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Recent advances in software-defined radio (SDR) technology have been pushing mixed-signal circuits to higher frequencies and forcing system integration in a single chip. These new mixed-signal devices have the capability to replace part of what was hitherto the analog side of the radio circuit, and simultaneously add several advantages. This imposes on radio engineers the need to understand and cope...
A 0.1–0.7GHz switched-capacitor RF front end features tunable center frequency and programmable filter order as well as very high tolerance for out-of-band (OB) blockers. RF input impedance matching, N-path filtering, down-conversion, and high order IIR filtering are implemented using highly linear switches and capacitors only. The 3.24mm2 40nm CMOS front-end prototype consumes 38.5–76.5mA, achieves...
A reconfigurable software-defined radio receiver supporting dual-band carrier aggregation is demonstrated in a 65nm LP CMOS technology. A front-end filter, leveraging both the input impedance and voltage transfer functions of an N-path filter, can be configured either as a parallel bandpass or a series notch filter. The dual-band carrier aggregation is achieved by combing a conventional N-path filter...
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