Q2Analog Circuits
Question
2 marks
Draw diode input output characteristic.
Answer
The V-I characteristic shows an exponential rise in forward bias after cut-in voltage, and a small leakage current in reverse bias until breakdown.
The diode input-output (V-I) characteristic curve is a graph of current () versus voltage ().
- Forward Bias (First Quadrant): The current is nearly zero until the applied voltage exceeds the cut-in voltage (approx. for Silicon). Beyond this, current increases exponentially.
- Reverse Bias (Third Quadrant): A very small, constant reverse saturation leakage current flows. If the reverse voltage is increased too much, avalanche breakdown occurs, causing a massive, sharp increase in reverse current.