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Digital Adaptive IIP2 Calibration Scheme for CMOS Downconversion Mixers

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3 Author(s)
Dufrene, K. ; Inst. for Electron. Eng., Univ. Erlangen-Nuremberg, Erlangen ; Boos, Z. ; Weigel, R.

This paper presents a cancellation scheme of second order intermodulation distortion based on adaptive digital calibration of the RF downconversion mixer. The system utilizes a low-complexity LMS-based equalizer, which correlates differential mode distortion with common mode distortion to estimate optimum settings of the analog IP2 calibration circuit. A tunable IQ mixer prototype, fabricated in a 0.13 mum RF CMOS technology and operating under low voltage supply of 1.5 V, is presented. Experimental results confirm the feasibility of the proposed IP2 calibration method.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:43 ,  Issue: 11 )

Date of Publication:

Nov. 2008

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