A Pwm Dps With Pixellevel Reconfigurable 48Bit Countersram

• doi: 10.1109/ISCAS.2005.1464947
• title: A PWM DPS with pixel-level reconfigurable 4/8-bit counter/SRAM
• publisher: IEEE
• isbn: 0-7803-8834-8
• issn: 2158-1525
• partnum: 05CH37618
• rank: 878
• access_type: LOCKED
• content_type: Conferences
• abstract: A pulse width modulation (PWM) digital pixel sensor (DPS) is presented. The pixel includes a novel pixel-level reconfigurable 4/8-bit counter/SRAM, which can operate as a 4-bit counter or as an 8-bit memory. In contrast to the conventional PWM DPS in which all the encoding data are provided by a global counter, in our DPS, for the 8-bit digital data encoding the photodiode current, 4 bits are obtained from this pixel-level counter and the other 4 bits are provided by a global counter. The number of global data buses is thus reduced which in turn reduces the global bus capacitance and eases the routing. Moreover, the pixel can operate in 8-bit or in 4-bit conversion mode. 8-bit conversion provides a normal high resolution imaging while 4-bit conversion provides a higher frame rate. The pixel sensor has been designed and fabricated in a 0.35 /spl mu/m CMOS technology and its operation is demonstrated through experimental results. Each pixel occupies an area of 46/spl times/48 /spl mu/m/sup 2/ with a fill-factor of 14%.
• article_number: 1464947
• pdf_url: https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1464947
• html_url: https://ieeexplore.ieee.org/document/1464947/
• abstract_url: https://ieeexplore.ieee.org/document/1464947/
• publication_title: 2005 IEEE International Symposium on Circuits and Systems (ISCAS)
• conference_location: Kobe, Japan
• conference_dates: 23-26 May 2005
• publication_number: 9898
• is_number: 31469
• publication_year: 2005
• publication_date: 23-26 May 2005
• start_page: 1754
• end_page: 1757 Vol. 2
• citing_paper_count: 3
• citing_patent_count: 0
• download_count: 246
• insert_date: 20050725
• index_terms:
  • ieee_terms:
    • Pulse width modulation
    • Counting circuits
    • Random access memory
    • Encoding
    • CMOS technology
    • Space vector pulse width modulation
    • Digital modulation
    • Photodiodes
    • Data buses
    • Capacitance
  • dynamic_index_terms:
    • Pulse Width
    • Pulsewidth Modulation
    • Frame Rate
    • High Frame Rate
    • CMOS Technology
    • Mode Conversion
    • Digital Sensor
    • Sensor Pixel
    • Data Bus
    • Power Consumption
    • Memory Cells
    • Photocurrent
    • Time Of Discharge
    • Image Sensor
    • Camera Sensor
    • Motion Detection
    • Motion Sensors
    • Comparable Yields
    • Comparator Output
    • Comparison Of Yield
    • Comparison Of Outputs
    • Amount Of Charge
    • Charge Quantity
    • Active Switches
    • Conversion Time
    • Low Illumination
    • Switching Noise
• isbn_formats:
  • format: Print ISBN, value: 0-7803-8834-8, isbnType: Historical
• authors:
  • Author Name: Yat-Fong Yung
    Affiliation: Electrical and Electronic Engineering Department, Hong Kong University of Science and Technology, Kowloon, Hong Kong, China
    Author URL: https://ieeexplore.ieee.org/author/37087512095
    ID: 37087512095
    Order: 1
    Author Affiliations:
    • Electrical and Electronic Engineering Department, Hong Kong University of Science and Technology, Kowloon, Hong Kong, China
  • Author Name: A. Bermak
    Affiliation: Electrical and Electronic Engineering Department, Hong Kong University of Science and Technology, Kowloon, Hong Kong, China
    Author URL: https://ieeexplore.ieee.org/author/37275353200
    ID: 37275353200
    Order: 2
    Author Affiliations:
    • Electrical and Electronic Engineering Department, Hong Kong University of Science and Technology, Kowloon, Hong Kong, China

Image Sensor

• sensor_type: CMOS
• resolution: Not specified
• dynamic_range: Not specified
• pixel_size: 46µm x 48µm
• 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: Higher frame rate in 4-bit mode
• signal_to_noise_ratio: Improved SNR due to constant charge integration
• power_consumption: Lower power consumption in 4-bit mode
• noise: Reduced switching noise due to PWM encoding

Applications & Benefits

• cell_imaging: Applications in high-resolution imaging and motion detection with flexible precision settings
• benefits: Ability to switch between 8-bit and 4-bit modes for improved frame rates in dynamic scenes

Supporting Organizations

• supported_by: Research Grant Council of HK SAR, China (Project No HKUST6148/03E)

Manuscript Details

• publication_date: 23-26 May 2005

Relevancy Score

• score: 10
• missing_fields:
  • resolution
  • dynamic_range
  • focal_length
  • aperture
  • field_of_view
  • distortion
  • sensitivity
  • shutter_speed

Processed JSON Filename

request_1dff0997-b2fa-4821-a0d5-037df2934018-a_pwm_dps_with_pixellevel_reconfigurable_48bit_countersram.json