On 05/18/2012 07:24 AM, Bob Camp wrote: > Hi > > For a 50 ohm buffer, you probably want something like 200 ohms in series > with each output (4 buffers) or 400 ohms (8 buffers).
It may be worthwhile considering the gate output impedance as well. For example, for 5V AC logic driving a 50 ohm line the initial edge from the gate is about 4V - which implies a Zo of about 13 ohms. A 50 ohm buffer with 4 gates would therefore use 187 ohms series resistors. There is an app note attached here that discusses this: http://c-c-i.com/node/107 -- Bob Smither [email protected] ========================================================================== A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed. -- Second amendment to the Constitution of the united States ========================================================================== Circuit Concepts, Inc. 281-331-2744
<<attachment: smither.vcf>>
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