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Resistor, Expression-Based (Netlist Only)

Resistor, Expression-Based (Netlist Only)

Instead of the standard resistor syntax with a specified resistance value, you can define the resistance by an expression, using the syntax given in this section.

Note

The expression-based resistor is available for use in netlists, but is not supported in the Components window of the Designer Schematic Editor.

Expression-Based Resistor Instance Netlist Syntax

Rxxxx n1 n2 [modelname] [R=]'expression'

[[TC1=]val] [[TC2=]val]

[M=val] [DTEMP=val] [SCALE=val]

[L=val] [W=val] [C=val]

n1 is the positive node and n2 is the negative node of the resistor. The current is assumed to flow from n1 through the resistor to n2. If a model statement is provided for the resistor, the modelname is its name.

The expression defines the resistance as a function of voltages and currents in the netlist. The expression should be enclosed in single quotation marks. The label R= is optional. The first unlabeled value after a modelname is taken to be the resistance value.

The syntax above shows the labels TC1= and TC2= as optional, but this option depends on the presence or absence of the resistance value, labeled or unlabeled:

• When both modelname and the resistance value are present but the resistance value does not have the R= label, the next two unlabeled values are taken to be TC1, then TC2. To specify a value for TC2, either a value for TC1 must be given as well, or the label TC2= must be used.

• When the resistance value is present with the R= label, the labels TC1= and TC2= are required.

**Expression-Based Resistor Instance Parameters**
Instance Parameter	Description	Unit	Default
C	Parasitic capacitance	Farad	No parasitic capacitance
DTEMP	Temperature difference between resistor and circuit	°C	0.0
L	Resistor length	Meter	0.0
M	Multiplier: simulates parallel resistors	None	1.0
SCALE	Scale factor for resistance	None	1.0
TC1	Linear temperature coefficient	°K^-1	TC1R (model parameter)
TC2	Quadratic temperature coefficient	°K^-2	TC2R (model parameter)
W	Default resistor width	Meter	0.0

Expression-Based Resistor Instance Netlist Example

R25 IN1 N23 R='V(IN1,N23)/2.0e-5'

Expression-Based Resistor Model

The model netlist syntax and parameters for the expression-based resistor are identical to those for the standard resistor (see Resistor Model).

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