SRF Tech
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Posts: 59
Arizona
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Raduga5, Peter is right, the resistance is dictated, generally by the application. More specifically, your load resistance must match the impedance of the transmission line you are meant to drive, and terminate it (as Bupesh implied). As Peter noted, video applications use 75ohms T-Lines (the type of coax or RCA cable that conveys the signals), most backplanes use 50 ohms trace routes, some chip to chip interconnect use 65 ohms (easy to design in a package). If you do not impedance match the T-line line of your application, welcome to a signal integrity nightmare, and likely a failed design. -Stephen
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