A 24–30GHz 7-Bit Passive Hybrid Phase Shifter with <1.1° RMS Phase Error and <0.61dB 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 a vector-modulated phase shifter (VMPS) and a 1-bit switch-type phase shifter (STPS). A novel phase range partitioning method is proposed to reduce phase errors without the need for time-consuming and complicated calibration. 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) exceeds 15 dBm.