| 摘要 |
PURPOSE:To obtain an integrator of small integration output voltage drift against fluctuation of temperature of a circular or fluctuation of power source voltage by leading middle point voltage of an inversion and a non-inversion signal to an input terminal of a differential amplifier circuit as a reference signal. CONSTITUTION:An input pulse signal is waveform shaped by a D type flip-flop 11, and the non-inversion output signal Q is inputted to an integrating circuit 12 to find an integration value. The integration value is further inputted to an inversion input terminal of an operational amplifier 15. Middle point voltage between a non-inversion output signal Q and an inversion output signal Q' is inputted to another non-inversion input terminal of the operational amplifier 15 as a reference signal, and the operational amplifier 15 amplifies and outputs the integration value from the integrating circuit 12 making the middle point voltage a basis. At this time, even if the inputted non-inversion output signal Q causes fluctuation of level, the middle point voltage fluctuates by the same amount, and fluctuation of level is canceled by the operational amplifier 15.
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