×

Free-running-frequency adjustment circuit for a clock recovery system

  • US 6,608,875 B1
  • Filed: 05/02/2000
  • Issued: 08/19/2003
  • Est. Priority Date: 05/02/2000
  • Status: Expired due to Fees
First Claim
Patent Images

1. In a clock recovery system including a source of a data signal having transitions, and an injection-locked oscillator having a free-running frequency and generating a clock signal, a free-running frequency adjustment circuit, comprising:

  • a transition density detector, coupled to the data signal source, for detecting the density of the transitions in the data signal;

    a phase error detector, for detecting the phase error between the clock signal and the data signal; and

    a correlator, coupled to the transition density detector and the phase error detector, for adjusting the free-running frequency of the local oscillator in response to the correlation between the detected transition density in the data signal and the phase error between the data signal and the injection locked oscillator.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×