A Successiveapproximation Adc For Cmos Image Sensors

• doi: 10.1109/ICMCS.2011.5945569
• title: A successive-approximation ADC for CMOS image sensors
• publisher: IEEE
• isbn: 978-1-61284-731-3
• issn:
• partnum: 11TH9195
• rank: 1309
• access_type: LOCKED
• content_type: Conferences
• abstract: The CMOS image sensors are achieving a growing presence in today's mobile applications as the industry acknowledges the advances of the CMOS-based technology and its scaling possibilities. The roadmap recently unveiled for CMOS Image Sensor is announcing ever smaller pixels, after 1.4μm pixel pitch, demos with a pitch of 1.1μm were presented, and it also announces the future generation of pixels with 0.9μm pixel size. This steady decrease in pixel size has had a profound impact on sensors analog readout electronics, and, in particular, on their ADC architecture. For mobile applications, the ADCs are mostly placed in each column of image arrays, as the width of each converter need to fit in the image array pitch. The design becomes a true challenge as the available area for layout is very critical. To overcome this limitation, a compromise between column level and chip level ADCs can be used. A solution using a converter per 32 columns of the pixel array is proposed. The converter is a Successive Approximation (SA) ADC of apparent resolution 12 bits and is obtained from a 9 bits converter. This work presents a conversion architecture, particularly well adapted to image sensors where the noise level varies along with the amplitude of the useful signal. The proposed design presents the benefit of increasing the number of bits of the ADC without excessively increasing its complexity or its processing time. The converter is designed in CMOS 65nm technology, and will be implemented in a 5Megapixel sensor, at a sampling rate of 8.33MS/s. The simulations show good linearity and verify the concept of the new architecture.
• article_number: 5945569
• pdf_url: https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5945569
• html_url: https://ieeexplore.ieee.org/document/5945569/
• abstract_url: https://ieeexplore.ieee.org/document/5945569/
• publication_title: 2011 International Conference on Multimedia Computing and Systems
• conference_location: Ouarzazate, Morocco
• conference_dates: 7-9 April 2011
• publication_number: 5931355
• is_number: 5945564
• publication_year: 2011
• publication_date: 7-9 April 2011
• start_page: 1
• end_page: 6
• citing_paper_count: 5
• citing_patent_count: 1
• download_count: 1879
• insert_date: 20110711
• index_terms:
  • ieee_terms:
    • Noise
    • Pixel
    • Sensors
    • CMOS image sensors
    • Capacitors
    • Image resolution
    • Approximation methods
  • author_terms:
    • A/D conversion
    • CMOS Image Sensors
    • column-level ADC
    • Successive Approximations ADC
    • Differential Charge Redistribution DAC
    • Fringe capacitor
  • dynamic_index_terms:
    • Image Sensor
    • Camera Sensor
    • Signal Amplitude
    • Array Images
    • Array Tomography
    • Successive Approximation
    • Pixel Pitch
    • Digital Camera
    • Image Quality
    • Time Constraints
    • Power Consumption
    • Input Signal
    • Analog Signal
    • Parallel Signaling
    • Shot Noise
    • Poisson Noise
    • Output Stage
    • Least Significant Bit
    • Low Bit
    • Most Significant Bit
    • High Bit
    • Highest Bit
    • Mobile Camera
    • Mobile Phone Camera
    • Cell Phone Camera
    • Capacitor Size
• isbn_formats:
  • format: CD, value: 978-1-61284-731-3, isbnType: New-2005
  • format: Print ISBN, value: 978-1-61284-730-6, isbnType: New-2005
  • format: Electronic ISBN, value: 978-1-61284-732-0, isbnType: New-2005
• authors:
  • Author Name: Malika Alami Marktani
    Affiliation: IMAGING Division, STMicroelectronics, Rabat, Morocco
    Author URL: https://ieeexplore.ieee.org/author/37713787700
    ID: 37713787700
    Order: 1
    Author Affiliations:
    • IMAGING Division, STMicroelectronics, Rabat, Morocco
    • Faculty of sciences and technology, Sidi Mohamed Ben Abdellah University, Fes, Morocco
  • Author Name: Stephane Vivien
    Affiliation: IMAGING Division, STMicroelectronics, Grenoble, France
    Author URL: https://ieeexplore.ieee.org/author/37713788500
    ID: 37713788500
    Order: 2
    Author Affiliations:
    • IMAGING Division, STMicroelectronics, Grenoble, France
  • Author Name: Laurent Simony
    Affiliation: IMAGING Division, STMicroelectronics, Grenoble, France
    Author URL: https://ieeexplore.ieee.org/author/37713788400
    ID: 37713788400
    Order: 3
    Author Affiliations:
    • IMAGING Division, STMicroelectronics, Grenoble, France
  • Author Name: Ali Ahaitouf
    Affiliation: Faculty of sciences and technology, Sidi Mohamed Ben Abdellah University, Fes, Morocco
    Author URL: https://ieeexplore.ieee.org/author/37719246800
    ID: 37719246800
    Order: 4
    Author Affiliations:
    • Faculty of sciences and technology, Sidi Mohamed Ben Abdellah University, Fes, Morocco
  • Author Name: Abdelaziz Ahaitouf
    Affiliation: Polydisciplinary Faculty, LIMAO Laboratory, Taza, Morocco
    Author URL: https://ieeexplore.ieee.org/author/37719246900
    ID: 37719246900
    Order: 5
    Author Affiliations:
    • Polydisciplinary Faculty, LIMAO Laboratory, Taza, Morocco

Image Sensor

• sensor_type: CMOS
• resolution: 5 Megapixels (2624x1968)
• dynamic_range: Not specified
• pixel_size: 1.4µm (and future developments down to 0.9µm)
• dark_current: Not specified

Optical Data

• focal_length: Not specified
• aperture: Not specified
• field_of_view: Not specified
• distortion: Not specified

Performance Metrics

• frame_rate: 30 frames/s
• power_consumption: 1.3548 mW
• noise: Read noise and shot noise, specifics not provided

Applications & Benefits

• cell_imaging: Mobile applications such as digital still cameras and smartphone cameras.
• benefits: Improvement in noise performance and image quality, compact design suitable for mobile applications.

Supporting Organizations

• supported_by: STMicroelectronics, CNRST Rabat

Manuscript Details

• publication_date: 7-9 April 2011

Relevancy Score

• score: 10
• missing_fields:
  • fill factor
  • quantum efficiency
  • readout speed
  • temporal noise
  • fixed-pattern noise
  • microlenses
  • on-chip colour filters
  • global or rolling shutters
  • backside illumination

Processed JSON Filename

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