The Design of Wide BW frequency synthesizer based on the DDS&PLL hybrid method

摘要：

Frequency synthesizer is an important component in the modem electronic systems. This paper studied a kind of frequency synthesizer in the UAV system and put forward an improvement method for DDS (Direct Digital Synthesis) &PLL (Phase Locked Loop) hybrid frequency synthesizer. Be further to raise PLL performance in fast locking and noise immunity ability in the improvement method,a PLL with Analog Adaptive Bandwidth Control (AABC) has been designed in this paper. The new-type AABC has been presented based on conventional Charge pump PLL circuit. The PLL with AABC block can control the loop bandwidth according to the locking status and the amount of inputs phase error adoptively;and consequently lownoise and fast-lock performance are achieved. End,the designed Frequency synthesizer satisfies an 800MHz to 1.8GHz output range and a 0.4ms maximum conversion time. Working at 900MHz,the phase noises are-93dBc/Hz at 200 kHz offset,and the whole circuit draws 8.7mA current from 3.0V supply.

关键词： Frequency synthesis PLL DDS phase-noise spurious.

作者: Li YongKe

作者单位: Department of Optical and Electronic Engineering,Ordnance Engineering College Shijiazhuang 050003,China

会议类型: 国际会议

会议名称: 2009 9th International Conference on Electronic Measurement & Instruments(第九届电子测量与仪器国际会议 ICEMI2009)

会议地点: 北京

会议语种:英文

页码: 1766-1769

在线出版日期: 2009-08-16（万方平台首次上网日期，不代表论文的发表时间）