A CMOS imager with PFM/PWM based analog-to-digital converter

Amine Bermak

A CMOS imager with PFM/PWM based analog-to-digital converter

Amine Bermak^*

^*Corresponding author for this work

Edith Cowan University

Research output: Contribution to journal › Conference article › peer-review

22 Citations (Scopus)

Abstract

An On-pixel Analog-to-Digital Converter based on both FPM and PWM schemes is reported. The proposed architecture uses a limited number of transistors that can be implemented in a small silicon area resulting in a 23% fill-factor. The digital sensor can be externally configured in order to operate under either the PFM or PWM scheme. At high-light intensities, the PFM scheme is replaced by the PWM scheme which proves to be much more efficient in terms of power consumption and clock frequency requirements. An in-built light adaptation mechanism has also been implemented which allows the sensor to better adapt to low-light intensity or to adjust the sensor saturation level. As a consequence, the sensor features a programmable dynamic range. Image lag is reduced in both schemes since a reset of the photodetector is performed after the conversion period. The pixel based ADC has been designed and fabricated using CMOS 0.25μm technology.

Original language	English
Pages (from-to)	IV/53-IV/56
Journal	Proceedings - IEEE International Symposium on Circuits and Systems
Volume	4
Publication status	Published - 2002
Externally published	Yes
Event	2002 IEEE International Symposium on Circuits and Systems - Phoenix, AZ, United States Duration: 26 May 2002 → 29 May 2002

Cite this

@article{194ad00cab0f4753ad3ce3439b4eebd5,

title = "A CMOS imager with PFM/PWM based analog-to-digital converter",

abstract = "An On-pixel Analog-to-Digital Converter based on both FPM and PWM schemes is reported. The proposed architecture uses a limited number of transistors that can be implemented in a small silicon area resulting in a 23\% fill-factor. The digital sensor can be externally configured in order to operate under either the PFM or PWM scheme. At high-light intensities, the PFM scheme is replaced by the PWM scheme which proves to be much more efficient in terms of power consumption and clock frequency requirements. An in-built light adaptation mechanism has also been implemented which allows the sensor to better adapt to low-light intensity or to adjust the sensor saturation level. As a consequence, the sensor features a programmable dynamic range. Image lag is reduced in both schemes since a reset of the photodetector is performed after the conversion period. The pixel based ADC has been designed and fabricated using CMOS 0.25μm technology.",

author = "Amine Bermak",

year = "2002",

language = "English",

volume = "4",

pages = "IV/53--IV/56",

journal = "Proceedings - IEEE International Symposium on Circuits and Systems",

issn = "0271-4310",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

note = "2002 IEEE International Symposium on Circuits and Systems ; Conference date: 26-05-2002 Through 29-05-2002",

}

TY - JOUR

T1 - A CMOS imager with PFM/PWM based analog-to-digital converter

AU - Bermak, Amine

PY - 2002

Y1 - 2002

N2 - An On-pixel Analog-to-Digital Converter based on both FPM and PWM schemes is reported. The proposed architecture uses a limited number of transistors that can be implemented in a small silicon area resulting in a 23% fill-factor. The digital sensor can be externally configured in order to operate under either the PFM or PWM scheme. At high-light intensities, the PFM scheme is replaced by the PWM scheme which proves to be much more efficient in terms of power consumption and clock frequency requirements. An in-built light adaptation mechanism has also been implemented which allows the sensor to better adapt to low-light intensity or to adjust the sensor saturation level. As a consequence, the sensor features a programmable dynamic range. Image lag is reduced in both schemes since a reset of the photodetector is performed after the conversion period. The pixel based ADC has been designed and fabricated using CMOS 0.25μm technology.

AB - An On-pixel Analog-to-Digital Converter based on both FPM and PWM schemes is reported. The proposed architecture uses a limited number of transistors that can be implemented in a small silicon area resulting in a 23% fill-factor. The digital sensor can be externally configured in order to operate under either the PFM or PWM scheme. At high-light intensities, the PFM scheme is replaced by the PWM scheme which proves to be much more efficient in terms of power consumption and clock frequency requirements. An in-built light adaptation mechanism has also been implemented which allows the sensor to better adapt to low-light intensity or to adjust the sensor saturation level. As a consequence, the sensor features a programmable dynamic range. Image lag is reduced in both schemes since a reset of the photodetector is performed after the conversion period. The pixel based ADC has been designed and fabricated using CMOS 0.25μm technology.

UR - https://www.scopus.com/pages/publications/0036293027

M3 - Conference article

AN - SCOPUS:0036293027

SN - 0271-4310

VL - 4

SP - IV/53-IV/56

JO - Proceedings - IEEE International Symposium on Circuits and Systems

JF - Proceedings - IEEE International Symposium on Circuits and Systems

T2 - 2002 IEEE International Symposium on Circuits and Systems

Y2 - 26 May 2002 through 29 May 2002

ER -

A CMOS imager with PFM/PWM based analog-to-digital converter

Abstract

Other files and links

Fingerprint

Cite this