Renesas Electronics Corporation

Kazuaki Deguchi

Masao Ito

Yasuo Morimoto

In a semiconductor device, an active region includes: a first impurity region to which a predetermined voltage is applied; second and third impurity regions forming a pair of conductive electrodes of an insulated gate field effect transistor; and at least one impurity region disposed between the first and second impurity regions. A voltage that causes electrical conduction between the second and third impurity regions is applied to a gate electrode disposed between the second and third impurity regions. All gate electrodes disposed between the first and second impurity regions are configured to be electrically connected to the first impurity region constantly. All impurity regions disposed between the first and second impurity regions are electrically isolated from the first and second impurity regions and maintained in a floating state.

Semiconductor device

A successive approximation type AD converter includes: a comparator comparing an analog input signal and a DA-converted comparison code; and a control circuit. When an output of the comparator settles before a limit time period has passed since the comparator started a comparison operation, the control circuit updates the comparison code on the basis of the settled output of the comparator. When the limit time period has passed before the output of the comparator settles, the control circuit updates the comparison code not on the basis of the present output of the comparator.

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Kawasaki, Japan

Kazuaki Deguchi