TY - GEN
T1 - A Digital I/Q Correction Technique for a 125-GHz Interferometric Radar with Sub-Micrometer Sensitivity
AU - Rodriguez, Daniel
AU - Li, Changzhi
N1 - Funding Information:
ACKNOWLEDGMENT The authors wish to acknowledge National Science Foundation (NSF) for funding support under Grant 1808613 and 1718483, Silicon Radar for providing the radar chip, and Dr. Tim Dallas at Texas Tech University for providing the optical table for experiment.
Publisher Copyright:
© 2019 IEEE.
PY - 2019/6
Y1 - 2019/6
N2 - Signal deterioration due to I/Q mismatch may happen in all quadrature direct-conversion receivers, destroying the orthogonality of the demodulated signal and causing a mirrored signal to appear superimposed to the desired signal. This effect is even more pronounced for radar systems over 100 GHz since they are sensitive to small fabrication errors. In addition, for ac-coupled interferometric radars measuring slow movements, coupling distortion is present. In this paper, these issues were analyzed for interferometric radars and then resolved using a novel phase imbalance correction method on a 125 GHz radar. The effectiveness of the proposed solution was verified experimentally. A high sensitivity was demonstrated by successfully measuring a 95-nm sinusoidal movement.
AB - Signal deterioration due to I/Q mismatch may happen in all quadrature direct-conversion receivers, destroying the orthogonality of the demodulated signal and causing a mirrored signal to appear superimposed to the desired signal. This effect is even more pronounced for radar systems over 100 GHz since they are sensitive to small fabrication errors. In addition, for ac-coupled interferometric radars measuring slow movements, coupling distortion is present. In this paper, these issues were analyzed for interferometric radars and then resolved using a novel phase imbalance correction method on a 125 GHz radar. The effectiveness of the proposed solution was verified experimentally. A high sensitivity was demonstrated by successfully measuring a 95-nm sinusoidal movement.
KW - I/Q imbalance
KW - Interferometric radar
KW - distortion
KW - phase mismatch
KW - signal integrity
UR - http://www.scopus.com/inward/record.url?scp=85069966321&partnerID=8YFLogxK
U2 - 10.1109/mwsym.2019.8701003
DO - 10.1109/mwsym.2019.8701003
M3 - Conference contribution
AN - SCOPUS:85069966321
T3 - IEEE MTT-S International Microwave Symposium Digest
SP - 301
EP - 304
BT - 2019 IEEE MTT-S International Microwave Symposium, IMS 2019
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2019 IEEE MTT-S International Microwave Symposium, IMS 2019
Y2 - 2 June 2019 through 7 June 2019
ER -