A 60-GHz Four-Element Beam-Tapering Receive Phased Array

A 60-GHz four-element beam-tapering receive phased array is proposed in this study. The proposed receive phased array channel cover a phase control range of 360° using a 3-bit 180° phase shifter and a phase invertible low noise amplifier (PILNA) to achieve low power consumption and high gain. Moreover, by applying the beam-tapering technique without additional DC power consumption through a passive attenuator, interference from unwanted direction can be suppressed. The receive phased array fabricated in 65-nm CMOS process occupies a size of 2.8 mm
²
. From the measurement results, the proposed circuit shows an average peak gain of 26.1 dB and a 3-dB bandwidth of 15 GHz from 52 to 67 GHz, covering 360° phase control range with a 22.5° phase resolution. Between 57 to 67 GHz, the RMS phase and gain errors during gain control are less than 7° and 1.25 dB, respectively. Furthermore, by providing 5-dB of gain control through the attenuator with less than 4° phase error, the beam-tapering function can be supported.