现代电子技术
現代電子技術
현대전자기술
MODERN ELECTRONICS TECHNIQUE
2014年
21期
53-57,61
,共6页
FMCW%信号发生器%DDS%PLL
FMCW%信號髮生器%DDS%PLL
FMCW%신호발생기%DDS%PLL
FMCW%signal generator%DDS%PLL
随着FMCW雷达的应用领域越来越广泛，对于FMCW信号发生器的性能要求也越来越高。采用了DDS激励PLL的混合式频率合成技术对合成器相位噪声、杂散损耗和线性度等性能指标进行分析，在此基础上设计并实现了2.4 GHz载频FMCW信号发生器。其中DDS芯片AD9910产生低频段的线性调频信号，PLL芯片HMC820LP6CE通过倍频将低频段调频信号倍频到高频段，STM32为控制器。实测结果表明，该系统具有频率分辨率高、相噪低、杂散损耗小、捷变频时间短、线性度高的特点。其近端杂散为-59.64 dBc，远端杂散为-55.02 dBc，相位噪声在100 kHz处为-95.57 dBc/Hz，在400 kHz处为-118.38 dBc/Hz。
隨著FMCW雷達的應用領域越來越廣汎，對于FMCW信號髮生器的性能要求也越來越高。採用瞭DDS激勵PLL的混閤式頻率閤成技術對閤成器相位譟聲、雜散損耗和線性度等性能指標進行分析，在此基礎上設計併實現瞭2.4 GHz載頻FMCW信號髮生器。其中DDS芯片AD9910產生低頻段的線性調頻信號，PLL芯片HMC820LP6CE通過倍頻將低頻段調頻信號倍頻到高頻段，STM32為控製器。實測結果錶明，該繫統具有頻率分辨率高、相譟低、雜散損耗小、捷變頻時間短、線性度高的特點。其近耑雜散為-59.64 dBc，遠耑雜散為-55.02 dBc，相位譟聲在100 kHz處為-95.57 dBc/Hz，在400 kHz處為-118.38 dBc/Hz。
수착FMCW뢰체적응용영역월래월엄범，대우FMCW신호발생기적성능요구야월래월고。채용료DDS격려PLL적혼합식빈솔합성기술대합성기상위조성、잡산손모화선성도등성능지표진행분석，재차기출상설계병실현료2.4 GHz재빈FMCW신호발생기。기중DDS심편AD9910산생저빈단적선성조빈신호，PLL심편HMC820LP6CE통과배빈장저빈단조빈신호배빈도고빈단，STM32위공제기。실측결과표명，해계통구유빈솔분변솔고、상조저、잡산손모소、첩변빈시간단、선성도고적특점。기근단잡산위-59.64 dBc，원단잡산위-55.02 dBc，상위조성재100 kHz처위-95.57 dBc/Hz，재400 kHz처위-118.38 dBc/Hz。
With the more and more wide application of FMCW radar,the performance requirements of FMCW signal genera-tor is also more stringent. The DDS+PLL frequency synthesis technique was used to analyze the phase noise,stray loss and lineari-ty performance indexes of the synthesizer. Based on this,a 2.4 GHz FMCW signal generator was designed,in which DDS chip AD9910 generates low frequency chirp signal,PLL chip HMC820LP6CE as multiplier converts FM signal in low frequency to that in high frequency,and STM32 is taken as its controller. The experimental results show that the system has the characteris-tics of high frequency resolution,low phase noise,low stray loss,short frequency switching time,high linearity. Its proximal stray is -59.64 dBc,remote stray is -55.02 dBc,phase noise at 100 kHz is -95.57 dBc/Hz and at 400 kHz is -118.38 dBc/Hz.
