Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Prasad Chaparala0
Chin-Miin Shyu0
Constantin Bulucea0
Fu-Cheng Wang0
Chih Sieh Teng0
Date of Patent
December 5, 2006
0Patent Application Number
109220350
Date Filed
August 18, 2004
0Patent Primary Examiner
Patent abstract
The source/drain zones (140 and 142 or 160 and 162) of a p-channel IGFET (120 or 122) are provided with graded-junction characteristics to reduce junction capacitance, thereby increasing switching speed. Each source/drain zone contains a main portion (140M, 142M, 160M, or 162M) and a more lightly doped lower portion (140L, 142L, 160L, or 162L) underlying, and vertically continuous with, the main portion.
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