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Nexxim Simulator >
Nexxim Component Models >
Maxwell Spice Legacy Elements >
   S-Element Voltage-Controlled Switch       

S-Element Voltage-Controlled Switch

 

S-Element Voltage-Controlled Switch Instance Netlist Format

The S-element voltage-controlled switch is generated for Nexxim by Maxwell SpicelinkÔ. This element has the netlist format:

Sxxx n+ n- c+ c- modelname

n+ and n- are the positive and negative signal voltage nodes. c+ and c- are the positive and negative control voltage nodes. modelname is the name of a .MODEL statement of type SW elsewhere in the netlist. See the SW Switch Model description for the operation of the switch.

S-Element Voltage-Controlled Switch Instance Netlist Example

s1 1 2 3 4 switch1

SW Switch Model

The SW model statement has the following netlist syntax:

.MODEL modelname SW [model_parameters]

The modelname is the name used by S-elements to reference this model definition. The keyword SW is required for voltage-controlled switch models.

 


SW Model Parameters

Parameter

Description

Units

Default

ROFF

OFF resistance

Ohm

1.0e12

RON

ON resistance

Ohm

1.0

VT

Threshold voltage

Volt

0.0


SW Switch Model Netlist Example

.MODEL switch1 SW ROFF=1.7 RON=5e+6 VT=5.0

SW Switch Model Notes

1. The switch model describes an almost-ideal switch. Properly selected on and off resistances can effectively be zero and infinity by comparison with other circuit elements.

2. The switch is set to ON when [V(c+) - V(c-)] > VT. In the ON state, the resistance from n+ to n- is Ron. The switch is set to OFF when [V(c+) - V(c-)] £ VT. In the OFF state, the resistance from n+ to n- is Roff.

 




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