Title :
Active 2nd-order intermodulation calibration for direct-conversion receivers
Author :
Chen, Minghui ; Wu, Yue ; Chang, M. Frank
Author_Institution :
California Univ., Los Angeles, CA
Abstract :
A temperature-compensated active IM2 calibration circuit for direct-conversion receivers is fabricated with a mixer in 0.25mum CMOS. A squaring circuit senses the RF signal and generates a calibration current to cancel mixer IM2 distortion. The loading effect and noise contribution are minimized by gain boosting. IIP2 is boosted >20dB to >80dBm in the IMT band. The calibration circuit draws 1.5mA
Keywords :
CMOS integrated circuits; intermodulation distortion; mixers (circuits); radio receivers; 0.25 micron; 1.5 mA; CMOS process; RF signal; active IM2 calibration circuit; active second-order intermodulation calibration; direct-conversion receivers; gain boosting; mixer IM2 distortion; Bandwidth; Calibration; Circuits; Degradation; Intermodulation distortion; Noise reduction; Nonlinear distortion; Radio frequency; Radiofrequency amplifiers; Temperature;
Conference_Titel :
Solid-State Circuits Conference, 2006. ISSCC 2006. Digest of Technical Papers. IEEE International
Conference_Location :
San Francisco, CA
Print_ISBN :
1-4244-0079-1
DOI :
10.1109/ISSCC.2006.1696240
