Figure 5 shows a current series feedback amplifier. The sampled current signal is the output current, I, flowing in resistor, Rg, where it develops a feedback signal voltage V; across the resistor, Rg. Determine: a) the feedback gain, B %3D Io b) the gain without feedback, A Vs = A c) the gain with feedback, Af 1+BA

Figure 5 shows a current series feedback amplifier. The sampled current signal is the output current, I, flowing in resistor, Rg, where it develops a feedback signal voltage V; across the resistor, Rg. Determine: a) the feedback gain, B %3D Io b) the gain without feedback, A Vs = A c) the gain with feedback, Af 1+BA

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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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.
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?
Q1 Design an operational-amplifier circuit using two inverting configurations to produce the output vo = +201 + 0.5v2 – 0.2v3 – 1v4. Choose feedback resistor Rf = 220kN for each amplifier. %3D | -
3C Problem 1. (P1) Three op-amps are connected in cascade configuration. An 80 microVolts signal is connected to the non-inverting input of the first op-amp. Both the 2nd and 3rd op-amps operates as inverting amplifiers. All feedback resistors are 420 KOhms while the input resistances are 71.4kOhms, 19.1kOhms, and 14KOhms respectively. Determine the gain of the third stage stage. a.-22 b.22 c.-30 d.31
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- Zero. b- Slightly different from zero. O Maximum positive or negative. d- An amplified sin wave. 9-Negative feedback reduces @ The feedback fraction. b- Distortion. c- The input offset voltage. d- The open-loop gain. 10-The input impedance of a current-voltage converter is Small. b- Large. c- Ideally zero. d- Ideally infinite. a- 11-In a linear op-amp circuit, the @ Signal are always sin wave. b- Op-amp does not go into saturation. c- Input impedance is ideally infinite. d- Gain-bandwidth product is constant.
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