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

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