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A four-input beam-forming downconverter for adaptive antennas

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5 Author(s)
Yamaji, T. ; Corporate Res. & Dev. Center, Toshiba Corp., Kawasaki, Japan ; Kurose, D. ; Watanabe, O. ; Obayashi, S.
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A four-input beam-forming downconverter for adaptive antennas is described. It consists of 2-bit variable gain amplifiers (VGAs), 5-bit local oscillator (LO) signal phase shifters using double RC-bridge circuits, and mixers. The VGAs adjust gain deviation between signal paths. A differential-signal-to-eight-phase-signal converter is employed as a part of the LO phase shifter to reduce the chip size. A maximum phase error of 4.1°, which is less than 1/2 LSB, is achieved. This error value indicates that the required phase shifter accuracy and the necessary isolation between the VGAs has been achieved. This beam-forming IC is applicable to receivers with adaptive antennas, and is expected to help to reduce the costs of adaptive antenna systems.

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Solid-State Circuits, IEEE Journal of  (Volume:38 ,  Issue: 10 )