A Distributed Analogue CMOS Phase Shifter with Shielded Transmission Line

A novel wideband analogue phase shifter using shielded transmission line and slow-wave Coplanar Waveguide (CPW) is implemented using CMOS 130 nm technology. With no power consumption and a compact length of 1 mm the phase shifter has the capability of generating a phase difference of about 60deg at 10 GHz, where the insertion loss varies from -2.6 dB at -1.5V to -3.8 dB at 1.5 V. The design has been characterized up to 40 GHz and demonstrates competitive capabilities in terms of performance, size, control voltage and linearity with the state of the art CMOS distributed analogue phase shifters. Linearity measurements reveal that the 1-dB compression point at 10 GHz is about +14.7 dBm. This design shows the opportunities existing for monolithically integration of a low loss and compact phase shifter in CMOS technology.