Journal Article

2.1 GHz MOS mixer linearisation approach for IIP2 enhancement using multiple factor compensation

Holburn, D.M., Jiang, J.

2013

Overview

An integrated downconversion CMOS mixer incorporating a comprehensive compensation scheme is presented which aims to minimise second-order intermodulation distortion (IMD2). Unlike previously reported IMD2 calibration schemes which tune only one nonlinear factor at a time, the presented solution allows simultaneous adjustment of several different factors thus achieving a better compensation. The mixer has been implemented in UMC 0.18 µm CMOS to verify the proposed scheme and for comparison with alternative compensation methods. Measurements show that the solution described can improve the input intercept point (IIP2) by over 20 dB while maintaining good amplification and noise performance. IMD2 calibration results are presented and show useful advantages over other approaches. To the best of the authors' knowledge, this scheme for IMD2 calibration has not been previously reported.

• Publisher: The Institution of Engineering and Technology,Institution of Engineering and Technology
• Subject: Applied sciences / calibration / Circuit properties / Circuits and systems / CMOS integrated circuits / Electric, optical and optoelectronic circuits / Electronic circuits / Electronics / Exact sciences and technology / frequency 2.1 GHz / IIP2 enhancement / IMD2 calibration schemes / integrated down‐conversion CMOS mixer / intermodulation distortion / Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits / MIS devices / MOS mixer linearisation approach / multiple factor compensation / nonlinear factor / second‐order intermodulation distortion calibration schemes / Signal convertors / size 0.18 mum / UHF integrated circuits / UHF mixers / UMC CMOS technology