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US 8,710,883 B1Granted
Phase lock loop with injection pulse control
AssigneeXilinx, Inc.
InventorsWayne Fang, Parag Upadhyaya
Life of this patent
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Abstract
An apparatus comprises a lock-loop circuit including an oscillator, a frequency detector, a charge pump, and a regulator. The regulator is coupled to provide a regulated signal to the oscillator to control frequency. The oscillator and the frequency detector are coupled to receive a reference clock signal. The reference clock signal is coupled to the oscillator to suppress noise in the oscillator by pulse injection. The frequency detector is coupled to receive an oscillator output from the oscillator.
Claims17
An apparatus, comprising:
- a lock-loop circuit including an oscillator, a frequency detector, a charge pump, and a regulator;
- wherein the regulator is coupled to provide a regulated signal to the oscillator to control frequency;
- wherein the oscillator and the frequency detector are coupled to receive a reference clock signal;
- wherein the reference clock signal is coupled to the oscillator to suppress noise in the oscillator by pulse injection;
- and
- wherein the frequency detector is coupled to receive an oscillator output from the oscillator.
3 more elements
Dependencies are inferred from the claim text.