6-bit CMOS phase shifter and attenuator based on time-modulation for Ku-band phased array applications

Quasi-single sideband time modulation (QSSB-TM) topology is adopted to design high precision 6-bit phase and amplitude circuit in 0.13-um CMOS technology. The excellent amplitude and phase performance are realized with QSSB-TM circuit composed of a 90° power divider, two 180°phase shifters and a 0°Wilkinson power divider in 14-18GHz. The max root mean square (RMS) phase error is 0.2° in the 6-bit phase shifter mode. The max RMS amplitude error is 0.63dB in the 6-bit attenuator mode. The chip size is $\boldsymbol{1.5}\mathbf{mm}^{*}\boldsymbol{1.7}\mathbf{mm}(\boldsymbol{2.55}\mathbf{mm}^{2})$.