A 24-30 GHz 7-bit Passive Hybrid Phase Shifter with <1.1° RMS Phase Error and <0.61 dB Amplitude Error

This paper presents a 24-30 GHz 7-bit passive hybrid phase shifter with low rms phase and amplitude error, which consists of the vector-modulated phase shifter (VMPS) and a 1-bit switch-type phase shifter (STPS). To reduce the phase error without time-consuming and complicated phase calibration process, a novel method for partitioning the phase shifting range is proposed. To minimize the amplitude error for different phase states, a compact capacitive-compensation STPS is introduced. Fabricated with a 65nm bulk CMOS process, the proposed passive hybrid phase shifter has a core chip area of merely 0.118mm². Only 7-bit control bits are used to achieve the 360° phase shifting range and 5.625° phase resolution. The measurement results show that the proposed passive hybrid phase shifter achieves <1.1°/<0.61 dB RMS phase/amplitude error, respectively. At 24 GHz, the measured input 1-dB compression point (IP1dB) is >15dBm.