Title :
A CMOS Amplifier with Third-Order Intermodulation Distortion Cancellation
Author :
Jackson, Brad R. ; Saavedra, Carlos E.
Author_Institution :
Dept. of Electr. & Comput. Eng., Queen´´s Univ., Kingston, ON
Abstract :
A 2.4 GHz CMOS amplifier with third-order intermodulation distortion cancellation is presented based on the derivative superposition technique. The proposed circuit uses a conventional amplifier topology followed by a distortion cancellation circuit that can significantly improve third-order linearity. To quantify the linearity improvement, two general-purpose amplifiers were fabricated and measured: (1) a traditional cascode amplifier and (2) an identical cascode amplifier followed by a distortion cancellation circuit. The new amplifier increases the IP3 by approximately 12 dB without having a significant effect on either the gain or noise characteristics of the original amplifier.
Keywords :
CMOS integrated circuits; amplifiers; intermodulation distortion; CMOS amplifier; conventional amplifier topology; general-purpose amplifiers; identical cascode amplifier; third-order intermodulation distortion cancellation; third-order linearity; Circuit noise; Circuit topology; Distortion measurement; FETs; Feedback; Intermodulation distortion; Linearity; Noise figure; Power amplifiers; Predistortion;
Conference_Titel :
Silicon Monolithic Integrated Circuits in RF Systems, 2009. SiRF '09. IEEE Topical Meeting on
Conference_Location :
San Diego, CA
Print_ISBN :
978-1-4244-3940-9
Electronic_ISBN :
978-1-4244-2831-1
DOI :
10.1109/SMIC.2009.4770538
