hw12_soln

hw12_soln - UNIVERSITY OF CALIFORNIA AT BERKELEY College of...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

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

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: UNIVERSITY OF CALIFORNIA AT BERKELEY College of Engineering Department of Electrical Engineering and Computer Sciences Homework #12 Solutions Due Thursday, December 6, 2007 EE 105 Fall 2007 Prof. Liu Problem 1. BJT Differential Pair a) Assuming R 1 = R 2 (and appropriate transistor matching), the circuit is perfectly symmetric if we know that V in 1 = V in 2 . This means that each branch carries I EE / 2 of current, so that I C 3 = I C 4 and therefore I B 3 = I B 4 . Since R 1 = R 2 , these base currents split evenly through R 1 and R 2 to produce V out + = V out- , or V out = 0. b) Noting that node X is a virtual ground, we have: | A DM | = g m 1 ( r o 1 bardbl r o 3 bardbl R 1 ) = I EE 2 V T parenleftbigg 2 V An I EE bardbl 2 V Ap I EE bardbl R 1 parenrightbigg = 1 2 V T (2 V An bardbl 2 V Ap bardbl R 1 I EE ) = 50 I EE = 1 . 253 mA Problem 2. MOSFET Differential Pair a) I SS = 2 1 2 W L n C ox ( V GS 1 V TH ) 2 = W L n C ox V 2 ov 1 = 444 A A DM = g m 1 R D 1 = 2 I D 1 V...
View Full Document

Page1 / 2

hw12_soln - UNIVERSITY OF CALIFORNIA AT BERKELEY College of...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online