Given the operating point V₀ = 1.1 V, I₀ = 73 mA for the diode of Problem 4.66 and assuming n = 2, find its reverse saturation current I_s.

Data from Problem 4.66

(a) In the circuit of Fig. 4-66(a), determine the diode’s DC operating point (I₀, V₀). The diode’s characteristic is given in Fig. 4-61(b). Hint: Verify the Thévenin equivalent circuit shown in Fig. 4-66(b). Then use the result of Problem 4.57 (V₀ = 1.1 V, I₀ = 73 mA).

(b) A small AC voltage signal e = 0.6 sin t is added to the voltage source, as seen in Fig. 4-66(c), producing an additional small AC current i(t) in the diode. Find r, the small-signal model of the diode at the DC operating point and verify the small-signal model of the circuit shown in Fig. 4-66(d). Then determine the diode’s AC current i(t). Assume the diode’s terminal characteristic to be I = I_s(e^40V − 1), with n = 2.

Data from Problem 4.57

Find the diode’s DC operating point (I₀, V₀) in the circuit of Fig. 4-59(a) using the graph of Fig. 4-59(b).

Transcribed Image Text:

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