Cmos Image Sensor With Twostep Singleslope Adc Using Differential Ramp Generator

• doi: 10.1109/TED.2021.3102003
• title: CMOS Image Sensor With Two-Step Single-Slope ADC Using Differential Ramp Generator
• publisher: IEEE
• isbn:
• issn: 1557-9646
• rank: 1774
• access_type: LOCKED
• content_type: Journals
• abstract: This study presents a CMOS image sensor (CIS) with a two-step single-slope (TS-SS) analog-to-digital convertor (ADC), wherein the differential topology characteristics of a ramp generator are used. The proposed TS-SS ADC effectively resolves 1 most significant bit (MSB) with a half-ramping of a full analog-to-digital (A/D) reference at coarse conversion and the remaining least significant bits (LSBs) with differential slope ramping signals from the ramp generator. The proposed readout scheme maintains the existing column readout structure and does not require to regenerate the coarse-step region in each column. Moreover, the proposed TS-SS readout scheme is verified for a frame rate enhancement, that is, the efficiency increases as the bit depth of the ADC increases. A prototype CIS with the proposed 10-bit TS-SS ADC was implemented in a 1P4M 0.11- $\mu \text{m}$ CIS process with a 2.9- $\mu \text{m}$ pitch. The measurement results of the prototype CIS demonstrated the figure of merits (FoMs) of $102~\mu \text{V}\cdot $ pJ/steps and $2.79~\mu \text{V}$ /MHz/steps.
• article_number: 9509848
• pdf_url: https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=9509848
• html_url: https://ieeexplore.ieee.org/document/9509848/
• abstract_url: https://ieeexplore.ieee.org/document/9509848/
• publication_title: IEEE Transactions on Electron Devices
• conference_location:
• conference_dates:
• publication_number: 16
• is_number: 9546692
• publication_year: 2021
• publication_date: Oct. 2021
• start_page: 4966
• end_page: 4971
• citing_paper_count: 12
• citing_patent_count: 0
• download_count: 2809
• insert_date: 20210810
• index_terms:
  • ieee_terms:
    • Analog-digital conversion
    • Generators
    • Signal resolution
    • Topology
    • Linearity
    • Clocks
    • CMOS image sensors
  • author_terms:
    • CMOS image sensor (CIS)
    • differential slope (DS) ramp generator
    • two-step single-slope (TS-SS) analog-to-digital convertor (ADC)
  • dynamic_index_terms:
    • Ramp Generator
    • Frame Rate
    • Analog-to-digital Converter
    • Analog-to-digital
    • Digital-to-analog Converter
    • Least Significant Bit
    • Low Bit
    • Most Significant Bit
    • High Bit
    • Highest Bit
    • Readout Scheme
    • Readout Strategy
    • Power Consumption
    • Design Considerations
    • Pixel Resolution
    • Reference Signal
    • Capacitive Coupling
    • AC-coupled
    • Electrostatic Coupling
    • Extent Of Occurrence
    • Area Of Occupancy
    • Column In Buffer
    • Changes In Gain
    • Conversion Step
    • Linear Error
    • Total Conversion
    • Timing Diagram
    • Conversion Scheme
    • Conversion Strategy
    • Conversational Strategies
    • Readout Time
    • Dominant Noise Source
    • Silicon Area
    • Missing Signal
• authors:
  • Author Name: Sung-Yun Park
    Affiliation: Department of Electronics Engineering, Pusan National University, Busan, South Korea
    Author URL: https://ieeexplore.ieee.org/author/37085390751
    ID: 37085390751
    Order: 1
    Author Affiliations:
    • Department of Electronics Engineering, Pusan National University, Busan, South Korea
  • Author Name: Hyeon-June Kim
    Affiliation: Department of Electrical Information Communication Engineering, Kangwon National University, Samcheok, South Korea
    Author URL: https://ieeexplore.ieee.org/author/37085397854
    ID: 37085397854
    Order: 2
    Author Affiliations:
    • Department of Electrical Information Communication Engineering, Kangwon National University, Samcheok, South Korea

Image Sensor

• sensor_type: CMOS
• resolution: 180x240
• dynamic_range: Not specified
• pixel_size: 2.9 µm
• 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: 400 fps
• power_consumption: 6.61 mW

Applications & Benefits

• cell_imaging: Used in applications such as smartphones and medical devices.
• benefits: High frame rate and efficient conversion techniques.

Supporting Organizations

• supported_by: Kangwon National University, National Research Foundation of Korea (NRF)

Manuscript Details

• publication_date: Oct. 2021

Relevancy Score

• score: 10
• missing_fields:
  • dynamic_range
  • signal_to_noise_ratio
  • sensitivity
  • shutter_speed
  • dark_current
  • focal_length
  • aperture
  • field_of_view
  • distortion
  • noise

Processed JSON Filename

request_43e277f2-af4a-480a-bd62-8ed8107b5619-cmos_image_sensor_with_twostep_singleslope_adc_using_differential_ramp_generator.json