question about SAS2.1r05

Mathieu Gagnon (Montreal) Mathieu_Gagnon at pmc-sierra.com
Fri Jul 16 07:20:25 PDT 2010


* From the T10 Reflector (t10 at t10.org), posted by:
* "Mathieu Gagnon (Montreal)" <Mathieu_Gagnon at pmc-sierra.com>
*
My understanding of this:
S parameters are derived from voltage ratios.
dBs are meant to represent powers or power ratios.
Power is proportional to the square of the voltage, given a fixed
impedance load.
Thus, power ratios will be expressed in dBs as 10*log10(S*S) =
20*log10(S), for fixed impedances.
S parameters are measured over fixed impedances, so this should apply
directly.
I hope this answers your question.
Mathieu
-----Original Message-----
From: owner-t10 at t10.org [mailto:owner-t10 at t10.org] On Behalf Of Justin
Sent: Thursday, July 15, 2010 11:05 PM
To: t10 at t10.org
Subject: question about SAS2.1r05
* From the T10 Reflector (t10 at t10.org), posted by:
* "Justin" <power at uniconn.com.tw>
*
Dear sir,
    Please review the table 23 (page 109) of SAS2.1 r05,
    You can see these statements: (began from SAS2.1 r04b~r05)
    [ 20 x log10(|SCD21|)]-[20xlog10(|SDD21|)]
    ...................(NEXT)........................
    20xlog10(|SDD22|)
    20xlog10(|SCD22|)
    20xlog10(|SCD21|)
    Should these statements to be like this:
    [10xlog10(|SCD21|)]-[10xlog10(|SDD21|)]
    ..................(NEXT)...........................
    10xlog10(|SDD22|)
    10xlog10(|SCD22|)
    10xlog10(|SCD21|)
    Please check, Thank you!
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