A 51.5 - 64.5 GHz Active Phase Shifter Using Linear Phase Control Technique With 1.4° Phase resolution in 65-nm CMOS

This paper presents a V-band active phase shifter using proposed linear phase control technique with 1.4° phase step in 65-nm CMOS technology. Different from conventional active phase shifter, the linear phase control technique achieves a linear relationship between output phase and control signals. It makes the control of output phase more accurate and greatly improves the phase resolution. Furthermore, a current-reuse technique is used to improve gain in mm-wave frequency. The measurement results show that the measured 3-dB bandwidth of 51.5 ~ 64.5 GHz is achieved. The measured RMS phase error of 8-bit phase resolution is 0.5° ~ 1.2° in 3-dB bandwidth and the measured RMS gain variation error is 0.17 ~ 0.25 dB. The measured input-referred P1dB at maximum gain phase states is -5 dBm. The chip consumes 16.9 mA from 1.2 V voltage supply and the core area of the phase shifter is 720 um × 560 um.