Voltage Controlled Capacitor

## 3.8 Voltage Controlled Capacitor

### 3.8.1 Syntax

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

### 3.8.2 Purpose

Voltage controlled capacitor.

### 3.8.3 Probes

All probes that apply to ordinary capacitors also apply here.

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