Compact, Multi-Channel, Electronic Interface for PNS Recording and Stimulation

Caterina Carboni, Lorenzo Bisoni, Nicola Carta, and Massimo Barbaro

Keywords

Neural Recording, PNS stimulation, Biomedical interfaces, Sigma Delta converters, Low noise neural amplifier

Abstract

A multi-channel system for neural signal recording/stimulation is presented. The system is split on two devices: an implantable High Voltage (HV) CMOS integrated circuit (IC) hosting a sigma delta modulator, together with a low noise preamplifier/prefilter and a digital platform for sigma delta decimation/control implemented on a FPGA. This innovative approach guarantees a robust communication link while minimizing the blocks to be implanted, saving power and area. The recording unit exhibits an IRN = 2.12uVrms in 800Hz-8kHz bandwidth, a programmable gain in the range 45.4dB-58dB and a 14-bit A/D conversion. The IC hosts also a current-mode stimulator able to deliver currents in the range of hundreds of microampere to electrodes with impedances up to 100kΩ.

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