3.8  Voltage Controlled Capacitor

3.8.1  Syntax

Preferred syntax:
.VCCAP label n+ n-- nc+ nc-- expression
Alternate syntax:
Gxxxxxxx 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.