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Technology Stocks : LSI Corporation
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To: shane forbes who wrote (12103)5/4/1998 9:41:00 AM
From: Grand Poobah  Read Replies (1) of 25814
 
Shane,

LSI should be OK with masks for a while. Mask makers are concerned with the drawn gate length of a process, not the effective gate length. There didn't used to be much of a difference between the two, but now that we are getting to these smaller transistors, short-channel effects are becoming prominent, one of which is the difference between drawn and effective gate lengths. The drawn gate length is the physical dimension of the polysilicon gate as reproduced from the mask. The effective gate length is the effective electrical length of the channel, which is shortened by the depletion region from the drain p-n junction extending under the gate. The drawn gate length describes the gate as it is physically built (which is of interest to the mask maker), and the effective gate length describes the gate as it operates electrically (which is of interest to the designer and makes for better PR for the company since it is a smaller number).

G.P.
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