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中等带宽晶体滤波器平滑群时延设计
江山,罗南英
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(成都天奥电子有限公司,成都 611731)

摘要:

对比分析窄带电路和中等带宽电路的贝塞尔滤波函数特性表明，中等带宽电路的贝塞尔滤波器应用在低频窄带晶体滤波器设计中具有优势。采用计算机仿真手段，修正时域函数的不足之处，平衡窄带晶体滤波器中频域和时域这一对矛盾，使得滤波器的中心频率附近具有0.1 μs波动的平滑群时延特性，同时保证阻带矩形系数小于3，实现低频窄带晶体滤波器恒定群时延和小矩形系数的对立统一性，降低整机和系统出现误码、乱码的几率，同时又确保整机具有较高的杂波抑制度。

关键词: 晶体滤波器中等带宽平滑群时延矩形系数电路设计

DOI：

基金项目:

Smooth Group Delay Design of Medium Bandwidth Crystal Filter

JIANG Shan,LUO Nan-ying

(Chengdu Spaceon Electronics Co.，Ltd.，Chengdu 611731，China)

Abstract:

Comparison of the function characteristics of Besse l filter of narrowband circuit and midband circuit demonstrate s the advantages of application of midband circuit Bessel filter in the desi gn of lowfrequency narrowband crystal filter. The filters have smoothe d group delay characteristics of 0.1μs fluctuation around the center frequency an d the stopband rectangular coefficient is ensure to be less than 3 after modif i ng the shortcomings of timedomain function and balancing the inconsistency of f requency and time domains in narrowband crystal filters through computer simu l ation. The unity of opposites of constant group delay and small rectangu lar coefficient is realized in the lowfrequency narrowband crystal filter. T he probability of error or messy code in the overall unit and system is reduced an d the complete equipment has a high degree of clutter suppression.

Key words: medium bandwidth smooth group delay rectangular coefficient circuit design