From: John Larkin
Subject: Re: Binary Sampler
Date: Thu, 16 Jan 2003 13:15:31 -0800
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On Thu, 16 Jan 2003 14:03:19 -0500, Mike Monett
>Mike Monett wrote:
>> An example is one by Hubert Houtman, "1-GHz Sampling Oscilloscope",
>> Unfortunately, the technology doesn't scale well. 5 GHz would be
>> extremely difficult, 10 GHz would be impossible.
>I forgot about the Metelics 22GHz parts at
>Now, all you need is a picosecond jitter time base:)
I met Agoston Agoston (of Hyperlabs; he did a lot of the Tek SD-series
sampling heads, and worked on the new PSPL thing) at a Wescon show,
some years back. He showed me a 20 GHz traveling-wave sampler (with
timebase) he did with surface-mount parts on an ordinary FR4 pc board.
The timebase isn't that bad, as long as you don't need extreme
jitter-to-delay ratios. One part in 30,000, with maybe a 2 ps RMS
floor, is fairly easy with a simple ramp/comparator. There is a whole
class of signals that can't be usably acquired with a heterodyne
timebase or with an averaging sampler.
Following the dot-com/fiberoptics telecom bust, sampling scopes are a
glut on the used market. I now have *six* 11801/2 scopes. A few weeks
ago, there was an 11802 for sale on ebay, and I bid $300, almost as a
joke... and got it! I've always wanted to do a PC-based sampler/TDR
box, but now is *not* the time to try to sell something like that.