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A Novel Modeling and Performance Analysis of Imperfect Quadrature Modulator in RF Transmitter
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 Title & Authors
A Novel Modeling and Performance Analysis of Imperfect Quadrature Modulator in RF Transmitter
Park, Yong-Kuk; Kim, Hyeong-Seok; Lee, Ki-Sik;
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In a wireless communication RF transmitter, the output of a quadrature modulator (QM) is distorted by not only the linear imperfection features such as in/quadrature-phase (I/Q) input gain imbalance, local phase imbalance, and local gain imbalance but also the nonlinear imperfection features such as direct current (DC) offset and mixer nonlinearity related to in-band spurious signal. In this paper, we propose the unified QM model to analyze the combined effects of the linear and nonlinear imperfection features on the performance of the QM. The unified QM model consists of two identical nonlinear systems and modified I/Q inputs based on the two-port nonlinear mixer model. The unified QM model shows that the output signals can be expressed by mixer circuit parameters such as intercept point and gain as well as the imperfection features. The proposed approach is validated by not only simulation but also measurement.
Imperfection features;Combined effect;Unified QM model;Modified I/Q inputs;
 Cited by
I/Q Compensation of Broadband Direct-Conversion Transmitters, IEEE Transactions on Wireless Communications, 2014, 13, 6, 3329  crossref(new windwow)
Y.-J. Ko and S. Stapleton, "Gain and phase mismatch effects on double image rejection transmitter," IET. Circuits, Devices & Systems, vol. 5, issue. 3, pp. 212- 221, May 2011. crossref(new window)

A. Georgiadis, "Gain, phase imbalance, and phase noise effects on error vector magnitude," IEEE Trans. Veh. Technol., vol. 53, issue. 2, pp. 443-449, Mar. 2004. crossref(new window)

A. Yamaoka, K. Yamaguchi, T. Kato, and Y. Tanabe, "Experimental performance evaluation of IQ imbalance and DC offset estimation and compensation technique for 3GPP LTE base station," IEEE MTT-S., pp. 268-271, May 2010.

S. E. Gunnarsson, D. Kuylenstierna, and H. Zirath, "Analysis and design of millimeter-wave FET-based image reject mixers," IEEE Trans. Microwave Theory Tech., vol. 55, issue. 10, pp. 2065-2074, Oct. 2007. crossref(new window)

T. H. Lee, The Design of CMOS Radio-frequency Integrated Circuits, Cambridge University Press, Cambridge, 2004.

E. E. Bautista, B. Bastani, and J. Heck, "A high IIP2 downconversion mixer using dynamic matching," IEEE J. Solid-State Circuits, vol. 35, issue. 12, pp. 1934-1941, Dec. 2000. crossref(new window)

G. D. Vendelin, A. M. Pavio, and U. L. Rohde, Microwave Circuit Design using Linear and Nonlinear Technique, Wiley, New York, 2005.