ZDiode

Zener Diode with 3 working areas

Library

Electrical/Analog/Semiconductors

Description

The simple diode is a one port. It consists of the diode itself and an parallel ohmic resistance R. The diode formula is:

    i  =   Ids * (exp(v/Vt)-1) - Ibv * exp(-(v+Bv)/(Nbv*Vt)) .

If the exponent in one of the two branches reaches the limit Maxexp, the diode characterisic is linearly continued to avoid overflow.

The zener diode model permits (in contrast to the simple diode model) current in reverse direction if the breakdown voltage Bv (also known zener knee voltage) is exceeded.

Parameters

    ZDiode_0

  • Ids [A] : Saturation current (Ids): Scalar.
  • Vt [V] : Voltage equivalent of temperature (kT/qn) (Vt): Scalar.
  • Maxexp [-] : Max. exponent for linear continuation (Maxexp): Scalar.
  • R [Ohm] : Parallel ohmic resistance (R): Scalar.
  • Bv [V] : Breakthrough voltage = Zener- or Z-voltage (Bv): Scalar.
  • Ibv [A] : Breakthrough knee current (Ibv): Scalar.
  • Nbv [-] : Breakthrough emission coefficient (Nbv): Scalar.

Ports

  • Port 1 at left position: implicit input fixedport numbered 1.
  • Port 1 at right position: implicit output fixedport numbered 1.

See Also