GaAsFET and JFET Models for SPICE

The following information describes how the various GaAsFET models from SPICE are translated to the corresponding ADS models.

All GaAsFET devices in SPICE reference a model by its instance name. GaAsFET models in SPICE have a keyword

• NMF | PMF for Spice3,

• GASFET for PSpice and

• NJF | PJF for HSpice.

PSpice and HSpice also use a Level parameter to help identify the appropriate model to select. ADS uses the Idsmod parameter to identify the model to use. The SPICE Level is used by the Netlist Translator to determine what value to set for Idsmod and which model to place. Both the Level and Idsmod parameters are listed where available.

Table 8-21 displays Spice3 MESFET device and model information and the corresponding device and model information for schematics and netlists in ADS.

Table 8-21. Spice3 MESFET Mapping Table

Format	Device	Model	ADS Idsmod
Spice3 Netlist	Zxxxxxxx	NMF | PMF	-
ADS Schematic	GaAsFET	Statz_Model:Statz (Raytheon) GaAsFET Model	Idsmod = 3
ADS Netlist	-	GaAs

Table 8-22 displays the initial and translated devices, models and Idsmod values for each of the individual formats listed for the PSpice GaAsFET. PSpice level parameter values are also listed.

Table 8-22. PSpice GaAsFET Mapping Table

PSpice Level	Format	Device	Model	ADS Idsmod
All	PSpice Netlist	Bxxxxxxx	GASFET	-
Level = 1	ADS Schematic	GaAsFET	Advanced_Curtice2_Model:Advanced Curtice-Quadratic GaAsFET	Idsmod =1
	ADS Netlist	-	GaAs
Level = 2	ADS Schematic	GaAsFET	Statz_Model:Statz (Raytheon) GaAsFET Model	Idsmod = 3
	ADS Netlist	-	GaAs
Level = 3	ADS Schematic	TOM	TOM_Model:Triquint Scalable Nonlinear GaAsFET Model	Idsmod = 7
	ADS Netlist	-	GaAs
Level = 4	Not translated.
Level = 5	Not translated.

Table 8-23 displays the device, model and Idsmod (where used) for each of the individual formats listed for the HSpice JFET and GaASFET. The HSpice level parameters and SAT parameters are also listed where appropriate.

Table 8-23. HSpice JFET & GaAsFET Mapping Table

HSpice Level	Format	Device	Model	ADS Idsmod
All	HSpice Netlist	Jxxxxxxx	NJF | PJF	-
Level = 1	ADS Schematic	JFET_NFET or JFET_PFET	JFET_Model:Junction Field Effect Transistor Model	-
	ADS Netlist	-	JFET
Level = 2	Not translated.
Level = 3 SAT = 0	ADS Schematic	GaAsFET	Advanced_Curtice2_Model:Advanced Curtice-Quadratic GaAsFET	Idsmod =1
	ADS Netlist	-	GaAs
Level = 3 SAT = 2	ADS Schematic	GaAsFET	Statz_Model:Statz (Raytheon) GaAsFET Model	Idsmod = 3
	ADS Netlist	-	GaAs
Level = 3 SAT = 1,3	Not translated.