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Varactor Diode Calculator

Inputs

Outputs

This page provides a Varactor diode calculator as part of a suite of converters and calculators. It helps determine key parameters for varactor diodes.

The calculator computes diode capacitance, cut-off frequency, and quality factor.

EXAMPLE:

INPUTS:

  • Diode capacitance (Cj0) = 100 pF
  • Barrier Potential (Vj) = 0.65 V
  • Reverse bias potential (VR) = -4 V
  • Series resistance (RS) = 12 Ohm
  • Operating frequency (f) = 54 MHz
  • m factor = 1/2

OUTPUTS:

  • Diode capacitance at applied reverse bias (Cj) = 46.4 pF
  • Cut-off frequency (fc) = 286 MHz
  • Q (Quality Factor) = 5.29

Varactor Diode Equation

The following equation or formula is used within the Varactor diode calculator:

Cj = Cj0 / (1 + (VR / Vj))^m fc = 1 / (2 * π * RS * Cj0) Q = 1 / (2 * π * f * RS * Cj)

Varactor diode calculator equation

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