[SI-LIST] Re: Controlled impedance PCB question
- From: C Deibele <deibele@xxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Thu, 19 Jul 2001 15:24:05 -0400
Allan Davidson wrote:
>
> Hi guys:
> If I wanted a PCB with two different values of controlled impedance, say
> some 50 ohm traces and some 40 ohm traces, is this relatively easy to
> design and fabricate, or would I end up paying a lot more for both the
> design of the board and production quantities?
>
> Also, is this fairly common, a board with multiple values of controlled
> impedance traces?
>
> Appreciate any insight.
> Thanks, Allan
No Problem Allan.
The impedance is a function of the trace width. I routinely make traces
of 20 ohms up to 100 ohms. Note that it can be difficult to achieve
certain impedances because of your particular geometry (the higher ones
are usually the hardest to hit)
Craig
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