30 Jun '15, 6pm

Gates to FPGAs: TTL Electrical Properties

Gates to FPGAs: TTL Electrical Properties

A transistor when used as a switch can go into a state known as saturation. Part of the definition of “transistor saturation” includes the state when both Base-Emitter and Base-Collector junctions are forward biased, however the property of interest here is that it is also slow to turn off as there is an excess of charge built up that has to be drained off first before the device starts to respond. A Schottky diode across the base-collector junction effectively holds the transistor right on the edge of being turned “on” and keeps excessive charge from building up. A transistor paired with a Schottky diode in a gate is often redrawn as shown above on the right.

Full article: http://hackaday.com/2015/06/30/gates-to-fpgas-ttl-electri...

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Twisting Graphene Alters Its Electrical Properties

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spectrum.ieee.org 02 Jul '15, 7pm

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