A Cmos Image Sensor With Thermal Sensing Capability And Column Zoom Adcs

• doi: 10.1109/JSEN.2019.2954082
• title: A CMOS Image Sensor With Thermal Sensing Capability and Column Zoom ADCs
• publisher: IEEE
• isbn:
• issn: 2379-9153
• rank: 548
• access_type: LOCKED
• content_type: Journals
• abstract: This paper presents a CMOS image sensor (CIS) with a zoom ADC, to quantize in-pixel temperature sensors, as well as for faster readout speed of the image pixels while maintaining low quantization noise. The proposed 15 bit zoom ADC has a 4 bit Unit Capacitor Array (UCA) SAR and a 13 bit incremental 2nd-order delta-sigma ADC (DSADC), as its first and second stage, respectively. The proposed UCA with improved switching and decoding technique minimizes capacitor area and switching energy, by 50 % and 75 %, respectively, compared to a conventional binary weight array (BWA) counterpart. Measurement results on 4 chips show the proposed zoom ADC could operate at least twice as fast, when maintaining the same signal-to-noise ratio (SNR), or improve its SNR by 9 dB, when maintaining its sampling speed, compared to a DSADC only alternative. The proposed 15 bit ADC is measured a SNR of 80.1 dB and INL and DNL within ±1.5 LSB and ±1 LSB (full scale voltage is 1 Vp-p), when operating at 31 kHz. The incorporated imager-based temperature sensors are measured to have inaccuracies within ±0.6 °C on 4 chips, between -20 and 80 °C, when quantized by the same zoom ADC.
• article_number: 8905785
• pdf_url: https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8905785
• html_url: https://ieeexplore.ieee.org/document/8905785/
• abstract_url: https://ieeexplore.ieee.org/document/8905785/
• publication_title: IEEE Sensors Journal
• conference_location:
• conference_dates:
• publication_number: 7361
• is_number: 8984669
• publication_year: 2020
• publication_date: 1 March1, 2020
• start_page: 2398
• end_page: 2404
• citing_paper_count: 4
• citing_patent_count: 0
• download_count: 1397
• insert_date: 20191119
• index_terms:
  • ieee_terms:
    • Capacitors
    • Switches
    • Temperature sensors
    • Temperature measurement
    • Signal to noise ratio
  • author_terms:
    • Zoom ADC
    • CMOS image sensor
    • temperature sensor
    • delta-sigma ADC
    • SAR ADC
  • dynamic_index_terms:
    • Image Sensor
    • Camera Sensor
    • Thermal Sensors
    • Image Pixels
    • Low Noise
    • Temperature Sensor
    • Switching Energy
    • Low Resolution
    • Dynamic Range
    • Power Consumption
    • Thermal Noise
    • Current Noise
    • Sine Wave
    • Sine-wave
    • Exponential Fit
    • Parasitic Capacitance
    • 2nd Order
    • High Dynamic Range
    • High-dynamic-range
    • Dark Current
    • Most Significant Bit
    • High Bit
    • Highest Bit
    • Circuit Implementation
    • Digital Output
    • Time-to-digital Converter
    • Extra Bits
    • Two-point Calibration
    • Temporal Noise
    • Number Of Capacitors
• authors:
  • Author Name: Shuang Xie
    Affiliation: Department of Microelectronics, Delft University of Technology, Delft, The Netherlands
    Author URL: https://ieeexplore.ieee.org/author/37086323943
    ID: 37086323943
    Order: 1
    Author Affiliations:
    • Department of Microelectronics, Delft University of Technology, Delft, The Netherlands
    • IMEC, Leuven, Belgium
  • Author Name: Albert J. P. Theuwissen
    Affiliation: Department of Microelectronics, Delft University of Technology, Delft, The Netherlands
    Author URL: https://ieeexplore.ieee.org/author/37282956500
    ID: 37282956500
    Order: 2
    Author Affiliations:
    • Department of Microelectronics, Delft University of Technology, Delft, The Netherlands
    • Harvest Imaging, Bree, Belgium

Image Sensor

• sensor_type: CMOS
• resolution: 15 bit
• dynamic_range: 80 dB
• pixel_size: 11 µm x 11 µm
• dark_current: 3.0 e-/s (at 30 °C)

Optical Data

• focal_length: N/A
• aperture: N/A
• field_of_view: N/A
• distortion: N/A

Performance Metrics

• frame_rate: up to 120 fps
• signal_to_noise_ratio: 80 dB
• power_consumption: 140 µW
• noise: Temporal noise of 0.5 e-rms (input referred)

Applications & Benefits

• cell_imaging: Used for dark current compensation in imaging applications.
• benefits: Ability to provide thermal sensing and extended dynamic range, improved SNR, reduced power consumption compared to conventional techniques.

Supporting Organizations

• supported_by: SENSA TION Project through the Dutch Government and the EC

Manuscript Details

• publication_date: 1 March1, 2020

Relevancy Score

• score: 10

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