| 摘要 |
PROBLEM TO BE SOLVED: To provide an input buffer circuit wherein even when variations of a process are increased, variations of threshold voltages determining a high level and a low level are prevented from being increased following the foregoing variations of the process. SOLUTION: In an input buffer circuit, previous stage circuits are adapted to be those having different logical threshold voltages, respectively, and outputs of the foregoing circuits are connected to gates of a P type MOS transistor and an N type MOS transistor connected in series both in later stages. Logical threshold voltage in the later stage lies between the different threshold voltages of both circuits in the previous stage. COPYRIGHT: (C)2003,JPO
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