A low power portable multichannel neural data acquisition system

We present the design and test of a portable multichannel neural data acquisition system. Each analog channel features a low noise (10nV/√Hz), high CMRR (83.4dB) input stage, a 4 order bandpass filter and a selectable gain (60.8dB – 100.8dB). An automatic DC restoration circuit in the input stage rejects the electrodes DC voltage mismatch. The multichannel analog signals are sampled, digitized at 32ksps and transferred through a USB connection. Testing of the device demonstrates its reliability to process neural signals and to be used as a stand-alone recording unit for in-vivo experiments. The implemented printed circuit board consumes up to only 75mW.

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