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HW4 - Questions

# HW4 - Questions - UNIVERSITY OF CALIFORNIA College of...

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UNIVERSITY OF CALIFORNIA College of Engineering Department of Electrical Engineering and Computer Sciences EE 105 Prof. Salahuddin Fall 2009 Homework Assignment #4 Due at the beginning of class on Friday, 9/29/09 Problem 1 [15 points]: Resistive Voltage Divider Biasing Consider the circuit below, in which the BJT performance parameters are β = 100, I S = 6 × 10 -16 A, and V A = . Suppose the desired collector current ( I C ) is 0.2 mA. a) What is the required value of R 1 ? (Note: You should account for base current,) b) What is the “error” in I C if β deviates from its nominal value by 5%? (By what percentage does I C change if β increases by 5%)? c) What is the “error” in I C if R 1 deviates from its nominal value by 5%? (By what percentage does I C change if R 1 increases by 5%)? Problem 2 [15 points]: Biasing with Emitter Degeneration Consider the same circuit as in Problem 1, but with emitter degeneration. ( β = 100, I S = 6 × 10 -16 A, V A = .) a) Determine the value of R 1 required to achieve a collector current of 0.2 mA.

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