NAME_TABLE:

C_Function_Name: cm_summer

Spice_Model_Name: summer

Description: "A summer 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: - -

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 summer 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 then summed, multiplied by the output gain and added to the output offset. This model will operate in DC, AC, and Transient analysis modes.

Example usage:

a2 [1 2] 3 sum1 
.model sum1 summer(in_offset=[0.1 -0.2] in_gain=[2.0 1.0] 
+ out_gain=5.0 out_offset=-0.01)