NAME_TABLE:

C_Function_Name: cm_mult

Spice_Model_Name: mult

Description: "multiplier block"

PORT_TABLE:

Port_Name: in out

Description: "input vector" "output"

Direction: in out

Default_Type: v v

Allowed_Types: [v,vd,i,id,vnam] [v,vd,i,id]

Vector: yes no

Vector_Bounds: [2 -] -

Null_Allowed: no no

PARAMETER_TABLE:

Parameter_Name: in_offset in_gain

Description: "input offset vector" "input gain vector"

Data_Type: real real

Default_Value: 0.0 1.0

Limits: - -

Vector: yes yes

Vector_Bounds: in in

Null_Allowed: yes yes

PARAMETER_TABLE:

Parameter_Name: out_gain out_offset

Description: "output gain" "output offset"

Data_Type: real real

Default_Value: 1.0 0.0

Limits: - -

Vector: no no

Vector_Bounds: - -

Null_Allowed: yes yes

• Description:
  This function is a multiplier block with 2-to-N input ports. Individual gains and offsets can be applied to each input and to the output. Each input is added to its respective offset and then multiplied by its gain. The results are multiplied along with the output gain and are added to the output offset. This model will operate in DC, AC, and Transient analysis modes. However, in ac analysis it is important to remember that results are invalid unless only one input of the multiplier is connected to a node that i connected to an AC signal (this is exemplified by the use of a multiplier to perform a potentiometer function: one input is DC, the other carries the AC signal).

Example SPICE Usage:

a3 [1 2 3] 4 sigmult 
.model sigmult mult(in_offset=[0.1 0.1 -0.1] 
+ in_gain=[10.0 10.0 10.0] out_gain=5.0 out_offset=0.05)