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用频率反馈环帮助锁相环进行频率捕捉,可以使窄带锁相环在宽频带内实现快速捕捉。本文分析了频率反馈环的传递函数,暂态响应以及频率引导时间和引导精度。还分析了几种形式的频差检波器的性能。介绍了一种阶梯扫描和频率反馈环结合的频率引导装置及其设计和实验参数。结果表明这种引导设备可帮助窄带锁相环在较短时间内在宽频带实现频率捕捉。
Frequency feedback loop to help PLL frequency capture, narrowband PLL can be achieved in a fast broadband capture. This paper analyzes the frequency feedback loop transfer function, transient response and frequency of the boot time and guidance accuracy. Also analyzed several forms of frequency difference detector performance. A frequency guidance device combined with step scanning and frequency feedback loop is introduced and its design and experimental parameters are introduced. The results show that this guidance device can help narrow-band PLL in a short period of time to achieve frequency capture in a wide frequency band.