# HW_5 - EE338K HOMEWORK Input and Output Impedances...

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EE338K HOMEWORK ASSIGNMENT #5 Input and Output Impedances 2. 1. 3. 4. E s + _ _ + R s =100k R 1 =1k R 2 =9k R L = 1 k E o G = E o / E s + _ R s =1k R 1 =4k R L =2k I s R 2 =1k I o G = I o / I s _ + ( ) + E E a r o =100 r i =100k () + () Op Amp Model a =10 5 + _ R s =250 R 1 =3k R L =2k E o I s G = E o / I s + _ _ + R s =500k R 1 =10k R L =100 E s I o G = I o / E s 1. For each of the circuits above use the feedback method to find: a.) the input impedance, Z in , seen by the source ( E s - R s Thevenin source or I s - R s Norton Source) and b.) the output impedance, Z out , seen by the load resistor, R L . Note 1. For Circuits 1 and 2 use the method that involves opening the feedback loop in the external circuit to find Z U and Z D . For each of these two circuits break the loop open at the same place used in Assignment #4. Also, use the Loop Gain values shown for the respective circuits in the solutions for Assignment #4. Note 2. For circuits 3 and 4 use the method that involves turning off the main amplifier gain. Also, use the Loop Gain values shown for the respective circuits in the solutions for Assignment #4.

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## This note was uploaded on 10/26/2009 for the course EE 338k taught by Professor Bostick during the Fall '09 term at University of Texas.

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HW_5 - EE338K HOMEWORK Input and Output Impedances...

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