BJT Device

The Spectre BJT device is translated as one of the following:

• a nonlinear NPN or PNP BJT device

• a nonlinear NPN or PNP BJT device with substrate

• an NPN device

For information on the BJT model, refer to BJT_Model:Bipolar Transistor Model.

Example Spectre Command Line:

q1 (vcc net3 minus) npn_mod region=fwd area=1 m=1

Spectre Netlist Syntax:

name nc nb ne [ns] mname [param=value]*

ADS Netlist Syntax:

BJT[4]:

mname: qid nc nb ne [ns] [param=value]*

VBIC:

mname: qid nc nb ne ns [param=value]*

ADS Schematic Symbols:

Instance Parameters:

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

Table 7-8. BJT Parameter Mapping

ADS Name	Unit	Default	Spectre Name	Unit	Default
Area		1.0	area		1.0
Region		0 (off)	region		fwd
NPN			(see type model parameter)
PNP			(see type model parameter)
_M		1	m		1
Parameters not in Spectre Model
Temp	°C	25
Mode		on
Noise		on
			Parameters not in ADS Model
			trise	°C	0.0
Temp = trise + temp ("temp" is an ADS global variable)

Table 7-9. VBIC Parameter Mapping

ADS Name	Unit	Default	Spectre Name	Unit	Default
Scale		1	area		1
Region		on	region		fwd
NPN		yes	(see type model parameter)
PNP		no	(see type model parameter)
_M		1	m		1
Parameters not in Spectre Model
Temp	°C	25
Mode		nonlinear
Noise		on
			Parameters not in ADS Model
			trise	°C	0.0
Temp = trise + temp ("temp" is an ADS global variable)

Comments:

• The referenced BJT_Model:Bipolar Transistor Model is read to determine which device to use:

NPN keyword indicates BJT_NPN or BJT4_NPN
PNP keyword indicates BJT_PNP or BJT4_PNP

• If SCALE is specified, Value=Value*scale.

• If trise is provided, Temp=trise+temp (temp is an ADS global variable).