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介绍用数模结合的方法产生正弦脉宽调制（ＳＰＷＭ ）信号的电路组成及其工作过程。用此方法获得的 ＳＰＷＭ信号的稳定性和精确性都优于用模拟方法形成的 ＳＰＷＭ信号，而且还比用单片机编程的数字方法所形成的ＳＰＷＭ信号的实现过程要简单容易得多，也便于调节。
Introduce the method of digital-analog combined to generate the sinusoidal pulse width modulation (SPWM) signal circuit and its working process. The SPWM signal obtained by this method is more stable and accurate than the SPWM signal generated by the analog method and is much simpler and easier to implement than the SPWM signal formed by the digital method programmed by the single chip microcomputer .