(b) A transistor constant current source is shown in Fig. 7. Analyse the circuit to find an expression for the DC current IL and show that it is independent of the load RL and the power supply Vcc. Assume the Zener is modelled by just its knee voltage Vzк (that is, rz = 0), and the transistor is modelled by VBE (that is, r = 0) and 3. R RL IL D RE Vcc Figure 7: Transistor-based constant current source. (c) Use your answer to part (b) to design a 20 mA current source, given Vcc : = 12 V and ẞ> 100. Find the values of R, RE, and VZK, together with the minimum power ratings of D and RE. Assume D requires 10 mA to maintain reverse breakdown.

(b) A transistor constant current source is shown in Fig. 7. Analyse the circuit to find an expression for the DC current IL and show that it is independent of the load RL and the power supply Vcc. Assume the Zener is modelled by just its knee voltage Vzк (that is, rz = 0), and the transistor is modelled by VBE (that is, r = 0) and 3. R RL IL D RE Vcc Figure 7: Transistor-based constant current source. (c) Use your answer to part (b) to design a 20 mA current source, given Vcc : = 12 V and ẞ> 100. Find the values of R, RE, and VZK, together with the minimum power ratings of D and RE. Assume D requires 10 mA to maintain reverse breakdown.

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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