Low RMS phase error 28 GHz 5‐bit switch type phase shifter for 5G applications

A 28 GHz 5‐bit switch‐type phase shifter (STPS) using 0.18 μm CMOS technology is presented for 5G mobile communication applications. Utilising a process variation insensitive transmission line‐based bridged T‐type topology for 11.25°, 22.5°, 45°, 90° 1‐bit phase shifters and high‐pass/low‐pass network switched‐path‐type topology for 180° 1‐bit phase shifter, the 5‐bit STPS achieves ultra‐low root mean square (RMS) phase error of 1.7° and low RMS amplitude error of 0.59 dB at 28 GHz with intrinsic digital phase‐control mechanism. The measured insertion loss of all 32 states is 15 ± 1.5 dB at 28 GHz with zero dc consumption.