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A mixer-first receiver enhanced with capacitive positive feedback is proposed to obtain a steeper filter roll-off and enhanced linearity, while keeping low noise figure. It covers all sub-6GHz cellular bands and achieves a high IIP3 of +39dBm and blocker 1dB gain compression point of +12dBm for a blocker frequency-offset of 80MHz at fLO=2GHz. The NF ranges from 2.4dB at fLO=1GHz to 5.4dB at fLO=6GHz...
A software-defined radio receiver that is suitable for intra-band carrier aggregation is demonstrated. The RF front-end frequency selectivity is enhanced by the combination of the passive mixer and a proposed reconfigurable transimpedance amplifier. High order bandpass filtering function with frequency notches can be achieved at the front-end. Current domain complex signal processing is explored to...
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