低相噪全相参毫米波频率合成源研究  

RESEARCH ON MM-WAVE FREQUENCY SYNTHESIZER WITH LOW PHASE NOISE AND FULL-PHASE-COHERENCE

作　　者：徐锐敏[1] 姚鸿飞[1] 蔡竟业[2] 

机构地区：[1]电子科技大学电子工程学院,四川成都610054 [2]电子科技大学通信与信息工程学院,四川成都610054

出　　处：《红外与毫米波学报》2007年第3期222-224,231,共4页Journal of Infrared and Millimeter Waves

基　　金：国防重点实验室基金项目(SJ03021)

摘　　要：研制出一种小步进全相参毫米波频率合成源.本振部分,对直接数字式合成频率、参考分频比和环路分频比进行三重调节,抑制了直接数字频率合成的杂散,提高了频率分辨率;发射部分,采用二次混频电路,避免了调谐电压预置,简化了电路,并保证了发射信号和本振信号相参.该系统输出在Ka频段,带宽400MHz,步进<1MHz.测试相噪<-90dBc/Hz@10kHz、-97dBc/Hz@100kHz,杂散为-60dBc,跳频时间<15us.A mm-wave frequency synthesizer with small step and full-phase-coherence was developed. For LO（ local oscillator） section, DDS（ direct digital frequency synthesis） frequency, reference divider and PLL（phase locked loop） divider are triple tuned, so that spurious components from DDS are suppressed and the frequency resolution is enhanced; For transmitter （TR） section, twice frequency-mixing is used, so the presetting of tuning voltage is avoided, the circuits are simplifed, and the phase coherence between TR and LO signals is ensured. The developed synthesizer with channel step below 1MHz achieves low spurious level of -60dBc, phase noise of -90dBc/Hz@ 10kHz,-97dBc/Hz@ 100kHz and switching time of 15us. The output frequency is within Ka band.

关 键 词：毫米波 频率合成源 相参 

分 类 号：TN527[电子电信]