A 6-bit 11–14 GHz Ku-band Phase Shifter in 28nm CMOS

This paper presents a 6-bit passive switched-type phase shifter operating from 11 to 14 GHz in the Ku frequency band. The phase shifter comprises six phase shifting blocks with a phase coverage of 354.375° and a 5.625° phase resolution for the LSB. The 180°/90°, 45°/22.5°, and 11.25°/5.625° phase shifting blocks are implemented using switch-type high-pass/low-pass, bridged T-type, and band-pass/low-pass topology, respectively. The phase shifter is designed in a TSMC 28nm CMOS technology node. Post-layout simulation results over all 64 states show that insertion loss is 9.7±2.3 dB, and the RMS phase error is less than 2° in the 11–14 GHz range. The input/output return loss is maintained better than 7.5 dB across all states, and the noise figure of the phase shifter remains below 11.3 dB across all states throughout the entire bandwidth. The overall size of the phase shifter core is 1.3mm x 0.4mm.