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有源滤波器“通用性”问题的研讨,对简化有源网络的设计,实现大规模集成,降低成本至关重要,但至今尚未引起足够重视。本文主要通过分析自动跟踪式有源带通滤波器的性能及其实现,着重指出解决“通用性”问题的途径之一是采用自适应网络。与一般的自适应系统比较,文中讨论的自动跟踪系统不需另加参考频率或设置内部振荡器及同步电路,因而电路简单、稳定性好。此外,本系统除用于跟踪滤波外,还具有波形变换及从非正弦周期信号中提取基波成分等多用途的优点。
The discussion of the “commonality” of active filters is of crucial importance for simplifying the design of active networks, realizing large-scale integration and reducing costs, but so far not enough attention has been paid to them. This paper mainly analyzes the performance of automatic tracking active band-pass filter and its implementation, emphasizing that one of the ways to solve the “universal” problem is to use adaptive network. Compared with the general adaptive system, the automatic tracking system discussed in this paper does not need additional reference frequency or set the internal oscillator and synchronization circuit, so the circuit is simple and stable. In addition, the system is used for tracking filtering, but also has the advantages of multipurpose waveform transformation and extraction of fundamental components from non-sinusoidal periodic signals.