摘要
针对国内星载数传发射机无法实现载波频率灵活可变的问题,提出了一种可配置输出频率的载波源方案。采用现场可编程门阵列(FPGA)和数模转换器(DAC)相结合,实现参考频率高精度可变且灵活配置锁相环(PLL)中鉴相器的鉴相频率,使载波源输出频率可程控配置。实测结果表明,载波源可实现任意配置X波段8.025~8.4 GHz的输出中心频点,相位噪声优于-66 dBc/Hz@100 Hz、-75 dBc/Hz@1 kHz、-80 dBc/Hz@10 kHz、-95 dBc/Hz@100 kHz、-120 dBc/Hz@1 MHz,杂散抑制度优于-74 dBc,频率分辨率小于10 Hz。相关电路替代专用直接数字频率合成(DDS)芯片的功能,能适应空间应用环境。
Aiming at the problem that the domestic space-borne data transmitter cannot achieve flexible and variable carrier frequency,a scheme of carrier source with configurable output frequency was proposed.The highly accurate and variable reference frequency and flexible configuration of the phase detection frequency in the phase detector in the phase-locked loop(PLL)were realized to make the output frequency of the carrier source programmable configuration by combining the field programmable gate array(FPGA)and digital-to-analog converter(DAC).The measured results from the carrier source with programmed output frequency were shown that the function for arbitrarily configuring output center frequency points in the X-band frequency range of 8.025~8.4 GHz could be realized,and the phase noise were less than-66 dBc/Hz@100 Hz、-75 dBc/Hz@1 kHz、-80 dBc/Hz@10 kHz、-95 dBc/Hz@100 kHz、-120 dBc/Hz@1 MHz,the spurious suppression was below-74 dBc,the frequency resolution was less than 10 Hz.The related circuit can replace the function of the dedicated direct digital frequency synthesis(DDS)chip and can be adapted to the space applications environment.
作者
谌德军
宋嵩
梁显锋
CHEN Dejun;SONG Song;LIANG Xianfeng(National Space Science Center, Chinese Academy of Sciences, Beijing 100190,China;University of Chinese Academy of Sciences, Beijing 100190,China;Synopsys Inc. Beijing Office, Beijing 100086,China)
出处
《压电与声光》
CAS
北大核心
2020年第4期433-438,共6页
Piezoelectrics & Acoustooptics
基金
中国科学院战略性先导科技专项(A类)基金资助项目(XDA22000000)。
