Four quadrant analog mixer-based delay-locked loop for clock and data recovery
AssigneeAgere Systems Inc.
InventorsFuji Yang, Patrick Larsson
Life of this patent
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Abstract
A delay-locked loop (DLL) and a method of performing clock and data recovery. In one embodiment, the DLL includes: (1) a phase detector that generates a phase difference signal based on a phase comparison between a data signal and a mixer output signal of the DLL and (2) a quadrant controller, coupled to the phase detector, that generates first and second voltage control signals based on the phase difference signal and first and second voltage control signals of the DLL.
Claims20
A delay-locked loop (DLL) having a mixer, comprising:
- a phase detector that generates a phase difference signal based on a phase comparison between a data signal and an output signal from said mixer;
- and
- a quadrant controller, coupled to said phase detector, that generates first and second control signals to said mixer based on said phase difference signal and first and second voltage control signals.
A method of performing clock and data recovery, comprising:
- generating a phase difference signal based on a phase comparison between a data signal and an output signal of a mixer;
- and
- generating first and second control signals to said mixer using a quadrant controller based on said phase difference signal and first and second voltage control signals.
A four quadrant delay-locked loop (DLL), comprising:
- a mixer;
- a phase detector that generates a phase difference signal based on a phase comparison between a data signal and an output signal of a mixer;
- a quadrant controller, coupled to said phase detector, that generates first and second control signals based on said phase difference signal and first and second voltage control signals;
- an amplitude controller, coupled to said quadrant controller, that generates in-phase and quadrature phase control signals based on said first and second control signals and said first and second voltage control signals;
- and
- in-phase and quadrature phase charge pump circuits, coupled to said amplitude controller and said mixer, that generate said first and second voltage control signals based on said in-phase and quadrature phase control signals.
Dependencies are inferred from the claim text.