NPN

Simple BJT according to Ebers-Moll

Library

Electrical/Analog/Semiconductors

Description

This model is a simple model of a bipolar npn junction transistor according to Ebers-Moll.

A typical parameter set is:

Bf  Br  Is    Vak  Tauf    Taur Ccs   Cje     Cjc     Phie Me  PHic Mc    Gbc   Gbe   Vt

[-] [-] [A]   [V]  [s]     [s]  [F]   [F]     [F]     [V]  [-] [V]  [-]   [mS]  [mS]  [V]

50  0.1 1e-16 0.02 0.12e-9 5e-9 1e-12 0.4e-12 0.5e-12 0.8  0.4 0.8  0.333 1e-15 1e-15 0.02585

References: Vlach,J.;Singal,K.: Computer methods for circuit analysis and design. Van Nostrand Reinhold, New York 1983 on page 317 ff.

Parameters

    NPN_0

  • Bf [-] : Forward beta (Bf): Scalar.
  • Br [-] : Reverse beta (Br): Scalar.
  • Is [A] : Transport saturation current (Is): Scalar.
  • Vak [1/V] : Early voltage (inverse), 1/Volt (Vak): Scalar.
  • Tauf [s] : Ideal forward transit time (Tauf): Scalar.
  • Taur [s] : Ideal reverse transit time (Taur): Scalar.
  • Ccs [F] : Collector-substrat(ground) cap. (Ccs): Scalar.
  • Cje [F] : Base-emitter zero bias depletion cap. (Cje): Scalar.
  • Cjc [F] : Base-coll. zero bias depletion cap. (Cjc): Scalar.
  • Phie [V] : Base-emitter diffusion voltage (Phie): Scalar.
  • Me [-] : Base-emitter gradation exponent (Me): Scalar.
  • Phic [V] : Base-collector diffusion voltage (Phic): Scalar.
  • Mc [-] : Base-collector gradation exponent (Mc): Scalar.
  • Gbc [S] : Base-collector conductance (Gbc): Scalar.
  • Gbe [S] : Base-emitter conductance (Gbe): Scalar.
  • Vt [V] : Voltage equivalent of temperature (Vt): Scalar.
  • EMin [-] : if x < EMin, the exp(x) function is linearized (EMin): Scalar.
  • EMax [-] : if x > EMax, the exp(x) function is linearized (EMax): Scalar.

Ports

  • Port 1 at left position: implicit input fixedport numbered 1.
  • Port 1 at right position: implicit output fixedport numbered 1.
  • Port 2 at right position: implicit output fixedport numbered 2.

See Also