Application Note

Application Note: PIN Diode Fundamentals

Source: Microsemi Corporation
By Bill Doherty, Microsemi

A PIN diode is a semiconductor device that operates as a variable resistor at RF and microwave frequencies. The resistance value of the PIN diode is determined only by the forward biased dc current. In switch and attenuator applications, the PIN diode should ideally control the RF signal level without introducing distortion which might change the shape of the RF signal. This article highlights the role of Microsemi PIN diodes in RF circuit design and provides applications for each.

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