[SI-LIST] Re: Capacitors UNDER a BGA??
- From: "Lee Ritchey" <leeritchey@xxxxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx, "Michael Khusid" <mkhusid@xxxxxxxxxx>
- Date: Thu, 30 Jan 2003 08:48:24 -0800
Mike,
It is not necessary to place decoupling capacitors under ICs. Any place on
the surface of the PCB is fine. See Todd Hubing's paper "Power Bus
Decoupling on Multilayer PCBs" published on May 1995 in the IEE Proceedings
on Electromagnetic Compatibility for more information on this. You can
download this paper from the IEEE web site.
Lee
Lee Ritchey
leeritchey@xxxxxxxxxxxxx
Why Wait? Move to EarthLink.
> [Original Message]
> From: Michael Khusid <mkhusid@xxxxxxxxxx>
> To: <si-list@xxxxxxxxxxxxx>
> Date: 1/29/2003 7:01:34 PM
> Subject: [SI-LIST] Re: Capacitors UNDER a BGA??
>
>
> There are sockets made for BGAs. If you have a socket for your BGA, you
> may get enough height to put caps under it.
>
> Also, I am not certain whether you can reliably solder caps under BGA
> without shorting the BGA balls to each other and to the cap.
>
> Best regards,
> Mike
>
> -----------------------------------------------------------------
> Michael Khusid
> Ansoft Corporation
> SI/HF Application Engineer
>
> 25 Burlington Mall Road, 6th floor
> Burlington, MA 01803-4100
>
> Tel 781-229-8900 Ext. 34
> Fax 781-229-8624
> --------------------- http://www.ansoft.com ---------------------
>
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On Behalf Of Grasso, Charles
> Sent: Wednesday, January 29, 2003 7:55 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Capacitors UNDER a BGA??
>
> Hi Si'ers
>
> I am looking for a very thin decoupling cap
> that will fit under a BGA. Is there anyone
> out there that knows of such a device??
>
> Best Regards
> Charles Grasso
> Senior Compliance Engineer
> Echostar Communications Corp.
> Tel: 303-706-5467
> Fax: 303-799-6222
> Cell: 303-204-2974
> Email: charles.grasso@xxxxxxxxxxxx; <mailto:charles.grasso@xxxxxxxxxxxx;
> >
>
> Email Alternate: chasgrasso@xxxxxxxx <mailto:chasgrasso@xxxxxxxx>
>
>
>
>
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