System for measuring characteristics of a digital signal
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United States of America Patent
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Aug 5, 2008
Grant Date -
Mar 30, 2006
app pub date -
Sep 30, 2004
filing date -
Sep 30, 2004
priority date (Note) -
Expired
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Abstract
An electronic device under test (DUT) responds to a digital input signal by generating a digital DUT output signal conveying a repetitive digital signal pattern. An apparatus for measuring various characteristics of the DUT output signal includes a trigger generator for generating a series of trigger signal edges in response to selected DUT output signal edges occurring during separate repetitions of the digital signal pattern. The trigger generator can be configured to generate each trigger signal edge in response to the same or a different edge of the digital signal pattern. The apparatus determines when a DUT output signal edge occurs by determining when the DUT output signal rises above or falls below adjustable reference voltages. The apparatus alternatively responds to each trigger signal edge by measuring a period between two different edges of the digital signal pattern and or by repetitively sampling the DUT output signal to determine its state.
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