×

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

  • US 10,187,197 B2
  • Filed: 07/23/2018
  • Issued: 01/22/2019
  • Est. Priority Date: 04/28/2017
  • Status: Active Grant
First Claim
Patent Images

1. A receiver apparatus, comprising:

  • a phase locked loop (PLL) device that includesan analog phase detector configured to receive 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 digital phase detector coupled to the VCO device, the digital phase detector configured to determine an amount of phase difference between a transmitter clock signal and the output signal;

    a digital accumulator coupled to the digital phase detector, wherein the phase rotator and the 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; and

    a lookup table circuit coupled to the digital accumulator,wherein the lookup table circuit is configured to generate a control signal based on a value of the amount of phase difference between the transmitter clock signal and the output signal, andwherein the control signal is configured to produce, using the phase rotator, a predetermined phase shift in the filtered signal provided as a feedback signal within the PLL device.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×