Yeah, A small series resistor can interact with the capacitance of the transmission line to limit the slew rate and act as a rudimentary low pass filter. And it still form a match as long as the resistance plus the output impedance of the driver roughly equal the characteristic impedance of the transmission line.
Regards, Jeff Condit ----- Original Message ----- From: "Jon Elson" <[EMAIL PROTECTED]> To: "Jeff Condit" <[EMAIL PROTECTED]>; "Protel EDA Discussion List" <[email protected]> Sent: Friday, January 25, 2008 10:37 AM Subject: Re: [PEDA] Advice needed... > > > Jeff Condit wrote: > >>How many things get clocked along the line? If there is only one then >>series termination at the source works well. If there are multiple things >>to be clocked along the line, then parallel termination at the end is in >>order. >> > Good point, a full impedance match series termination will muck up the > signal > except at the far end. But, far end termination won't help the radiation > (unless it is the > ringing on the line that is causing the radiation.) In some cases, a > small series resistor > at the source can reduce EMI without wrecking the signal characteristics > in the middle. > >> > Jon > > > > -- > No virus found in this incoming message. > Checked by AVG. Version: 7.5.516 / Virus Database: 269.19.11/1243 - > Release Date: 1/25/2008 11:24 AM > > ____________________________________________________________ You are subscribed to the PEDA discussion forum To Post messages: mailto:[email protected] Unsubscribe and Other Options: http://techservinc.com/mailman/listinfo/peda_techservinc.com Browse or Search Old Archives (2001-2004): http://www.mail-archive.com/[EMAIL PROTECTED] Browse or Search Current Archives (2004-Current): http://www.mail-archive.com/[email protected]
