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.
出处
《西南交通大学学报》
EI
CSCD
北大核心
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)
关键词
优化设计
测控系统
抗混叠滤波
optimum design
measurement and control system
anti-aliasing filter
