Mitsubishi Electric Corporation

Takeharu Umegami

Yoshinori Tatenuma

Hideki Shimauchi

Akio Kamimurai

Provided is an AD converter having a rail-to-rail input voltage range and being free of a missing code and monotonicity loss. A comparator includes a first comparator having an NMOS differential input stage, a second comparator having a PMOS differential input stage, and an output selection circuit configured to select any one of outputs of the two comparators. A correction circuit acquires in advance a first AD converted value in the case of using the first comparator and a second AD converted value in the case of using the second comparator with respect to the same input voltage to calculate a correction value, and performs correction processing based on the correction value to suppress an offset error between the first AD converted value and the second AD converted value.

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Tokyo, Japan

Takeharu Umegami