440_hmk3 - ECE 440 Electronics II Homework #3 1. For both...

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ECE 440 – Electronics II Homework #3 1. For both of the current mirrors shown below: a. Find I o if β = 20 for each BJT. b. Repeat part a for β = 50. c. Repeat part a for β = 200. d. What is the advantage of the 3-transistor circuit, based on these results? Circuit 1 Circuit 2 2. The modified Widlar current source shown below has β = 150 and I s = 10 -14 for each BJT. Find I o . 5V 1mA 9.3K ! I o -5V Q1 Q2 5V 1mA 9.3K ! I o -5V Q3 Q1 Q2 15V 15K ! I o -5V Q1 Q3 Q2 500 !
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3. For the circuit shown below, assume that β = 100 and V A = 150 for each BJT. Find: a. The DC collector current for each BJT b. The difference mode gain, A d c. The common mode gain, A c d. The CMRR in dB 15V v s1 v s2 v o 8K ! 8K ! -15V Q1 Q2 143K ! Q3 Q4 I R
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4. For the circuit shown below, assume that β = 100 and V A = 150 for each BJT. Find: a. The DC collector current for each BJT b. The difference mode gain, A d c. The common mode gain, A c d. The CMRR in dB Note that this is the same circuit as problem 3, but with a different current mirror. 5.
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This note was uploaded on 07/24/2009 for the course ECE 440 taught by Professor Alizahid during the Fall '07 term at CSU Northridge.

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440_hmk3 - ECE 440 Electronics II Homework #3 1. For both...

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