Voltage controlled oscillator and semiconductor IC device including a voltage controlled capacitor

摘要

A voltage controlled oscillator (VCO) having an amplifier including a field-effect transistor (FET). The VCO includes a voltage controlled capacitor having an inversion amplifier including an FET, an amp gain of the inversion amplifier being controlled by a voltage; and a capacitor connected between an input and an output of the inversion amplifier.