Introduces the basic principle of phase-locked loop and NE564 PLL circuit structure and properties, and the use of phase-locked NE564 demodulating circuit and phase-locked frequency circuit.

介绍了锁相环的基本原理和锁相环ne564的电路结构和性能，及其用ne564构成的锁相解调电路和锁相倍频电路。

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This technique is accomplished by word-phrase conversion, making use of the principle of appearance frequency and the ability of word-generation.

本技术是利用语言文字使用的频度规律和单字组词能力，通过字词变换来实现的。

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This design is the use of leading correction principle, finally meet the performance index of a control system open loop gain, phase margin, angular frequency requirements.

本设计利用超前校正原理，最终满足对控制系统性能指标开环放大系数、相角裕量、截止角频率的要求。

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