Translating a Device

This chapter provides device translation tables for each of the devices supported by the Netlist Translator.

Recognizing Device Identifiers

Each SPICE device is distinguished by the first letter in it's device name. The following table describes the device type associated with each letter of the alphabet.

SPICE Device Table

Device	Spice2	Spice3	PSpice	HSpice	ADS Translation
Axxxxx					Not translated
Bxxxxx		dep source	gaasfet		N type GaAsFET
Cxxxxx	capacitor	capacitor	capacitor	capacitor	Capacitor
Dxxxxx	diode	diode	diode	diode	Diode
Exxxxx	vcvs	vcvs	vcvs	vcvs	Voltage-Controlled Voltage Source
Fxxxxx	cccs	cccs	cccs	cccs	Current-Controlled Current Source
Gxxxxx	vccs	vccs	vccs	vccs	Voltage-Controlled Current Source
Hxxxxx	ccvs	ccvs	ccvs	ccvs	Current-Controlled Voltage Source
Ixxxxx	current	current	current	current	I_Source (ADS Netlist)
Jxxxxx	jfet	jfet	jfet	jfet,mesfet	N or P type JFET
Kxxxxx	mutual	mutual	mutual	mutual	Mutual Inductor
Lxxxxx	inductor	inductor	inductor	inductor	Inductor
Mxxxxx	mosfet	mosfet	mosfet	mosfet	N or P type MOSFET, also with substrate
Nxxxxx			digital		Not translated
Oxxxxx		lossy tline	digital		Ideal Physical Transmission Line
Pxxxxx					Not translated
Qxxxxx	bjt	bjt	bjt	bjt	NPN/PNP BJT, VBIC
Rxxxxx	resistor	resistor	resistor	resistor	Resistor
Sxxxxx		vc switch	vc switch		Not translated
Txxxxx	tran line	tran line	tran line	tran line	Ideal 4-Terminal Transmission Line
Uxxxxx		rc line	digital src	lossy tline	2 Ideal Transformers, 1 Ideal DRC
Vxxxxx	voltage	voltage	voltage	voltage	V_Source (ADS Netlist)
Wxxxxx		ic switch	ic switch		Not translated
Xxxxxx	subcircuit	subcircuit	subcircuit	subcircuit	subcircuit
Yxxxxx					Not translated
Zxxxxx		mesfet			N or P type MESFET

Documentation Conventions

To help you interpret the ADS and Spectre syntax given for a device, the following table describes the conventions used in this manual.

Device Table Conventions

Description	Example
Keywords, parameter names and other literals are in bold.	poly
Parameters and names that are replaced with values by the user and are translated are in italics.	n1
Optional items are enclosed in square brackets.	[ic=x]
A choice between two or more items is displayed in square brackets separated by vertical bars.	[off \| on]
Repeated optional items are enclosed in square brackets followed by an Asterisk.	[cn]*
Many parameters consist of name=value pairs; the left side is a keyword (literal text), the right side is typically a number, expression or variable (exceptions are noted).	ic=x
Simple keywords and values must appear in the given order, but name=value pairs may occur in any order.

Example:

ctank2 n1 n2 capacitor c0 [ cn ]* [ic= x ] [tc1= y ] [tc2= z ] [ off | on ] [param= value ]*

Notes

The example above is a capacitor with the name: ctank2
The capacitor has two nodes: n1 and n2
The capacitor has a required keyword: capacitor
The keyword is followed by a required value: c0
The required value may be optionally followed by any number of values: [ cn ]*
There are three stated optional name=value pairs which may appear in any order: [ic= x ] [tc1= y ] [tc2= z ]
There is one set of optional keywords of which one may appear but not both:

[ off | on ]

There other name=value pairs which may appear in any order: [param= value ]*
Note
When translating to the ADS Simulator, the node names, values and right hand sides of name=value pairs remain the same; however, the keywords may change to their ADS Simulator equivalents.

Using Parameter Mapping Tables to Understand a Translation

Device parameter information is organized in tables with the ADS parameter, unit, and default value in the three left-hand columns of the table. The parameter translation information is described in the three right- hand columns.

The parameters that are not translated are included in the tables. The parameters under Parameters not in Spectre Model are parameters that are supported in ADS and are not supported in Spectre. The parameters under Parameters not in ADS Model are parameters that are supported in Spectre and are not translated to ADS.

Refer to the Advanced Design System Circuit Components manual for an alphabetical listing of ADS supported devices and a detailed description of their parameters and default values.

Device Tables for Spectre

This section provides individual device translation information for each specific device supported by the Netlist Translator. The following is a list of supported devices:

Resistor Device
Capacitor Device
Inductor Device
Mutual Inductors
Diode Device
BJT Device
MOSFET Device
JFET Device
Subcircuit Reference

Controlled Sources

In Spectre-compatibility mode (default), all controlled sources are translated into Spectre netlist syntax. Therefore, a controlled source in a Spectre netlist will be wrapped by simulator lang=spectre and simulator lang=ads in the ADS netlist. For example, given the following Spectre netlist fragment:

f001r002 (98 194 ) cccs probe=v002 gain=0.013357

the information above would be translated into the following ADS netlist fragment:

simulator lang=spectre
f001r002 _node98 _node194 cccs probe=v002 gain=0.013357
simulator lang=ads

In backward-compatibility mode (-bc option), all controlled sources are translated into ADS netlist syntax.
The device information for controlled sources in backward-compatibility mode (-bc option)

Linear Voltage-Controlled Voltage Source (vcvs)
Linear Voltage-Controlled Current Source (vccs)
Polynomial Voltage-Controlled Voltage Source (pvcvs)
Polynomial Voltage-Controlled Current Source (pvccs)
Linear Current-Controlled Current Source (cccs)
Linear Current-Controlled Voltage Source (ccvs)
Polynomial Current-Controlled Current Source (pcccs)
Polynomial Current-Controlled Voltage Source (pccvs)

Independent Sources

Independent Current Source (Isource)
Independent Voltage Source (Vsource)