This document describes how different linear controlled sources in Spectre are translated to ADS, including voltage controlled current sources (VCCS), voltage controlled voltage sources (VCVS), current controlled current sources (CCCS), and current controlled voltage sources (CCVS). Each source in Spectre (such as vccs, vcvs, cccs, ccvs) is translated to a corresponding device in ADS (VCCS, VCVS, SDD, SDD) along with examples of the command lines and netlist syntax for both simulators. Parameter mappings are also provided to understand how source parameters in Spectre translate to parameters in the equivalent ADS device.

1. Independent Voltage Source (Vsource)
The Spectre Vsource device is translated as either an V_Source (ADS Netlist) or an
VtUserDef (ADS Schematic).
Example Spectre Command Line:
vpulse1 (1 0) vsource type=pulse val0=0 val1=5 period=100n rise=10n
fall=10n width=40n
Alternate example:
vpwl1 (1 0) vsource type=pwl wave=[1n 0 1.1n 2 1.5n 0.5 2n 3 5n 5] pwlperiod=5n
Spectre Netlist Syntax:
name sink src vsource [param= value ]*
Example ADS Command Line:
V_Source:vpulse1 _node1 0 Vdc=1
V_Tran=pulse(time,0,5,0,10n,10n,40n,100n)
ADS Netlist Syntax:
V_Source:vid n+ n- Vdc=dcval Vac=polar(mag,phase) V_Tran=tranfunc
Alternate example:
V_Source:vpwl1 _node1 0 Vdc=1
V_Tran=pwl(5n,1n,0,1.1n,2,1.5n,0.5,2n,3,5n,5)
Linear Current-Controlled Current Source (cccs)
The Spectre cccs device is translated as an ADS Symbolically-Defined Device (SDD).
Example Spectre Command Line:
Cs1 n1 n2 cccs probe=v002 gain=0.013357

2. Spectre Netlist Syntax:
name p n cccs [param= value ]*
ADS CCCS (SDD):
SDD:Cs1 n2 n1 C[1]="v002" I[1,0]=-1*0.013357*_c1
Linear Current-Controlled Voltage Source (ccvs)
The Spectre ccvs device is translated as an ADS Symbolically-Defined Device (SDD).
Example Spectre Command Line:
f001r002 ( 1 2 ) ccvs probe=v002 gain=0.013357
Spectre Netlist Syntax:
name p n ccvs [param= value ]*
ADS CCVS (SDD):
SDD:f001r002 _node2 _node1 C[1]="v002" F[1,0]=(_v1)-(0.013357*_c1)
Linear Voltage-Controlled Current Source (vccs)
The Spectre vccs device is translated as an ADS VCCS device.
Example Spectre Command Line:
v1 (1 0 2 3) vccs gm=-1 m=2

3. Spectre Netlist Syntax:
name sink arc ps ns vccs __ [param= value ]*
ADS Netlist Syntax:
VCCS: name node1 node2 node3 node4 [param= value ]*
ADS Schematic Symbol:
Instance Parameters:
For information on parameter format, refer to Using Parameter Mapping Tables to
Understand a Translation
Linear VCCS Parameter Mapping
ADS Name Unit Default Spectre Name Unit Default
G Siemens 0.0 gm Siemens 0.0
Parameters
not in Spectre
Model
R1 Ohms 0.0 (Infinity)
R2 Ohms 0.0 (Infinity)
F Hz 0.0 (Infinity)
Parameters not
in ADS Model
m 1
Linear Voltage-Controlled Voltage Source (vcvs)
The Spectre vcvs device is translated as an ADS VCVS device.

4. Example Spectre Command Line:
e1 (out1 0 pos neg) vcvs gain=10
Spectre Netlist Syntax:
name p n ps ns vcvs [param= value ]*
ADS Netlist Syntax:
VCVS: name node1 node2 node3 node4 [param= value ]*
ADS Schematic Symbol:
Instance Parameters:
For information on parameter format, refer to Using Parameter Mapping Tables to
Understand a Translation
Linear VCVS Parameter Mapping
ADS Name Unit Default Spectre Name Unit Default
G V/V 0.0 gain V/V 0.0
Parameters
not in Spectre
Model
R1 Ohms 0.0 (Infinity)
R2 Ohms 0.0
F Hz 0.0 (Infinity)
Parameters not
in ADS Model
m 1