A 64-Channel 965- <inline-formula> <tex-math notation="LaTeX">$\mu\text{W}$</tex-math> </inline-formula> Neural Recording SoC With UWB Wireless Transmission in 130-nm CMOS
2016; Institute of Electrical and Electronics Engineers; Volume: 63; Issue: 6 Linguagem: Inglês
10.1109/tcsii.2016.2530882
ISSN1558-3791
AutoresStefano Brenna, Fabio Padovan, A. Neviani, Andrea Bevilacqua, Andrea Bonfanti, Andrea L. Lacaita,
Tópico(s)Advanced Memory and Neural Computing
ResumoThis brief presents a 64-channel neural recording system-on-chip (SoC) with a 20-Mb/s wireless telemetry. Each channel of the analog front end consists of a low-noise bandpass amplifier, featuring a noise efficiency factor of 3.11 with an input-referred noise of 5.6 μV rms in a 0.001- to 10-kHz band and a 31.25-kSps 6-fJ/conversion-step 10-bit SAR analog-to-digital converter. The recorded signals are multiplexed in the digital domain and transmitted via an 11.7% efficiency pulse-position modulation ultrawideband transmitter, reaching a transmission range in excess of 7.5 m. The chip has been fabricated in a 130-nm CMOS process, measures 25 mm 2 , and dissipates 965 μW from a 0.5-V supply. This SoC features the lowest power per channel (15 μW) and the lowest energy per bit (48.2 pJ) among state-of-the-art wireless neural recording systems with a number of channels larger than 32. The proposed circuit is able to transmit the raw neural signal in a large bandwidth (up to 10 kHz) without performing any data compression or losing vital information, such as local field potentials.
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