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rick merritt
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Hot topics
rick merritt   10/2/2013 10:20:37 AM
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I'm hoping to hear about

--a shipping 64-bit ARM server SoC

--any shipping 64-bit ARM cores

--next steps and proof points for big.little

--sub-threshold work for IoT

It will also mark the first time I've heard from Bill Veghte since he was the up-and-coming, hard-charging head of M'soft's embedded group years ago.

krisi
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sub-threshold
krisi   10/2/2013 4:27:47 PM
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Agree Rick...sub-threshold work for IoT is the most interesting in my view

goafrit
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Re: Hot topics
goafrit   10/2/2013 8:35:58 PM
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What is the unique thing about sub-thresold work in the IoT? When you work in the weak inversion, you do not get great signals. In the analog domain, there are few opportunities as you can have exponential gain but your signal degrades. What is the magic here at sub-threshold that we need to know for ARM which is a digital/uP company?

krisi
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Re: Hot topics
krisi   10/3/2013 12:08:44 PM
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It is well proven in the literature that operating in sub-threshold minmizes power dissipation in digitla VLSI ckts...the optimum VDD is about 0.3V-0.6V...it is very interesting to see whether these academic studies extent to a real world of high complexity processor...hence my interests...Kris

goafrit
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Re: Hot topics
goafrit   11/1/2013 8:10:20 PM
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>> It is well proven in the literature that operating in sub-threshold minmizes power dissipation in digitla VLSI ckts

I am not aware you can bias digital circuits in sub-threhold. I know when they do sub-t, it is always in analog portion of circuits. Digital always needs to exceed Vmid and that is way ahead of the Vt (threshold voltage) which you must stay below in sub-threshold design

krisi
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Re: Hot topics
krisi   11/2/2013 10:39:40 AM
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There is a large number of papers published at ISSCC and IEEE Journal of Solid St Ckts that explain why the energy is minimized in sub-threshold

goafrit
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Re: Hot topics
goafrit   11/9/2013 3:19:56 PM
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>> There is a large number of papers published at ISSCC and IEEE Journal of Solid St Ckts that explain why the energy is minimized in sub-threshold

Simply reason - you operate with the least amount of current, range of picoAmp

krisi
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Re: Hot topics
krisi   11/11/2013 11:19:27 AM
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It is not as simple @goafrit...smaller Vgs produces smaller Id current and the power goes down...but the device speed goes down too so now you need more time to complete the same task...it is not obvious at what Vgs or Vdd the energy will be minimized...fairly complex analysis is required...Kris

goafrit
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Re: Hot topics
goafrit   12/3/2013 10:17:15 AM
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We are saying the same thing. Analysis of weak inversion operation of MOSFET is largely established. You do not expect to make high speed systems with that. 



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