NAME_TABLE:

C_Function_Name: cm_sidiode

Spice_Model_Name: sidiode

Description: "simple diode"

PORT_TABLE:

Port_Name: ds

Description: "diode port"

Direction: inout

Default_Type: gd

Allowed_Types: [gd]

Vector: no

Vector_Bounds: -

Null_Allowed: no

PARAMETER_TABLE:

Parameter_Name: ron roff

Description: "resistance on-state" "resistance off-state"

Data_Type: real real

Default_Value: 1 1

1

If roff is not given, ron is the default

Limits: [1e-6 - ] [1e-12 -]

Vector: no no

Vector_Bounds: - -

Null_Allowed: no no

PARAMETER_TABLE:

Parameter_Name: vfwd vrev

Description: "forward voltage" "reverse breakdown voltage"

Data_Type: real real

Default_Value: 0. 1e30

Limits: [0. -] [0. -]

Vector: no no

Vector Bounds: - -

Null_Allowed: yes yes

PARAMETER_TABLE:

Parameter_Name: ilimit revilimit

Description: "limit of on-current" "limit of breakdown current"

Data_Type: real real

Default_Value: 1e30 1e30

Limits: [1e-15 -] [1e-15 -]

Vector: no no

Vector_Bounds: - -

Null_Allowed: yes yes

PARAMETER_TABLE:

Parameter_Name: epsilon revepsilon

Description: "width quadrat. reg. 1" "width quadratic region 2"

Data_Type: real real

Default_Value: 0. 0.

Limits: [0. -] [0. -]

Vector: no no

Vector_Bounds: - -

Null_Allowed: yes yes

PARAMETER_TABLE:

Parameter_Name: rrev

Description: "resistance in breakdown"

Data_Type: real

Default_Value: 0.

Limits: -

Vector: no

Vector_Bounds: -

Null_Allowed: yes

STATIC_VAR_TABLE:

Static_Var_Name: locdata

Data_Type: pointer

Description: "table with constants"

This is a model for a simple diode. Three regions are modelled as linear I(V) curves: Reverse (breakdown) current with Rrev starting at Vrev into the negative direction, Off current with Roff between Vrev and Vfwd and an On region with Ron, staring at Vfwd. The interface between the regions is described by a quadratic function, the width of the interface region is determined by Revepsilon and Epsilon. Current limits in the reverse breakdown (Revilimit) and in the forward (on) state (Ilimit) may be set. The interface is a tanh function. Thus the first derivative of the I(V) curve is continuous. All parameter values are entered as positive numbers. A diode capacitance is not modelled.

Example SPICE Usage:

a1 a k ds1

.model ds1 sidiode(Roff=1000 Ron=0.7 Rrev=0.2 Vfwd=1

+ Vrev=10 Revepsilon=0.2 Epsilon=0.2 Ilimit=7 Revilimit=7)