Phase-locked loop circuit as well as a voltage-controlled oscillator as used in a phase-locked loop circuit
AssigneeAgere Systems Inc.
InventorYanling Sun
Life of this patent
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Abstract
A phase-locked loop circuit comprises a voltage-controlled oscillator with at least one resonator circuit for driving the oscillator to an output frequency which is a multiple of the resonator frequency. The voltage-controlled oscillator is connected to a phase-locked loop comprising frequency control means for controlling the output frequency of the oscillator. According to the invention the resonator circuit comprises at least one adjustable component and the frequency control means are coupled into the resonator circuit for controlling the resonator frequency of the resonator circuit. The invention moreover relates to a voltage-controlled oscillator as used in this phase-locked loop circuit.
Claims9
Phase-locked loop circuit comprising:
- a voltage-controlled oscillator which includes at least one resonator circuit for driving the oscillator;
- a phase-locked loop including frequency control means for controlling the output frequency of said oscillator, such that during operation said resonator circuit runs at a resonator frequency to drive said oscillator at an oscillator output frequency which is an integer multiple greater than one of the resonator frequency;
- wherein the resonator frequency is coupled to the frequency control means of the phase-locked loop, and wherein the resonator circuit includes at least one adjustable component to control the resonator frequency.
Dependencies are inferred from the claim text.