图1电路的生产使用精确的可变频率正弦波波作为一个通用的参考信号。它包括一个8阶椭圆形，开关电容低通滤波器器（IC3 ）微处理器IC2产生的100kHz方波时钟。 （任何其他方便的方波源也是可以接受的。 ）微控制器的时钟由10MHz的振荡器模块。一个电压监控器（ IC1 ） ，确保在电源故障时的正确操作。 IC3的设置在1/100的时钟频率，滤波器的截止频率。 Maxim > App Notes > Automotive Filter Circuits (Analog) Signal Generation Circuits Keywords: digitally controlled sine-wave generator, sine wave, circuits, IC3 Jun 27, 2003 APPLICATION NOTE 2081 Digitally Controlled Sine-Wave Generator A similar version of this article appeared in the May 15, 2003 issue of EDN magazine. The circuit of Figure 1 produces an accurate variable-frequency sine wave for use as a general-purpose reference signal. It includes an 8th-order elliptic, switched-capacitor lowpass filter (IC3) that is clocked with a 100kHz square wave generated by microcontroller IC2. (Any other convenient squarewave source is also acceptable.) The microcontroller is clocked by a 10MHz oscillator module. A vo……