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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In the last section, as the design methods of high-order current-mode integrated filters, the equivalent circuits and the multi-loop feedbacks are systematically expounded.

最后本文详细介绍了高阶电流模式滤波器的系统方法，阐述了等效电路替代法和多环反馈法，给出了设计的具体步骤。

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