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Unformatted text preview: b. The amplifier is to be compensated so that it is stable for any value of R f . Dominant pole compensation with 45 degrees of phase margin is implemented with the capacitor C c as shown below. Determine the proper value of C c . +V i o V ++1 k R f A1 A2 C c 3. Consider the feedback amplifier circuits shown below. a. Specify the type of feedback used in amplifier ckts A and B. b. The input impedance R in diagrammed on both circuits must be less than 5 k . Which circuit (A or B) should be used. Qualitatively justify your answer. c. Find the closed loop gain V o I s for R f = 100 k for amplifier circuit A. Solutions to Discussion #9 Review Problems 1. a. Op amp input connections wrong. Reverse them. b. Open loop amplifier gain too large. Reduce gain to approximately three by reducing 40 k resistor to an 8 k resistor. c. d. 2. a. b. 3....
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 Fall '08
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