This is a basic tutorial on PIN Diodes, with some examples of how they are used in RF switch applications.

discussing the unique characteristics of PIN diodes and how these characteristics are used for switching large RF signals. The unique ability to have the resistance of the diode be adjusted by changing the bias current can be used for other applications such as variable attenuators, modulators, phase shifters, etc.

PIN diodes aren’t suitable in applications that require fast turn-off characteristics when reversed biased – such as rectifier, detector or mixer applications. PIN diodes do make excellent fast (relatively speaking) RF switches.

This video answers a lot of questions about how diodes can be used to switch AC / RF signals.