Bialek Hayden, Binaie Ali, Ahasan Sohail, Sadagopan Kamala Raghavan, Johnston Matthew L, Krishnaswamy Harish, Natarajan Arun
Oregon State University, Corvallis, OR, 97333 USA.
Columbia University, New York, NY 10032 USA.
IEEE J Solid-State Circuits. 2022 Sep;57(9):2611-2625. doi: 10.1109/jssc.2022.3148088. Epub 2022 Mar 1.
Wake-up receivers (WuRX) present an opportunity to reduce average power consumption of IoT transceivers, however achieving sensitivity and interferer tolerance while providing wideband matching and sharing an antenna interface present a significant challenge for existing architectures. This paper presents a primary/WuRX which utilizes a quadrature hybrid coupler based N-Path mixer first architecture to simultaneously achieve low noise, wideband matching and a shared antenna interface. The passive-mixer first approach and a two-code modulated multi-tone signaling scheme provide interferer tolerance in the WuRX. The paper analyzes gain/power trade-offs in the proposed architecture in the context of noise impact with multi-tone WuRX signaling. The proposed architecture is implemented in 65 nm CMOS and occupies 2.25 . The primary RX achieves 3.8 dB NF and 0.75 dBm out-of-band P1dB with 440W power consumption. The WuRX achieves -86 dBm sensitivity for 10kb/s data rate and up to -40 dB signal-to-interferer ratio (SIR) with 171W power consumption.
唤醒接收器（WuRX）为降低物联网收发器的平均功耗提供了契机，然而，在实现灵敏度和干扰容忍度的同时，还要提供宽带匹配并共享天线接口，这对现有架构而言是一项重大挑战。本文提出了一种主接收器/唤醒接收器，它采用基于正交混合耦合器的N路径混频器优先架构，以同时实现低噪声、宽带匹配和共享天线接口。无源混频器优先方法和双码调制多音信令方案在唤醒接收器中提供干扰容忍度。本文在多音唤醒接收器信令的噪声影响背景下，分析了所提出架构中的增益/功率权衡。所提出的架构在65纳米互补金属氧化物半导体中实现，占用面积为2.25 。主接收器在功耗为440微瓦时，实现了3.8分贝的噪声系数和0.75分贝毫瓦的带外1分贝压缩点功率。唤醒接收器在功耗为171微瓦时，对于10千比特/秒的数据速率实现了-86分贝毫瓦的灵敏度，以及高达-40分贝的信号干扰比（SIR）。
