期刊
IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS
卷 4, 期 6, 页码 360-371出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TBCAS.2010.2078814
关键词
Implantable microelectronic devices; inductive power transmission; neural recording; system-on-a-chip (SoC)
资金
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [0824199] Funding Source: National Science Foundation
- NIBIB NIH HHS [R21 EB009437] Funding Source: Medline
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-mu m standard complementary metal-oxide semiconductor process, measuring 4.9 x 3.3 mm(2) and consuming 5.85 m W 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 mu V-rms in the 1 Hz similar to 10 kHz range when the system is inductively powered with 7-cm separation between aligned coils.
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