| 一种巴特沃斯低通滤波器构成的PWM转DAC设计 |
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| 引用本文： | 龙顺宇,何程,杨伟,吴建奇. 一种巴特沃斯低通滤波器构成的PWM转DAC设计[J]. 单片机与嵌入式系统应用, 2021, 21(4): 64-67 |
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| 作者姓名： | 龙顺宇 何程 杨伟 吴建奇 |
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| 作者单位： | 海南热带海洋学院海洋信息工程学院,三亚572022 |
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| 基金项目： | 海南热带海洋学院2020年校级教育教学改革研究项目;海南热带海洋学院2019年校级教改项目;海南省2020年教育发展专项资金项目 |
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| 摘 要： | 本文提出一种巴特沃斯有源低通滤波器构成的PWM转DAC设计,利用STC8单片机片内12位分辨率的PWM发生器产生了频率为10 kHz、占空比可变的PWM信号。将信号送入巴特沃斯低通滤波器后,PWM信号转换为直流电压,电压幅度与PWM信号占空比呈正比变化,转换得到的直流电压纹波小于0.2 mV,转换分辨率可达1/12位。转换电路线性度较高、纹波小、谐波抑制比较高。相比于专用DAC芯片或PAC芯片而,该方案性价比高,可以适配于分辨率要求高、建立时间要求一般的应用场景。
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| 关 键 词： | 脉宽调制 数/模转换器 PAC转换器 巴特沃斯滤波器 |
PWM to DAC Design Composed of Butterworth Low-pass Filter |
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| Long Shunyu,He Cheng,Yang Wei,Wu Jianqi. PWM to DAC Design Composed of Butterworth Low-pass Filter[J]. Microcontrollers & Embedded Systems, 2021, 21(4): 64-67 |
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| Authors: | Long Shunyu He Cheng Yang Wei Wu Jianqi |
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| Affiliation: | (College of Oceanographic Information Engineering,Hainan Tropical Ocean University,Sanya 572022,China) |
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| Abstract: | In the paper,a PWM to DAC design is proposed,which is composed of Butterworth active low-pass filter.It uses the 12 bit resolution PWM generator on the STC8 microcontroller to generate a PWM signal with a frequency of 10 kHz and a variable duty cycle.After sending the signal to the Butterworth low-pass filter,the PWM signal is converted into a DC voltage,and the voltage amplitude changes in proportion to the PWM signal duty cycle.The converted DC voltage ripple is less than 0.2 mV,and the conversion resolution can reach 1/12 bit.The conversion circuit has high linearity,small ripple and high harmonic suppression.Compared with a dedicated DAC chip or a PAC chip,this solution is cost-effective and can be adapted to application scenarios with high resolution requirements and general setup time requirements. |
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| Keywords: | PWM DAC PAC converter Butterworth filter |
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