21:T486,The sub-6GHz spectrum is heavily utilized by $5\mathsf{G}$ New Radio (NR), as well as traditional cellular and $\mathsf{WiFi}$ technologies. A major challenge in designing SAW-less wideband radio receivers (especially targeting the sub-2GHz range) is rejecting interferers at or around the operation frequency and its harmonics that are within the congested sub-6GHz spectrum. Given the stringent linearity requirements of $5\mathsf{G}$ systems, the harmonic rejection should happen early in the receiver (RX) chain to avoid desensitizing the receiver and achieve a high harmonic blocker $1\mathsf{dB}$ compression point $(\mathsf{HB}_{1\mathsf{dB}})$ .22:T45b,This article presents a low-loss fully passive harmonic rejection (HR) and blocker-tolerant mixer-first receiver (RX) for 5G new radio (NR) applications. This design exploits the codesign of charge-sharing and capacitor stacking to offer early HR and high-

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filtering at the antenna interface using only switches and capacitors. A prototype RX in 45-nm partially depleted silicon-on-insulator (PD-SOI) occupies 0.65 mm 2 and operates from 250 MHz to 2.5 GHz while consuming 32.4–54 mW. The proposed design exhibits a noise figure (NF) of 3.5–5.5 dB, an out-of-band (OOB) input-referred third-order intercept point (IIP3) of 13–27 dBm, and an H3/H5-blocker 1-dB compression point (B1dB) of 10/4 dBm. With a −5 dBm third-harmonic blocker, the design experiences less than 1 dB of NF degradation. This notable high degree of harmonic blocker tolerance is achieved by passively rejecting harmonic blockers before they undergo any voltage gain.

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