Scicos Block
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Simple NMOS Transistor

Contents

• Simple NMOS Transistor
  • Palette
  • Description
  • Dialog box
  • Default properties
  • Interfacing function
  • Modelica model
  • See also
  • Authors

Palette

• Electrical.cosf - Electrical toolbox

Description

The NMos model is a simple model of a n-channel metal-oxide semiconductor FET. It differs slightly from the device used in the SPICE simulator. For more details please care for H. Spiro.

The model does not consider capacitances. A small fixed drain-source resistance is included (to avoid numerical difficulties).

W [m]	L [m]	Beta [1/Vē]	Vt [V]	K2	K5	DW [m]	DL[m]
12.e-6	4.e-6	.062	-4.5	.24	.61	-1.2e-6	-.9e-6	depletion
60.e-6	3.e-6	.048	.1	.08	.68	-1.2e-6	-.9e-6	enhancement
12.e-6	4.e-6	.0625	-.8	.21	.78	-1.2e-6	-.9e-6	zero
50.e-6	8.e-6	.0299	.24	1.144	.7311	-5.4e-6	-4.e-6
20.e-6	6.e-6	.041	.8	1.144	.7311	-2.5e-6	-1.5e-6
30.e-6	9.e-6	.025	-4.	.861	.878	-3.4e-6	-1.74e-6
30.e-6	5.e-6	.031	.6	1.5	.72	0	-3.9e-6
50.e-6	6.e-6	.0414	-3.8	.34	.8	-1.6e-6	-2.e-6	depletion
50.e-6	5.e-6	.03	.37	.23	.86	-1.6e-6	-2.e-6	enhancement
50.e-6	6.e-6	.038	-.9	.23	.707	-1.6e-6	-2.e-6	zero
20.e-6	4.e-6	.06776	.5409	.065	.71	-.8e-6	-.2e-6
20.e-6	4.e-6	.06505	.6209	.065	.71	-.8e-6	-.2e-6
20.e-6	4.e-6	.05365	.6909	.03	.8	-.3e-6	-.2e-6
20.e-6	4.e-6	.05365	.4909	.03	.8	-.3e-6	-.2e-6
12.e-6	4.e-6	.023	-4.5	.29	.6	0	0	depletion
60.e-6	3.e-6	.022	.1	.11	.65	0	0	enhancement
12.e-6	4.e-6	.038	-.8	.33	.6	0	0	zero
20.e-6	6.e-6	.022	.8	1	.66	0	0

Dialog box

• Width [m]
  W
  Properties : Type 'vec' of size 1.

• Length [m]
  L
  Properties : Type 'vec' of size 1.

• Transconductance parameter [A/(V*V)]
  Beta
  Properties : Type 'vec' of size 1.

• Zero bias threshold voltage [V]
  Vt
  Properties : Type 'vec' of size 1.

• Bulk threshold parameter
  K2
  Properties : Type 'vec' of size 1.

• Reduction of pinch-off region
  K5
  Properties : Type 'vec' of size 1.

• Narrowing of channel [m]
  dW
  Properties : Type 'vec' of size 1.

• Shortening of channel [m]
  dL
  Properties : Type 'vec' of size 1.

• Drain-Source-Resistance [Ohm]
  RDS
  Properties : Type 'vec' of size 1.

Default properties

• Inputs :
  • Modelica variable name : 'G'
    Implicit variable.

• Outputs :
  • Modelica variable name : 'D'
    Implicit variable.

  • Modelica variable name : 'B'
    Implicit variable.

  • Modelica variable name : 'S'
    Implicit variable.

• Parameters :
  • Modelica parameter name : 'W'
    Default value : 0.00002
    Is a state variable : no.

  • Modelica parameter name : 'L'
    Default value : 0.000006
    Is a state variable : no.

  • Modelica parameter name : 'Beta'
    Default value : 0.000041
    Is a state variable : no.

  • Modelica parameter name : 'Vt'
    Default value : 0.8
    Is a state variable : no.

  • Modelica parameter name : 'K2'
    Default value : 1.144
    Is a state variable : no.

  • Modelica parameter name : 'K5'
    Default value : 0.7311
    Is a state variable : no.

  • Modelica parameter name : 'dW'
    Default value : -0.0000025
    Is a state variable : no.

  • Modelica parameter name : 'dL'
    Default value : -0.0000015
    Is a state variable : no.

  • Modelica parameter name : 'RDS'
    Default value : 10000000
    Is a state variable : no.

• File name of the model : NMOS

Interfacing function

• SCI/macros/scicos_blocks/ModElectrical/NMOS.sci [view code]

Modelica model

• SCI/macros/scicos_blocks/ModElectrical/Electrical.mo [view code]

See also

• PMOS - Simple PMOS Transistor (Scicos Block)

Authors

www.modelica.org