A 515 nW, 0-18 dB programmable gain analog-to-digital converter for in-channel neural recording interfaces
|Author||Rodríguez Pérez, Alberto
Delgado Restituto, Manuel
Medeiro Hidalgo, Fernando
|Department||Universidad de Sevilla. Departamento de Electrónica y Electromagnetismo|
|Abstract||This paper presents a low-area low-power Switched-Capacitor (SC)-based Programmable-Gain Analog-to-Digital Converter (PG-ADC) suitable for in-channel neural recording applications. The PG-ADC uses a novel implementation ...
This paper presents a low-area low-power Switched-Capacitor (SC)-based Programmable-Gain Analog-to-Digital Converter (PG-ADC) suitable for in-channel neural recording applications. The PG-ADC uses a novel implementation of the binary search algorithm that is complemented with adaptive biasing techniques for power saving. It has been fabricated in a standard CMOS 130 nm technology and only occupies 0.0326∼mm}2. The PG-ADC has been optimized to operate under two different sampling modes, 27 kS/s and 90 kS/s. The former is tailored for raw data conversion of neural activity, whereas the latter is used for the on-the-fly feature extraction of neural spikes. Experimental results show that, under a voltage supply of 1.2 V, the PG-ADC obtains an ENOB of 7.56 bit (8-bit output) for both sampling modes, regardless of the gain setting. The amplification gain can be programmed from 0 to 18 dB. The power consumption of the PG-ADC at 90 kS/s is 1.52μW with a FoM of 89.49 fJ/conv, whereas at 27 kS/s it consumes 515 nW and obtains a FoM of 98.31 fJ/conv.
|Funding agencies||Ministerio de Economía y Competitividad (MINECO). España
Junta de Andalucía
|Citation||Rodríguez Pérez, A., Delgado Restituto, M. y Medeiro Hidalgo, F. (2014). A 515 nW, 0-18 dB programmable gain analog-to-digital converter for in-channel neural recording interfaces. IEEE Transactions on Biomedical Circuits and Systems, 8, 358-370.|