Mid2007

# Mid2007 - Question 1(10 points Consider the circuit shown...

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2 Question 1 (10 points) Consider the circuit shown below. You may assume all capacitors/inductors are infinite, and all BJTs are identical and are in the active mode. You must decide where to include the Early effect according to the rules established in class. v in 8 Q1 Q2 Q3 v out R1 R3 R4 Q4 V CC V DD R in1 I R in2 R out V DD v x v y R in3 R2 a) [3 pts] Carefully and neatly draw a small-signal model for this circuit. In terms of the resistances shown and the small-signal parameters of the BJTs, use your model to find an expression for the following (do NOT calculate numerical values). You may refer to R in1, 2, 3 in your expressions as needed. b) [1 pt] R in1 c) [1 pt] R in2 d) [1 pt] R in3 e) [1 pt] R out f) [1 pt] v x /v in g) [1 pt] v y /v x h) [1 pt] v out /v y

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Question 2 (10 points) Consider the differential pair circuit shown below. You may assume V DD = 4V, I BIAS = 6.6 mA, and β = 100. You may also assume that V EB = 0.7V and that the transistors are identical and are in the active

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## This document was uploaded on 09/30/2009.

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Mid2007 - Question 1(10 points Consider the circuit shown...

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