Mitsubishi Denki Kabushiki Kaisha

Kazuhito Okishio

Kazuhiro Watanabe

Yasuhiro Shiraki

Hisato Umemaru

Yoshimitsu Takahata

Masaharu Yuhara

Yasuaki Gotoh

This invention provides an electronic control unit is capable of suppressing electromagnetic noise having a frequency band used in a portable wireless apparatus, and capable of exhibiting a noise resistance property against electromagnetic noise. The electronic control unit including a constant voltage power supply circuit portion, an analog signal inputting circuit portion, and a conversion processing circuit portion, an analog sensor and a driving power supply being connected to the outside, and the unit being connected to the analog sensor through a power supply line and a signal line, in which the analog signal inputting circuit portion includes a current limiting circuit portion, an integrating circuit portion, a current limiting resistor, a signal noise absorbing circuit, and a first bypass capacitor, and capacitance (C) and parasitic inductance (L) of the first bypass capacitor are set in a range of 7&#xd7;10&#x3c;1/[2&#x3c0;&#x221a;(LC)]&#x3c;35&#xd7;10.

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Hyogo, Japan

Kazuhito Okishio