✓ Pin Diode Reverse Breakdown

Pin Diode Reverse Breakdown

The pin diode is reverse biased there is no stored charge in the i region and the device behaves like a capacitance c t shunted by a parallel resistance r p. If the d c voltage across the pin diode is zero there remains some finite charge stored.

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These equivalent circuit parameters are defined in the section below.

Pin diode reverse breakdown. The intrinsic layer between the p type and n type regions of the pin diode enable it to provide properties such as a high reverse breakdown voltage and a low level of capacitance and there are also other properties such as carrier storage when it is forward biased that enable it to be used for certain microwave applications. The maximum reverse bias voltage that can be applied to a p n diode is limited by breakdown. The wide depletion layer provided by the intrinsic layer ensures that pin diodes have a high reverse breakdown characteristic.

Generally the lower the voltage rating the less expensive the pin diode. As the capacitance of a capacitor reduces with increasing separation this means that a pin diode will have a lower capacitance as the depletion region will be wider than a conventional diode. The pin diode is used as a photo detector to convert the light into the current which takes place in the depletion layer of a photo diode rising the depletion layer by inserting the intrinsic layer progresses the performance by increasing the volume in where light change occurs.

Thus if all the charge carriers are not removed from the intrinsic layer it may lead to the flow of current. The breakdown voltage is a key parameter of power devices. Breakdown is characterized by the rapid increase of the current under reverse bias.

When the pin diode is at zero or reverse bias there is no stored charge in the i region and the diode appears as a capacitor c. The pin diode in reverse biased is used in various devices working at microwave frequencies such as microwave switch. It is found that at low levels of reverse bias the depletion layer become fully depleted.

Pin diodes of the same bulk breakdown voltage may have different voltage ratings. This also reduces the capacitance between both the regions thus raising the level of isolation when the pin diode is reverse biased. The corresponding applied voltage is referred to as the breakdown voltage.

This pin diode characteristic can have significant advantages in a number of rf applications for example when a pin diode is used as an rf switch.

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