[SI-LIST] Re: Trace impedance
- From: Doug Brooks <doug@xxxxxxxxxx>
- To: Scott McMorrow <scott@xxxxxxxxxxxxx>, si-list@xxxxxxxxxxxxx
- Date: Tue, 21 Nov 2006 10:06:19 -0800
Except he didn't ask about Zeven.and Zodd .......
He asked about Zdiff and Zcommon and about Zo and Zcommon
At 09:45 AM 11/21/2006, you wrote:
>except in the limiting case when k=0 then Zeven = Zodd
>
>
>Scott McMorrow
>Teraspeed Consulting Group LLC
>121 North River Drive
>Narragansett, RI 02882
>(401) 284-1827 Business
>(401) 284-1840 Fax
>
><http://www.teraspeed.com>http://www.teraspeed.com
>
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>Teraspeed Consulting Group LLC
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>
>Doug Brooks wrote:
>>
>>Actually, the answer is no.
>>
>>Zdiff = 2*Zo(1 - k)
>>Zcommon = .5 * Zo(1 + k)
>>
>>where k is a factor related to the coupling between the traces (and
>>whose limits are between 0 and 1.0).
>>
>>Single-ended impedance and common mode impedance of a differential
>>pair have different meanings.
>>
>>Doug Brooks
>>
>>
>>
>>
>>At 06:48 AM 11/21/2006, you wrote:
>>
>>>
>>>Hello All,
>>> One basic question on differential pair trace
>>>impedance. Is it possible that a differential pair with 100 ohm
>>>differential impedance will have 50 ohm common mode impedance? Are
>>>the single-ended and common mode impedances of a differential pair
>>>has the same meaning?
>>>Thanks and advance,
>>>shekh
>>>
>>>
>>>
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>>
>>
>>____________________________________________________________________________-
>>Check out UltraCAD's differential impedance and skin effect
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>>
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>
>____________________________________________________________________________-
>Check out UltraCAD's differential impedance and
>skin effect calculators at http://www.ultracad.com
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