Using auxiliary amplifier to cancel third-order intermodulation distortion for a 1.9 GHz CMOS linear amplifier design

Author

Liang, Kung-Hao ; Ho, Chien-Chih ; Hsieh, Meng-Wei ; Chan, Yi-Jen

Author_Institution

Dept. of Electr. Eng., Nat. Central Univ., Chungli, Taiwan

fYear

2005

Firstpage

237

Lastpage

240

Abstract

A new linearization method for microwave amplifier design, by canceling the third-order intermodulation component, is proposed. The main amplifier is combined with an auxiliary amplifier, whose gain and bias conditions are appropriately designed. The output frequency spectra of the main amplifier are subtracted by this auxiliary amplifier. The third-order distortion is canceled since these two amplifiers are designed as a differential-pair stage. IIP₃ improvement as large as 11 dB has been obtained, where this amplifier achieves a 11.5 dB gain at 1.9 GHz, and is fabricated using 0.18 μm CMOS technologies. The circuit consumed 11.5 mA or 11 mA for the auxiliary amplifier on or off, respectively. The auxiliary amplifier consumes less than 0.8 mW DC power and causes only 0.2 dB gain reduction of the main amplifier.

Keywords

UHF amplifiers; UHF integrated circuits; differential amplifiers; integrated circuit design; intermodulation distortion; linearisation techniques; nonlinear distortion; power consumption; 0.18 micron; 1.9 GHz; 11 mA; 11.5 dB; 11.5 mA; CMOS linear amplifier design; auxiliary amplifier; differential-pair stage; microwave amplifier design; power consumption; third order input intercept point; third-order distortion; third-order intermodulation distortion cancellation; CMOS technology; Circuit topology; Design engineering; Gain; Intermodulation distortion; Linearity; Microwave amplifiers; Microwave theory and techniques; Power amplifiers; Radiofrequency amplifiers;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio Frequency integrated Circuits (RFIC) Symposium, 2005. Digest of Papers. 2005 IEEE

ISSN

1529-2517

Print_ISBN

0-7803-8983-2

Type

conf

DOI

10.1109/RFIC.2005.1489642

Filename

1489642