Title :
Magnetic-Feedback-Based Predistortion Method for Low-Noise Amplifier Linearization
Author :
Vitzilaios, Georgios ; Papananos, Yannis ; Theodoratos, Gerasimos ; Vryssas, Konstantinos S.
Author_Institution :
Dept. of Electr. & Electron. Eng, Nat. Tech. Univ. of Athens
Abstract :
A predistortion method for CMOS low-noise amplifiers (LNAs) to be used in broadband wireless applications is presented. The method is based on the nulling of the third-order intermodulation distortion of the main amplifier by a highly nonlinear predistortion branch. Maximum nonlinearity product cancellation is ensured by a transformer feedback method. The technique improves linearity in a wide range of input power without significant gain and noise figure (NF) degradation. Simulation results on a 1-V LNA indicate a 10.3-dB improvement in the third-order input intercept point with a degradation of only 1 and 0.44 dB in amplifier gain and NF, respectively. The design is based on a 0.13-mum CMOS technology
Keywords :
CMOS analogue integrated circuits; feedback; intermodulation distortion; linearisation techniques; low noise amplifiers; 0.13 micron; 0.44 dB; 1 dB; CMOS analog circuit design; intermodulation distortion; low-noise amplifier; magnetic feedback; nonlinear predistortion; transformer feedback; Broadband amplifiers; CMOS technology; Degradation; Feedback; Intermodulation distortion; Linearity; Low-noise amplifiers; Noise figure; Noise measurement; Predistortion; CMOS analog circuit design; integrated transformers; low-noise amplifier (LNA); predistortion;
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
DOI :
10.1109/TCSII.2006.884115
