摘要
对实际应用中的脉宽调制 ( PWM)波形的频谱进行了理论分析 ,指出通过一个低通滤波器可以把 PWM调制的数模转换信号解调出来 ,实现从 PWM到 DAC的转换。论文还对转换误差产生的因素进行了分析 ,指出了减少误差的方法 ,论文给出了两种从 PWM到 0～ 5 V电压输出的电路实现方法 ,第 2种电路具有很高的转换精度。
This paper analyzes the frequency spectrum of a practical PWM wave and points out that it is possible to demodulate the digital to analog signal from PWM with a lowpass filter and to realize a DAC. This paper also analyzes the error due to transform and gives some methods to reduce errors. This paper designs two DAC electronic circuits from PWM to voltage 0~5 V output. The second circuit is a DAC with high precision.
出处
《现代电子技术》
2004年第14期81-83,共3页
Modern Electronics Technique
关键词
脉宽调制
电路设计
数模转换器
单片机
PWM
electronic circuit design
DAC
singlechip microcomputer
