A 27–29.5GHz 6-Bit Phase Shifter with 0.67 −1.5 degrees RMS Phase Error in 65nm CMOS

Abstract

A 27-29.5GHz 6-bit switch-type phase shifter (PS) using 65nm CMOS process is presented in this paper. The PS incorporates 6 series phase shift bits to realize the relative phase shift varying from 0° to 354.375° with a step of 5.625°. Novel design approaches for phase shift bit and bits cascading sequence are proposed to improve the bandwidth and the RMS phase error. The post-layout simulation results show that the PS exhibits an ultra-low RMS phase error of 0.67°-1.5° and RMS gain error of 0.63dB-0.8dB from 27GHz to 29.5GHz. The input and output return loss are both better than −10dB and the core size iS $0.90\times 0.35\text{mm}^{2}$.