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Optical clock recovery using feedback phase rotator with non-linear compensation

  • US 10,063,367 B1
  • Filed: 04/28/2017
  • Issued: 08/28/2018
  • Est. Priority Date: 04/28/2017
  • Status: Active Grant
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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