Varactor Diode Calculator
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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)