Topology selection of switch-type phase shifter units for wideband Ka-band 5-bit phase shifter with low RMS errors

This article discusses different topologies of switch-type phase shifter units and the effects of such units on phase accuracy and loss variation for wideband operation. It is observed that the optimal selection of topology depends on the value of phase shift. This article discusses a Ka-band 5-bit switch-type phase shifter MMIC with T-type high-pass topology, T-type low-pass topology, and high-pass/low-pass switched-path-type topology. This circuit was implemented through a 65-nm CMOS process. This phase shifter has low RMS phase error of 2.4 degrees-6.2 degrees and low RMS amplitude error of 0.48-0.66 dB over the 32-41 GHz.