[SI-LIST] Re: S11 or S21

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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