# HW_8 - EE338K HOMEWORK Differ ential Amplifier s ASSIGNMENT#8 1 Diff Amp P N Diff Amp Eo1 P E1 Measurement 1 E2 N Eo2 Measurement 2 Two separate

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1 EE338K HOMEWORK ASSIGNMENT #8 Differential Amplifiers 1. + _ _ + P N E o2 Diff Amp E 2 + _ Measurement 2 _ + E 1 P N E o1 _ + Diff Amp Measurement 1 Two separate measurements are made on a Differential Amplifier to determine its Common Mode Rejection Ratio. Measurement 1 consists of applying a source voltage E 1 to the amplifier inputs as shown above, and measuring the output voltage, o1 . For measurement 2 the voltage 2 is applied to the inputs in the manner shown above and o2 is measured at the output The result of Measurement 1 is that o1 = -10 1 . For Measurement 2 it is found that o2 = 10 2 2 . Use the results of these two measurements to find the CMRR dB of the Op Amp. 2. R 1 R 2 E P E o + _ E N 1 R 2 R In the circuit above the resistors 1 R and 1 R are both nominally 3k and both 2 R and 2 R are nominally 120k . If the resistor values were exactly equal to the nominal values G c = 0 and d = 40; however, the resistors actually used in the circuit have a tolerance of 5% so assume that their actual values are 1 R = 2.9k , 1 R = 3.1k , 2 R = 125k , and 2 R = 114 k . Assuming that the Op Amp has infinite CMRR, use an asymptotic analysis with the actual resistor values to find the CMRR dB of the differential amplifier circuit. 3. + _ + _ R 1 R 2 E P E o + _ E N 1 R 2 R R 3 4 R R 4

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2 2 In the Instrumentation Amplifier circuit above the nominal values of the resistors are 1 R = 1 R = 3k
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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 at Austin.

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HW_8 - EE338K HOMEWORK Differ ential Amplifier s ASSIGNMENT#8 1 Diff Amp P N Diff Amp Eo1 P E1 Measurement 1 E2 N Eo2 Measurement 2 Two separate

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