Question

A silicon PN junction diode is forward biased with a constant current at room temperature carrying a constant current of 1 mA. When the temperature is increased by 10°C, the forward bias voltage across the PN junction is approximately equal to

• A. Increases by 60 mV
• B. Increases by 25 mV
• C. Decreases by 60 mV
• D. Decreases by 25 mV

Hint:

When working with PN junction diodes, remember that the forward voltage decreases by approximately 2 mV/°C with increasing temperature for silicon diodes.

Answer 1

The Correct Option is D

The forward voltage across a PN junction diode typically decreases by approximately 2 mV/°C for each 1°C increase in temperature. For a temperature increase of 10°C, the forward voltage drop will decrease by approximately 25 mV. Therefore, the correct answer is option (4).