[SI-LIST] Re: Trace impedance
- From: "Grasso, Charles" <Charles.Grasso@xxxxxxxxxxxx>
- To: <dave.instone@xxxxxxxxxx>, <doug@xxxxxxxxxx>
- Date: Wed, 22 Nov 2006 13:04:34 -0700
Dave - Can you please send me the jpeg?
Polar's Si6000 does have a slight deficiency=20
(now corrected in their 8000/9000 series) in that
it cannot properly solve for multilayered dielectrics (such
as solder mask/prepreg).=20
Best Regards
Charles Grasso
Compliance Engineer
Echostar Communications Corp.
Tel: 303-706-5467
Fax: 303-799-6222
Cell: 303-204-2974
Pager/Short Message: 3032042974@xxxxxxxxx
Email: charles.grasso@xxxxxxxxxxxx
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of David Instone
Sent: Wednesday, November 22, 2006 2:18 AM
To: doug@xxxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Trace impedance
Actually Doug unless Polars Si6000 impedance calculator is wrong the=20
answer is yes.
trace width 11.97/12.97 mils, separation 5.323 mils, 1.2 mil thick, 16=20
mils above plane, Er 4.2
Differential impedance 100 ohms, Z odd 50, Z even 99.99 Zcommon 50
I've attached a jpeg screenshot, which the list will strip off, but you
should get it.
Dave Instone
Oxford Semiconductor Ltd
25 Milton Park
Abingdon
Oxon ox14 4sh
UK
www.oxsemi.com
+44 (0)1235 824963
Doug Brooks wrote:
> Actually, the answer is no.
>
> Zdiff =3D 2*Zo(1 - k)
> Zcommon =3D .5 * Zo(1 + k)
>
> where k is a factor related to the coupling between the traces (and=20
> whose limits are between 0 and 1.0).
>
> Single-ended impedance and common mode impedance of a differential=20
> pair have different meanings.
>
> Doug Brooks
>
>
>
>
> At 06:48 AM 11/21/2006, you wrote:
> =20
>> Hello All,
>> One basic question on differential pair trace=20
>> impedance. Is it possible that a differential pair with 100 ohm=20
>> differential impedance will have 50 ohm common mode impedance? Are=20
>> the single-ended and common mode impedances of a differential pair=20
>> has the same meaning?
>> Thanks and advance,
>> shekh
>>
>>
>>
>> __________________________________________________________
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>
>
________________________________________________________________________
____-
> Check out UltraCAD's differential impedance and skin effect=20
> calculators at http://www.ultracad.com=20
>
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> =20
-- Binary/unsupported file stripped by Ecartis --
-- Type: image/jpeg
-- File: common.jpg
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=20
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