采用CMOS工艺的C波段5bit数字移相器设计

Design of C-band 5 bit digital phase shifter based on CMOS technology

基于SMIC 0.13μm CMOS工艺,采用片上巴伦、正交全通滤波器和吉尔伯特单元的设计方案,设计了一款C波段5 bit数字移相器.巴伦将单端输入信号分成两路反相的差分信号,并通过吉尔伯特单元将正交全通滤波器产生的正交信号进行矢量运算.在满足移相精度11.25°的条件下,实现4.5~7.5 GHz的工作带宽.电磁场仿真结果显示:在4.5~7.5 GHz频段,数字移相器插入损耗的典型值是-10 dB;输入回波损耗和输出回波损耗分别优于-10.6 dB和-9.9 dB;RMS移相精度小于3.5°;芯片面积1.66 mm×0.74 mm;该5 bit MMIC数字移相器相对带宽为50%,适用于5G低频段的通信系统中.

Based on SMIC 0.13μm CMOS technology,a C-band 5 bit digital phase shifter was designed by using on-chip Barron,orthogonal all-pass filter and Gilbert cell.The balun divided the input signal at one end into two inverse differential signals,and then carried out vector operation on the quadrature signals generated by the quadrature all-pass filter through Gilbert cell.The bandwidth of 4.5~7.5 GHz was achieved when the phase-shifting accuracy was 11.25 degrees.The simulation results of electromagnetic field showed that the typical insertion loss of digital phase shifter was-10 dB at 4.5-7.5 GHz;the input and output return losses were better than 10.6 dB and-9.9 dB,respectively;the phase shifting accuracy of RMS was less than 3.5 degrees,the size of the layout was 1.66 mm x 0.74 mm;and the relative bandwidth of the 5 bit MMIC digital phase shifter was 50%,which was suitable for 5 G low frequency communication system.