An Ultra Broadband Passive Vector Modulator Phase Shifter

This letter presents an ultra-broadband passive vector modulator phase shifter applied to a 4-element tranceiver. A compact cascaded three-stage differential coupler with anti-jamming connective mode and orthogonal placement method is presented, which amalgamates the through-path and coupled-path signal to reduce the phase and magnitude error of the wideband I/Q generator. A magnetic coupling enhanced lattice power synthesizer is proposed, which synthesizes I/Q signals for the accurate wideband target phase interpolation. The proposed phase shifter occupies an extraordinary compact chip area (1.6mm-by-0.6mm) in 0.13μm CMOS process. Measurement results demonstrates that the proposed phase shifter achieves high precision with maximum RMS phase and magnitude error 3.5° and 0.82dB, respectively, in the range of 3∼16GHz. In addition, simulated IP1dB is as high as +19dBm with no power consumption.