440_hmk3

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

This preview shows pages 1–4. Sign up to view the full content.

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 !

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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
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.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## 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.

### Page1 / 5

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

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online