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A sub-1µW, 16kHz Current-Mode SAR-ADC for Neural Spike Recording
Norwegian University of Science and Technology, Faculty of Information Technology, Mathematics and Electrical Engineering, Department of Electronics and Telecommunications.
2011 (English)MasteroppgaveStudent thesis
Abstract [en]

This thesis presents an ultra-low-power 8-bit asynchronous current-mode successive approximation (SAR) ADC for single channel neuron spike recording. The novel design exploits current mode operating in weak inversion for high power efficiency and is designed to operate at a 1.8V supply. The ADC is running at a 16kHz sampling frequency using under 1uW of power, though is adjustable using the featured calibration registers. A finished layout is presented, occupying less than 0.078mm2. Linear operation through mismatch and process variations is obtained using a current calibration circuit connected to both the current mode DAC and all the biases. This ensures INL < 0.5 and DNL < 1, yielding no missing codes and a 3sigma production yield. Calibration is needed because of the relatively large mismatch caused by sub-threshold operation of the current mirrors. The design also offers a newly developed current comparator with high resolution and fast settling relative to the current level and is completable with other state-of-the-art solutions, though still feature some voltage scaling issues left for future work.

Place, publisher, year, edition, pages
Institutt for elektronikk og telekommunikasjon , 2011. , 113 p.
Keyword [no]
ntnudaim:6286, MTEL elektronikk, Analog og blandet design
URN: urn:nbn:no:ntnu:diva-14371Local ID: ntnudaim:6286OAI: diva2:452319
Available from: 2011-10-28 Created: 2011-10-28

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