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Q.2 (a) The open-loop gain of an amplifier is A = 60 dB. If the open-loop gain decreases by 30 pero the closed-loop gain must not change by more than 0.5 percent. Determine the required valu the feedback factor and the closed-loop gain. (b) An amplifier has an open-loop gain of 100 k2, an input resistance of 10 k2 and an output resistance of 15 k. If negative feedback is applied to give a loop gain of 10, determine the with feedback, Rif, Rof and voltage gain with feedback. (c) An amplifier has a voltage amplification Av and a fraction Br of its output is fed back in opposition to the input. If ßr = 0.01 and A, = 80, calculate the percentage change in the gain of the system if A, falls 20 dB due to ageing.

Q.2 (a) The open-loop gain of an amplifier is A = 60 dB. If the open-loop gain decreases by 30 pero the closed-loop gain must not change by more than 0.5 percent. Determine the required valu the feedback factor and the closed-loop gain. (b) An amplifier has an open-loop gain of 100 k2, an input resistance of 10 k2 and an output resistance of 15 k. If negative feedback is applied to give a loop gain of 10, determine the with feedback, Rif, Rof and voltage gain with feedback. (c) An amplifier has a voltage amplification Av and a fraction Br of its output is fed back in opposition to the input. If ßr = 0.01 and A, = 80, calculate the percentage change in the gain of the system if A, falls 20 dB due to ageing.

Introductory Circuit Analysis (13th Edition)
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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EENG342 Electronics II/Page 3 Q.2 (a) The open-loop gain of an amplifier is A = 60 dB. If the open-loop gain decreases by 30 percen the closed-loop gain must not change by more than 0.5 percent. Determine the required value o the feedback factor and the closed-loop gain. (b) An amplifier has an open-loop gain of 100 k2, an input resistance of 10 kN and an output resistance of 15 kN. If negative feedback is applied to give a loop gain of 10, determine the gai with feedback, Rif, Rof and voltage gain with feedback. (c) An amplifier has a voltage amplification Av and a fraction Br of its output is fed back in opposition to the input. If Br= 0.01 and A, = 80, calculate the percentage change in the gain of the system if A, falls 20 dB due to ageing.
Transcribed Image Text:EENG342 Electronics II/Page 3 Q.2 (a) The open-loop gain of an amplifier is A = 60 dB. If the open-loop gain decreases by 30 percen the closed-loop gain must not change by more than 0.5 percent. Determine the required value o the feedback factor and the closed-loop gain. (b) An amplifier has an open-loop gain of 100 k2, an input resistance of 10 kN and an output resistance of 15 kN. If negative feedback is applied to give a loop gain of 10, determine the gai with feedback, Rif, Rof and voltage gain with feedback. (c) An amplifier has a voltage amplification Av and a fraction Br of its output is fed back in opposition to the input. If Br= 0.01 and A, = 80, calculate the percentage change in the gain of the system if A, falls 20 dB due to ageing.
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