## 3.9 Voltage Controlled Admittance

### 3.9.1 Syntax

Preferred syntax:
`.VCG` label n+ n– nc+ nc– expression
Alternate syntax:
`G` xxxxxxx n+ n– VCG nc+ nc– expression

### 3.9.2 Purpose

Voltage controlled admittance.

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