Dynamic range extension of the n-well/gate-tied PMOSFET-type photodetector with a built-in transfer gate

Self Cite

In this paper, we propose a block-based low-power complementary metal oxide semiconductor (CMOS) image sensor (CIS) with a simple pixel structure for power efficiency. This method, which uses an additional computation circuit, makes it possible to reduce the power consumption of the pixel array. In addition, the computation circuit for a block-based CIS is very flexible for various types of pixel structures. The proposed CIS was designed and fabricated using a standard CMOS 0.18 µm process, and the performance of the fabricated chip was evaluated. From a resultant image, the proposed block-based CIS can calculate a differing contrast in the block and control the operating voltage of the unit blocks. Finally, we confirmed that the power consumption in the proposed CIS with a simple pixel structure can be reduced.

Section: Introductionmentioning

confidence: 99%

Block-Based Low-Power CMOS Image Sensor with a Simple Pixel Structure

Kim¹,

Kim²,

Bae³

et al. 2014

Self Cite

“…Fig. 1 shows a cross sectional view of the gate/body-tied PMOSFET-type photodetector [16][17][18], and Fig. 2 shows its symbol.…”

Section: Introductionmentioning

confidence: 99%

A Wide Dynamic Range CMOS Image Sensor Based on a Pseudo 3-Transistor Active Pixel Sensor Using Feedback Structure

Bae¹,

Jo²,

Kim³

et al. 2012

Self Cite

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License(http://creativecommons.org/licenses/bync/3.0)which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.Journal of Sensor Science and Technology Vol. 21, No. 6 (2012) AbstractA dynamic range extension technique is proposed based on a 3-transistor active pixel sensor (APS) with gate/body-tied p-channel metal oxide semiconductor field effect transistor (PMOSFET)-type photodetector using a feedback structure. The new APS consists of a pseudo 3-transistor APS and an additional gate/body-tied PMOSFET-type photodetector, and to extend the dynamic range, an NMOSFET switch is proposed. An additional detector and an NMOSFET switch are integrated into the APS to provide negative feedback. The proposed APS and pseudo 3-transistor APS were designed and fabricated using a 0.35-Ï m 2-poly 4-metal standard complementary metal oxide semiconductor (CMOS) process. Afterwards, their optical responses were measured and characterized. Although the proposed pixel size increased in comparison with the pseudo 3-transistor APS, the proposed pixel had a significantly extended dynamic range of 98 dB compared to a pseudo 3-transistor APS, which had a dynamic range of 28 dB. We present a proposed pixel that can be switched between two operating modes depending on the transfer gate voltage. The proposed pixel can be switched between two operating modes depending on the transfer gate voltage: normal mode and WDR mode. We also present an imaging system using the proposed APS.

“…Since the 1990s, it has become possible to integrate image signal processing circuits into a single chip due to progress in the field of complementary metal oxide semiconductor(CMOS) technology [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. The smart vision chip inspired by the human retina also exhibits a lower power dissipation and a higher operating speed [1].…”

Section: Introductionmentioning

confidence: 99%

Light-Adaptive Vision System for Remote Surveillance Using an Edge Detection Vision Chip

Choi¹,

Jo²,

Seo³

et al. 2011

Self Cite

In this paper, we propose a vision system using a field programmable gate array(FPGA) and a smart vision chip. The output of the vision chip is varied by illumination conditions. This chip is suitable as a surveillance system in a dynamic environment. However, because the output swing of a smart vision chip is too small to definitely confirm the warning signal with the FPGA, a modification was needed for a reliable signal. The proposed system is based on a transmission control protocol/internet protocol(TCP/IP) that enables monitoring from a remote place. The warning signal indicates that some objects are too near.