A Method to Improve the Phase Noise of Frequency Synthesizer Based on PLL
Naichang Yuan · Modern Radar · 2008
The synthesizer,based on digital phase-locked loop(DPLL),has wide yang application in modern electronic technology,shch as communication,radar etc.To reduce phase noise of microwave-band frequency synthesizer,the paper introduces the method of frequency conversion and phase-lock.Then,the compatible loop filter is designed.Finally,the results of experiments prove the phase noise of frequency conversion and phase-locked synthesizer is greatly lower than that of direct phase-ocked synthesizer.