[SI-LIST] Re: Controlled impedance PCB question

Allan,

It's getting to be more and more common to have
multiple impedance requirements on the same layer.
Just the other day I modeled and 18 lyr PCB that had 6
impedance combinations on 4 of those 18 layers
(differential included). 

Dave Hoover
McCurdy Circuits
--- Allan Davidson <allan.davidson@xxxxxxxxxxxxxxx>
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
>
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