摘要
对高通滤波器的典型实现模式而言,增加滤波器的阶数可获得更大的阻带衰减和更小的通带纹波,但其通带的相频特性会因此变差。有文献提出了通过对仪表三运放输出进行积分反馈来实现高通滤波器的方式,但只能实现一阶。对此方式进行了拓展,对仪表运放的输出,先进行若干阶的低通滤波,然后再进行积分反馈。拓展方案面向的是通过积分反馈方式实现更高阶的高通滤波器。计算分析和实验检验显示,按此拓展方案实现高阶高通滤波器是可行的,与不拓展的积分反馈一阶高通滤波器和典型实现的同阶高阶高通滤波器相比,能在通带内获得更好的相频响应。
In typical implementing mode of high-pass filter, increasing the filter order can bring greater attenuation in the stop-band and smaller ripple in the pass-band, hut the phase frequency response will get worse. Some literatures ever proposed an approach to implement high pass filter based on integral feedback of instrument amplifier output, however only one order high pass filter can be implemented. In this paper the approach has been extended. The ex- tending scheme is that the output of the instrument amplifier is filtered first with the low pass filter with some orders and then the integral feedback is performed. The purpose of the scheme essentially is to implement higher order high pass filter. Calculating analysis and experiment test show that the proposed high pass filter implementing scheme is feasible;and compared with un-extended integral feedback one order high pass filter and typical implemented same order high-pass filter, the proposed approach can obtain better phase frequency characteristics in the pass-band.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2013年第7期1634-1639,共6页
Chinese Journal of Scientific Instrument
基金
国家自然基金面上项目(61271079)
江苏省科技支撑计划社会发展项目(BE2010720)资助
关键词
幅频响应
相频响应
积分反馈
高通滤波器
amplitude frequency response
phase frequency response
integral feedback
high pass filter
