A Crystal-Less BLE Transmitter With Clock Recovery From GFSK-Modulated BLE Packets
A Crystal-Less BLE Transmitter With Clock Recovery From GFSK-Modulated BLE Packets
复制标题
一种无晶体 BLE 发送器，可从 GFSK 调制的 BLE 数据包恢复时钟
DOI：
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发表时间：
2021
影响因子：
5.4
通讯作者：
D. Wentzloff
中科院分区：
文献类型：
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作者：
Xing Chen;A. Alghaihab;Yao Shi;D. Truesdell;B. Calhoun;D. Wentzloff
在本文中，我们提出了一种无晶体蓝牙低能量(BLE)发射机，该发射机直接从GFSK调制的BLE分组中恢复RF参考。为了从调制信号中实现快速频率校准，并减少来自其他BLE用户的干扰，该收发机由反向通道唤醒接收器、时钟恢复接收器、发送器和用于系统唤醒、时钟恢复、分组传输和频率校准的双数字锁相环(ADPLL)频率合成器组成。为了从GFSK调制信号中提取准确的频率信息，在ADPLL的环路滤波器中嵌入了一个平均处理单元。在此基础上，采用40 nm工艺制作了芯片样机进行验证。具有时钟恢复的无晶体发射器满足SIR的所有BLE要求，使其成为即使在人口稠密的网络中也可以移除晶体的强大解决方案。
In this article, we present a crystal-less Bluetooth low-energy (BLE) transmitter using RF reference recovery directly from GFSK-modulated BLE packets. In order to achieve fast frequency calibration from modulated signals and reduce interference from other BLE users, the transceiver consists of a back-channel wake-up receiver, a clock-recovery receiver, a transmitter, and a dual-all-digital phase-locked loop (ADPLL) frequency synthesizer for system wake-up, clock-recovery, packet transmission, and frequency calibration. An embedded averaging processing unit in the loop filter of the ADPLL is proposed to retrieve accurate frequency information from GFSK-modulated signals. A prototype chip is fabricated in 40-nm CMOS for verification. The crystal-less transmitter with clock recovery meets all BLE requirements for SIR, making this a robust solution for removing the crystal even in densely populated networks.