A Blocker-Resilient Receiver With Second-Order Impedance Mapping For Nb-Iot Applications
IEICE ELECTRONICS EXPRESS(2020)
摘要
Wideband receiver used in IoT applications operating at subGHz suffers from strong interferes. This paper presents a blocker-resilient wideband receiver architecture for NB-IoT applications. By exploiting the impedance mapping characteristic of N-Path filter and a low noise amplifier with negative feedback, a high-order filtering characteristics of baseband is mapped to RF input so as to implement wideband impedance matching and blocker suppression. To further improve the out-of-band linearity, a dual mixer structure is employed to cancel the out-of-band blockers before the TIA. Measurements show the RX out-of-band IIP3 is +17.6 dBm, while in-band IIP3 is -13 dBm.
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关键词
receiver, Internet of things, blocker-resilient, blocker-cancelling, low power
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