高品质抗混叠滤波器设计  

Design of High Quality Anti-aliasing Filter

作　　者：彭永胜[1] 王太勇[1] 范胜波[1] 吴振勇[1] 王双利[1] 

机构地区：[1]天津大学机械工程学院,天津300072

出　　处：《西南交通大学学报》2003年第5期596-601,共6页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金(50175081)

摘　　要：经过分析和计算,巴特沃斯滤波器、贝赛尔滤波器和3 dB切比雪夫滤波器在截止频率处分别有-90°,-74.2°和-114.4°相移,而阻带在10倍截止频率处的衰减度分别为-40,-35.9和-43dB/oct.40kHz以上频率段MFB结构的低通滤波器较S K结构有更好的性能.由此,抗混叠滤波器的设计能得到优化.The analysis and calculation show that low-pass Butterworth filters, Bessel filters and 3-dB Chebyshev filters have respectively a phase delay of -90°, -74.2° and -114.4° at the cutoff frequency, while their stopband attenuation is respectively -40, -35.9 and -43 dB/oct, where the input frequency is ten times the cutoff frequency. For frequency above 40 kHz, low-pass filters with an MFB(multiple-feedback) structure has better performance than those with an S-K(Sallen-Key) structure. As a result, the design of anti-aliasing filters can be optimized.

关 键 词：优化设计 测控系统 抗混叠滤波 

分 类 号：TM93[电气工程—电力电子与电力传动]