TY - GEN
T1 - A self-calibrated LC quadrature VCO in a current-limited region
AU - Byun, Sangjin
AU - Kim, Kwan Woo
AU - Lee, Dong Ho
AU - Laskar, Joy
AU - Kim, Cheon Soo
PY - 2008
Y1 - 2008
N2 - This paper presents a self-calibrated LC quadrature VCO (LC QVCO) which operates in a current-limited region. Our steady-state phasor analysis shows that phase and amplitude errors of an LC QVCO are linearly related to each other if the LC QVCO is designed to operate in a current-limited region. Based on this linear relationship, we propose a self-calibration technique which uses a low speed amplitude error detector instead of a conventional high speed phase error detector for I/Q error compensation of an LC QVCO. As a prototype, a 2.7GHz self-calibrated LC QVCO was implemented in a 0.18um CMOS process. The LC QVCO core and the self-calibration loop consume 7.6mA and 0.4mA from a 1.8V supply, respectively, and successfully compensate for phase and amplitude errors.
AB - This paper presents a self-calibrated LC quadrature VCO (LC QVCO) which operates in a current-limited region. Our steady-state phasor analysis shows that phase and amplitude errors of an LC QVCO are linearly related to each other if the LC QVCO is designed to operate in a current-limited region. Based on this linear relationship, we propose a self-calibration technique which uses a low speed amplitude error detector instead of a conventional high speed phase error detector for I/Q error compensation of an LC QVCO. As a prototype, a 2.7GHz self-calibrated LC QVCO was implemented in a 0.18um CMOS process. The LC QVCO core and the self-calibration loop consume 7.6mA and 0.4mA from a 1.8V supply, respectively, and successfully compensate for phase and amplitude errors.
KW - I/Q signal generation
KW - Self-calibration
KW - Voltage controlled oscillators
UR - http://www.scopus.com/inward/record.url?scp=51849163767&partnerID=8YFLogxK
U2 - 10.1109/RFIC.2008.4561458
DO - 10.1109/RFIC.2008.4561458
M3 - Conference contribution
AN - SCOPUS:51849163767
SN - 9781424418091
T3 - Digest of Papers - IEEE Radio Frequency Integrated Circuits Symposium
SP - 379
EP - 382
BT - Proceedings of the 2008 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2008
T2 - 2008 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2008
Y2 - 15 June 2008 through 17 June 2008
ER -