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Contents

Electronic Devices

PN Junction

PN Junction Basics Forward and Reverse Bias Diode Equation Junction Capacitance Breakdown Mechanisms Small Signal Model

BJT Fundamentals

BJT Operation BJT Configurations Current Components Ebers-Moll Model Transistor Switching

FET Fundamentals

JFET Basics MOS Capacitor MOSFET Structure MOSFET Operation MOSFET I-V CMOS Basic

Special Devices

Zener Diode Tunnel Diode Varactor Diode Schottky Diode UJT

Optoelectronics

Light Emitting Diodes Photodiodes Solar Cells Laser Diodes Fiber Optic Sources Phototransistors Optocouplers

Power Devices

Power Diodes Power MOSFETs IGBTs Thyristors GTO and TRIAC

Other Topics

IC Fabrication Basics Nanoelectronics Intro MEMS Single Electron Transistor

Other Subjects

Analog Electronics Digital Electronics Signals & Systems Control Systems Electromagnetic Theory Digital Communication Analog Communication Network Analysis Microprocessors VLSI Design Verilog HDL Power Electronics Embedded Systems DSP

Section Progress60%

3 of 5 articles

Varactor Diode

Voltage dependent capacitance.

Updated: 19 March 2026

12 min read

Varactor Diode Quiz

Test your grasp of voltage-variable capacitance and varactor diode tuning circuit applications.

Question 1 of 3

Q1.For an abrupt p-n junction varactor, the junction capacitance Cj varies with reverse voltage VR as:

Related Articles

Varactor Diode

Voltage variable capacitance, tuning circuit applications.

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Zener Diode

Breakdown mechanism, regulator application.

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UJT

Unijunction Transistor operation.

9 min read

Diode Equation

Shockley equation, I-V curve.

9 min read

Power Diode

Reverse recovery characteristics, Schottky diodes.

12 min read