I am not 100% shore but I would think that you would match the 50 ohm impedance. The following web site may be of some interest to you PCB design work. http://www.glencoe.com/ps/ee/williamson/index.html Roy ----- Original Message ----- From: "Damien Cahill" To: Sent: Friday, February 20, 2004 1:55 PM Subject: [EE]: RF Transmission Line PCB Routing > Hi List, > > I have a reasonably simple question. I am currently routing an RF PCB which > uses a 1GHz DDS synthesiser. The RF signals on the board are up to 400MHz > in frequency and obviously I must consider the impedance of any copper > tracks I lay. What I am unsure of though is what impedance should I be > aiming for with these tracks. Should it match the DDS outputs which are all > 50ohm or should it be as low impedance as possible to reduce resistive > losses. I eagerly await the lists omnipotent response. > > Cheers, > Damien Cahill > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > email listserv@mitvma.mit.edu with SET PICList DIGEST in the body > --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.592 / Virus Database: 375 - Release Date: 18/02/2004 -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu