Apparatus and method of switching intervals
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United States of America Patent
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Oct 13, 2009
Grant Date -
Aug 23, 2007
app pub date -
Feb 17, 2006
filing date -
Feb 17, 2006
priority date (Note) -
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Abstract
The present invention provides a way of hysteretic switching for efficiently reducing the heavy switching between two adjacent coarse intervals. The present invention disposes a number of fine intervals to cover a range which is larger than the length of one coarse interval. Each coarse interval comprises some extra fine intervals which are exceeded the boundary of the coarse intervals in one side. The heavy switching will be postponed until the extra fine intervals are used up. In the meantime, the fine calibration unit records the number of extra fine interval which be used. An extra-boundary value will be recorded in the fine calibration unit for determining an initial fine interval in another coarse interval if the heavy switching occurs. It should be noted that the extra-boundary value could be a positive or minus value corresponding to which a forward coarse interval or a backward coarse interval the reference signal drifts into. The present invention also provides a method for reducing heavy switching between two coarse intervals. It is obvious that the probability of the heavy switching occurring will be efficiently decreased by the way of hysteretic switching of the present invention. Furthermore, the mismatch and noises due to the heavy switching between the coarse intervals can be effectively diminished.
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