A Ka-Band 6-Bit Switched-Type CMOS Phase Shifter with Low RMS Amplitude Error

In this paper, a Ka-band switched-type 6-bit phase shifter is designed in 55-nm CMOS process. The bridged T-type topology is utilized for phase-shift bits of 5.625°, 11.25°, 22.5°, and 45°, while the high-low pass type topology is employed for phase-shift bits of 90° and 180°. Capacitive compensation technique is used for the 45° unit to minimize amplitude errors. Based on the simulation results, the designed 6-bit phase shifter has a root mean square (RMS) phase error of less than 5.2° at the operating frequencies from 36.5 GHz to 40 GHz, while the RMS amplitude error is better than 0.62 dB. The simulated insertion loss is 13 ± 2 dB over all 64 states.