Abstract: A method and circuit for preventing an output signal, which has been corrected through digital correction or analog correction, from deviating from a target value and for preventing power supply noise and power consumption from increasing. A sensor amplification circuit receives output of a sensor as an input signal. Correction points are set at predetermined temperature intervals. The sensor amplification circuit performs digital correction for correcting the input signal with correction data set for each correction point. Further, the sensor amplification circuit performs a second correction for correcting the input signal between the correction points with gradient data calculated from the correction data for two of the correction points that are adjacent to each other.

Abstract: This invention provides a comparator circuit which outputs a stable waveform without oscillation even if a gradient of a change of a comparison input signal is small and determines a magnitude of the comparison input signal within a predetermined threshold value regardless of the increase/decrease direction of the comparison input signal.

Abstract: An amplifier 1 is arranged to amplify a sense signal from a sensor with low current consumption while maintaining sufficient sensitivity. The amplifier 1 comprises a detection circuit 2 which detects a signal level of the sense signal and outputs an alarm signal when the sense signal is in a first signal level range R1, and a variable gain amplifier 3 which, based on a detection result of the detection circuit 2, stops an amplifying operation when the sense signal is in the first signal level range R1, performs the amplifying operation at a first gain G1 when the sense signal is in a second signal level range R2, or performs the amplifying operation at a second gain G2 larger than the first gain G1 when the sense signal is in a third signal level range R3 defined between the first and second signal level ranges.

Abstract: A temperature characteristic correction method enabling easy setting of correction points, while reducing deviations of an output signal from a target value and preventing power supply noise and power consumption from increasing. The method includes storing correction patterns, each of which includes correction points set at a temperature interval that differs between the correction patterns. The method further includes storing correction data for each correction point in each correction pattern, selecting a correction pattern corresponding to the temperature dependent characteristic of the input signal from the correction patterns, and correcting the temperature dependent characteristic of the input signal with the selected correction pattern and the correction data corresponding to the selected correction pattern.

Abstract: A method and circuit for preventing an output signal, which has been corrected through digital correction or analog correction, from deviating from a target value and for preventing power supply noise and power consumption from increasing. A sensor amplification circuit receives output of a sensor as an input signal. Correction points are set at predetermined temperature intervals. The sensor amplification circuit performs digital correction for correcting the input signal with correction data set for each correction point. Further, the sensor amplification circuit performs a second correction for correcting the input signal between the correction points with gradient data calculated from the correction data for two of the correction points that are adjacent to each other.

Abstract: This invention provides a comparator circuit which outputs a stable waveform without oscillation even if a gradient of a change of a comparison input signal is small and determines a magnitude of the comparison input signal within a predetermined threshold value regardless of the increase/decrease direction of the comparison input signal.