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Q. Find the output voltage in terms of the input voltage?
In order to illustrate the insensitivity of feedback circuits to variations of the op-amp parameters, let us consider a simple feedback circuit using an op amp, as shown in Figure (a). Using the op-amp model of Figure, find the output voltage in terms of the input voltage under two sets of conditions:
(a) A = 10, Ri = 10 k, RL = 1k, RS = 1k
(b) A = 2 × 105, Ri = 30 k, RL = 5k, RS = 2k
In order to simplify the calculations, let us assume that the op amp's output resistance Ro is zero.
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