基于PSCF实现自适应滤波器的设计方法

Design Technigue of Adaptive Filter Based on PSCF

本文针对在信号处理和测量中,信号为缓慢时变且同时受到谐波和噪声干扰的情况,提出了一种"基于PSCF(可编程开关电容滤波器)实现自适应滤波器(ADF)的设计方法"。该自适应滤波器的显著特点是滤波频率可以自适应地跟踪输入信号的频率变化,而且它的品质因数Q和滤波频率可以独立编程。实验证明,该自适应滤波器具有良好的信号处理性能和实用性。

In order to solve the problem that the period of a signal is slowly-varying and that the signal is affected seriously by harmonics and noise in the signal processing and measurement, an adaptive filter （ADF） is designed by using the programmable switched capacitor filter （PSCF）. A distinguished advantage of the ADF is that its filtering frequency can adaptively track the input signal frequency in a wide frequency range of more than five decades. Its quality factor （Q） and filtering-frequency of the filter may be programmed independently. The paper discussed the principle and design method of the ADF in detail. In addition, the characteristic and the programming method of MAX261 is discussed. At last, the paper gave the design example of Chebyshev ADLF. And the design techniques and problems need to be noticed have been described through the example.