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Unformatted text preview: Will be posted prior to each Quiz ECE331 Section 001 Name: ___________________ Instructor: Prof. B.J. Baliga Print Clearly Quiz 6:_April 15, 2005 with Solutions Problem 1:_OpAmp Circuit (50 points) (a) State the Summing Point Constraint for an OpAmp circuit. (10 points) (b) Identify (by clearly labeling) the negative feedback path for the OpAmp circuit below. (10 points) Solution: Negative Feedback is via resistor R 4 . (c) Solve the OpAmp circuit to obtain the closed loop gain [A vcl = (V o /V i )]. (10 points) Solution: A vcl = (V o /V i )] = R 2 /(R 1 + R 2 ). When solving this circuit, note that resistor R 3 has no current flowing through it due to V id = 0. (d) What is the input impedance for the OpAmp circuit? (10 points) Solution: Input Impedance = (V i /I i )] = (R 1 + R 2 ) (e) What is the output impedance for the OpAmp circuit? (10 points) Solution: Output Impedance is zero because the output voltage is independent of the load resistance....
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- Fall '07