WO2023238068A3 - Imager pixel - Google Patents

Imager pixel Download PDF

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Publication number
WO2023238068A3
WO2023238068A3 PCT/IB2023/055896 IB2023055896W WO2023238068A3 WO 2023238068 A3 WO2023238068 A3 WO 2023238068A3 IB 2023055896 W IB2023055896 W IB 2023055896W WO 2023238068 A3 WO2023238068 A3 WO 2023238068A3
Authority
WO
WIPO (PCT)
Prior art keywords
current
pulse width
readout
cntb
cnta
Prior art date
Application number
PCT/IB2023/055896
Other languages
French (fr)
Other versions
WO2023238068A2 (en
Inventor
Karim Ali AHMED
Longyang LIN
Praveenakumar Shivappa SALAMANI
Massimo Alioto
Original Assignee
National University Of Singapore
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by National University Of Singapore filed Critical National University Of Singapore
Publication of WO2023238068A2 publication Critical patent/WO2023238068A2/en
Publication of WO2023238068A3 publication Critical patent/WO2023238068A3/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
    • H04N25/70—SSIS architectures; Circuits associated therewith
    • H04N25/76—Addressed sensors, e.g. MOS or CMOS sensors
    • H04N25/77—Pixel circuitry, e.g. memories, A/D converters, pixel amplifiers, shared circuits or shared components
    • H04N25/772—Pixel circuitry, e.g. memories, A/D converters, pixel amplifiers, shared circuits or shared components comprising A/D, V/T, V/F, I/T or I/F converters

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)

Abstract

An imager pixel comprising a forward-biased photo-detector with readout transistor for light-to-current conversion, and a ratiometric readout system comprising a current to pulse width converter. The readout system operates in a light mode to: generate a first current proportional to a photodetector current and a leakage current, on exposure to a photodetector voltage; and convert the first current to a first pulse width; and operates in a least significant bit (LSB) mode to: generate a second current proportional to a least significant bit (LSB) current and the leakage current, on exposure to a gate-source voltage; and convert the second current to a second pulse width. The system includes a converter circuit for converting the first pulse width to a count (CNTB) and the second pulse width to a count (CNTA), and a counting circuit for providing a radiometric readout based on a ratio of CNTB to CNTA.
PCT/IB2023/055896 2022-06-07 2023-06-07 Imager pixel WO2023238068A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SG10202250078Y 2022-06-07
SG10202250078Y 2022-06-07

Publications (2)

Publication Number Publication Date
WO2023238068A2 WO2023238068A2 (en) 2023-12-14
WO2023238068A3 true WO2023238068A3 (en) 2024-02-29

Family

ID=89117872

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2023/055896 WO2023238068A2 (en) 2022-06-07 2023-06-07 Imager pixel

Country Status (1)

Country Link
WO (1) WO2023238068A2 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170041517A1 (en) * 2015-08-03 2017-02-09 Semiconductor Energy Laboratory Co., Ltd. Imaging device and electronic device
CN111770245A (en) * 2020-07-29 2020-10-13 中国科学院长春光学精密机械与物理研究所 Pixel structure of retina-like image sensor
US20210258531A1 (en) * 2018-09-28 2021-08-19 The Board Of Trustees Of The University Of Illinois Polarization Imager with High Dynamic Range

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170041517A1 (en) * 2015-08-03 2017-02-09 Semiconductor Energy Laboratory Co., Ltd. Imaging device and electronic device
US20210258531A1 (en) * 2018-09-28 2021-08-19 The Board Of Trustees Of The University Of Illinois Polarization Imager with High Dynamic Range
CN111770245A (en) * 2020-07-29 2020-10-13 中国科学院长春光学精密机械与物理研究所 Pixel structure of retina-like image sensor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
A HMED, K.A. ET AL.: "Imager with Dynamic LSB Adaptation and Ratiometric Readout for Low-Bit Depth 5-pW Peak Power in Purely-Harvested Systems", 2022 IEEE SYMPOSIUM ON VLSI TECHNOLOGY AND CIRCUITS, 17 June 2022 (2022-06-17), pages 50 - 51, XP034154109, [retrieved on 20240109], DOI: 10.1109/VLSITECHNOLOGYANDCIR46769.2022.9830147 *

Also Published As

Publication number Publication date
WO2023238068A2 (en) 2023-12-14

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