Diodes - Variable Capacitance (Varicaps, Varactors)

Variable Capacitance Diodes, also known as varicap diodes or varactors, are a type of semiconductor diode that exhibits a variable capacitance characteristic.  These diodes are designed to function as voltage-controlled capacitors, allowing their capacitance to be adjusted by varying the reverse bias voltage applied across the diode.

What are Variable Capacitance Diodes used for？

• Commonly used in frequency-modulated (FM) radios, television tuners, phase-locked loops, and voltage-controlled oscillators.
• Found in tuning circuits where variable capacitance is required for frequency tuning.

What are the Characteristics of Variable Capacitance Diodes？

• Fast response time to voltage changes.
• High linearity in capacitance vs. voltage characteristics.
• Can operate at high frequencies due to their small size and low parasitic capacitance.