Sujet : Re: 50 ohm termination
De : pcdhSpamMeSenseless (at) *nospam* electrooptical.net (Phil Hobbs)
Groupes : sci.electronics.designDate : 18. Mar 2025, 23:46:55
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <vrct4v$3fla0$1@dont-email.me>
References : 1 2 3 4 5
User-Agent : NewsTap/5.5 (iPhone/iPod Touch)
Toaster <
toaster@dne3.net> wrote:
On Mon, 17 Mar 2025 19:17:13 -0700
john larkin <jlArbor.com> wrote:
On Mon, 17 Mar 2025 19:50:17 -0400, Toaster <toaster@dne3.net> wrote:
Thank you for the advice. In my case I have a 10Mhz signal with very
sharp transitions (500ps, 5V) and wanted to make sure I did things
properly.
Interesting. What's generating the 5v signal? Lots of AC and Tiny
Logic chips are that fast, but might strain to drive 50 ohms. We use
several tiny triple buffers in parallel sometimes.
Regular thick-film surface-mount resistors are fine as terminators at
500 ps.
LVDS line receivers are great at the receive end.
I used a THS3111CD. Split up my project into a timing and driver board,
so i have some 50 ohm BNC cables between and wanted to be extra safe
about reflections at these higher frequencies.
Hmm. 5V in 500 ps is pretty good going for a part with 1300 V/us slew. ;)
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC /Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics 
50 ohm termination
Re: 50 ohm termination