| 摘要 |
The present invention aims to provide a differential voltage amplifier circuit capable of preventing narrowing of an input voltage allowable range, making unnecessary the calculation of correction by an MPU or the like, reducing an influence due to a change in temperature and detecting a high-accuracy differential voltage. Upon a short circuit between input paths, an output voltage of a differential amplifier at the short circuit therebetween is held in a capacitor. Upon differential voltage amplification, a subtraction circuit section performs a process for subtraction between the output voltage held in the capacitor and a bias voltage. An output voltage is applied to a bias voltage terminal, and an output voltage obtained by multiplying the difference between input voltages by an amplification factor AV with the applied output voltage as the reference is outputted via an output terminal for a differential voltage amplifier circuit section.
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