Exercise 4.3.2: Inverting amplifier.AboutThe inverting-amplifier circuit shown below uses a resistor Rf to provide feedback from theoutput terminal to the inverting-input terminal.'p+UnRfwW(a) Use the equivalent-circuit model above to obtain an expression for the closed-loop gainG vo/s in terms of Rs, Ri, R,, RL, Rf, and A.|(b) Determine the value of G for Rg10MS, Rf10Ω, R1k, Ro50Ω,_11k, and A = 106.RISimplify the expression for G obtained in (a) by letting A(ideal op-amp model)o, Ri o0, and Ro 0(Evaluate the approximate expression obtained in (c) and compare the result with the valueobtained in (b).Feedback?W(+

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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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Consider the following statement: In feedback amplifiers, concerning the connections between the direct amplifiers and the feedbacks network, a shunt connectiın at the input part servers to set an increased versiın of the input impedance of the direct amplifier, whereas again a shunt connection at the output part services to set a decreased version of the output imdepance of direct amplifier. Explain what is wrong with the statement above by drawing representative circuit diagrams and outlining the necessary calculations.
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Vs RE www 2₁ www Rc1 11 Vcc RC2 Q₂ RF Q3 +₁ -O V₂ Sketch the feedback small signal model of this circuit.
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Q4: Consider the uA741C-based op-amp amplifier circuit shown below; The input voltage, Vi, is 2.5 volts. R2 is 5,000 ohms and RI is 1,000 ohms : R2 vo • What is the name of the circuit? • What is the value of the voltage at the negative input of the op-amp? • What is the value of the current through the 1 k2 resistor, in?
Compare the closed-loop voltage gain, k = Vo/Vs, for the loaded and unloaded dependent source model of the Voltage Follower with the ideal model of the Voltage to examine the impact of the load, RL on k. - Using any circuit analysis method, derive expressions for the closed-loop gain, k = Vo/Vs, for the ideal opamp Voltage Follower ,both the unloaded ,loaded Voltage Follower using the dependent source model. simplify both of the closed-loop gain expressions for the dependent source models by applying the ideal opamp parameters: A --> infinity , R_i -->infinity and R_0 --> infinity.
An ideal operational amplifier in the open-loop configuration (a comparator) is shown in the figure. positive power +Vcc non-inverting input referenced to common inverting input referenced to common output voltage referenced to common The amplifier has a finite open-loop -Vec negative power common common gain of A = 106 and is powered by a dual power supply of +Vee. What is the amplifier's output %3D voltage in the following cases?
Design a unity gain inverting summing amplifier that will output the sum of two input voltages. Use a feedback resistor of 2.5kQ.
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Figure 6 shows a circuit where feedback is provided between the drain and gate of the transistor M1 Q6 Draw the small signal equivalent circuit of the open loop circuit obtained by breaking the loop at the gate of transistor M1 (suitable for the analysis in the mid band frequency range). Consider Cg as short circuit in the model and state any assumption. (a) (b) State the necessary conditions for the oscillation to occur in the circuit. Using the conditions from (b), derive an expression for the amplifier oscillation frequency fo. (c) Derive the necessary condition for the oscillation to occur in the circuit and state if you can conclude that the circuit will oscillate when considering the values of the inductances L2 = 8 LI = 2 mH; capacitors C = 2 nF; transconductance of the transistor gml = 1.4 mS; and resistors R1 = R2 = Rs : 10 k2. (d) %3D L2 L, R, Cg. C Vout Cp M1 R2 CG Rs Cs Vss = 0 V Figure 6
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