| 摘要 |
PURPOSE:To simplify the constitution, by switching and demodulating an input amplitude modulation signal in a prescribed timing with a rectangular wave component forming a step waveform where the high-order higher harmonics are zero substantially and which is regarded as a sinusoidal wave. CONSTITUTION:Two switch circuits 2, 3 switching a composite signal 1 are provided in parallel mutually. Further, the switch circuits 2, 3 are operated with different and scheduled switching signals W7', W1. Then, an output level of a differential amplifier 4 is adjusted at an attenuator 6, and summed and synthesized at an adder 7 together with an output of a differential amplifier 5. A synthesized output the same as the multiplication of an approximated sinusoidal wave formed with the step waveform with the composite signal is obtained at an output terminal 8. |
