[SI-LIST] Re: Proadlizer - new decap?
- From: "Bart Bouma" <bart.bouma@xxxxxxxxx>
- To: weirsp@xxxxxxxxxx
- Date: Wed, 14 Jan 2004 09:10:07 +0100
Steve,
Yes, I fully agree with this, but in the meantime I received some info
that says that the impedance characteristic of this proadlizer is flat
upto 1GHz (and I assume this is at milli-ohm level ;-) ).
It's a four terminal device, and package seems to be a "wafer" type, with
multiple flat leads protruding.
Until now no plot and picture found.
The claimed ESL-value by NEC-Tokin is indeed 1pH, not 1nH as I assumed in
a note posted yesterday.
But still , after reading this new information, a level that I think is
unpossible to reach, certainly taking in account the mounted inductance.
regards, Bart
steve weir <weirsp@xxxxxxxxxx>
13-01-04 19:39
Sent by: si-list-bounce@xxxxxxxxxxxxx
Please respond to weirsp
To: bart.bouma@xxxxxxxxx
gstokes@xxxxxxxxx
cc: si-list@xxxxxxxxxxxxx
si-list-bounce@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Proadlizer - new decap?
Category:
Bart,
Even if NEC claims 1pH, once the device is mounted, the mounted value will
jump by two orders of magnitude.
Steve.
At 11:30 AM 1/13/2004 +0100, Bart Bouma wrote:
>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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