalent if needed) B) Find the following in terms of the amplifier parameters and resistances R, and RF: Rout

(a) Identify the correct answers 1. Virtual ground of an OP-AMP (a) Is formed only with negative feedback (b) Is always an AC ground, may occasionally be a DC ground (for PMOS) (c) Is coined as a terminology where the input signal splits equally between the terminals (d) Leads to the concept of almost zero difference between the two inputs (both DC and AC) using feedback 2. In an OP-AMP based circuit (a) Phase margin of the closed loop transfer function is a measure of stable operation (b) 45° is a desirable phase margin as it balances the frequency domain stability and the time domain settling optimally (c) Absolute open loop gain numbers are not that important, as long as they are large (d) 45° is only achieved when the RHP zero is placed on one of the poles 3. In a differential amplifier biased with a given tail current I, to increase the overdrive voltage by 2X without changing input capacitive loading, we should (a) Increase W by 2X and reduce L by 2X (b) Reduce W by 2X and…

Need Help on #1.5 part (a)

Using any number of Op-Amps, design multistage amplifier to amplify input Ac signal with 0.01V amplitude, the expected output voltage would have 4V amplitude. The input signal frequency = 10 KHz. Assume gain bandwidth product of Op-Amp = 1 MHz

please do question 2 and 3