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Non-Geometric Diode Model, Level 1

Non-Geometric Diode Model, Level 1

The syntax for a Level 1 non-geometric diode model is:

.MODEL modelname D [LEVEL=1] [model_parameter=val] ...

modelname is the name used by the diode instance to refer to the .MODEL statement. The non-geometric (LEVEL=1) diode model is the default if LEVEL is omitted from the .MODEL statement.

**Level 1 Diode Junction DC Model Parameters**
Model Parameter	Description	Unit	Default
LEVEL	1 selects the non-geometric diode model	None	1 (default if LEVEL parameter is omitted)
AREA	Diode area	None	1.0
EXPLI	Current-explosion model parameter	Amp/Meter²	1.0e15
IB (IBV)	Current at breakdown voltage	Amp/Meter²	1.0e-3
IK (IKF, JBF)	Forward-knee current	Amp/Meter²	0.0
IKR (JBR)	Reverse-knee current	Amp/Meter²	0.0
IS (JS)	Saturation current	Amp/Meter²	1.0e-14
JSW (ISP, ISW)	Sidewall saturation current normalized to junction periphery	Amp/Meter	0.0
M	Multiplier for multiple devices	None	1.0
PJ	Junction periphery	None	0.0
L	Diode length	Meter	0.0
N	Emission coefficient	None	1.0
RS	Series resistance	Ohm	0.0
SHRINK	Shrink factor	None	1.0
TNOM	Nominal temperature	°C	25.0
VB (BV, VAR, VRB)	Reverse breakdown voltage	Volt	0.0

**Level 1 Diode Junction Capacitance Model Parameters**
Model Parameter	Description	Unit	Default
CJ (CJA, CJO)	Junction capacitance at zero bias, normalized to junction area	Farad/Meter²	0.0
CJP (CJSW)	Junction capacitance at zero bias, normalized to junction periphery	Farad/Meter	0.0
DCAP	Diode depletion capacitance equation selector	None	2
EXA (MJ)	Grading coefficient at area junction	None	0.5
FC	Coefficient used in forward-bias depletion area calculation	None	0.5
FCS	Coefficient used in forward-bias depletion periphery calculation	None	0.5
MJSW (EXP)	Grading coefficient at periphery junction	None	0.33
PB (PHI, VJ, PHA)	Contact potential at area junction	Volt	0.8
PHP	Contact potential at periphery junction	Volt	PB
TT	Transit time	Second	0.0

**Level 1 Diode Noise Model Parameters**
Model Parameter	Description	Unit	Default
AF	Flicker noise exponent	None	1.0
KF	Flicker noise coefficient	None	0.0

**Level 1 Diode Temperature Effect Model Parameters**
Model Parameter	Description	Unit	Default
CTA (CTC)	Temperature coefficient for area junction capacitance CJ (TLEVC = 1)	°C^-1	0.0
CTP	Temperature coefficient for periphery junction capacitance CJP (TLEVC = 1)	°C^-1	0.0
EG	Energy gap for pn junction diode	electron-Volt	TLEV=0 or 1: 1.11 TLEV=2: 1.16
GAP1	First band gap correction factor	electron-Volt/°C	7.02e-4
GAP2	Second band gap correction factor	°C	1108
TCV	Temperature coefficient of breakdown voltage	°C^-1	0.0
TLEV	Diode temperature equation selector	None	0
TLEVC	Level selector for diode temperature, junction capacitance, and contact potential calculations	None	0
TM1	1st-order MJ temperature coefficient	°C^-1	0.0
TM2	2nd-order MJ temperature coefficient	°C^-2	0.0
TPB (TVJ)	PB temperature coefficient (TLEVC = 1 or 2)	Volt/°C	0.0
TPHP	PHP temperature coefficient (TLEVC = 1 or 2)	Volt/°C	0.0
TRS	Resistance temperature coefficient	°C^-1	0.0
TTT1	1st-order TT temperature coefficient	°C^-1	0.0
TTT2	2nd-order TT temperature coefficient	°C^-2	0.0
XTI	Saturation current temperature exponent	None	3.0

Non-Geometric Diode Instance and Model Netlist Examples

D1 112 314 diode1 AREA=1.05

D12 node3 node22 diode1 M=2 DTEMP=30

.MODEL diode1 D IS=14.24e-9 N=1.981 RS=32.0e-3
+ MJ=0.26 TT=4.9e-6 IKF=93.23 EG=1.11

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