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A Crystal-Less BLE Transmitter With Clock Recovery From GFSK-Modulated BLE Packets
提出一种无晶体BLE发射器，通过GFSK调制包恢复时钟，满足BLE要求。
40nm CMOS
无晶体BLE发射器时钟恢复GFSK调制ADPLL
▸创新点1：无晶体设计 - 该论文提出了一种无需外部晶体的BLE发射机设计，通过直接从GFSK调制的BLE包中恢复时钟信号，显著降低了系统成本和尺寸，同时保持了BLE的通信性能。
▸创新点2：GFSK调制包时钟恢复 - 论文提出了一种新颖的时钟恢复方法，通过GFSK调制信号直接提取时钟信息，解决了传统晶体振荡器的高成本和尺寸问题，提高了系统的集成度和灵活性。
▸创新点3：双全数字锁相环频率合成器 - 该设计采用双全数字锁相环（ADPLL）频率合成器，实现了快速频率校准和系统唤醒，提高了频率稳定性和抗干扰能力，特别适用于密集网络环境。
▸创新点4：嵌入式平均处理单元 - 在ADPLL的环路滤波器中引入了嵌入式平均处理单元，有效提高了从GFSK调制信号中提取频率信息的准确性，进一步增强了系统的鲁棒性和可靠性。
Abstract
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 inf ormation 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.