A Dualexposure Inpixel Charge Subtraction Ctia Cmos Image Sensor For Centroid Measurement In Star Trackers

• doi: 10.1109/APCCAS.2014.7032820
• title: A dual-exposure in-pixel charge subtraction CTIA CMOS image sensor for centroid measurement in star trackers
• publisher: IEEE
• isbn: 978-1-4799-5230-4
• issn:
• rank: 1051
• access_type: LOCKED
• content_type: Conferences
• abstract: In this work, we present a CMOS image sensor for star centroid measurement in star trackers. The analysis of the star tracker system shows that long integration will cause "tail effect" in the star image. It significantly reduces the signal magnitude, which in turn increases the centroiding errors. In order to capture limited photons generated from dim stars within shortened integration time, we propose a new capacitive transimpedance amplifier (CTIA) pixel architecture with a small integration capacitor. On the other hand, bright stars can easily saturate the pixels, which can also induce significant measurement errors. To avoid pixel saturation, the pixel is able to perform in-pixel charge subtraction based on photocurrent thresholding. In order to validate the pixel design, we have fabricated a test chip consisting of a 4×4 pixel array using Global Foundry 65 nm mixed signal CMOS process.
• article_number: 7032820
• pdf_url: https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=7032820
• html_url: https://ieeexplore.ieee.org/document/7032820/
• abstract_url: https://ieeexplore.ieee.org/document/7032820/
• publication_title: 2014 IEEE Asia Pacific Conference on Circuits and Systems (APCCAS)
• conference_location: Ishigaki, Japan
• conference_dates: 17-20 Nov. 2014
• publication_number: 7021138
• is_number: 7032694
• publication_year: 2014
• publication_date: 17-20 Nov. 2014
• start_page: 467
• end_page: 470
• citing_paper_count: 2
• citing_patent_count: 0
• download_count: 474
• insert_date: 20150209
• index_terms:
  • ieee_terms:
    • Photoconductivity
    • Accuracy
    • Dynamic range
    • Sensors
    • CMOS image sensors
    • Sensitivity
    • Arrays
  • dynamic_index_terms:
    • Image Sensor
    • Camera Sensor
    • Star Tracker
    • Centroid Measurement
    • Integration Time
    • Photocurrent
    • Mixed Signals
    • Saturated Pixels
    • Tail Events
    • Tail Effect
    • Exposure Time
    • Dynamic Range
    • Focal Plane
    • Back Focal Plane
    • Quantum Efficiency
    • Point Source
    • Point Spread Function
    • Angular Speed
    • Angular Rate
    • High Dynamic Range
    • Low Earth Orbit
    • Low Earth Orbit Satellite
    • Ms Integration Time
    • Μs Integration Time
    • Consecutive Exposures
• isbn_formats:
  • format: Electronic ISBN, value: 978-1-4799-5230-4, isbnType: New-2005
• authors:
  • Author Name: Xinyuan Qian
    Affiliation: Satellite Research Center
    Author URL: https://ieeexplore.ieee.org/author/38236457300
    ID: 38236457300
    Order: 1
    Author Affiliations:
    • Satellite Research Center
  • Author Name: Menghan Guo
    Affiliation: Satellite Research Center
    Author URL: https://ieeexplore.ieee.org/author/37085361629
    ID: 37085361629
    Order: 2
    Author Affiliations:
    • Satellite Research Center
  • Author Name: Hang Yu
    Affiliation: Satellite Research Center
    Author URL: https://ieeexplore.ieee.org/author/37089736693
    ID: 37089736693
    Order: 3
    Author Affiliations:
    • Satellite Research Center
  • Author Name: Shoushun Chen
    Affiliation: VIRTUS IC Design Center of Excellence, Nanyang Technological University, Singapore
    Author URL: https://ieeexplore.ieee.org/author/37535877300
    ID: 37535877300
    Order: 4
    Author Affiliations:
    • VIRTUS IC Design Center of Excellence, Nanyang Technological University, Singapore
  • Author Name: Kay Soon Low
    Affiliation: Satellite Research Center
    Author URL: https://ieeexplore.ieee.org/author/37378921400
    ID: 37378921400
    Order: 5
    Author Affiliations:
    • Satellite Research Center

Image Sensor

• sensor_type: CMOS
• resolution: 4x4 pixels
• dynamic_range: 62 dB (74 dB with charge subtraction)
• pixel_size: 22×22 μm2
• dark_current: 48 fA

Optical Data

• focal_length: 3 cm
• aperture: Not specified
• field_of_view: 20 degrees
• distortion: Not specified

Performance Metrics

• sensitivity: 3.8 V/lux·s
• noise: Temporal noise of 980 μV (6 1 e-)

Applications & Benefits

• cell_imaging: Used for star centroid measurement in star trackers.
• benefits: Allows for high sensitivity and dynamic range suitable for capturing both bright and dim stars in astrophotography.

Supporting Organizations

• supported_by: Supported by ACRF Project (M4020153.040)

Manuscript Details

• publication_date: 17-20 Nov. 2014

Relevancy Score

• score: 10
• missing_fields:
  • quantum efficiency
  • readout speed
  • fixed-pattern noise
  • analog-to-digital conversion techniques
  • on-chip colour filters
  • global or rolling shutters
  • backside illumination

Processed JSON Filename

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