A low power, 2×2 V-band beamforming receiver array using a local-oscillator (LO) phase-shifting approach is presented in this paper. Significant power savings in LO routing is achieved using an 8th sub-harmonic injection locked oscillator (SHILO), used for both frequency-multiplication and programmable phase-shift to implement beamforming. SHILO generates mm-Wave phase shift of ±90°. For low power, a low-noise amplifier (LNA) and mixer are operated using 1.3 V, while SHILO operates at only 0.5 V supply. The receiver is fabricated in TowerJazz 0.13 μm SiGe BiCMOS process and occupies total area of just 1×2 mm2. A single receiver consumes 11.4 mW power, with a peak gain of 8.23 dB, minimum noise figure (NF) of 7.7 dB, and 3-dB bandwidth of >11 GHz. The 2×2 array achieves a peak-to-null ratio of 21 dB.
['Suman Prasad Sah', 'Pawan Agarwal', 'Deukhyoun Heo']
A low power sub-harmonic injection locked 2×2 mm-wave beamforming receiver array