Homework 26 ECE201: Linear Circuit Analysis Due in class: Wednesday, November 2, 2011 1. For the ideal operation amplifier shown below, determine the following. a. What are the numerical values for i2 and i-? b. In terms of the sources and resistances, what are the voltages at the inverting V- and non-inverting V+ terminals of the ideal opamp? c. If V2 = 0V, V1 = 30, R1 = 2Ω, and Rf = 1 Ω, find Vout. d. If V2 = 10V, V1 = 30, R1 = 2Ω, and Rf = 1Ω, find Vout. e. If V2 = 10V, V1 = 30, R1 = 2Ω, and Rf = (1/2)Ω, find Vout. f. If V2 = 10V, V1 = 30, R1 = 2Ω, and Rf = 10Ω, find ioa. g. If V2 = 30V, V1 = 10, R1 = 2Ω, and Rf = 10Ω, find ioa. h. Gain is defined as Vout/Vin. What does Rf need to be such that the gain of the opamp has a magnitude of 1000? Assume that Vin = V1, R1 = 2Ω, and V2 = 0V. i. If V1 = V2 = 10V, then what is Vout and ioa? j. If a load of RL = 10Ω is placed across the output terminals, then what is the power absorbed by RL? Assume that V2 = 10V, V1 = 5Ω, R1 = 10Ω, R2 = 15Ω, and Rf = 20Ω. k. Consider the configuration given in problem 1j again; determine ioa. l. The maximum output voltage (saturation voltage) for an opamp typically cannot exceed the voltage that powers the opamp. The voltage that powers the opamp is usually not shown in schematics. If the saturation voltages are –15V and 15V for this opamp, i.e. –15V < Vout < 15V, then what is the maximum voltage that Vin = V1 can be such that its gain has a magnitude of 1000? Assume that V2 = 0V and R1 = 2Ω. !!2. For the ideal opamp shown below, determine the following. a. Symbolically express Voa in terms of the resistances Rf, R1, R2 and sources V1, V2? b. If Voa = –16V1 – 12V2 and Rf = 64Ω, find suitable values for the resistances R1 and R2. For the following problems, assume that the resistances are R1 = 2Ω, R2 = 4Ω, Rf = 2Ω, R3 = 2Ω, R4 = 4Ω, and RL = 4Ω, and the voltage sources are V1 = 2V, V2 = 4V, and V6 = 8V. c. Determine i5. d. Determine ioa. e. Determine i6. f. Determine VL. g. What voltage does V6 need to be tuned to such that i6 = 0A?
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