In the circuit shown in Fig. P4.28, D1 is a large-area,
Chapter 4, Problem 4.28(choose chapter or problem)
In the circuit shown in Fig. P4.28, D1 is a large-area, high-current diode whose reverse leakage is high and independent of applied voltage, while D2 is a much smaller, low-current diode. At an ambient temperature of 20C, resistor R1 is adjusted to make VR1 = V2 = 520 mV. Subsequent measurement indicates that R1 is 520 k. What do you expect the voltages VR1 and V2 to become at 0C and at 40C?
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