Yup. "The Tunnel Diode Slideback Sampling Oscilloscope." I might revisit the concept one day soon.
-- John Larkin Highland Technology, Inc picosecond timing laser drivers and controllers jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
I have a bag full. I think you do, too. Unfortunately mine are all 2 mA peak current, which makes them about 100 times too slow to be interesting. (Their capacitance is something ridiculous like 200 pF.)
It was the >100 mA ones that were fast.
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 hobbs at electrooptical dot net http://electrooptical.net
Mine are in the 7 mA range, something like 2 ns Trr. The 25 ps parts were, as you say, in the 100-200 mA range.
Halted had a bin full of them and were asking 10 cents each. I should have bought the entire bin. Not that I really have a use for them.
I can buy a CML or ECL gate or comparator now, with 40 ps rise/fall times, and it's a lot more useful than a tunnel diode. But in ca 1965, anything that made a 25 ps edge was amazing.
There are some really fast logic gates around now, 10 ps stuff, unaffordable.
-- John Larkin Highland Technology, Inc picosecond timing laser drivers and controllers jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
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