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A time synchronization circuit with sub-microsecond skew for multi-hop wired wearable networks

机译：具有亚微秒偏斜的时间同步电路，用于多跳有线可穿戴网络

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This paper describes and evaluates a fully digital circuit for one-way master-to-slave, highly precise time synchronization in a low-power wearable system equipped with a set of sensor nodes. These sensors are connected to each other in a mesh topology, with conductive yarns used as one-wire bidirectional communication links. The circuit is designed to perform synchronization in the MAC layer, so that the deterministic part of the clock skew between nodes is kept constant and compensated with a single message exchange. In each sensor node, the synchronization circuit provides a programmable clock signal and a real-time counter for time stamping. Experimental results from a fabricated ASIC (in a CMOS 0.35 mu m technology) show that the circuit keeps the one-hop average clock skew below 4.6 ns and that the skew grows linearly as the hop distance to the reference node increases. The sub-microsecond average clock skew achieved by the proposed solution satisfies the requirements of many wearable sensor network applications. (c) 2015 Elsevier B.V. All rights reserved.
机译：本文描述并评估了在配备有一组传感器节点的低功耗可穿戴系统中用于单向主-从，高精度时间同步的全数字电路。这些传感器以网状拓扑结构相互连接，导电丝用作单线双向通信链路。该电路设计为在MAC层中执行同步，从而使节点之间时钟偏斜的确定部分保持恒定并通过单个消息交换进行补偿。在每个传感器节点中，同步电路都提供一个可编程的时钟信号和一个实时计数器以进行时间戳记。制成的ASIC（采用CMOS 0.35μm技术）的实验结果表明，该电路将单跳平均时钟偏斜保持在4.6 ns以下，并且该偏斜随着到参考节点的跳距的增加而线性增长。所提出的解决方案实现的亚微秒平均时钟偏斜满足了许多可穿戴传感器网络应用的要求。 （c）2015 Elsevier B.V.保留所有权利。

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