摘要
在蓄电池性能监测过程中,接收的信号都是比较微弱的低频信号,而且为了得到更多的信息,往往向蓄电池施加多个频率的激励。因此,设计带通滤波器以提高抗干扰能力,而且中心频率要可调。开关电容滤波器可实现低通、高通、带通和带阻滤波功能,而且中心频率可调节,文中采用了LTC1068-200开关电容滤波器集成模块进行电路设计,时钟频率由CD4046锁相环控制。仿真结果表明本文设计的滤波器通带宽度可以达到5 Hz,中心频率从10 Hz到1 kHz可调节,满足实际需要。
In the measuring process of storage battery performance, the received signals are weak ones in low frequency. Moreover, to get more message , usually put power of different frequencies on battery. So design band pass filter to improve the ability of anti-jamming, and the center frequency should be changed. The function of either low pass, high pass, band pass or a notch can be achieved by the Switched Capacitor Filter. The LTC1068-200 Switched Capacitor Filter can be adopted and the clock frequency can also be adopted by CD4046 phase-lock loop in this design. The results of the emluator showed that the bandwidth of filter could be 5 Hz and the center frequency of the filter can be changed from 10 Hz to 1 kHz, the demand of practice is satisfied.
出处
《电子设计工程》
2011年第21期122-124,128,共4页
Electronic Design Engineering
