Varactor Diode Reverse Bias

It works on reverse biased mode. Varactors are operated in a reverse biased state so no dc current flows through the device.

What Is A Varactor Diode Definition Symbol Working

What Is A Varactor Diode Definition Symbol Working

What Is A Varactor Diode Defintion Construction Working

Varactor diodes are normally operated in the reverse bias condition.

Varactor diode reverse bias. When a reverse bias voltage is applied the electrons from n region and holes from p region moves away from the junction. A varactor diode is a pn junction diode that is especially operated in reverse biased mode. So varactor diode should always be operated in reverse bias.

Generally the depletion region thickness is proportional to the square root of the applied voltage. As a result the width of depletion region increases and the capacitance decreases. These diodes are very small in size and very light weight.

If the varactor diode reverse voltage is increased then the depletion region size increases. This means when reverse bias decreases. Here you will learn how the varactor diode acts as a variable capacitor and how the varactor diode can be controlled by varying the reverse bias voltage across the pn junction.

Varactor diode is a reverse biased p n junction diode whose capacitance can be varied electrically. The amount of reverse bias controls the thickness of the depletion zone and therefore the varactors junction capacitance. As a result these diodes are also referred to as varicaps tuning diodes voltage variable capacitor diodes parametric diodes and variable capacitor diodes.

The varactor diode always works in reverse bias and it is a voltage dependent semiconductor device the diode whose internal capacitance varies with the variation of the reverse voltage such type of diode is known as the varactor diode. There is no useful when it is. The size of the depletion region of diode changes with change in reverse bias.

The word varicap is originated from the combination of word variable and capacitor. Varactor diode is the one which works on the principle of variation in capacitance by changing the width of the depletion region of p n junction. The characteristics of varactor diode have the following.

These diodes significantly generate less noise compared to other diodes. The capacitance is controlled by applied voltage. When the reverse bias increases the width of the depletion region also increases resulting in less capacitance.

The p n junction diode creates capacitor effect. Similarly if the varactor diode reverse voltage is decreased then the depletion region size decreases or narrows. The cost of these diodes is available at lower and more reliable also.

The following figure shows the symbol of varactor diode. It is a device whose capacitance changes with the variation in the applied reverse bias potentialit is also known as varicap or voltcap.

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