Patent ID: 6269060
Filing Date: 2001-07-31
Classification: G11B

Abstract:
A write pulse adjuster for adjusting a transition in a laser control signal by a precise amount of time comprising:a clock input configured to receive a clock having a clock input period;a coarse delay lock loop having a plurality of coarse delay cells each having a coarse delay period wherein the coarse delay lock loop locks to the clock input and the coarse delay period of the coarse delay cells is set as a first fraction of the clock input period;a fine delay lock loop having a plurality of fine delay cells each having a fine delay period wherein the fine delay lock loop locks to a periodic signal derived from the outputs of successive coarse delay cells and the fine delay period of the fine delay cells is set as a second fraction of the delay of the coarse delay cells; anda variable delay line configured to delay the transition by a selected number of coarse delay periods and a selected number of fine delay periods.