Explanation Given: The given circuit is shown in Figure 1 Figure 1 Here, R i f is the input feedback resistance, R o f is the output feedback resistance, R F is the feedback resistance and h F E is the loop gain. Calculation: As the values of the capacitors are not mentioned, consider them short circuit. Let the value of the input current is i 1 = 53 μA and resistance is R S = 10 6 Ω . The PSpice diagram for the above circuit is shown in Figure 2. Figure 2 The snip for the drop box of the internal parameters of the transistor is shown below in Figure 3 Figure 3 The snip of the drop box for the simulation settings is shown in Figure 4 Figure 4 After simulation left click on the simulation circuit and select the trace option and type “ABS(IRL)/I(Ii)”command in the trace expression box to determine the loop gain as the function of R F . The required plot is shown in Figure 5

MICROELECT. CIRCUIT ANALYSIS&DESIGN (LL)

4th Edition

ISBN: 9781266368622

Author: NEAMEN

Publisher: MCG

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Chapter 12, Problem 12.91CSP

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To investigate: The small signal voltage gain, the input resistance Rif and Rof as a function of the feedback resistance using computer simulation.

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Chapter 12, Problem 12.90P

Chapter 12, Problem 12.93CSP

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A lossless uncharged transmission line of length L = 0.45 cm has a characteristic impedance of 60 ohms. It is driven by an ideal voltage generator producing a pulse of amplitude 10V and width 2 nS. If the transmission line is connected to a load of 200 ohms, sketch the voltage at the load as a function of time for the interval 0 < t < 20 nS. You may assume that the propagation velocity of the transmission is c/2. Answered now answer number 2. Repeat Q.1 but now assume the width of the pulse produced by the generator is 4 nS. Sketch the voltage at the load as a function of time for 0 < t < 20 nS.

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Chapter 12 Solutions

MICROELECT. CIRCUIT ANALYSIS&DESIGN (LL)

Ch. 12 - (a) The open-loop gain of an amplifier is A=5104...Ch. 12 - (a) Consider a general feedback system with...Ch. 12 - (a) A feedback amplifier has an open-loop...Ch. 12 - (a) Consider the circuit shown in Figure...Ch. 12 - (a) The closed-loop gain of a feedback amplifier...Ch. 12 - The gain factors in a feedback system are A=5105...Ch. 12 - Prob. 12.3TYU Ch. 12 - An ideal series-shunt feedback amplifier is shown...Ch. 12 - Consider the ideal shunt-series feedback amplifier...Ch. 12 - An ideal series-series feedback amplifier is shown...

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To investigate: The small signal voltage gain, the input resistance R i f and R o f as a function of the feedback resistance using computer simulation.

Solution Summary: The author analyzes the small signal voltage gain, the input resistance R_if, and the output feedback resistance, using computer simulation.

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To investigate: The small signal voltage gain, the input resistance Rif and Rof as a function of the feedback resistance using computer simulation.

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Chapter 12 Solutions