3.10  Voltage Controlled Resistor

3.10.1  Syntax

Device

Gxxxxxxx n+ n– VCR nc+ nc– expression
.VCR label n+ n– nc+ nc– expression

Model (optional)

.model mname TABLE {args}

3.10.2  Purpose

Voltage controlled resistor.

3.10.3  Comments

N+ and n– are the positive and negative element (output) nodes, respectively. Nc+ and nc– are the positive and negative controlling nodes, respectively. Value is the transfactor in ohms per volt.

The simulator will faithfully give you a negative resistor if it seems appropriate. Usually, this part is used with a behavioral modeling function, like PWL, which allows you to specify a table of resistance vs. voltage.

You may specify the value in any of these forms:
  1. A simple value. This is the resistance with 1 volt applied to the control port.

  2. An expression, as described in the behavioral modeling chapter.

  3. A model, as described in the behavioral modeling chapter. The table model describes a table of resistances vs. control voltage.

3.10.4  Probes

The standard probes for all basic elements are all available. See the print command for documentation.