Sujet : Re: Fast sampler
De : pcdhSpamMeSenseless (at) *nospam* electrooptical.net (Phil Hobbs)
Groupes : sci.electronics.designDate : 06. Mar 2025, 02:10:08
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <6aac874a-8283-026b-1af5-33295c858e67@electrooptical.net>
References : 1 2 3 4
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On 2025-03-05 20:07, Joerg wrote:
On 3/5/25 5:00 PM, Phil Hobbs wrote:
On 2025-03-05 19:15, john larkin wrote:
On Wed, 5 Mar 2025 18:20:47 -0500, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:
>
Hi, All,
>
Late last year we did a fast sampler/TDR with nice clean 60 ps edges.
>
We're gearing up to actually sell them, so I did a short technical
writeup on the design, which may be of interest.
>
<https://electrooptical.net/News/a-high-performance-time-domain-reflectometer> >
>
>
Neat. No step-recovery diodes.
>
Well, 40 years does get you something sometimes. ;)
>
And those cheap yet blazingly fast RF transistors, thanks to cell phones and all. They make nice pulsers. But they are like the princess on the pea, very low Vce and if you go a smidgen above ... poof.
[...]
They're not that bad, really--their betas are so high that BV_CEO is lowish, but BV_CBO is 12 volts or more. Their saturation behavior is still pretty BJTish, though. ;)
Cheers
Phil Hobbs
-- Dr Philip C D HobbsPrincipal ConsultantElectroOptical Innovations LLC / Hobbs ElectroOpticsOptics, Electro-optics, Photonics, Analog ElectronicsBriarcliff Manor NY 10510
http://electrooptical.nethttp://hobbs-eo.com
Fast sampler
Re: Fast sampler