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Q_Card

Record for BJT parameters

 

Description

Parameters

Modelica Standard Library

Description

The Q_Card record holds the technology parameters for a bipolar junction transistor.

Parameters with value −1·1040 are special default values used to indicate the user has not selected a value.

All capacitor parameters must be assigned positive values. MapleSim's engine does not currently handle the defective differential equation that occurs when the capacitance is zero.

Parameters

Name

Default

Units

Description

Modelica ID

Tnom

27

°C

Parameter measurement temperature

TNOM

IS

1·10−16

A

Transport saturation current

IS

BF

100

 

Ideal maximum forward beta F

BF

NF

1

 

Forward current emission coefficientF

NF

NE

32

 

B-E leakage emission coefficient

NE

ISE

−1·1040

A

B-E leakage saturation current, default = 0

ISE

ISC

−1·1040

A

B-C leakage saturation current, default = 0

ISC

BR

1

 

Ideal maximum reverse beta

BR

NR

1

 

Reverse current emission coefficient

NR

NC

2

 

B-C leakage emission coefficient

NC

VAF

0

V

Forward Early voltage

VAF

IKF

0

A

Forward beta roll-off corner current

IKF

VAR

0

V

Reverse Early voltage

VAR

IKR

0

A

Reverse beta roll-off corner current

IKR

RE

0

Ω

Emitter resistance

RE

RC

0

Ω

Collector resistance

RC

IRB

0

A

Current for base resistance = (rb+rbm)/2

IRB

RB

0

Ω

Zero bias base resistance

RB

RBM

0

Ω

Minimum base resistance, default = 0.0

RBM

CJE

0

F

Zero bias B-E depletion capacitance

CJE

VJE

34

V

B-E built in potential

VJE

MJE

33

 

B-E junction exponential factor

MJE

TF

0

s

Ideal forward transit time

TF

XTF

0

 

Coefficient for bias dependence of TF

XTF

ITF

0

A

High current dependence of TF,

ITF

VTF

0

V

Voltage giving VBC dependence of TF

VTF

PTF

0

Hz

Excess phase at freq=1/(TF2Pi) Hz

PTF

CJC

0

F

Zero bias B-C depletion capacitance

CJC

VJC

34

V

B-C built in potential

VJC

MJC

33

 

B-C junction grading coefficient

MJC

XCJC

1

 

Fraction of B-C cap to internal base

XCJC

TR

0

s

Ideal reverse transit time

TR

CJS

0

F

Zero bias C-S capacitance

CJS

VJS

34

V

Substrate junction built-in potential

VJS

MJS

0

 

Substrate junction grading coefficient

MJS

XTB

0

 

Forward and reverse beta temperature exponent

XTB

EG

1.11

eV

Energy gap for IS temperature effect on IS

EG

XTI

3

 

Temperature exponent for IS

XTI

KF

0

 

Flicker Noise Coefficient

KF

AF

1

 

Flicker Noise Exponent

AF

FC

12

 

Forward bias junction fit parameter

FC

Modelica Standard Library

The component described in this topic is from the Modelica Standard Library. To view the original documentation, which includes author and copyright information, click here.

See Also

Spice3 Overview

Spice3 Semiconductors