[SI-LIST] : Parallel single-ended traces routed to achieve 35 Ohm controlled impedance

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From: Salvador_Aguinaga@3com.com
Date: Fri Oct 27 2000 - 12:32:55 PDT


Has any one tried to achieve controlled impedance for a single-ended trace by
running two traces in parallel?

==================== GND PLANE
                     DIELECTRIC THICKNESS T1
   +-----+
   |/////| SINGLE TRACE 70 OHMS
   +-----+

                     DIELECTRIC THICKNESS T2 (T2>T1)

==================== GND PLANE

   +-----+
   |/////| SINGLE TRACE 70 OHMS
   +-----+

==================== GND PLANE

Using this trace geometry, if each trace is 70 Ohms relative to its reference
planes, and I tie them together at the ends, will this yield 35 Ohms or
something a little less than half Zo of each trace?

Thanks,
-- žal Aguinaga Jr.
-- 3Com - Carrier Business Networks
-- Mt. Prospect, IL

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