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Circuit Studies of improving Narrow-band Tracking Properties in the PLL

GONG Shen-xun (Department of Electronic Engineeing,Shangdong University,Jian 250100,China)  
Phase-locked loop (PLL) can receive and demodulate very weak signal with low signal-noise ratio. It is necessary to coherent communication system.There is a conflict of a narrow-band for filtering input adding-noise with a wideband for repressing modulating-noise. So far, the problem is managed by W. N. optimun filter theory using eclectic method. Therefore, a frequency-phase conversion circuit Which is added to the PLL is given, and the number of Other of the loop can not change. But it can repress both additive-noise and modulating-noise at the same time. This is also verified by first step experimental results. While it is applided to phase- locked receiver, it is anticipative to obtain much better narrow-band tracking properties
【Fund】: 国家自然科学基金
【CateGory Index】: TN761
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