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wideband signal generation and analysis (Tektronix)

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elektr0

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Hello,

there is a new class of oscilloscopes from Tektronix, called DIGITAL PHOSPHORE OSCILLOSCOPE (DPO).
With bandwidthes from 4GHz and higher (up to 12 GHz).
E.g. DPO/DSA70000 Series
I am wondering how it is realized. The manual says it is not the normal spectrum analyzer principle (of course).
How do they get 4 GHz down to the baseband in one step.
I dont know any DSP, which is able to digitize 4 GHz at once --- would mean somewhat 8GS/s...

Thanks for any comment. Its quite urgent to me....
 

I think Agilent has for its fastest real time scopes a 20 or even 40GSps acquisition circuits (working in parallel), so why Tektronix would be any different?
 

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    elektr0

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Bandwidth and sampling rate of oscilloscopes are only partly related. The state of the art is about 50 GS/s real-time sampling rate with 15 or 20 GHz analog bandwith at major vendors fastest instruments. Higher analog bandwidths up to 80 GHz are achieved with non-real time sampling scopes.
 

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    elektr0

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