用于神经科学应用的感应供电可扩展 32 通道无线神经记录系统级芯片
An Inductively Powered Scalable 32-Channel Wireless Neural Recording System-on-a-Chip for Neuroscience Applications.
出版信息
IEEE Trans Biomed Circuits Syst. 2010 Dec;4(6):360-71. doi: 10.1109/TBCAS.2010.2078814.
We present an inductively powered 32-channel wireless integrated neural recording (WINeR) system-on-a-chip (SoC) to be ultimately used for one or more small freely behaving animals. The inductive powering is intended to relieve the animals from carrying bulky batteries used in other wireless systems, and enables long recording sessions. The WINeR system uses time-division multiplexing along with a novel power scheduling method that reduces the current in unused low-noise amplifiers (LNAs) to cut the total SoC power consumption. In addition, an on-chip high-efficiency active rectifier with optimized coils help improve the overall system power efficiency, which is controlled in a closed loop to supply stable power to the WINeR regardless of the coil displacements. The WINeR SoC has been implemented in a 0.5-μ m standard complementary metal-oxide semiconductor process, measuring 4.9×3.3 mm(2) and consuming 5.85 mW at ±1.5 V when 12 out of 32 LNAs are active at any time by power scheduling. Measured input-referred noise for the entire system, including the receiver located at 1.2 m, is 4.95 μVrms in the 1 Hz~10 kHz range when the system is inductively powered with 7-cm separation between aligned coils.
我们提出了一种基于感应供电的 32 通道无线集成神经记录（WINeR）系统芯片（SoC），最终用于一个或多个自由行为的小动物。感应供电旨在使动物摆脱其他无线系统中使用的大容量电池，从而实现长时间的记录。WINeR 系统采用时分复用以及一种新颖的功率调度方法，可降低未使用的低噪声放大器（LNA）中的电流，从而降低整个 SoC 的功耗。此外，片上高效有源整流器和优化的线圈有助于提高整体系统功率效率，该效率采用闭环控制，可根据线圈的位移为 WINeR 提供稳定的电源。WINeR SoC 已采用 0.5-μm 标准互补金属氧化物半导体工艺实现，尺寸为 4.9×3.3mm(2)，在 ±1.5V 时，当通过功率调度使 12 个 LNA 中的任何一个在任何时候处于活动状态时，其功耗为 5.85mW。当系统在感应功率下以 7cm 的间隔对齐线圈时，整个系统（包括位于 1.2m 处的接收器）的输入参考噪声在 1Hz~10kHz 范围内为 4.95μVrms。
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