In the emitter follower, the output (emitter) voltage is 0.7V below the input (base) voltage. One way to remove this offset is to use a diode as shown below left. Suppose our input V=2V. Assume beta = 100, VcE,SAT=0v, VBE,ON=0.7, and diode V;=0.7. +5V +5V 1000 R, 500 1N4148 100 Scattering Limit -o Vo 10 V, R=10 R2 1K T, = 25 °C 0.1 0.4 0.8 1.2 1.6 2.0 V- - Forward Voltage (V) 94 9170 a. Determine VB and V. b. Verify your assumed state of the BJT from (a) c. Verify your assumed state of the diode from (a) d. To provide good matching between the diode V; and VBE,ON, We need to have at least 1mA passing through Io, as shown in the datasheet figure above right. What is the maximum V, for which Ip is at least 1mA? To increase this limit, should we change R1 or R2 and in what direction (increase or decrease)? , - Forward Current (mA)

In the emitter follower, the output (emitter) voltage is 0.7V below the input (base) voltage. One way to remove this offset is to use a diode as shown below left. Suppose our input V=2V. Assume beta = 100, VcE,SAT=0v, VBE,ON=0.7, and diode V;=0.7. +5V +5V 1000 R, 500 1N4148 100 Scattering Limit -o Vo 10 V, R=10 R2 1K T, = 25 °C 0.1 0.4 0.8 1.2 1.6 2.0 V- - Forward Voltage (V) 94 9170 a. Determine VB and V. b. Verify your assumed state of the BJT from (a) c. Verify your assumed state of the diode from (a) d. To provide good matching between the diode V; and VBE,ON, We need to have at least 1mA passing through Io, as shown in the datasheet figure above right. What is the maximum V, for which Ip is at least 1mA? To increase this limit, should we change R1 or R2 and in what direction (increase or decrease)? , - Forward Current (mA)

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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