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Carbon RF to Extend Battery Life

Smartphones charge for week instead of day
11/19/2014 07:30 PM EST
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R_Colin_Johnson
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Re: Tall claim
R_Colin_Johnson   11/23/2014 10:38:27 PM
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Thanks for the reminder about Sharp's transflective display and the LCD+E-Ink prototype. I also just remembered a couple with Qualcomm's backing--its always on Mirasol and micro-shutter Pixtronics, both based on low-power MEMS.

alex_m1
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Re: Tall claim
alex_m1   11/23/2014 5:14:43 PM
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Colin, Sharp has recently talked about a very low power transflective display for smartwatches, aim to be in products in the spring.They claim it's can do video. And a chinese company built a watch with a display that combines lcd+eink.

 

Les_Slater
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Re: Tall claim
Les_Slater   11/23/2014 5:14:18 PM
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As far as the display technology is concerned... I'm just speculating.

As far as gate length goes, 100 nm will never be able to compete directly with silicon using present architectures to meet the functional density requirements. Carbon may be able to replace all of radio, including A/D, D/A and maybe DSP. In general logic, including CPU, GPU and memory things get a little tougher. If energy per logic function is sufficiently low and speed sufficiently high then a speed/area tradeoff might get functionality on par with silicon with similar die area... at significantly lower energy consumption.

alex_m1
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Re: Tall claim
alex_m1   11/23/2014 5:13:09 PM
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Colin, Sharp has recently talked about a very low power transflective display for smartwatches, aim to be in products in the spring.They claim it's can do video. And a chinese company built a watch with a display that combines lcd+eink.

 

R_Colin_Johnson
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Re: Tall claim
R_Colin_Johnson   11/23/2014 3:23:42 PM
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Thank you for your astute observations. Regarding size, they what to reduce it from current gate length of 250 nanometers to 100 nm like GaAs, but with mudch less power. - Regardind displays E-Ink's dispays draw no power until their content is changed, but people don't want ambient light displays. I like your dual LCD/OLED idea, but even though I a an engineer I can't really evaluate its feasibiity. Are you working on one, or know some engineers who are? So far the closest to zero power display I know is E-Ink's.

Les_Slater
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Re: Tall claim
Les_Slater   11/23/2014 10:44:12 AM
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Looks interesting from both RF and logic perspective but don't see any forecast for feature size scaling in logic, will need to get pretty small to support complexity demands going forward.

Working towards zero spatial volume for circuitry and display has it's limits... even with 100% volume for battery, still have to support the power of circuitry and display.

Theoretically, it would seem that a zero power display is possible. Are there any reflective color display technologies available, or on the horizon? Such might work for high ambient light situations. A thin panel of reflective LCD with OLED integrated into the matrix would work for both low and high ambient light scenarios.

R_Colin_Johnson
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Re: Tall claim
R_Colin_Johnson   11/21/2014 4:25:40 PM
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Thank you very much for your comment. I queried the company again about their bold claim, and they stood by it--not claiming that their carbon-based RF transistors alone will give a week of battery time for a smartphone, but that when all the advantages of carbon are put in place over the next few years (their next development project is logic transistors based on carbon). If you want all the nitty gritty of how this could be possible, here's the complete explanation, probably with more detail than you want, but very believable to me: Carbon FET-based digital systems are predicted to be able to outperform silicon-based (CMOS) technologies by more than an order of magnitude in terms of energy–delay product. Large power consumption benefits for all smartphone logic and display components. § Quasi-ballistic transport & high saturation-velocity · Due to 1D nature of CNTs · vsat ~ 7x that of GaAs § Low intrinsic capacitance - Carbon electronics allows systems to operate down to 1v, existing smartphones operate at about 3.7v. Large power consumptions benefits for all smartphone components. - Carbon nanotubes exhibit the highest mobility at room temperature (>50000 cm^2/(Vs)) among any other semiconductor materials. Increased mobility in nanowires results in smaller saturation electric fields at which the electron velocity saturates and, thus, smaller operational drain-source voltages. Combined with high current densities in carbon electronics this would result in significantly higher ratio of IP3 levels to power consumption. Further power consumption improvements on RF components of smartphone. - Large power consumptions benefits and the opportunity to consolidate RF transceivers / FEMs, due to the super linear nature and wide bandwidth of carbon electronics. Consolidation of components, allows for more weight and space for OEMs to enlarge battery, further adding to the power budget. As well as improve bit rate transfer per energy consumption unit due to linearity improvements of carbon electronics. - Losses from the OFF state transistor components, can be nearly eliminated. Existing scaled Si transistors loose up to 50% power when transistor is OFF. Better immunity to short-channel-effects compared to Si MOSFETs (i.e. Scalable to shorter Lg without fT roll-off ) - Carbon electronic more favorable to next generation high bit rate protocols such as WiGig, 60GHz, further energy improvement capacity beyond incumbent technologies. - Carbon has the world’s highest thermal conductivity values, allowing for operating electronics much “cooler”, and not to mention multitude of energy harvesting opportunities. Further increasing power budget.

R_Colin_Johnson
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Re: Tall claim
R_Colin_Johnson   11/21/2014 12:27:19 PM
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I don't believe it either, but I repeatedly grilled CEO Kos Galatsis about this claim which he stood by steadfastly. By the way his claim was not weeks but one week. He admits that the display consmes most of the power today, but that RF is second and that soon most of the parts inside a cell phone will be replaced by carbon-based componenets that use much less power--that's when the once-a-week charge will be possible. I will query him again, with your objection, and ask him to defend his claim directly to your question. I want to get to the bottom of this as well.

dromdrom
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Tall claim
dromdrom   11/21/2014 9:35:05 AM
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Smartphone power is not being consumed by RF features but by people playing games (CPU+GPU active, not RF) on their hi-res screens. I fail to see how carbon RF will help for such use cases.

EE-times should not post these ads with falseo claims; weeks instead days until batteries drain.

krisi
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Re: New Details
krisi   11/20/2014 3:30:30 PM
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Good points Colin...but you are putting a new material (carbon) inside CMOS...that usually takes several years from concept to volume production...I wish these guys all the best, it would be so cool have this RF technology around

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