Technical Editor Paul Rako looks at analog technology in power supplies, interface, the signal path, and life in general.
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Blog
Thursday, January 1, 2009
Improve TRD sensitivity by varying the excitation pulse widths
Jan 1 2009 11:22AM | Permalink |Comments (2) |
NASA Tech Briefs has an interesting article about improving time domain reflectometry (TDR). By varying the pulse widths you send down the cable or trace, you can improve the sensitivity of the measurement. You use an autocorrelation function to dig the reflected signals out of the noise. This makes perfect sense. The rising and falling pulses make a pair. If the time between the two edges is always the same, then there might be deterministic reflections from other features that obliterate the reflections of interest. By varying the pulse widths you are sweeping those reflections around this noise and thereby getting a signal with more information, which you can then extract with the autocorrelation. You can also check out my article about TDR.
Related entries in: Analog |
Reader Comments
at 1/6/2009 1:46:41 PM, Ron Bauerle said:
You might want to fix that "TRD" typo in the headline...
at 1/8/2009 11:45:48 AM, Will123 said:
The title of the article contains "TRD" instead of "TDR".
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