Journal
IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS
Volume 5, Issue 2, Pages 112-119Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TBCAS.2011.2141670
Keywords
Biopotential amplifier; digital telemetry; electrocorticogram; electroencephalogram; headmounted systems; local field potentials; micropower instrumentation; neural interface; ultra-wideband telemetry; wireless neural recording
Funding
- DARPA [19GM-1088724]
- NIH [MH062444-065296, 5T32EB003383-07]
- ONR [439471, 396490]
- National Science Foundation [06493449]
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Long-term monitoring of neuronal activity in awake behaving subjects can provide fundamental information about brain dynamics for neuroscience and neuroengineering applications. Here, we present a miniature, lightweight, and low-power recording system for monitoring neural activity in awake behaving animals. The system integrates two custom designed very-large-scale integrated chips, a neural interface module fabricated in 0.5 mu m complementary metal-oxide semiconductor technology and an ultra-wideband transmitter module fabricated in a 0.5 mu m silicon-on-sapphire (SOS) technology. The system amplifies, filters, digitizes, and transmits 16 channels of neural data at a rate of 1 Mb/s. The entire system, which includes the VLSI circuits, a digital interface board, a battery, and a custom housing, is small and lightweight (24 g) and, thus, can be chronically mounted on small animals. The system consumes 4.8 mA and records continuously for up to 40 h powered by a 3.7-V, 200-mAh rechargeable lithium-ion battery. Experimental benchtop characterizations as well as in vivo multichannel neural recordings from awake behaving rats are presented here.
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