From Zenith's data sheet, the tunnel diode is a 152-0099-00, which is a
50mA/6pF device. Calculated switching time for this would be faster than
60ps - but it all depends on the layout. Any additional stray capacitance
would slow the time down. It says in the data sheet that it is on a
"circuit board assembly" which could add several pF and a few nH - hence the
specified <200ps rather than anything faster.
It is really neat though - compact and small.
The much larger 067-0513-00 has a diode in a tiny disc-like package (100mA,
6pF - so <30ps), incorporated into a GR air-line - a bit like the way it is
done in the 284. The aim is to make it think it is in a matched
transmission line. It goes like stink with a <30ps fall time (so no
performance degradation from layout) and is battery powered. There is one
on eBay at the moment.
Craig
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-----Original Message-----
From: Cliff Carrie [mailto:cliffcarrie@...]
Sent: 20 March 2004 20:36
To: TekScopes@...
Subject: [TekScopes] Another Tek tunnel diode pulser 017-086 - Manual,
anyone?
I picked up a Tek 017-086 TD pulser a while back. It is self
contained and
about twice the size of its GR connector. Power is from 2 internal coin
cells. Risetime printed on it is <.2ns (200ps). It turns on
automatically
when a 50 ohm termination is present. I put it together with a GR
to BNCm 50
ohm feedthru termination. Plugs directly into a scope input. Of course it
can be put on a probe end with suitable adapters.
No muss, no fuss, no 100 volt input pulses needed.
Does anyone have a manual or data sheet for this pulser? I'm
curious about
flatness and aberrations. What product family was it intended for? It's
faster than most of the pulsers I've seen, except for my Tek 284,
and much
more convenient.
Regards,
Cliff
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