A 1.8mW PLL-Free Channelized 2.4GHz ZigBee Receiver Utilizing Fixed-LO TemperatureCompensated FBAR Resonator

📋 论文概要

该论文提出了一种无锁相环（PLL）的通道化2.4GHz ZigBee接收机，利用温度补偿的FBAR谐振器作为固定本振，实现了1.8mW的超低功耗。通过自偏置共模反馈和改进的LNA电路，解决了低电压下的差分信号失衡问题。

💡 主要创新点

• 采用温度补偿FBAR谐振器替代传统PLL，实现固定本振，大幅降低功耗和面积。
• 提出通道化接收机架构，结合低功耗设计技术（如中等反型偏置），使总功耗仅1.8mW。
• 针对低电压应用，通过自偏置共模反馈和馈通技术改善LNA的增益和相位失衡（改善5.6dB和2.2°）。

🏷 关键词

📄 原文摘要

Avago Technologies, San Jose, CA 1 feed forward the RF signal into M4 and M6 to reduce the differential signal imbalance. Simulated results show that the gain and phase imbalance of the proposed LNA are improved by 5.6dB and 2.2 degrees, respectively. Due to the severe headroom limitation, we bias the low Vt devices (M1-M8) in moderate inversion to optimize the trade-off between their gm/Id and fT. We employ a self-biased common-mode feedback (CMFB) to stabilize the DC level [7]. Ideally, it generates finite common-mode resistance (1/2×gmc) and infinite differential resistance (1/(gmc-gmc)) at the output nodes. 2 This paper presents an ultra-low-power 2.4GHz receiver for the IEEE 802.15.4 (ZigBee) standard. Traditional short-range ISM-band radios require a PLL-based frequency synthesizer for channelization across the band of interest [1-3]. The lowest ZigBee power consumption found in the literature to date is 1.6mW (RX)

👥 作者与机构

Keping Wang1, Jabeom Koo1, Richard Ruby2, Brian Otis1

University of Washington, Seattle, WA,