Abstract
This letter introduces the use of <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">class-</i> F adiabatic <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">switching</i> in a mixer-first 2.45-GHz ISM-band receiver. By using the principle of adiabatic switching with a class-F VCO, a resonant multiharmonic drive for an N-path-based mixer-first receiver is generated, resulting in a reduced power consumption while maintaining a good mixer noise figure (NF). To optimize the area, coupled inductors in the VCO are used. By employing a switched capacitor (SC) feedback network in the baseband (BB) amplifier, a proper input matching and flexible common-mode (CM) bias is achieved. A packaged chip implemented in 28-nm CMOS achieves a low-power consumption of 3.5 mW with a gain of 22 dB and an NF of 7.4 dB.
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