[SI-LIST] Re: Antw: Embedded uStrip - double check me
- From: Paul Levin <levinpa@xxxxxxxxxxxxx>
- To: dhoovy@xxxxxxxxxxxxx
- Date: Mon, 10 Nov 2003 05:20:33 -0800
Dear David,
I've seen a data sheet for PSR4000BV that includes values for 1, 5 and 10 GHz
in addition to the 1 MHz value. Another person in my company obtained it after
filling out a request form on Taiyo America's website.
Regards,
Paul
___________________
David Hoover wrote:
> Bill,
>
> I too wish that I could find good numbers for LPI Soldermask. Unfortunately,
> only a couple of soldermask suppliers give us values in the GHz ranges. One
> of
> the most common used in the US, Taiyo, only has 1 MHz values on their Tech
> Data Sheets. Enthone has some graphs that suggest around ~4.0 value at 1
> GHz.
>
> Has anybody seen better values for Taiyo PSR4000 (LPI Soldermask)?
>
> Regards,
>
> Regards,
> David Hoover
> Sr FAE - Multek
>
> PS-I've been hounding these guys for years on this! I'm just grateful that
> the
> soldermask has a very minor impact on the impedance calculations.
>
> ----- Original Message -----
> From: "bdempsey85" <bdempsey85@xxxxxxxxxxx>
> To: <weirsp@xxxxxxxxxx>; <RNowak@xxxxxxxxxxxxx>; <si-list@xxxxxxxxxxxxx>
> Sent: Thursday, November 06, 2003 8:16 AM
> Subject: [SI-LIST] Re: Antw: Embedded uStrip - double check me
>
>
>
>>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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>>
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>
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>
--
Paul Levin
Senior Principal Engineer
Xyratex Storage Systems
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