[SI-LIST] Re: S11 or S21

If your goal is to make a simulation model, the capacitor manufactures have
pretty good free tools to do this.  KEMET, AVX, Dielectric Labs, ATC all
have something and there are probably others.  These tools will also tell
you what the ESL is supposed to be so you'll know if your measurements are
close, and KEMET Spice will export a good high-order SPICE model that has
the resonant and many antiresonant points.

Dennis



-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Istvan Novak
Sent: Friday, May 27, 2005 7:40 AM
To: naren@xxxxxxxxxx
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: S11 or S21


Hello Vrenda,

Try www.x2y.com

Regards,
Istvan



Naren wrote:

>hello steve
>
>I unable to find this site www.xy2.com
>It is jumping to some other site !!!
>
>steve weir said:
>  
>
>>Vrenda,
>>
>>The X2Y web site www.xy2.com has an application note that I wrote for 
>>extracting capacitor parameters.  That method uses S21.
>>
>>A couple of points:
>>
>>1. The smaller the test board the better to extract the ESL of a raw 
>>capacitor.  A 2x2 board will up to 500MHz or so. 2. The simple single 
>>RLC model is overly pessimistic at high frequency.  See the DesignCon 
>>2005 TK7 proceedings.
>>
>>Steve
>>
>>At 11:46 AM 5/26/2005 -0700, Virendra wrote:
>>    
>>
>>>Hello All,
>>>I am trying to measure the esl of a ceramic capacitor.
>>> I have a test board of 2"x 2" for this.  I have SMA connectors 
>>>connected to two sides of the test board. Now to extract the esl of 
>>>the capacitor, is it best to measure the S11 or S21.
>>>Given that S21 gives lesser measurement errors does it
>>>still make sense to measure S21 when the two
>>>connectors are 2" apart?
>>>
>>>thanks in advance,
>>>virendra
>>>
>>>
>>>
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>
>
>  
>

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