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本文从理论上分析了滤波参数与幅频特性和相移特性的定量关系。在通频带内,幅频特性曲线的幅值的大小与阻尼系数有关。在阻带区,幅频特性曲线陡度的大小取决于滤波器的级数。滤波器的相移特性曲线均在0°—180°范围内变化,随着阻尼系数的增大,相移值反而减小。实验表明,阻尼系数和正反馈电容选择合适,理论计算的幅频特性曲线和实测的幅频特性曲线基本一致,可以实现去假频滤波器对传输地震信号的高保真。
This paper theoretically analyzes the quantitative relationship between the filtering parameters and amplitude-frequency characteristics and phase-shift characteristics. In the pass band, the magnitude of the amplitude-frequency characteristic curve is related to the damping coefficient. In the stopband, the magnitude of the steepness of the amplitude-frequency characteristic depends on the number of stages of the filter. The phase shift characteristics of the filter all change within the range of 0 ° -180 °. With the increase of the damping coefficient, the phase shift decreases. Experiments show that the damping coefficient and the positive feedback capacitor are chosen properly. The theoretically calculated amplitude-frequency characteristic curve and the measured amplitude-frequency characteristic curve are basically the same, which can realize the high fidelity of the anti-aliasing filter to transmit the seismic signal.