TY - GEN
T1 - Transmit-receive cross-modulation distortion correction in a 5-6GHz full duplex quadrature balanced CMOS RF front-end
AU - Ginzberg, Nimrod
AU - Gidoni, Tomer
AU - Regev, Dror
AU - Cohen, Emanuel
N1 - Publisher Copyright:
© 2020 IEEE.
PY - 2020/8
Y1 - 2020/8
N2 - In this work, we propose an analysis, characterization, and correction of transmit-receive cross-modulation (CM) distortion in a full duplex quadrature balanced CMOS RF front-end around the carrier frequency of 5.2 GHz. A theoretical model of the CM mechanism stemming from instantaneous variations in the power amplifiers' output impedance is laid out and verified in measurement. A two-dimensional digital post-distortion (2D-DPoD) algorithm is employed to linearize the CM distorted receive signal, in conjunction with wideband digital RF and baseband self-interference cancellation. The system was measured in a simultaneous transmit-receive operation using 802.11ac VHT20 signals at 10 dBm RMS Tx power and -17 dBm Rx power and achieves total Tx-Rx isolation >66 dB. The digital SIC and 2D-DPoD correct Rx EVM by 16 dB to a value of -32.5 dB.
AB - In this work, we propose an analysis, characterization, and correction of transmit-receive cross-modulation (CM) distortion in a full duplex quadrature balanced CMOS RF front-end around the carrier frequency of 5.2 GHz. A theoretical model of the CM mechanism stemming from instantaneous variations in the power amplifiers' output impedance is laid out and verified in measurement. A two-dimensional digital post-distortion (2D-DPoD) algorithm is employed to linearize the CM distorted receive signal, in conjunction with wideband digital RF and baseband self-interference cancellation. The system was measured in a simultaneous transmit-receive operation using 802.11ac VHT20 signals at 10 dBm RMS Tx power and -17 dBm Rx power and achieves total Tx-Rx isolation >66 dB. The digital SIC and 2D-DPoD correct Rx EVM by 16 dB to a value of -32.5 dB.
KW - 2D-DPD
KW - CMOS
KW - Cross-modulation distortion
KW - Full duplex
KW - Post-distortion
KW - Power amplifiers
KW - Quadrature balanced transmitter
KW - RF front-end
KW - Simultaneous transmit-receive
UR - http://www.scopus.com/inward/record.url?scp=85094189924&partnerID=8YFLogxK
U2 - 10.1109/IMS30576.2020.9224029
DO - 10.1109/IMS30576.2020.9224029
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AN - SCOPUS:85094189924
T3 - IEEE MTT-S International Microwave Symposium Digest
SP - 1211
EP - 1214
BT - IMS 2020 - 2020 IEEE/MTT-S International Microwave Symposium
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2020 IEEE/MTT-S International Microwave Symposium, IMS 2020
Y2 - 4 August 2020 through 6 August 2020
ER -