A Low Power 0.4-1 Ghz Receiver Front-End with an Enhanced Third-Order-Harmonic-Rejecting Series N-Path Filter

In this paper, a low power 0.4-1 GHz receiver front-end (RX-FE) with an enhanced third-order-harmonic-rejecting series N-path filter (3rd-HRSNPF) is proposed. The 3rd-HRSNPF provides sufficient third order harmonic rejection (HR3) to eliminate the harmonic rejection mixer (HRM). The receiver front-end has been implemented in a 40 nm CMOS technology. Simulation results show that it achieves a HR3 of 53 dB without HRM in case of 6% duty-cycle error and 0.5° phase error. Operating from 0.4–1 GHz, its power consumption and double-sideband noise figure (DSB NF) are only 8.2–9.9 mW and 3.0–3.2 dB, respectively.