A VCO-based current-to-digital converter for sensor applications

Praveen Prabha, Seong Joong Kim, Karthikeyan Reddy, Sachin Rao, Nathanael Griesert, Arun Rao, Greg Winter, Pavan Kumar Hanumolu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A current sensing VCO based ADC architecture is realized using a passive integrator, VCO-based quantizer, and mostly digital circuits. A digital IIR filter is used instead of an analog loop filter to tackle VCO non-linearity in a power efficient and scaling friendly manner. The prototype circuit designed for an ambient light sensor application achieves 900pA accuracy over an input current range of 4μA, consumes a total of 77.8μA current, and occupies an active area of 0.36mm2 in 0.18μm CMOS process.

Original languageEnglish (US)
Title of host publicationProceedings of the IEEE 2014 Custom Integrated Circuits Conference, CICC 2014
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479932863
DOIs
StatePublished - Nov 4 2014
Event36th Annual Custom Integrated Circuits Conference - The Showcase for Integrated Circuit Design in the Heart of Silicon Valley, CICC 2014 - San Jose, United States
Duration: Sep 15 2014Sep 17 2014

Publication series

NameProceedings of the IEEE 2014 Custom Integrated Circuits Conference, CICC 2014

Other

Other36th Annual Custom Integrated Circuits Conference - The Showcase for Integrated Circuit Design in the Heart of Silicon Valley, CICC 2014
CountryUnited States
CitySan Jose
Period9/15/149/17/14

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Keywords

  • Analog-digital conversion
  • Current measurement
  • Delta-sigma modulation
  • Optical sensors
  • Photodiodes
  • Sensor systems and applications
  • Voltage-controlled oscillators

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Prabha, P., Kim, S. J., Reddy, K., Rao, S., Griesert, N., Rao, A., Winter, G., & Hanumolu, P. K. (2014). A VCO-based current-to-digital converter for sensor applications. In Proceedings of the IEEE 2014 Custom Integrated Circuits Conference, CICC 2014 [6945990] (Proceedings of the IEEE 2014 Custom Integrated Circuits Conference, CICC 2014). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/CICC.2014.6945990