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USB high speed what scope to I use
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on Jan 26, 2007
on Jan 26, 2007 by jkinsley
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I am interested in USB conformance testing. Can you tell me if my 1GHZ digital oscilloscope is good enough to do the test? If not can you recommend the right equipment and software to get setup for testing? How much will this cost me?
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Jan 26, 2007 2:03 PM
The 1GHz scope would be sufficient for LS and FS testing. However for HS (480Mbps) testing a system of 2GHz is required.
The risetime of the HS signal is spec'd at >= 500ps. That means a failure is a risetime faster than 500ps. A scope with a system bandwidth (scope + probe) of 1GHz would have a risetime of 500ps. That means that it would never show a failure.
A 2GHz bandwidth will measure a 300ps risetime with ~10% error.
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