An Inductively Powered Scalable 32-Channel Wireless Neural Recording System-on-a-Chip for Neuroscience Applications.
An Inductively Powered Scalable 32-Channel Wireless Neural Recording System-on-a-Chip for Neuroscience Applications.
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DOI：
10.1109/isscc.2010.5434028
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
Ghovanloo M
中科院分区：
文献类型：
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作者：
Lee SB;Lee HM;Kiani M;Jow UM;Ghovanloo M
我们提出了一种感应供电的32通道无线集成神经记录(Winer)片上系统(SoC)，最终用于一个或多个小型自由行为动物。感应供电的目的是让动物不必携带用于其他无线系统的笨重电池，并允许进行长时间的录音。Winer系统使用时分多路复用以及一种新颖的功率调度方法，该方法可以减少未使用的低噪声放大器(LNA)中的电流，以降低SoC的总功耗。此外，带有优化线圈的片上高效有源整流器有助于提高整个系统的功率效率，该功率效率在闭环中进行控制，以向卷取机提供稳定的功率，而不考虑线圈的位移。Winer SoC已在0.5-μm标准互补金属氧化物半导体工艺中实现，通过功率调度，当32个LNA中的12个处于活动状态时，功耗为5.85 mW(±1.5V)。整个系统(包括位于1.2m处的接收器)的测量输入参考噪声在1 Hz~10μ范围内为4.95 Vrmz，当系统感应供电时，对齐线圈之间的间隔为7 cm。
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 mm2and 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 μVrmsin the 1 Hz~10 kHz range when the system is inductively powered with 7-cm separation between aligned coils.