A 15GHz-Band 4-Channel Transmit/Receive RF Core-Chip for High SHF Wide-Band Massive MIMO in 5G

Koji TSUTSUMI; Takaya MARUYAMA; Wataru YAMAMOTO; Takanobu FUJIWARA; Tatsuya HAGIWARA; Ichiro SOMADA; Eiji TANIGUCHI; Mitsuhiro SHIMOZAWA

doi:10.1587/transele.E100.C.825

Special Section on Microwave and Millimeter-Wave Technology

A 15GHz-Band 4-Channel Transmit/Receive RF Core-Chip for High SHF Wide-Band Massive MIMO in 5G

Koji TSUTSUMI, Takaya MARUYAMA, Wataru YAMAMOTO, Takanobu FUJIWARA, Tatsuya HAGIWARA, Ichiro SOMADA, Eiji TANIGUCHI, Mitsuhiro SHIMOZAWA

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Keywords: massive MIMO, active phased array antenna, high SHF, phase shifters, variable gain amplifiers, CMOS integrated circuits

JOURNAL RESTRICTED ACCESS

2017 Volume E100.C Issue 10 Pages 825-832

DOI https://doi.org/10.1587/transele.E100.C.825

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Abstract

A 15GHz-band 4-channel transmit/receive RF core-chip is presented for high SHF wide-band massive MIMO in 5G. In order to realize small RF frontend for 5G base stations, both 6bit phase shifters (PS) and 0.25 dB resolution variable gain amplifiers (VGA) are integrated in TX and RX paths of 4-channels on the chip. A PS calibration technique is applied to compensate the error of 6bit PS caused by process variations. A common gate current steering topology with tail current control is used for VGA to enhance the gain control accuracy. The 15GHz-band RF core-chip fabricated in 65 nm CMOS process achieved phase control error of 1.9deg. rms., and amplitude control error of 0.23 dB. rms.

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