What are RF Diodes?
RF Diodes are two terminal semiconductor devices that allow flow of current in one direction while restricting in the opposite direction. They are used extensively in radio frequency (RF) applications such as VHF TV tuners, tunable filters, FM radio, tuning LC resonant circuits in microwave frequency, RF receiver protection, phase shifters, voltage control oscillators (VCOs), etc.
RF Diodes can be classified into the following broad categories:
- Limiter Diode: Limiter diode protects the RF receiver from the presence of a large input RF signal.
- PIN Diode: PIN diode has fast response time and can process weaker signals compared to normal PN junction diode. It is ideal for use in attenuators, photodetectors, RF switching, and other applications.
- Schottky Diode: Schottky diode is ideal for fast-switching applications and is used in switching regulators, modulators, mixers, high-frequency detectors, clipping & clamping circuits, computer gating, and more applications.
- Varactor Diode: Varactor diode is ideal for use in applications that require variable capacitance.
- Zener Diode: Zener diode is a heavily doped diode which is generally used under reverse bias conditions. Under the reverse bias condition, the voltage across this diode remains constant, although the reverse current through the diode increases. Hence, the voltage across the diode serves as a reference voltage. The Zener diode is ideal for voltage regulation applications.
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