26.6 A programmable receiver front-end achieving >17dBm IIP3 at <1.25×BW frequency offset

Recent work on highly selective reconfigurable radios has focused on techniques such as DT analog signal processing [1], N-path filtering [2], and mixer-first approaches [3,4]. Mixer-first receivers have been able to achieve excellent out-of-band (OOB) linearity even with noise cancellation [3], but only for far-out blockers due to only first-order baseband filtering. Higher-order baseband filters give sharper filtering, but are not as linear [4], while high-order active N-path filters have poor S11 [2]. DT approaches are also limited by the linearity of the front-end LNTA [1]. Hence, new approaches are needed to handle large blockers that are close to the signal band.