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US 7,679,453 B2Granted
Phase-locked loop capable of dynamically adjusting phase of output signal according to detection result of phase/frequency detector, and method thereof
AssigneeRealtek Semiconductor Corp.
InventorShaw-N Min
Life of this patent
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Abstract
A phase-locked method includes: generating a selection signal according to a detection result of a phase/frequency detector (PFD) of a phase-locked loop (PLL); generating a plurality of oscillation signals according to at least a first oscillation signal generated by the PLL, wherein the plurality of oscillation signals respectively correspond to a plurality of phases; and from the plurality of oscillation signals, selecting an oscillation signal as an output signal of the PLL according to the selection signal.
Claims14
A phase-locking method comprising:
- generating a selection signal according to a detection result of a phase/frequency detector of a phase-locked loop, wherein the detection result comprises a first detection signal and a second detection signal;
- synthesizing the first detection signal and the second detection signal to generate a synthesized signal;
- quantizing the synthesized signal;
- performing a calculation upon the quantized synthesized signal to generate the selection signal;
- generating a plurality of oscillation signals according to at least a first oscillation signal generated by the phase-locked loop, wherein the plurality of oscillation signals respectively correspond to a plurality of phases;
- and
- from the plurality of oscillation signals, selecting an oscillation signal as an output signal of the phase-locked loop according to the selection signal.
4 more elements
A phase-locked loop comprising:
- a phase/frequency detector, for generating a detection result according to an input signal;
- an oscillator, coupled to the phase/frequency detector, for generating at least a first oscillation signal according to the detection result;
- an oscillation signal generator, coupled to the oscillator, for generating a plurality of oscillation signals according to the first oscillation signal, wherein the plurality of oscillation signals respectively correspond to a plurality of phases;
- and
- a selection signal generator, coupled to the phase/frequency detector and the oscillation signal generator, for generating a selection signal according to the detection result, wherein the detection result comprises a first detection signal and a second detection signal, and the selection signal generator comprises:
- a synthesizing unit, for synthesizing the first detection signal and the second detection signal to generate a synthesized signal;
- a quantizer, coupled to the synthesizing unit, for quantizing the synthesized signal;
- and
- a computation unit, coupled to the quantizer, for performing calculation upon the quantized synthesized signal to generate the selection signal;
- wherein the oscillation signal generator selects an oscillation signal from the plurality of oscillation signals as an output signal of the phase-locked loop according to the selection signal.
7 more elements
Dependencies are inferred from the claim text.