Patent ID: 6552617
Filing Date: 2003-04-22
Classification: H03L

Abstract:
A method of controlling an output frequency of a dual-input voltage controlled oscillator relative to a reference frequency where the output frequency of the dual-input voltage controlled oscillator may be controlled at any of a plurality of predetermined operating frequencies, such method comprising the steps of:providing a predetermined first tune control signal and a predetermined second tune control signal for each predetermined frequency of the plurality of predetermined operating frequencies; selecting a predetermined frequency of the plurality of predetermined operating frequencies; coupling the predetermined first tune control signal provided for the selected frequency to a first input of the dual-input voltage controlled oscillator; dividing the output frequency of the dual-input voltage controlled oscillator by a value substantially equal to the predetermined second tune control signal provided for the selected frequency; comparing a phase of the divided output frequency with a phase of the reference frequency; and coupling a phase difference of the compared phases to a second input of the dual-input voltage controlled oscillator.