According to transfer functions of the loop filter and the single phase locked loop system, it figures out the loop filters parameters, and introduces the selection of loop bandwidth.

根据环路滤波器传递函数以及单环锁相系统的传递函数，计算出环路滤波器的各个参数，并介绍了环路带宽的选择。

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The possibility of using this kind of phase-locked loop under noise interference and the problems of filter design are discussed.

文中还讨论了在噪声作用下采用这种环路的可能性和滤波器的设计问题。

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The design and implementation of quadrature waveform generator are described based on the AT89C52, phase-locked loop(PLL) and switched-capacitor filter(SCF).

描述了基于AT89C52单片机、锁相环和开关电容滤波器的正交信号发生器的设计和实现方法。

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When the doors of his buildings aren't locked, his neighbors filter through to borrow books and records or eat occasional communal meals.

WSJ: The Artist Next Door | Innovator of the Year 2012 Art