Scicos Block
fr - eng

##
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/Electrical/NMOS.sci [view code]

### Modelica model

- SCI/macros/scicos_blocks/Electrical/NMOS.mo [view code]

### See also

- PMOS - Simple PMOS Transistor (Scicos Block)

### Authors

www.modelica.org