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

fYear

2009

fDate

19-21 Jan. 2009

Firstpage

1

Lastpage

4

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/SMIC.2009.4770538

Filename

4770538