从频率的角度设计滤波器电路，必须考虑诸如滤波器带宽设计和阶数(极点的数量)之类的问题。

Approaching the filter circuit from the frequency perspective will force you to consider issues such as the filter bandwidth design and order (number of poles).

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本文介绍一种利用示波器，对由双运放组成的有源滤波器的二阶节电路的零、极点进行准确调整的相位调试法。

In this paper the phase tuning methods by using oscilloscope for the tuning of the pole and zero of the two—amplifier biquads are given.

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用此法设计的观测器具有最低动态阶数，且极点可以任意配置。

The observers thus designed have minimal order and their poles may be assigned arbitrarily.

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