Title :
Spatial Interferer Rejection in a Four-Element Beamforming Receiver Front-End With a Switched-Capacitor Vector Modulator
Author :
Soer, Michiel C M ; Klumperink, Eric A M ; Nauta, Bram ; Van Vliet, Frank E.
Author_Institution :
IC-Design Group, Univ. of Twente, Enschede, Netherlands
Abstract :
A 1-4-GHz 4-element phased array receiver front-end demonstrates spatial interferer rejection using null steering. Element phase and amplitude control are performed by a switched-capacitor vector modulator with integrated downconversion, utilizing a rational sine/cosine approximation. The 65-nm CMOS receiver achieves more than 20 dB of spatial interferer rejection up to an angular separation of 15°.
Keywords :
antenna phased arrays; array signal processing; modulators; receiving antennas; 4-element phased array receiver front-end; amplitude control; angular separation; four-element beamforming receiver front-end; null steering; spatial interferer rejection; switched-capacitor vector modulator; Array signal processing; Phase modulation; Phase shifters; Receivers; Switched capacitor networks; Beamforming; interference nulling; mixer; phase shifter; phased arrays; receivers; spatial filtering; switched-capacitor; vector modulator;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2011.2163553
