中、低频超宽捕捉带跟踪滤波PLL环路的设计与实现

Design of Ultra-wide Pull -in Range PLL for Tracking -Filtering in IF-LF Domain

介绍由新型复合集成PLL组成的超宽捕捉带跟踪滤波环路。当输入信号电平≥50mV;S/N≥1时,捕捉及跟踪带均达90％f_0以上。

In this paper,an ultra-wide pull-in range PLL used as a narrow-band tracking filter in medium-low frequency domain is presented. The loop with two chips of complex function integrated PLL is a compound -loop. The pull-in and hold-in range is up to or even over 90% of the loop center frequency when the input signal level is more than 50mV and S/N≥1.