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From: john larkin <jlArbor.com>
Newsgroups: sci.electronics.design
Subject: Re: 50 ohm termination
Date: Tue, 18 Mar 2025 19:01:51 -0700
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On Tue, 18 Mar 2025 18:59:44 -0400, Toaster <toaster@dne3.net> wrote:

>On Tue, 18 Mar 2025 16:02:45 -0700
>john larkin <jl@glen--canyon.com> wrote:
>
>> On Tue, 18 Mar 2025 18:29:42 -0400, 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.
>> 
>> Is the signal some analog thing, or a 10 MHz clock? The THS is an
>> opamp, but they can make good cable drivers too, even for clocks.
>> 
>> Lately I'm enamored of BUF602, a unity-gain 1 GHz beast.
>> 
>
>I had a really hard time finding a good line driver. I might look into
>this chip.
>
>Thank you!

Is your signal analog or digital?