| 摘要 |
PROBLEM TO BE SOLVED: To provide reference voltage having high immunity for a noise by providing a voltage divider which is connected to a voltage supply source, decides reference voltage, and supplies a voltage output signal under control of a feedback control signal, and a feedback buffer amplifier for supplying a feedback control signal to a voltage divider. SOLUTION: A feedback buffer amplifier is provided in a reference voltage generator, and a N-type transistor M0 and a P-type transistor M1 which are connected in series between VDD and ground are provided. Gates of the transistors M0. M1 are connected respectively to a N-drive output signal 36 and a P-drive output signal 38, also, the transistors M0 and M1 are connected by a node D, the node D is connected to a substrate of the transistor M1, and supplies a feedback control signal 34 to a delay element. In order to secure quick response, the transistors M0, M1 has small size, and the node D is subjected to light load.
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