Clock phase synchronization
AssigneeQUALCOMM Incorporated
InventorsMinghsien TSAI, Chia Heng CHANG, Yu SONG, Younwoong CHUNG
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Abstract
A method for phase alignment includes sampling a receive signal using a first clock signal to generate a data signal, receiving multiple clock signals, wherein the multiple clock signals include the first clock signal, mixing two of the multiple clock signals to generate a mixer clock signal, and sampling the receive signal using the mixer clock signal to generate a measurement signal. The method also includes detecting a phase difference between the first clock signal and the mixer clock signal, and adjusting a phase of the mixer clock signal in a direction that reduces the phase difference between the first clock signal and the mixer clock signal.
Claims20
A receiver, comprising:
- a data sampler having a signal input, a clock input, and an output, wherein the clock input of the data sampler is configured to receive a first clock signal;
- a mixer, wherein the mixer is configured to:
- receive multiple clock signals, wherein the multiple clock signals include the first clock signal;
- and
- mix two of the multiple clock signals to generate a mixer clock signal;
- a measurement sampler having a signal input, a clock input, and an output, wherein the clock input of the measurement sampler is configured to receive the mixer clock signal;
- a phase detection circuit configured to:
- receive the first clock signal and the mixer clock signal;
- and
- generate a phase error signal indicating a phase difference between the first clock signal and the mixer clock signal;
- and
- a control circuit coupled to the phase detection circuit and the mixer, wherein the control circuit is configured to:
- receive the phase error signal;
- and
- cause the mixer to adjust a phase of the mixer clock signal in a direction that reduces the phase difference between the first clock signal and the mixer clock signal.
A method for phase alignment, comprising:
- sampling a receive signal using a first clock signal to generate a data signal;
- receiving multiple clock signals, wherein the multiple clock signals include the first clock signal;
- mixing two of the multiple clock signals to generate a mixer clock signal;
- sampling the receive signal using the mixer clock signal to generate a measurement signal;
- detecting a phase difference between the first clock signal and the mixer clock signal;
- and
- adjusting a phase of the mixer clock signal in a direction that reduces the phase difference between the first clock signal and the mixer clock signal.
Dependencies are inferred from the claim text.