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Method and apparatus for data density-independent phase adjustment in a clock and data recovery system

  • US 7,184,511 B2
  • Filed: 02/17/2005
  • Issued: 02/27/2007
  • Est. Priority Date: 01/17/2003
  • Status: Active Grant
First Claim
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1. A clock and data recovery system comprises:

  • a phase detector operably coupled to receive high data rate serial data and to recover even and odd data from the high data rate serial data based on a divided clock and to produce phase information and transition information based on the recovered even and odd data;

    a lock phase adjust charge pump operably coupled to receive the phase information and transition information and to produce a current signal responsive to the phase information and transition information, wherein the lock phase adjust charge pump includes;

    a phase charge pump driven by the phase information;

    a transition charge pump driven by the transition information, the transition charge pump further including a programmable transition current sink;

    a programmable DC bias current sink; and

    at least two programmable offset bias current sinks;

    a loop filter for converting the current signal to a control voltage signal;

    a voltage controlled oscillator for producing a clock signal to the phase detector based on the control voltage signal;

    a divider operably coupled to receive the clock signal and to produce the divided clock to the phase detector; and

    control logic operable coupled to adjust the programmable transition current sink, the programmable DC bias current sink, and the at least two programmable offset bias current sinks over a plurality of n-bit buses.

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