Question

Show the shape of the characteristics of a diode.

Hint:

In the V-I characteristics of a diode, current remains low in reverse bias until breakdown, and increases exponentially in forward bias after the threshold voltage.

Answer 1

Diode V-I Characteristics

The V-I characteristics of a diode are categorized into two primary regions:

1. Forward Bias

When the p-side of the diode is connected to the positive battery terminal and the n-side to the negative, it is in forward bias. In this state, current rises exponentially with increasing voltage. Initially, current is minimal, but after reaching the threshold voltage (approximately 0.7 V for silicon diodes), current increases sharply.

2. Reverse Bias

In reverse bias, current remains negligible until the reverse breakdown voltage is attained. Beyond this voltage, current increases significantly in the reverse direction. Reverse breakdown occurs when the voltage surpasses a critical limit, enabling reverse conduction through the diode.