Equalization of Third-Order Intermodulation Products in Wideband Direct Conversion Receivers

Creators: Keehr, Edward A.; Hajimiri, Ali

Abstract

This paper reports a SAW-less direct-conversion receiver which utilizes a mixed-signal feedforward path to regenerate and adaptively cancel IM3 products, thus accomplishing system-level linearization. The receiver system performance is dominated by a custom integrated RF front end implemented in 130-nm CMOS and achieves an uncorrected out-of-band IIP3 of -7.1 dBm under the worst-case UMTS FDD Region 1 blocking specifications. Under IM3 equalization, the receiver achieves an effective IIP3 of +5.3 dBm and meets the UMTS BER sensitivity requirement with 3.7 dB of margin.

Additional Information

© Copyright 2008 IEEE. Reprinted with permission. Manuscript received April 07, 2008; revised August 06, 2008. Current version published December 10, 2008. This work was supported in part by an NDSEG Fellowship and by the Lee Center for Advanced Networking. The authors would like to thank F. Bohn for the frequency divider IP and testing assistance from H. Mani and J. Yoo, all of Caltech. They would also like to thank Prof. A. Emami, Prof. B. Hassibi, Prof. V. Pedroni, H. Wang, Y. Wang, F. Bohn, S. Jeon, A. Babakhani, J. Chen, and M. Loh of Caltech, and S. Kousai of Toshiba for their help and advice.

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