| 摘要 |
PROBLEM TO BE SOLVED: To set threshold voltage with ease and precision. SOLUTION: In pMOSs 18 and 20, a source region 30 consists of a p+ source region 34 and an LDD region 36 consisting of p-, and a drain region 32 comprises a p+ drain region and an LDD region 40 consisting of p-. The pMOSs 18 and 20 contain hallow layers 42 and 44 consisting of an n-type conductive layer at facing parts of the LDD regions 36 and 40. The pMOSs 18 and 20 are different from each other in the quantity of impurity implantation into the hallow layers 42 and 44, and in the set value of threshold voltage.
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