Method and system for managing a pulse width of a signal pulse

Details Method and system for managing a pulse width of a signal pulse Method and system for managing a pulse width of a signal pulse

2001-05-25

2003-11-25

Callahan, Timothy P. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

C327S173000, C327S174000

Reexamination Certificate

active

06653879

ABSTRACT:

FIELD OF INVENTION
The invention relates to a method and system for managing a pulse width of a signal pulse representative of data to be recorded on a storage medium.
BACKGROUND OF THE INVENTION
In the prior art, multiple delay stages may be used to adjust the pulse width of a signal pulse to provide a desired pulse width for recording on a storage medium (e.g., a magnetic disk). However, the delay stages may not provide uniform delays between neighboring phase intervals, which may result in inaccurate formation of an adjusted pulse width. In one example, a first stage may provide a different resultant delay than a second stage because of differential thermal performance of one or more semiconductors in the respective stages. In another example, the first stage and second stage provide disparate or non-uniform delays between neighboring phases because of manufacturing process variations in fabrication of the first stage versus the second stage. The actual desired pulse width of a digital signal pulse may vary with ambient temperature fluctuations and manufacturing-process variations such that the recording on the storage medium deviates from a desired adjusted pulse width. Accordingly, for reliable recording of data, reading of data, or both, a need exists for accurately determining an adjusted pulse width in a precise manner that minimizes the impact of disparities between delay stages or the number of requisite delay stages.
BRIEF SUMMARY OF THE INVENTION
In accordance with one aspect of the invention, an input signal is received having a period and an input pulse width. The input pulse width of an input signal is adjusted to an output pulse width of an output signal based upon a recording control signal for control of recording on a storage medium. The output signal and the output pulse width is derived from a triggering edge of a first selected signal of a first selected phase and a triggering edge of a second selected signal of a second selected phase in succession. The first selected signal and the second selected signal are selected from an assortment of reference signals that have distinct relative phases to provide the output pulse width of a desired duration. The number of distinct relative phases available for formation of the output pulse width is increased by one or more of the following: delaying, dividing, inverting, and interpolating one or more reference signals.


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