A 24-GHz SiGe Phased-Array Receiver—LO Phase-Shifting Approach
A local-oscillator phase-shifting approach is introduced to implement a fully integrated 24-GHz phased-array receiver using an SiGe technology. Sixteen phases of the local oscillator are generated in one oscillator core, resulting in a raw beam-forming accuracy of 4 bits. These phases are distributed to all eight receiving paths of the array by a symmetric network. The appropriate phase for each path is selected using high-frequency analog multiplexers. The raw beam-steering resolution of the array is better than 10 [degrees] for a forward-looking angle, while the array spatial selectivity, without any amplitude correction, is better than 20 dB. The overall gain of the array is 61 dB, while the array improves the input signal-to-noise ratio by 9 dB.
"©2005 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE." Manuscript received April 23, 2004; revised August 11, 2004. This work was supported in part by the National Science Foundation and by the Lee Center for Advanced Networking. The authors would like to thank A. Natarajan, R. Aparicio, D. Lu, M. Morgan, and Prof. D. Rutledge, all of the California Institute of Technology, Pasadena, for valuable technical discussions. The authors acknowledge N. Wadefalk, and A. Shen, both of the California Institute of Technology, both of whom assisted in printed circuit board and microwave package preparation. The original version of the software for programming the phased-array receiver was provided by R. Chunara, California Institute of Technology.