NMOS

Simple NMOS Transistor

Block Screenshot

Contents

• `Simple NMOS Transistor`_ +

  • Palette
  • Description
  • Dialog box
  • Default properties
  • Interfacing function
  • Modelica model
  • See also

Palette

• Electrical.cosf - Electrical toolbox

Description

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/V²] 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/modules/scicos_blocks/macros/Electrical/NMOS.sci

Modelica model

• SCI/modules/scicos_blocks/macros/Electrical/NMOS.mo

See also

• PMOS - Simple PMOS Transistor