NAME_TABLE:

C_Function_Name: cm_adc_bridge

Spice_Model_Name: adc_bridge

Description: "analog-to-digital node bridge"

PORT_TABLE:

Port Name: in out

Description: "input" "output"

Direction: in out

Default_Type: v d

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

Vector: yes yes

Vector_Bounds: - -

Null_Allowed: no no

PARAMETER_TABLE:

Parameter_Name: in_low

Description: "maximum 0-valued analog input"

Data_Type: real

Default_Value: 1.0

Limits: -

Vector: no

Vector_Bounds: -

Null_Allowed: yes

PARAMETER_TABLE:

Parameter_Name: in_high

Description: "minimum 1-valued analog input"

Data_Type: real

Default_Value: 2.0

Limits: -

Vector: no

Vector_Bounds: -

Null_Allowed: yes

PARAMETER_TABLE:

Parameter_Name: rise_delay fall_delay

Description: "rise delay" "fall delay"

Data_Type: real real

Default_Value: 1.0e-9 1.0e-9

Limits: [1.0e-12 -] [1.0e-12 -]

Vector: no no

Vector_Bounds: - -

Null_Allowed: yes yes

• Description:
  The adc_bridge is one of two node bridge devices designed to allow for the ready transfer of analog information to digital values and back again. The second device is the dac_bridge (which takes a digital value and maps it to an analog one). The adc_bridge takes as input an analog value from an analog node. This value by definition may be in the form of a voltage, or a current. If the input value is less than or equal to in_low, then a digital output value of `0' is generated. If the input is greater than or equal to in_high, a digital output value of `1' is generated. If neither of these is true, then a digital `UNKNOWN' value is output. Note that unlike the case of the dac_bridge, no ramping time or delay is associated with the adc_bridge. Rather, the continuous ramping of the input value provides for any associated delays in the digitized signal.

Example SPICE Usage:

abridge2 [1] [8] adc_buff

.model adc_buff adc_bridge(in_low = 0.3 in_high = 3.5)