20101ee115A_1_hw4ee115a

# 20101ee115A_1_hw4ee115a - EE115A Winter2010 Homework#4 Due...

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EE115A Prof. Frank Chang Winter2010 Homework #4 Due Tue, Feb 9th, 2010 Problem 1. Fig 1. For the circuit shown in figure 1, I C is designed to be 0.25mA. Assume I S equals 6*10 -16 A, β =100 and Early voltage equals . (a) Determine the required value of R 1 . (b) What is the error in I C if R E deviates from its nominal value by 5%? Problem 2. Fig 2. (a) Draw the small-signal model for the circuit shown in figure 2. (b) Find V out /V in .

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(Note: you don’t need to find the DC operating point for this problem and you may assume the Early voltage is ). Problem 3. Fig 3. For the circuit shown in figure 3, the g m is designed to be 1/260 and if β = 100, I S = 2*10 -17 A, and Early voltage equals determine the required R B, operating point and the input impedance looking into the base. Problem 4. Sketch the I C - V CE characteristics of an npn transistor having β =100 and Early voltage =100V. Sketch the characteristic curves for i
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## This note was uploaded on 09/28/2010 for the course EE EE115A taught by Professor Kaiser during the Winter '09 term at UCLA.

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20101ee115A_1_hw4ee115a - EE115A Winter2010 Homework#4 Due...

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