A negative feedback amplifier has an open loop voltage gain as follows: (1+s/opl)( 1+s/op2) If th...
Q 9. The open-loop gain of an amplifier is A = 65 , and the feedback factor is B = 0.5 . If the open-loop gain A changes by -18% and the feedback factor B changes by +17%, determine the closed-loop gain Af (25 points)
the open loop gain Ao=99990 of a high gain amplifier varies by 20% design a feedback path with feedback factor K such that the closed loop gain only varies by .02%
A unity gain negative feedback system has an open-loop transfer function given by 4. s) = s(1 + 10s)(1 + 10s)? Draw a Bode diagram for this system and determine the loop gain K required for a phase margin of 20 deg. What is the gain margin? 5. We are given the closed-loop transfer function 10(s + 1) T(s) = 82+98+10 for a "unity feedback" system and asked to find the open-loop transfer function, generate a log-magnitude-phase plot for both...
2. Consider the unity feedback negative system with an open-loop function G(S)-KS. a. Plot the locations of open-loop poles with X and zeros with O on an s-plane. b. Find the number of segments in the root locus diagram based on the number of poles and zeros. c. The breakaway point (the point at which the two real poles meet and diverge to become complex conjugates) occurs when K = 0.02276. Show that the closed-loop system has repeated poles for...
3. The open loop transfer function of a unity feedback system is given by \(G(S)=\frac{K}{S(1+S T)}\) Where Tand \(\mathrm{K}\) are constants having positive values. By what factor the amplifier gain be reduced so that (a) peak overshoot of unit step response of the system is reduced from \(75 \%\) to \(25 \% .\) b) The damping ratio increases from \(0.1\) to \(0.6\).
. (15 points) An unstable system can be stabilized by using negative feedback with a gain K in the feedback loop. For instance, consider an unstable system with transfer function which has a pole in the right-hand s-plane, making the impulse response of the system h) grow as increases. Use negative feedback with a gain K> 0 in the feedback loop, and put H) in the forward loop. Draw a block diagram of the system. Obtain the transfer function Gus)...
1. The feedback is negative. True or False? 2. Find the value of the forward amplifier gain 3. If R1=10kΩ, what value should R2 have to have a feedback factor of 1/2? 4. The closed-loop gain is about … (Hint: The closed-loop gain is positive) A) 1.5 B) 2.8 C) 1.9 D) 3.7 5) If the overall forward amplifier has a 150 Hz bandwidth (due to a single dominant pole), the bandwidth of the closed-loop circuit would be around …...
DC Coupled Wideband Feedback Amplifier Voltage-Shunt Feedback Amplifier Current-Shunt Feedback Amplifier Voltage-Series Feedback Amplifier Using the four amplifiers above, analyze the answers to the questions below. 1) Which amplifier has the largest gain-bandwidth product referring to your table of gain bandwidth products? Answer: 2) On the basis of experimental results, state the effects of negative feedback on gain, and input resistance. Answer: 3) State the difference between current and voltage feedback. Answer:
7. For a negative feedback control system with unit feedback gain, its open-loop 100 transfer function is G (s) Design a PID controller, so that the open s(10s) corresponding closed-loop poles are -2+jl and -5. (10 scores) 7. For a negative feedback control system with unit feedback gain, its open-loop 100 transfer function is G (s) Design a PID controller, so that the open s(10s) corresponding closed-loop poles are -2+jl and -5. (10 scores)
Solve Question 2 The open loop gain of an amplifier is given by 105 Av = 10 105 If the closed loop gain is 100: 1. Show that this amplifier will be stable 2. Calculate the phase margin Question 2 The open loop gain of an amplifier is given by 105 Av = 10 105 If the closed loop gain is 100: 1. Show that this amplifier will be stable 2. Calculate the phase margin