REVERSE CHARACTERISTICS OF A PN JUNCTION DIODE
Автор: Sandip Parui
Загружено: 2022-02-01
Просмотров: 310
REVERSE BIASING OF A DIODE:
Reverse biasing means that applying an external voltage which is opposite in direction to forward bias. So here we connect positive terminal of battery to n-side of the diode and negative terminal of the battery to p-side of the diode. This completes the reverse bias circuit for pn junction diode. Now to study its characteristics (change in current with applied voltage), we need to repeat all those steps again. Connect voltmeter, ammeter, vary the battery voltage, note the readings etc.
Here the interesting thing to note is that, diode does not conduct with change in applied voltage. The current remains constant at a negligibly small value (in the range of micro amps) for a long range of change in applied voltage. When the voltage is raised above a particular point, say 80 volts, the current suddenly shoots (increases suddenly). This particular value of applied voltage, where reverse current through diode increases suddenly is known as “break down voltage“or "zener voltage" or "avalanche voltage".
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