There are two general techniques under the heading of voltage scaling. DVS or dynamic voltage scaling does this in kind of an open loop way- vary the voltage and clock with kind of lookup table. AVS or adaptive voltage scaling is closed loop, they have a kind of a small model of the process on chip that they can play with V and F (like a ring oscillator driving a counter, etc.). This was called CPE, critical path emulation. We had a group at Maxim that was trying to do similar things in the analog/mixed signal domain. Current is just CVF + leakage. Leakage is generally small portion but at low frequencies becomes significant. You can play substrate tricks to reduce leakage, then its just C, V and F. You have more control of C than you’d think, you can turn off big blocks when not in use- V and F is what’s left. Regards, John M. Wettroth E: j...@mindspring.com M: (919) 349-9875 H: (984) 329-5420 From: Peter Soper <p...@soper.us> Sent: Monday, August 28, 2023 8:37 PM To: Mike Lisanke <mikelisa...@gmail.com> Cc: John Wettroth <j...@mindspring.com>; Triangle Embedded Interest Group <triembed@triembed.org> Subject: Re: [TriEmbed] Novel approach for low power logic from Intel The novelty to me was the frequency being varied across a 300X range as the PS voltage was varied across a 5X range on the fly. I'd heard of very low supply voltages but not the dynamism. Pete Aug 28, 2023 8:32:49 PM Mike Lisanke <mikelisa...@gmail.com <mailto:mikelisa...@gmail.com> >: Good catch on date! I didn't understand because there's So Much Energy Harvest technology that running a chip on a solar cell (2 sq in?) seemed ridiculously easy to me. I didn't read much further into the article thinking there was a mistake Or something unique. I don't know what size chip can boot/work with Just RF harvest but there's many. On Mon, Aug 28, 2023 at 8:15 PM Peter Soper via TriEmbed <triembed@triembed.org <mailto:triembed@triembed.org> > wrote: Ugh. Sorry.
Aug 28, 2023 5:23:42 PM John Wettroth <j...@mindspring.com <mailto:j...@mindspring.com> >: > Just noticed that the press release was from 2012- DOH! Oh well. > > > Regards, > John M. Wettroth > E: j...@mindspring.com <mailto:j...@mindspring.com> > M: (919) 349-9875 > H: (984) 329-5420 > > -----Original Message----- > From: TriEmbed <triembed-boun...@triembed.org > <mailto:triembed-boun...@triembed.org> > On Behalf Of John Wettroth via > TriEmbed > Sent: Monday, August 28, 2023 4:49 PM > To: 'Pete soper' <p...@soper.us <mailto:p...@soper.us> >; 'Triangle Embedded > Interest Group' > <triembed@triembed.org <mailto:triembed@triembed.org> > > Subject: Re: [TriEmbed] Novel approach for low power logic from Intel > > I'm surprised that Intel is claiming this as really novel. The Claremont > Architecture mentioned was being talked about as the IA in 2012. It grew out > of > the Atom processors that ran in this near threshold/sub threshold region. > Lot > of companies have used techniques like this for decades. Most digital stuff > that runs at these absurd low voltages is subthreshold or near. The very low > power Microchip (nanoWatt XLP) parts use these techniques. Intel's FINFET > operate below .7v already. There was a startup called SuVolta that was based > on > these techniques- it disappeared (acquired or folded?) about five years ago. > Freescale had some dynamic power stuff that played games with the "body" or > substrate connection to modulate threshold voltage. It let them make parts > that > operate in strong inversion at high speeds with higher class A type leakage > currents but could downshift to a slower, low leakage mode by manipulating > the > body voltage. They could do this on the fly- don't know what happened to it- > good fodder for ISSC conferences of the day. Press releases are written by > investor relations guys that don't have a firm handle on the technology and > mainly into promotion. Ironically, the old 40 or so nm process nodes were > much > better in these respects. I think 7 nm might have overshot the mark. > > Take Care- > > Regards, > John M. Wettroth > E: j...@mindspring.com <mailto:j...@mindspring.com> > M: (919) 349-9875 > H: (984) 329-5420 > > Searchable email archive available at > https://www.mail-archive.com/triembed@triembed.org/ > > > _______________________________________________ > Triangle, NC Embedded Interest Group mailing list > > To post message: TriEmbed@triembed.org <mailto:TriEmbed@triembed.org> > List info: http://mail.triembed.org/mailman/listinfo/triembed_triembed.org > TriEmbed web site: https://TriEmbed.org > To unsubscribe, click link and send a blank message: > mailto:unsubscribe-triem...@bitser.net > <mailto:unsubscribe-triem...@bitser.net> ?subject=unsubscribe > Searchable email archive available at > https://www.mail-archive.com/triembed@triembed.org/ _______________________________________________ Triangle, NC Embedded Interest Group mailing list To post message: TriEmbed@triembed.org <mailto:TriEmbed@triembed.org> List info: http://mail.triembed.org/mailman/listinfo/triembed_triembed.org TriEmbed web site: https://TriEmbed.org To unsubscribe, click link and send a blank message: mailto:unsubscribe-triem...@bitser.net <mailto:unsubscribe-triem...@bitser.net> ?subject=unsubscribe Searchable email archive available at https://www.mail-archive.com/triembed@triembed.org/ -- Best regards, Mike
_______________________________________________ Triangle, NC Embedded Interest Group mailing list To post message: TriEmbed@triembed.org List info: http://mail.triembed.org/mailman/listinfo/triembed_triembed.org TriEmbed web site: https://TriEmbed.org To unsubscribe, click link and send a blank message: mailto:unsubscribe-triem...@bitser.net?subject=unsubscribe Searchable email archive available at https://www.mail-archive.com/triembed@triembed.org/
