CONTROL A VCO's START AND STOP PHASES WITH A SQUELCH INPUT SIGNAL.

A voltage-controlled oscillator (VCO) circuit is presented which can be built up with a squelch feature that can start and stop the oscillations with a predetermined phase. Built with five standard ECL gates and two discrete transistors, it was originally designed for phased-lock-loop operation at frequencies of about 10 to 15 MHz. However, the control voltage can cover a frequency range from audio to VHF with the proper timing capacitor. The upper limit is about 128 MHz.