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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...
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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.
- Fall '07
- Electrical Engineering