[SI-LIST] Re: Flip Chip Solder Ball inductance
- From: <Aubrey_Sparkman@xxxxxxxx>
- To: <mike_bihan@xxxxxxxxxxxx>, <weirsi@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Tue, 20 Sep 2005 09:03:33 -0500
Han,
Inductance requires knowledge of the complete loop or an assumption of =
the complete current path. Where is the other solder ball?=20
Aubrey Sparkman=20
Enterprise Engineering Signal Integrity Team
Dell, Inc.=20
Aubrey_Sparkman@xxxxxxxx=20
(512) 723-3592
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
On Behalf Of Bi Han
Sent: Tuesday, September 20, 2005 8:55 AM
To: weirsi@xxxxxxxxxx; List` Si
Subject: [SI-LIST] Re: Re: Flip Chip Solder Ball inductance
I guess I could use VIA formula (5*H*ln(4h/d)) to estimate the =
inductance, since that applies to both via and bonding wire. It should =
works fine generally for bump.
=20
Steve: why you think it does not make sense?=20
=20
Maybe its inductance is too low so that trace parasitics start to =
dominate over.
=20
thanks,
Han
=20
steve weir <weirsi@xxxxxxxxxx> =A3=BA
Bi, the inductance of a single ball makes no real sense. If you do =
find=3D20 such a formula, be careful to identify the assumptions about =
the rest of=3D20 the path, and make sure that they also apply to your =
circumstances.
Steve
At 05:25 AM 9/20/2005 -0700, Bi Han wrote:
>Hi:
>
>Is there any quick formula to estimate the solder ball inductance,=20
>given=3D20 the geometric size, such as diameter/height.
>
>thanks,
>Han
>
>
>
>---------------------------------
>=20
>=3DD1=3DC5=3DBB=3DA2=3DC3=3DE2=3DB7=3DD1G=3DD3=3DCA=3DCF=3DE4=3DA3=3DAD=3D=
D6=3DD0=3DB9=3DFA=3DB5=3DDA=3DD2=3DBB=3DBE=3D
>F8=3D
=3DCE=3DDE=3DC0=3DAC=3DBB=3DF8=3DD3=3DCA=3DBC=3DFE=3DC9=3DA7=3DC8=3DC5=3D=
B3=3DAC=3DB4=3DF3=3DD3=3DCA=3DCF=3DE4
> =
=3DD1=3DC5=3DBB=3DA2=3DD6=3DFA=3DCA=3DD6=3DA3=3DAD=3DCB=3DD1=3DCB=3DF7=3D=
A1=3DA2=3DC9=3DB1=3DB6=3DBE=3DA1=3DA2=3DB7=3D
> C0=3D
=3DC9=3DA7=3DC8=3DC5
>
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---------------------------------
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=D1=C5=BB=A2=C3=E2=B7=D1G=D3=CA=CF=E4=A3=AD=D6=D0=B9=FA=B5=DA=D2=BB=BE=F8=
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