R Model-Resistor Model

R_Model:Resistor Model

The SPICE R and Spectre resistor models are translated to the ADS R_Model. For translation information on the resistor device, refer to the Rxxxxxxx for SPICE and the Resistor Device for Spectre.

For more information on the ADS model, place the model in a schematic and choose Edit > Component > Edit Component Parameters to view the model parameters. You can also click Help in the component editor dialog box for additional information.

Example SPICE Command Line:

.model Rmodel1 r RSH=0.0

Example Spectre Command Line:

model resmod resistor rsh=150 l=2u w=2u etch=0.05u tc1=0.1 tnom=27 kf=1

SPICE and Spectre Dialect and Netlist Syntax:

Spice2/3: .model mname r [param= value]*

PSpice: .model mname res [param= value]*

HSpice: .model mname r [param= value]*

Spectre: model mname resistor [param= value]*

ADS Netlist Syntax:

model mname R_Model [param= value]*

ADS Schematic Symbol:

Model Parameters:

For information on parameter format, refer to Using Parameter Mapping Tables to Understand a Translation.

ADS	Default	Unit	Spice2/3	PSpice	HSpice	Spectre
R	0	ohms	-	x	x	r infinity ohms
Rsh	0.0	ohms/sq	x	-	x	rsh infinity ohms/sq
Length	0.0	m	-	-	x	l infinity m
Width	0.0	m	DEFW=1e-6	-	x	w 1e-6 m
Narrow	0.0	m	x	-	-	-
Tnom	25	°C	27 °C	27 °C	x	tnom set by options °C
TC1	0.0	1/°C	x	(0°C ^-1 )	x	tc1 0.0 1/°C
TC2	0.0	1/°C ²	x	(0°C ^-1 )	x	tc2 0.0 1/°C ²
wPmax	infinite	W	-	-	-	-
wImax	infinite	A	-	-	-	-
Trise	0.0	°C	-	-	-	trise 0.0°C
Scale	1.0		-	-	-	scaler 1.0
Dw	0.0	m	-	-	x	etch 0.0 m
Dl	0.0	m	-	-	x	etchl 0.0 m
Kf	0.0		-	-	-	kf 0.0
Af	2.0		-	-	-	af 2.0
Wdexp	0.0		-	-	-	wdexp 1.0
Ldexp	0.0		-	-	-	ldexp 1.0
Weexp	0.0		-	-	-	weexp 0.0
Leexp	0.0		-	-	-	leexp 0.0
Fexp	1.0		-	-	-	fexp 1.0
Coeffs	list(0,0,...)	1/V, 1/V ² , ...	-	-	-	coeffs [0 0 ...]

SPICE Comments:

When the referenced model is not present in the netlist, the netlist translator fails to recognize the resistor model in the following syntax:
r1 1 2 rmodel
The translator assumes that it is a variable name for the resistor value. To correct your imported schematic, manually move the model name to the parameter Model. To correct the ADS Netlist, use the following netlist syntax:

rmodel:r1 1 2 \[param=value\]\*

To prevent the problem, ensure that the netlist translator has access to a model statement so it can verify that "rmodel" is a model. This can be a dummy statement without parameters such as the following:

.model rmodel R

or a .INC reference to an include file with the model available.