[SI-LIST] Re: Antw: Embedded uStrip - double check me
- From: "bdempsey85" <bdempsey85@xxxxxxxxxxx>
- To: <weirsp@xxxxxxxxxx>, <RNowak@xxxxxxxxxxxxx>,<si-list@xxxxxxxxxxxxx>
- Date: Thu, 6 Nov 2003 10:16:47 -0600
Steve,
The vendor is using Isola FR406 which has a Dk of 4.29 @ 1GHz. I am not
sure about the coating values he's using.
Anyone have good numbers for LPI soldermask coatings?
Bill
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]
> On Behalf Of steve weir
> Sent: Thursday, November 06, 2003 2:01 AM
> To: RNowak@xxxxxxxxxxxxx; si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: Antw: Embedded uStrip - double check me
>
> What frequency is that Er number at, and frequency is your vendor
using
> for
> his Er value for both the board and the coating?
>
> Regards,
>
>
> Steve.
> At 08:48 AM 11/6/2003 +0100, Robert Nowak wrote:
> >Hello Bill,
> >
> >I calculate your microstrip line with Hyperlynx 7.0 and get Z0 = 53.6
> >ohm.
> >
> >Regards,
> >Robert
> >
> >
> > >>> "bdempsey85" <bdempsey85@xxxxxxxxxxx> 11/06 1:40 >>>
> >I would like a double check on my coated uStrip impedance
> >calculations.
> >I am getting feedback from my PCB fabricator that my numbers are >10%
> >off.
> >
> >Here are the parameters:
> >5 mil wide trace, 0.5 foil with add'l 1oz plating (approx 2.1 mils
> >thickness)
> >4 mil trace to plane, Er ~ 4.3
> >LPI soldermask ~ 0.8 mils thick
> >
> >I compute 51 ohms...how about you?
> >
> >Thanks,
> >Bill
> >
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