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Politics : Formerly About Advanced Micro Devices
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To: Greater Fool who wrote (85938)1/7/2000 8:35:00 PM
From: Elmer  Read Replies (1) of 1572195
 
Re: "Displaying my ignorance: what is IDDQ testing, and what are subthreshold leakage currents?"

IDDQ testing was an idea in vogue a few years ago. The notion was that defects manifest themselves as leakage paths. If you simply hold a perfect part in a static state, there should be no current draw, however a defective part will have current draw even when unclocked. Sounds great on paper but modern processes screw down the channel lengths so tight that they don't completely turn off and that results in "sub-threshold leakage". Even a perfect part will have measureable leakage current draw in a static state. The magnitude of the leakage current increases with temperature and will swamp any defect leakage path you are trying to screen. So IDDQ testing has lost it's luster and joins so many other solutions that sounded great on paper but never lived up to their potential.

EP
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