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

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2 Author(s)
Keehr, E.A. ; California Inst. of Technol., Pasadena, CA, USA ; Hajimiri, A.

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.

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Solid-State Circuits, IEEE Journal of  (Volume:43 ,  Issue: 12 )