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DIY sampling "scope"

I don't know if anybody still makes switching-type TDs. The manufacturing process was incredible. GPD bought the GE product line, and made TDs for some years, but they are now an electro-optics company.

The "slideback" concept doesn't need to be implemented with TDs. The basic idea is that each sample event delivers a single bit, a flag that is the sign of the (signal-feedback) voltage at the instant of sampling. There are lots of ways to do that. It's inefficient, but that wouldn't matter in many TDR applications... just take a lot of samples.

TDs were cool. Some would generate 25 ps steps, in 1964.

--

John Larkin                  Highland Technology Inc 
www.highlandtechnology.com   jlarkin at highlandtechnology dot com    

Precision electronic instrumentation 
Picosecond-resolution Digital Delay and Pulse generators 
Custom timing and laser controllers 
Photonics and fiberoptic TTL data links 
VME  analog, thermocouple, LVDT, synchro, tachometer 
Multichannel arbitrary waveform generators
Reply to
John Larkin
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idea

the

to

applications...

Those were the 200 mA ones. They all seem to have had about 200 pF of capacitance.

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 USA 
+1 845 480 2058 

hobbs at electrooptical dot net 
http://electrooptical.net
Reply to
Phil Hobbs

Ah, found it. But this is self-triggered, so it can't be used for equivalent time sampling a waveform, only the highest point on the waveform.

You could add a pulse generator to it, but then you need the timing generation, and the pulse generator, which again necessitates an accurate trigger generator. I don't see how this helps.

Tim

--
Deep Friar: a very philosophical monk. 
Website: http://webpages.charter.net/dawill/tmoranwms
Reply to
Tim Williams

Not so.

--

John Larkin Highland Technology Inc

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jlarkin at highlandtechnology dot com

Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators

Reply to
John Larkin

They can do nice eye diagrams on digital data streams.

--

John Larkin                  Highland Technology Inc 
www.highlandtechnology.com   jlarkin at highlandtechnology dot com    

Precision electronic instrumentation 
Picosecond-resolution Digital Delay and Pulse generators 
Custom timing and laser controllers 
Photonics and fiberoptic TTL data links 
VME  analog, thermocouple, LVDT, synchro, tachometer 
Multichannel arbitrary waveform generators
Reply to
John Larkin

I have a Tek TDR/sampler plugin that does exactly that.

Stated to be

Reply to
Fred Abse

Which model? The SD-24 does 17 ps, but uses SRDs.

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 USA 
+1 845 480 2058 

hobbs at electrooptical dot net 
http://electrooptical.net
Reply to
Phil Hobbs

Reply to
John Larkin

7S12. I don't have the manual for the pulser, only the main TDR, but the waveform looks very TD, and it's only 300mV. 
--
"For a successful technology, reality must take precedence  
over public relations, for nature cannot be fooled." 
                                       (Richard Feynman)
Reply to
Fred Abse

Don't know which head you have. The S-50 is a 50mA TD. The S-52 is a TD, but couldn't find the spec in the time I was willing to spend. Probably 50 or 100mA.

Reply to
mike

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