Path: ...!Xl.tags.giganews.com!local-4.nntp.ord.giganews.com!nntp.supernews.com!news.supernews.com.POSTED!not-for-mail NNTP-Posting-Date: Wed, 19 Mar 2025 02:01:57 +0000 From: john larkin Newsgroups: sci.electronics.design Subject: Re: 50 ohm termination Date: Tue, 18 Mar 2025 19:01:51 -0700 Message-ID: <5b9ktjlhumttunmu1c372frpvn7g7uf7om@4ax.com> References: <20250317190219.00001b76@dne3.net> <6nbhtjlhlpmqkscehm9nn6mfmuvkai55lo@4ax.com> <20250317195017.00005882@dne3.net> <20250318182942.000039a5@dne3.net> <20250318185944.000070a6@dne3.net> User-Agent: ForteAgent/8.00.32.1272 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 45 X-Trace: sv3-RTrhgoDp8oUBoLe2fUE/ZrjvKymTmSO6UohvaQxYdt/Dij96N5GNNYJwbQlljj0NAuZ1HB213tDMee1!Kp8Lc5JYhwaj8sNhdsLKH2+nqPXU1T7qx/eYHUWUTk4Y6xJTkRXV4xROcL8q1t8cDUiHSY4zTdM6!VtqLpw== X-Complaints-To: www.supernews.com/docs/abuse.html X-DMCA-Complaints-To: www.supernews.com/docs/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 Bytes: 2793 On Tue, 18 Mar 2025 18:59:44 -0400, Toaster wrote: >On Tue, 18 Mar 2025 16:02:45 -0700 >john larkin wrote: > >> On Tue, 18 Mar 2025 18:29:42 -0400, Toaster wrote: >> >> >On Mon, 17 Mar 2025 19:17:13 -0700 >> >john larkin wrote: >> > >> >> On Mon, 17 Mar 2025 19:50:17 -0400, Toaster >> >> 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?