In the circuit shown in Fig. P4.51, diodes D1 through D4 are identical, and each
Chapter 4, Problem 4.51(choose chapter or problem)
In the circuit shown in Fig. P4.51, diodes D1 through D4 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 vo/vi for various values of I: 0 A, 1 A, 10 A, 100 A, 1 mA, and 10 mA. (b) For a forward-conducting diode, what is the largest signal-voltage magnitude that it can support while the corresponding signal current is limited to 10% of the dc bias current? Now, for the circuit in Fig. P4.51, for 10-mV peak input, what is the smallest value of I for which the diode currents remain within 10% of their dc values? (c) For I = 1 mA, what is the largest possible output signal for which the diode currents deviate by at most 10% of their dc values? What is the corresponding peak input? What is the total current in each diode? vo vi 10 k D3 I I D2 D4 D1 Figure P4.51 *
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