Caterina Carboni, Lorenzo Bisoni, Nicola Carta and Massimo Barbaro
Neural recording, PNS stimulation, Biomedical interfaces,Sigma delta converters, Low noise neural amplifier.
A multi-channel system for neural signal record- ing/stimulation is presented. The system is split on two devices: an implantable High Voltage (HV) CMOS integrated circuit (IC) hosting a sigma delta modulator, to- gether 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 im- planted, saving power and area. The recording unit exhibits an IRN = 2.12µVrms 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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