hw5_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 #5 Solutions Due Tuesday, October 2, 2007 EE 105 Fall 2007 Prof. Liu Problem 1. Common Emitter Core Design a) Ill use R C to refer to the 50 k resistor. | A v | = g m ( r o bardbl R C ) = g m R C = 20 g m = 20 50 10 3 = 0 . 4 mS I C = g m V T = 10 . 4 A V CE,min = 0 . 8 V = V CC,min I C R C V CC,min = 0 . 8 + I C R C = 1 . 32 V b) | A v | = g m ( r o bardbl R C ) = I C V T parenleftbigg V A I C bardbl R C parenrightbigg = 20 I C = 10 . 97 A V CE,min = 0 . 8 V = V CC,min I C R C V CC,min = 0 . 8 + I C R C = 1 . 3485 V 1 . 35 V Note that the Early effect increases I C for a given V BE , so that the voltage drop across R C is increased, and thus V CC should be higher to ensure operation in forward active mode. Problem 2. Common Emitter Stage a) The equivalent load resistance is R 1 + parenleftBig 1 g m 2 bardbl r 2 bardbl r o 2 parenrightBig R 1 + 1 g m 2 (by inspectionreview...
View Full Document

This homework help was uploaded on 04/02/2008 for the course EE 105 taught by Professor King-liu during the Fall '07 term at University of California, Berkeley.

Page1 / 3

hw5_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