Homework 27 ECE201: Linear Circuit Analysis Due in class: Friday, November 4, 2011 !1. Given the sources and arbitrary values for the resistances in the ideal opamp circuit shown below, determine the power absorbed by the 100Ω load in watts. !!!!!!!!!!!!!!!!!!2. The circuit below is an instrumentation amplifier. It eliminates the need for input resistance (or impedance) matching, which makes the circuit suitable for testing and measurement. Determine the following. a. What is igain in terms of V1, V2, and Rgain? b. What is Va in terms of the sources and resistances? c. What is Vb in terms of the sources and resistances? d. What is V3 in terms of the sources and resistances? e. What is the gain of the opamp, Vo / (V2 – V1), in terms of the resistances? f. If R2 = R3 and R1 = 4Ω, what must be the value of Rgain in ohms for the gain to be 2? g. If the gain is 2, R2 = R3 = 2Ω, R1 = 4Ω, V2 = 6V, and V1 = 3V, then what is Vo? h. If the gain is 2, R2 = R3 = 2Ω, R1 = 4Ω, V2 = 6V, and V1 = 3V, then what is ioa?
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