A High IIP2 Mixer Enhanced by a New Calibration Technique for Zero-IF Receivers

Author

Vahidfar, Mohammad Bagher ; Shoaei, Omid

Author_Institution

Univ. degli studi di Pavia, Pavia

Volume

55

Issue

3

fYear

2008

fDate

3/1/2008 12:00:00 AM

Firstpage

219

Lastpage

223

Abstract

The second-order intercept point (IP2) performance of direct conversion receivers is limited by the second-order nonlinearity of the mixer. A new technique which is based on calibrating mixer by injecting a programmable nonlinear current into the mixer output is introduced in this paper. The proposed calibration technique can be used in multistandard mixers. A CMOS mixer demonstrating the performance for Universal Mobile Telecommunication System application and working with supplies as low as 1 V is designed in a 65-nm technology. The simulation results show that the mixer IIP2 is improved more than 25 dB while the mixer current consumption is increased less than 1 mA. The calibration circuit is low noise not to affect the mixer noise figure.

Keywords

CMOS integrated circuits; mixers (circuits); mobile communication; receivers; CMOS mixer; IIP2 mixer; calibration circuit; direct conversion receivers; programmable nonlinear current; universal mobile telecommunication system; zero-IF receivers; CMOS; Calibration; mixer; second-order input intercept point (IIP2); second-order intermodulation (IM2);

fLanguage

English

Journal_Title

Circuits and Systems II: Express Briefs, IEEE Transactions on

Publisher

ieee

ISSN

1549-7747

Type

jour

DOI

10.1109/TCSII.2008.918998

Filename

4469993