Can Transistors Be Made To Work When They're Off? 89
An anonymous reader writes "Engineers at the Belgian research institute IMEC are looking at the use of silicon transistors in the sub-threshold region of their operation as a way of pursuing ultra-low power goals. A chip the engineers are designing for biomedical applications could have blocks designed to operate at 0.2 or 0.3 volts, researchers said, according to EE Times. The threshold voltage is the point at which the transistor nominally switches off. Operating a transistor when it is 'off' would make use of the leakage conduction that is normally seen as wasted energy, according to the article."
Yes and No (Score:2, Interesting)
"Off and off-er" or "off and almost-as-off"? (Score:5, Interesting)
As we've scaled deep into the submicron region, it's been getting harder and harder to turn the devices really "off". Leakage current has been rising and has been quite noticable for several generations now.
So the idea of doing useful work with subthreshold current sounds neat
(OK, I just went and read TFA.)
Still sounds neat, but...
In deep submicron part of the reason for the subthreshold leakage problems is control of Leff. (The effective channel length of the FETs.) There's a thing called "line length variation" which means that channel lengths in different parts of the chip will be different, sometimes subtly, sometimes not so subtly. Threshold voltage (Vt) is a strong function of channel length, making subthreshold leakage also a strong function of channel length. Performance characteristics will vary widely across the chip, likely much more than conventional transistor operation.
This will make it tough to scale down, (in feature size) scale up, (in chip size) and make manufacturable.
Nothing new (Score:4, Interesting)
I don't know anything about electrical engineering (Score:2, Interesting)
Re:Not news (Score:4, Interesting)
Low power decisions (Score:3, Interesting)
The goal of low power transistors is reasonable, but a new transistor design may be needed. The brain can do a lot of operations with little power but in terms of clock speed, the brain isn't that fast. A similar design may be good for low power electronic decisions - massive number of circuits at low frequency.
Re:Yes and No (Score:1, Interesting)
Snake oil? Only if you think it is about global energy preservation. This could be used for extending battery life in cell phones or laptops. If they end up increasing the battery life with 10% or so it will become the new energy saving technology^tm that everyone will use.
Re:Yes and No (Score:3, Interesting)