Three matched amplifiers are available to amplity a low-level signal. They have the following characteristics: AMPLIFIER GAIN NF 20 1.5 12 dB 6 đB 20 dB The amplifiers are to be connected in cascade. Calculate the lowest overall noise factor obtainable, noting the order in which the amplifiers must be A B 4.0 connected. a1.799, BAC b.1.799, BCA с 2269, ВАС d2 269, BCA

Three matched amplifiers are available to amplity a low-level signal. They have the following characteristics: AMPLIFIER GAIN NF 20 1.5 12 dB 6 đB 20 dB The amplifiers are to be connected in cascade. Calculate the lowest overall noise factor obtainable, noting the order in which the amplifiers must be A B 4.0 connected. a1.799, BAC b.1.799, BCA с 2269, ВАС d2 269, BCA

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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Figure 1(a) shows a series fed class A amplifier circuit. In order to achieve the maximum efficiency, the Q point must be located at the center of the DC load line as shown in Figure 1(b). This generates the maximum output current swing of Icmax (p – p) RC and the maximum output voltage swing is VCEmax(p – p) = Vcc Assume that the maximum input de power is (1 Vcc Pimax(dc) = Vcc!cQ(max)=Vcc \2° Rc. 2Rc Find the maximum efficiency, 7 of this circuit.
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