一种基于高速电流舵DAC的射频DDFS电路  

A RF Direct Digital Frequency Synthesizer Circuit with High-speed Current-steering DAC

作　　者：张涛[1] 于宗光[1] 张甘英[1] 苏小波[1] 邱丹 ZHANG Tao;YU Zong-guan;ZHANG Gan-ying;SU Xiao-bo;QIU Dan(China Electronics Technology Group Corporation No.58 Research Institute,Wuxi 214035,China)

机构地区：[1]中国电子科技集团公司第58研究所

出　　处：《中国电子科学研究院学报》2019年第11期1178-1182,共5页Journal of China Academy of Electronics and Information Technology

摘　　要：本文介绍了一种基于高速电流舵DAC的射频直接式数字频率合成器电路,提出了一种四路交织架构,在接收级引入多相时钟的同时,应用相位检测保证高速数据与时钟的不交叠,有效提高了系统的工作频率。电路采用65 nm 1P8M数模混合CMOS工艺设计制造,芯片面积为4.85×4.85 mm^2,电路经实际测试工作频率范围为400 MHz^3.6 GHz,在时钟采样频率3.6 GHz,输出频率1.44 GHz时,宽带SFDR为46 dB c,窄带SFDR为78 dBc。A new type of RF Direct Digital Frequency Synthesizer with high-speed current-steering DAC is presented.In the Synthesizer,a interlacing structure with four channels has been proposed.A multiphase clock is introduced at the receiving terminal while Phase detection is utilized to remove the overlapping of the transmitting data and the clock,effectively increasing the working frequency.This circuit is fabricated through 65 nm 1P8M Mixed-Signal CMOS process technology,occupies a die area of 4.85×4.85 square min-meters.The results demonstrate that this circuit can operate at the frequency ranging from 400 MHz to 3.6 GHz,its wide-band SFDR and narrow-band SFDR are 46 dBc and 81 dBc respectively at the output frequency 1.44 GHz with a sampling rate of 3.6 GHz.

关 键 词：频率合成 数模转换器 电流舵 并行架构 

分 类 号：TN792[电子电信—电路与系统]