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A varactor diode, also known as a varicap diode, is a type of semiconductor device that functions as a variable capacitor. It operates by varying its capacitance based on the voltage applied across its terminals. Typically made from silicon or gallium arsenide, varactor diodes are designed to exploit the voltage-dependent capacitance of a reverse-biased p-n junction. They are commonly used in tuning circuits, frequency modulation, and voltage-controlled oscillators.
| Material | Silicon or gallium arsenide |
| Capacitance range | 1 pF to 1000 pF |
| Reverse voltage rating | Up to 100V |
| Quality factor (Q) | Typically 50 to 200 |
| Operating frequency | DC to several GHz |
When selecting a varactor diode, consider the required capacitance range and the maximum reverse voltage rating for your application. It's also important to specify the quality factor (Q) needed for optimal performance in your circuit. Additionally, check for any specific certifications or grades required by your industry standards. Quantities can vary based on project needs, so be clear about your order size when requesting a quote.
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It acts as a variable capacitor, changing capacitance with applied voltage.
They are used in tuning circuits, frequency modulation, and voltage-controlled oscillators.
They are usually made from silicon or gallium arsenide.
Capacitance typically ranges from 1 pF to 1000 pF.
The quality factor indicates the efficiency of the varactor diode in resonant circuits.
Reverse voltage influences the capacitance and operational limits of the diode.