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Nexxim Simulator >
Nexxim Component Models >
Diodes >
Nonlinear Microwave Diode Model, Level = 6

Nonlinear Microwave Diode Model, Level = 6

The syntax for a nonlinear microwave diode model is:

.MODEL modelname D LEVEL=6 [model_parameter=val] ...

modelname is the name for used by diode instances to refer to this .MODEL statement.

**Nonlinear Microwave Diode Intrinsic Model Parameters**
Model Parameter	Description	Unit	Default
LEVEL	6 is required to select the nonlinear microwave diode model	None	1 (default if LEVEL parameter is omitted)
JS	Saturation current	Ampere	1.0e-9
ALFA	Slope factor of conduction current	None	38.696
JB	Magnitude of current at the reverse breakdown voltage	Ampere	10e-6
VB	Magnitude of the reverse breakdown voltage	Volt	-1.0e36
EE	Power-law parameter of breakdown current	None	10.0
R0	Bias-dependent part of series resistance in forward-bias condition	Ohm	0.0
T (TT)	Transit time	Second	0.0

**Nonlinear Microwave Diode Model Capacitance Parameters**
Model Parameter	Description	Unit	Default
AFAC	Slope factor of diffusion capacitance	1/Volt	38.696
CT0	Zero-bias depletion capacitance	Farad	0.0
CD0	Zero-bias diffusion capacitance	Farad	0.0
FI	Built-in junction potential	Volt	0.8
GAMA	Capacitance power-law parameter	1/Volt	0.5
GC1	Varactor capacitance polynomial coefficient 1	1/Volt	0.0
GC2	Varactor capacitance polynomial coefficient 2	1/Volt²	0.0
GC3	Varactor capacitance polynomial coefficient 3	1/Volt³	0.0

**Nonlinear Microwave Diode Model Temperature Parameters**
Model Parameter	Description	Unit	Default
TNOM	Reference temperature	°C	25
XTI	IS temperature exponent	None	2.0
EG	Barrier height at reference temperature	Volt	0.8
M	Junction grading coefficient	None	0.5
AVB	VB linear temperature coefficient	1/°C	0.0
BVB	VB quadratic temperature coefficient	1/°C²	0.0
AR0	R0 linear temperature coefficient	1/°C	0.0
BR0	R0 quadratic temperature coefficient	1/°C²	0.0

**Nonlinear Microwave Diode Model Noise Parameters**
Model Parameter	Description	Unit	Default
KF	Flicker noise coefficient	None	0.0
AF	Flicker noise exponent	None	1.0
FCP	Flicker noise frequency shape factor	None	1.0

Nonlinear Microwave Diode Model Netlist Example

.MODEL NM1 D Level=6

Nonlinear Microwave Diode Model Equations

All components of the equivalent circuit are assumed to be functions of the junction voltage V_j. Nexxim selects this voltage as the only state variable for the microwave diode model. The equations use the following definitions:

V_j = Intrinsic junction voltage state variable

V_t = Thermal voltage = k*TJ/q

k = Boltzmann’s constant

q = Electron charge

TJ = Analysis temperature

Area Effects