Capacitance of p-n varactor junction

The principle of operation of the variator is based on the dependence of the barrier capacitance of the p-n junction on the voltage value. Knowing the doping coefficient, the material parameter and the capacity without bias voltage, it is possible to calculate the capacity of the varactor at a given voltage.

capacitance

Barrier capacitance of the p-n junction.

Symbol:

C

Latex:

\(C\)

Dimension:

capacitance

capacitance_without_bias_voltage

Barrier capacitance of the p-n junction without the bias voltage.

Symbol:

C_0

Latex:

\(C_{0}\)

Dimension:

capacitance

voltage

voltage applied.

Symbol:

V

Latex:

\(V\)

Dimension:

voltage

material_parameter

A certain constant having the dimension of voltage which depends on the exact material.

Symbol:

V_0

Latex:

\(V_{0}\)

Dimension:

voltage

doping_coefficient

Doping coefficient.

Symbol:

y

Latex:

\(y\)

Dimension:

dimensionless

law

C = C_0 / (1 - V / V_0)^y

Latex:

\[C = \frac{C_{0}}{\left(1 - \frac{V}{V_{0}}\right)^{y}}\]