带 【中文名称】：快捕带 【英文名称】：fast pull-in range 【定义1】： 能在一个范围内使环路快速锁定的固有频差。即在快捕带内，VCO的频率变化一次达到输入信号时，即锁定，不会来回摆动寻找而停不下来，便不会离越来越远。
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实践表明：利用一种改进的FFT校频技术对载波频偏进行一次校频，能使载波频偏快速落入锁相环快捕带内。
It has been proved that an improved FFT frequency correction technology, which makes carrier frequency deviation come into fast capture bandwidth quickly, is presented to correct frequency.
本文介绍一种加快频率合成器跳频速度的新方法，该方法能确保环路的初始频差在快捕带以内，使环路迅速捕获锁定。
This paper will discuss a new way to speed frequency hopping of frequency synthesizer. This way will assure that loop circult is locked in a very short time.
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