Find the voltage drop (Vd) across Silicon diode in the circuit below. [Figure description: A series loop with a 2 A ideal current source (arrow pointing up) on the left, a silicon diode (anode on left, Vd measured + at anode to - at cathode) in the top wire, and a 2 Ω resistor on the right.]
- A. 0.7 V
- B. 0.3 V
- C. 0.42 V
- D. 0.052 V
Answer: D. 0.052 V
Explanation: Small-signal dynamic resistance rd = ηVt/I = (1 × 26 mV)/2 A = 0.013 Ω; dynamic incremental drop across diode Vd = 2 × 26 mV = 52 mV = 0.052 V.