A voltage-voltage feedback amplifier employs a basic amplifier with input resistance of 20 MOhms, output resistance of 2kOhms and gain A = 1000. The feedback factor k = 0.1. The closed loop input resistance Rince, and the closed loop output resistance Rociof the closed-loop amplifier are: Rincl G and Rounc 52

A voltage-voltage feedback amplifier employs a basic amplifier with input resistance of 20 MOhms, output resistance of 2kOhms and gain A = 1000. The feedback factor k = 0.1. The closed loop input resistance Rince, and the closed loop output resistance Rociof the closed-loop amplifier are: Rincl G and Rounc 52

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter12: Power System Controls

Section: Chapter Questions

Problem 12.3P

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Similar questions

Discuss the difference between the current series negative feedback amplifier and voltage shunt feedback amplifier in terms of output impedance, input impedance, voltage gain, bandwidth, distortion and noise.
2-) The AC equivalent of a feedback amplifier circuit is given in the figure on the right. (Hfe100, Va = ∞, Ic1 = 15 mA, Ic2 = 5mA and Ic3 = 5 mA) a) State the type of feedback used in the circuit, explaining the reason. b) Draw the small signal equivalent of the amplifier circuit. c) Calculate the value of β for the feedback by drawing the β circuit. d) Find the Avf = Vo / Vs closed loop gain of this circuit. e) Find the Rif and Rof values.
(a) Calculate the sensitivity of the closed-loop input resistance of the series-shunt feedback ampliﬁer with respect to changes in open-loop gain A:SRinA = A/ Rin ∂Rin/ ∂A (b) Use this formula to estimate the percentage change in closed-loop input resistance if the openloop gain A changes by 10 percent for an ampliﬁer with A = 94 dB and β = 0.01. (c) Calculate the sensitivity of the closed-loop output resistance of the series-shunt feedback ampliﬁer with respect to changes in open-loop gain A:SRout A = A /Rout ∂Rout /∂A (d) Use this formula to estimate the percentage changeinclosed-loopoutputresistanceiftheopenloop gain A changes by 10 percent for an ampliﬁer with A =100 dB and β =0.01.
Example H.W: If the input impedance and voltage gain of an open loop voltage series feedback amplifier are 3KQ and 100. The feedback factor is % . Find the input impedance of closed loop amplifier.(ANS:9KQ).
Ques 2: What is the Voltage series feedback? Explain the effect of feedback on gain and input, outputimpedance
2. The closed-loop voltage gain of an inverting amplifier is equal toto. The relationship between input resistance and feedback resistanceb. The open loop voltage gainc. The feedback resistance divided by the input resistanced. input resistance.
Use feedback theory to derive an expression for the input impedance of the “shunt-shunt” feedback amplifier as shown.
An inverting amplifier is to be designed with a gain of 5 and an input impedance of 10k ohms. What should be the value of the feedback resistance?
An amplifier has an open-loop gain of 92 dB, Rid = 75 kΩ, and Ro = 1400Ω. The amplifier is used in a feedback amplifier configuration with a resistive feedback network. (a) What is the largest value of current gain that can be achieved with this feedback amplifier? (b) What is the largest valuetransconductance that can be achieved with this feedback amplifier?
Assume that the R2/R1 ratio of a feedback amplifier with voltage supply of +/- 10 V is 3.4 and that a value of 8.5 V is applied to the inverting input of the op-amp. What is the output voltage value?
Discuss the distinction between open-loop gain and closed-loop gain.
Analyze the circuit shown in Figure Shown.(i) Determine the type of negative feedback used in the circuit by showingthe suitable process. (ii) Derive the equation for the feedback factor and the gain of the circuit. (ii) Calculate the feedback factor and the gain of the circuit if R1 = 1.2 kΩ,R2 = 15 kΩ and RL = 6.8 kΩ.