*4.51 In the circuit shown in Fig. P4.51, diodes D 1 D 4 are identical, and each exhibits a voltage drop of 0.7 V at a 1-mA current. (a) For small input signals (e.g., 10-mV peak), find the small-signal equivalent circuit and use it to determine values of the small-signal transmission v o /v i for various values of I: 0 μA, 1 μA, 10 μA, 100 μA, 1 mA, and 10 mA.

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