[SI-LIST] Re: Proadlizer - new decap?

Hi Geoff,
my guess is it's not 1pH. but 1nH.
Obtaining 1pH seems impossible to me, even with e.g. IDC- and X2Y-caps, 
which incorporate magnetic flux cancelation, one doesn't obtain such low 
values.
These typically have ESL-values of 50 upto 100pH.

I assume (....)  this Proadlizer is a new development low-esr polymer 
capacitor (like Nec-Tokin's tantalum Neocapacitor with conductive polymer 
cathode).
It probably is in a compact, having a low profile, package offering lower 
ESL-values than standard tantalum-caps do.
Standard Tantalums offer typical ESL values of 2.0 - 2.5 nH (case size D)
In this context 1nH can be considered a low ESL-value, certainly when 
offering a capacitance of 200uF.

regards, Bart
www.yageo.com

============================================================



I found this and only this, after searching a while for descriptive info:

http://www.nec-tokin.com/english/top/news.cgi?mode=body&id=14

For once, Google did not help!

My guess is it's not really a conventional 2-terminal capacitor.  By 
analogy
with 4-terminal resistors with Kelvin connections, there are devices which
can give you very low ESL (1pH claimed in this case).  But they are really
filters with 3 or more terminals.  The RF community has long used 
discoidal
feed-thro capacitors for GHz decoupling, which are best seen as 3 terminal
devices.  The ground connection around the edge of the disc is possibly 
the
lowest common impedance ever (that is the amplitude of Z12 for network
enthusiasts).  But no such device can produce such a low driving-point
impedance at a single port (Z11) without impractical dimensions.

> -----Original Message-----
> From: Mark Alexander [mailto:mark.alexander@xxxxxxxxxx]
> Sent: 12 January 2004 22:48
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Proadlizer - new decap?
> 
> 
> Hey all,
> 
> On the subject of new capacitor technologies, does anyone have 
> information on NEC's Proadlizer?  Apparently the name is a 
> contraction 
> of Prompt, Broadband Stabilizer.  I can't find much press on it.
> 
> -mark
> 
> 
> 
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