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A 60-GHz receiver (RX) front-end chip fabricated in 90 nm CMOS process is presented. The RX chip consists of an LNA, a downconversion mixer, and a phase-locked loop synthesizer. The RX chip is capable of generating LO signal from phase-locked synthesizer. The components of the RX chip employ fully differential architecture to avoid influences of parasitic components and operate with low LO signal amplitude. Measured power gain and NF of 22 dB and 8.4 dB were obtained at 61.5 GHz, respectively, and the RX chip receives a radio signal with an on-chip dipole antenna. These results indicate the possibility of realization of a CMOS single-chip 60-GHz transceiver.

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We propose utilizing a radio-over-fiber technique of optical subcarrier-multiplexing transmission for radio base stations (BSs) with adaptive array antennas. The proposed system can be constructed at low cost since only one optical transmitter and receiver is required for a center station and a BS. Moreover, relative phases among antenna branches are insensitive to equivalent length fluctuation of an optical fiber.Index Terms-Land mobile radio equipment, microwave antenna arrays, optical fiber communication, phase-locked loop, subcarrier multiplexing.

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