Re: [SI-LIST] : on-chip capacitance & core noise

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From: Josip Popovic (popovic@mosaid.com)
Date: Thu Jul 20 2000 - 13:26:54 PDT


Sandy, all,

Any decoupling on IO sections?

Josip

cmos@rockisland.com wrote:
>
> David Chengson wrote:
>
> > Does anyone have some approximate numbers for
> > the amount of on-chip capacitance that has been explicitly
> > added to large commercial or non-commercial chips?
>
> ...
>
> David
>
> I co-authored a paper at Sun Microsystems which was presented
> ISSCC 2000 describing the passive on chip decoupling caps
> and the active circuit used to counter multi cycle effects.
>
> Here are the numbers from that paper:
>
> Passive capacitance added: 176 nF
> Intrinsic chip capacitance: > 80 nF
> On chip regulator capacitance: 134 nF (when deactivated)
> regulator capacitance (switching): 1.6uF
>
> This was for a 1.5V 0.15u CMOS device.
>
> The on chip regulator uses actively switched decoupling capacitors to
> decrease the AC impedance in a band limited range.
> The target band was to cover the region between where the on chip passive
> decoupling caps run out of gas and when the package(...) inductance
> finally allows the current to change.
>
> Keeping the on chip power supply impedance down in the
> single digit mOhms is tough.
>
> I hope this helps you.
>
> Taylor
>
> (360) 376 3815
> CMOS Solutions
> Orcas Island WA.
>
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