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A tunable concurrent 6-to-18GHz phased-array system in CMOS

TitleA tunable concurrent 6-to-18GHz phased-array system in CMOS
Publication TypeConference Paper
Year of Publication2008
AuthorsWang, H., S. Jeon, Y-J. Wang, F. Bohn, A. Natarajan, A. Babakhani, and A. Hajimiri
Conference NameIEEE MTT-S International Microwave Symposium Digest - MTT 2008
Pagination687 - 690
Date Published06/2008
Conference LocationAtlanta, GA
ISBN Number978-1-4244-1780-3
Keywordsarray signal processing, beam steering, CMOS integrated circuits, interference suppression, phased-array radars

This paper presents a scalable phased-array receiver system that covers a tritave bandwidth of 6-to-18 GHz implemented in a 130 nm CMOS process. The single receiver element with a 10-bit phase shifting resolution achieves a maximum phase error of 2.5deg within a baseband amplitude variation of 1.5 dB for an arbitrary target angle. This dense interpolation provides excellent phase error/offset calibration capability in the array. A 4-element electrical array pattern is measured at 6 GHz, 13.5 GHz and 18 GHz, showing a worst case peak-to-null ratio of 21.5 dB. The EVM and phase noise improvements of the array compared with the single receiver element are also shown.