An Always-on 4× Compressive VGA CMOS Imager with 51pJ/Pixel and >32dB PSNR

Wenda Zhao, Chanmin Park, Injun Park, Nan Sun, Youngcheol Chae

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

Abstract

This paper presents a 4× compressive CMOS imager for always-on operation that achieves an energy efficiency of 51pJ/pixel, while maintaining high image quality of PSNR>32dB and SSIM>0.84. This is enabled by an energy-efficient compressive-sensing (CS) encoder, which replaces a densely populated CS encoding method with a highly sparse pseudo-diagonal one. Since the proposed CS encoder can be implemented with an energy-efficient switched-capacitor matrix multiplier at pixel outputs, data compression is achieved prior to pixel digitization, thereby greatly reducing ADC power, data size, and I/O power. The energy efficiency of the imager is further improved by incorporating it into dynamic single-slope ADCs. A prototype VGA imager consumes only 0.7mW at 45 fps. The corresponding energy per pixel (51pJ/pixel) amounts to a 20× improvement over the previous low-energy benchmark on CS imagers.

Original languageEnglish
Title of host publication2020 IEEE Symposium on VLSI Circuits, VLSI Circuits 2020 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728199429
DOIs
Publication statusPublished - 2020 Jun
Event2020 IEEE Symposium on VLSI Circuits, VLSI Circuits 2020 - Honolulu, United States
Duration: 2020 Jun 162020 Jun 19

Publication series

NameIEEE Symposium on VLSI Circuits, Digest of Technical Papers
Volume2020-June

Conference

Conference2020 IEEE Symposium on VLSI Circuits, VLSI Circuits 2020
CountryUnited States
CityHonolulu
Period20/6/1620/6/19

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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