Journal
IEEE SOLID-STATE CIRCUITS LETTERS
Volume 3, Issue -, Pages 486-489Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LSSC.2020.3029016
Keywords
Low-noise amplifier (LNA); noise efficiency factor (NEF); power efficiency factor (PEF); series-parallel amplifier (SPA); switched capacitor
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This letter proposes a discrete-time low-noise amplifier (LNA) achieving a 0.45 noise efficiency factor (NEF) and 0.2 power efficiency factor (PEF), the lowest reported values to date. We demonstrate a switched-capacitor (SC)-based series-parallel amplifier (SPA) used as a noise-efficient LNA, relaxing the noise requirements of the following chain and reducing the power consumption of the analog frontend. A successive-approximation amplifier (SAA) serves as a second variable-gain stage. The proposed LNA achieves 1.2-mu VRMS inputreferred noise by oversampling the input signal while consuming 680 nW, including all the contributions from the clock-distribution network and gate drivers. The CMRR and PSRR are 97.1 dB and 78.6 dB, respectively, and the THD is -71 dB at 20-mVPP input.
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