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R1 R; R2 ERE FIGURE P2.48 (c) Calculate R; for each of the two above cases if R, = R, = R; = 10 kN, and the BJT has B, = 100 and VA Compare the two results, and comment! o, and is biased at Ic = 1 mA. Note: this problem illustrates the so called boot-

R1 R; R2 ERE FIGURE P2.48 (c) Calculate R; for each of the two above cases if R, = R, = R; = 10 kN, and the BJT has B, = 100 and VA Compare the two results, and comment! o, and is biased at Ic = 1 mA. Note: this problem illustrates the so called boot-

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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2.48
R1 R; R2 RE FIGURE P2.48 (c) Calculate R; for each of the two above cases if R, = R, = RE = 10 kN, and the BJT has B, = 100 and VA = 0, and is biased at lc = 1 mA. Compare the two results, and comment! Note: this problem illustrates the so called boot- strapping technique, which is used to raise the input resistance of an emitter follower. In a practical situation, what is shown here as a switch is a capacitor, which acts as an open cir- cuit at de, but is designed to act as a short circuit at ac. 마
Transcribed Image Text:R1 R; R2 RE FIGURE P2.48 (c) Calculate R; for each of the two above cases if R, = R, = RE = 10 kN, and the BJT has B, = 100 and VA = 0, and is biased at lc = 1 mA. Compare the two results, and comment! Note: this problem illustrates the so called boot- strapping technique, which is used to raise the input resistance of an emitter follower. In a practical situation, what is shown here as a switch is a capacitor, which acts as an open cir- cuit at de, but is designed to act as a short circuit at ac. 마
2.48 (a) Use simple inspection to come up with an expression for R; in the circuit of Fig. P2.48 (switch open). (b) Next, investigate the effect of closing the switch. Replace the BJT with its small-signal model, and use the test-signal method to show that now R; is increased to R = R, + (1 + g„R)R, R, = R,llr, R, = R,1/RĘ
Transcribed Image Text:2.48 (a) Use simple inspection to come up with an expression for R; in the circuit of Fig. P2.48 (switch open). (b) Next, investigate the effect of closing the switch. Replace the BJT with its small-signal model, and use the test-signal method to show that now R; is increased to R = R, + (1 + g„R)R, R, = R,llr, R, = R,1/RĘ
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