Method and apparatus for dynamically controlling the timing of signals in automatic test systems
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United States of America Patent
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Apr 11, 1989
Issued Date -
N/A
app pub date -
Oct 28, 1986
filing date -
Aug 1, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Apparatus for delaying an electrical signal includes a sequence of stages, each for delaying the signal. A coarser stage delays the signal by multiples of a predetermined fundamental delay interval and a finer stage provides for fine adjustment of the delay. The fine stage includes an integral number N of delay elements, the total providing a delay interval greater than the fundamental delay interval, whereby the fine delay intervals compensate for fabrication tolerances to enable accurate calibration of the combined system by post-fabrication measurement. In one implementation each delay stage includes a tapped transmission line to provide delay intervals, in another a ramp generator is used.
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