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1. IN5399/DELNP/2014 - METHOD FOR LOCKING A DELAY LOCKED LOOP

Office
India
Application Number 5399/DELNP/2014
Application Date 30.06.2014
Publication Number 5399/DELNP/2014
Publication Date 27.03.2015
Publication Kind A
IPC
H03L 7/081
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
LAUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
7Automatic control of frequency or phase; Synchronisation
06using a reference signal applied to a frequency- or phase-locked loop
08Details of the phase-locked loop
081provided with an additional controlled phase shifter
Applicants ADVANCED MICRO DEVICES INC.
Inventors SEARLES Shawn
Priority Data 13529671 21.06.2012 US
61/581748 30.12.2011 US
Title
(EN) METHOD FOR LOCKING A DELAY LOCKED LOOP
Abstract
(EN) A method and apparatus for synchronizing a delay line to a reference clock includes a delay line that receives a clock input signal based on a reference clock and outputs a delay edge signal according to a control adjustment. An injector receives a first rise edge of the reference clock and in response to a first trigger sends the clock input signal to the delay line. A synchronizer determines that the rise edge has passed through the delay line and in response sends the injector a second trigger to send a next single fall edge of the clock input signal to the delay line. A charge pump determines a timing difference between the delay edge signal and a reference edge signal sent from the injector. The charge pump sends the control signal to the delay line to adjust the delay setting of the delay line based on the timing difference.