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A power-efficient narrow-band tunable digital front end (DFE) for bandpass sigma-delta (ΣΔ) analog-to-digital converters is presented. The proposed architecture introduces a new system topology, splitting the down converter into two mixers and placing a cascaded integrator-comb decimation stage between the two mixers. The first mixer is a quadrature mixer that works at a quarter of the sampling frequency...
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