Multi stage oscillator phase alignment scheme

摘要

A method and apparatus for signal phase alignment. A pulse is produced and a reference clock signal having a first frequency with one or more clock edges is produced. An alignment clock signal is generated having the first frequency aligned with the pulse. The first frequency of the alignment clock signal is then realigned with the pulse. The alignment clock signal is generated using the pulse and aligning one of the clock edges of the reference clock signal with the pulse edge. The alignment clock signal is realigned using a plurality of delayed clock signals based on the reference clock signal. Each of the delayed clock signals has one or more edges. The plurality of delayed clock signals are latched based on the pulse and the delayed clock signal having an edge nearest to the pulse is selected.