A 0.13-μm CMOS Digital Phase Shifter for K-band Phased Arrays

A 4-bit active digital phase shifter integrated with digital control circuitry in 0.13-μm CMOS technology is developed for K-band multiple antenna arrays. The active phase shifter synthesizes the required phase using a phase interpolation process by adding quadrature phased input signals. The phase shifter uses a resonance-based quadrature all-pass filter for quadrature signaling with minimum loss and wide bandwidth. The phase shifter exhibits 6.5-13° of
rms
phase error at 15-26 GHz. The average voltage gain ranges from -4.6 dB at 15 GHz to -3 dB at 24.5-26 GHz. Input P1dB is typically -0.8±1.5 dBm at 24 GHz for overall phase states. The core area of the phase shifter is 0.33×0.43 mm
²
, with a current consumption of 7.8 mA from a 1.5 V supply voltage.