The toroidal core was excited by sharp pulse current. The sensor circuit is composed of peak value detector, Butterworth low-pass filter and differential amplifier.
磁芯采用高频脉冲电流励磁，信号处理电路由峰值检波、低通滤波及差动电路构成。
This paper introduces the basic methods for designing the low-pass filter, taking Butterworth filter as an example.
文章以巴特沃思滤波器为例介绍低通滤波器的基本设计方法。
Based on the sensitivity analysis to the method of Butterworth active filter design. this paper introduces the advantage and disadvantage of each design project.
本文针对巴特·沃兹有源滤波器设计进行了灵敏度分析，给出了各个设计方案的优缺点。
Butterworth filter has most smooth filter performance, and has most application.
巴特沃兹滤波器具有最平滑的滤波特性，因而使用最多。
Therefore, in actual use, Butterworth filter has already been listed as the first choice, and used very widely.
因此在实际使用中，巴特沃斯滤波器已被列为首选，用途十分广泛。
In this paper, it discuss the hardware design and software design of the system. In hardware design, it mainly includes peripheral memory, low Butterworth filter, isolated serial port.
在论文中讨论了系统的硬件设计和软件设计：硬件设计包括外围存储器的扩展、巴特沃斯虑波器的设计、防干扰的隔离串口的设计等；
In this paper, it discuss the hardware design and software design of the system. In hardware design, it mainly includes peripheral memory, low Butterworth filter, isolated serial port.
在论文中讨论了系统的硬件设计和软件设计：硬件设计包括外围存储器的扩展、巴特沃斯虑波器的设计、防干扰的隔离串口的设计等；
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