| 摘要 |
PURPOSE:To reduce the generation of distortion in a demodulation signal, by connecting a resistor between an input terminal and an output terminal, connecting one end of a capacitor to the output terminal, and connecting a constant current source to the other end of the capacitor. CONSTITUTION:The resistor 2 is connected between a pulse width modulation (PWM) signal input terminal 1 and a PWM demodulation signal output terminal 3, and the one end of the capacitor is connected to the PWM demodulation signal output terminal, and the constant current source 9 is connected to the other end of the capacitor 4. In such a way, it is possible to increase/decrease linearly the output potential of a PWM demodulation signal in proportion to a time, and to reduce a conventional error due to the exponential increase/ decrease of the output voltage of the PWM demodulation signal.
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