hw 29 - ECE 201 Spring 2010 Homework 29 Solutions Problem...

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ECE 201 Spring 2010 Homework 29 Solutions Problem 40 (a) The following diFerential equation can be written using KCL at the inverting terminal of the op amp and using the virtual ground concept, v s ( t ) R 1 + v out ( t ) R 2 + C dv out ( t ) dt = 0 v s ( t ) = - 100 u ( t ) = - 100 , t 0 v out ( t ) = 100 R 2 R 1 (1 - e - t/R 2 C ) = 400(1 - e - 2 t ) mV, t 0 Problem not from the book If we denote the voltage at the non-inverting terminal of the op amp as v L ( t ), then using the virtual ground concept, the output voltage is given by V out ( t ) = 10 v L ( t ). Also, v L ( t ) = V IN ( t ) - 1000 i L ( t ). The problem then reduces to ±nding i L ( t ). Due to the square wave shape of V IN ( t ), the graph for i L ( t ) will also be periodic with maximum and minimum values of x and
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hw 29 - ECE 201 Spring 2010 Homework 29 Solutions Problem...

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