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Topic: Agilent has oscilloscopes to 63 GHz /160GS/s. How is that possible? (Read 2 times) previous topic - next topic


Agilent separates the "real-time" specs from the repetitive sampling specs.


According to the manual they use custom indium phosphide ICs on the input - seems to be the
fastest semiconductor substrate material available (although it seems the actual devices are
built out of InGaAs built onto an InP surface).

InP technology is touted as being able to reach THz speeds BTW.  Its also the most brittle
semiconductor - don't drop that 'scope!
[ I won't respond to messages, use the forum please ]


Even if you can sample that fast, how do you put test leads on a circuit that is moving at a rate that necessitates that kind of speed?  Seems like the capacitance of any test lead would wreck it.  Crazy stuff.

At microwave frequencies all signals are carried by stripline or microstrip or coax or waveguide or similar,
no issue with capacitance when a correctly terminated transmission line is used.  Yes it is tricky to put test
leads on a circuit, active probes have to have very small dimensions I think, and you'd normally design in test
ports I suspect!  The manual mentions the probes can be upgraded for higher bandwidth in the future...  Shudder
to think how expensive the probes are actually.
[ I won't respond to messages, use the forum please ]


I would love to know how many of these $500K scopes they sell a year and to what companies/individuals. Note normal 10 week delivery estimate, I suspect they build to order rather then ship from inventory.



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