A 10-b 330nW Third-Order Predictive SAR ADC Dedicated to Neural Recording Brain Implants

Mohsen Namavar, Reza Lotfi, Amir M. Sodagar

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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This paper reports on a predictive analog-todigital converter (ADC). The proposed ADC employs a linear predictive filter to prepare a prediction for the current sample based on the values of the previous digital codes. This leads to significant reduction in the mean bit cycle of the converter. It is shown in this work that this idea is significantly more effective for the digitization of biological signals (e.g., intra-cortical neural signals). Compared with other similar techniques available in the literature, the proposed predictive ADC is significantly more successful for small signal-to-noise ratios. The proposed algorithm results in 48% and 37% reduction in the converter’s mean bit cycle compared with the conventional and LSB-first structures, respectively. Designed and post-layout simulated in a 90-nm standard CMOS technology and operated at 200 kS/s with a supply voltage of 0.4 V, the 10-bit predictive ADC consumes 330 nW. The circuit occupies a core area of 0.025 mm2, achieves an ENOB of 9.42 bits, a figure-of-merit of 2.4 fJ/conv.-step, and an SFDR of 65.8 dB. The DNL and INL of the circuit are within 0.45 LSB and 0.56 LSB, respectively.
Original languageEnglish
Title of host publicationProceedings of the 2022 20th IEEE Interregional NEWCAS Conference (NEWCAS)
Number of pages5
ISBN (Electronic)978-1-6654-0105-0
ISBN (Print)978-1-6654-0106-7
Publication statusPublished - 2022
Event2022 20th IEEE Interregional NEWCAS Conference (NEWCAS) - Quebec City, Canada
Duration: 19 Jun 202222 Jun 2022
Conference number: 20th


Conference2022 20th IEEE Interregional NEWCAS Conference (NEWCAS)
CityQuebec City

Bibliographical note

Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.


  • neural-specific ADC
  • predictive ADC
  • linear predictive filter


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