Optical clock recovery using feedback phase rotator with non-linear compensation
First Claim
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1. A system, comprising:
- a phase locked loop (PLL) device that comprisesan analog phase detector configured to obtain a reference signal, anda voltage-controlled oscillator (VCO) device, wherein the VCO device is configured to generate, based on the reference signal, an output signal;
a phase rotator coupled to the VCO device and the analog phase detector;
a first digital phase detector coupled to the VCO device, the first digital phase detector configured to determine an amount of phase difference between a transmitter clock signal and the output signal; and
a first digital accumulator coupled to the first digital phase detector,wherein the phase rotator and the first digital accumulator are configured, using the amount of phase difference between the transmitter clock signal and the output signal, to filter a portion of the amount of phase difference from the output signal to generate a filtered signal for transmission to the analog phase detector,wherein the phase rotator is configured to generate an in-phase (I) phase signal and a quadrature (Q) phase signal, andwherein the phase rotator is configured to implement a non-linear compensation scheme based on a mismatch of the I phase signal and the Q phase signal.
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Abstract
A method for clock recovery that may include obtaining an output signal from a phase locked loop (PLL) device. The method may further include determining, using a digital phase detector, the output signal, and a transmitter clock signal, an amount of phase difference between the output signal and the transmitter clock signal. The method may further include filtering, using a phase rotator and a digital accumulator, a portion of the amount of phase difference from the output signal to generate a filtered signal.
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Citations
18 Claims
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1. A system, comprising:
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a phase locked loop (PLL) device that comprises an analog phase detector configured to obtain a reference signal, and a voltage-controlled oscillator (VCO) device, wherein the VCO device is configured to generate, based on the reference signal, an output signal; a phase rotator coupled to the VCO device and the analog phase detector; a first digital phase detector coupled to the VCO device, the first digital phase detector configured to determine an amount of phase difference between a transmitter clock signal and the output signal; and a first digital accumulator coupled to the first digital phase detector, wherein the phase rotator and the first digital accumulator are configured, using the amount of phase difference between the transmitter clock signal and the output signal, to filter a portion of the amount of phase difference from the output signal to generate a filtered signal for transmission to the analog phase detector, wherein the phase rotator is configured to generate an in-phase (I) phase signal and a quadrature (Q) phase signal, and wherein the phase rotator is configured to implement a non-linear compensation scheme based on a mismatch of the I phase signal and the Q phase signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus, comprising:
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a phased locked loop (PLL) device; and a processing system coupled to the PLL device, wherein the processing system is configured to obtain a first output signal from the PLL device, determine, using a first digital phase detector, the first output signal, and a transmitter clock signal, an amount of phase difference between the first output signal and the transmitter clock signal, and filter, using a phase rotator and a first digital accumulator, a portion of the amount of phase difference from the output signal to generate a filtered signal, wherein the phase rotator is configured to generate an in-phase (I) phase signal and a quadrature (Q) phase signal, and wherein the phase rotator is configured to implement a non-linear compensation scheme based on a mismatch of the I phase signal and the Q phase signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method for clock recovery, comprising:
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obtaining an output signal from a phase locked loop (PLL) device; determining, using a digital phase detector, the output signal, and a transmitter clock signal, an amount of phase difference between the output signal and the transmitter clock signal, and filtering, using a phase rotator and a digital accumulator, a portion of the amount of phase difference from the output signal to generate a filtered signal, wherein the phase rotator is configured to generate an in-phase (I) phase signal and a quadrature (Q) phase signal, and wherein the phase rotator is configured to implement a non-linear compensation scheme based on a mismatch of the I phase signal and the Q phase signal.
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Specification