Single and dual-edge triggered phase error detection

Abstract

An example apparatus includes a phase detector and a phase error detector. The phase detector may set a status signal to indicate status of phase difference between a reference clock and a feedback clock, the feedback clock generated by a clock tracking circuit to track the reference clock. The phase error detector may set an error signal to be proportional to a phase difference between the reference clock and the feedback clock. At least partially responsive to the status signal, the phase error detector to change from triggered only by edges of the reference clock and feedback clock having a first polarity to triggered by edges of the reference clock and feedback clock having the first polarity and by edges of the reference clock and feedback clock having a second polarity, the second polarity different than the first polarity.