[SI-LIST] Re: 0306 Capacitors
- From: "Istvan NOVAK" <istvan.novak@xxxxxxxxxxxxxxxx>
- To: "steve weir" <weirsp@xxxxxxxxxx>
- Date: Sun, 14 Mar 2004 10:24:49 -0500
Steve,
I think I start to understand where we differ. The ln(R)
term still refers to the cylinder itself. My comment
referred to (but I probably was not clear about it) the
inductance of the pad between the cylinder of via to
the edge/periphery of the pad, or the connection line
of capacitor body, whichever is closer to the via
cylinder. When the cylinder gets bigger, the horizontal
inductance of the same pad gets lower.
Regards,
Istvan
----- Original Message -----
From: "steve weir" <weirsp@xxxxxxxxxx>
To: "Istvan NOVAK" <istvan.novak@xxxxxxxxxxxxxxxx>
Cc: <si-list@xxxxxxxxxxxxx>
Sent: Saturday, March 13, 2004 9:41 PM
Subject: Re: [SI-LIST] Re: 0306 Capacitors
> Istvan, if we apply Biot-Savart, the inductance of the surface
> cross-section grows with diameter. As we increase the diameter, the
> incremental area of each circumference slice gets bigger, helping
> inductance, but the radius also similarly increases. We end-up
integrating
> dr/R which returns a natural log function.
>
> Regards,
>
>
> Steve.
> At 09:12 PM 3/13/2004 -0500, Istvan NOVAK wrote:
> >Steve,
> >
> >Assuming a square pad and a circular via in its center:
> >if we increase the diameter of the via, dont we have
> >a shorter distance from the edge of the pad to the via tube?
> >
> >Regards,
> >Istvan
> >
> >
> >----- Original Message -----
> >From: "steve weir" <weirsp@xxxxxxxxxx>
> >To: "Istvan NOVAK" <istvan.novak@xxxxxxxxxxxxxxxx>
> >Cc: <si-list@xxxxxxxxxxxxx>
> >Sent: Saturday, March 13, 2004 5:34 PM
> >Subject: [SI-LIST] Re: 0306 Capacitors
> >
> >
> > > Sure, looking from the connecting edge of the via pad to the center
where
> > > it meets the top of the tube, the inductance increases with the OD.
It is
> > > a pretty straightforward application of Biot-Savart.
> > >
> > > Regards,
> > >
> > >
> > > Steve.
> > > At 11:24 AM 3/13/2004 -0500, Istvan NOVAK wrote:
> > > >Steve,
> > > >
> > > >I am not sure I agree with your following statement in the context we
> >have
> > > >here
> > > >(connecting component pads to planes). Can you elaborate?
> > > >
> > > >
> > > > > 1) A larger via radius increases the partial inductance on the
surface
> >by
> > > > > ln( radius ).
> > > > >
> > > >
> > > >Regards,
> > > >Istvan
> > >
> > >
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