In-pixel A/D converters with 120-dB dynamic range using event-driven correlated double sampling for stacked SOI image sensors

2016 ◽  
Author(s):  
Masahide Goto ◽  
Yuki Honda ◽  
Toshihisa Watabe ◽  
Kei Hagiwara ◽  
Masakazu Nanba ◽  
...  
Keyword(s):  
Dynamic Range ◽  
Image Sensors ◽  
Double Sampling ◽  
Correlated Double Sampling ◽  
Event Driven

A 4-tap global shutter pixel with enhanced IR sensitivity for VGA time-of-flight CMOS image sensors

2020 ◽  
Vol 2020 (7) ◽  
pp. 103-1-103-6
Author(s):  
Taesub Jung ◽  
Yonghun Kwon ◽  
Sungyoung Seo ◽  
Min-Sun Keel ◽  
Changkeun Lee ◽  
...  
Keyword(s):  
Time Of Flight ◽  
Light Sensitivity ◽  
Image Sensor ◽  
Image Sensors ◽  
Double Sampling ◽  
Back Side ◽  
Long Distance ◽  
Correlated Double Sampling ◽  
Cmos Image Sensors ◽  
Side Illumination

An indirect time-of-flight (ToF) CMOS image sensor has been designed with 4-tap 7 μm global shutter pixel in back-side illumination process. 15000 e- of high full-well capacity (FWC) per a tap of 3.5 μm pitch and 3.6 e- of read-noise has been realized by employing true correlated double sampling (CDS) structure with storage gates (SGs). Noble characteristics such as 86 % of demodulation contrast (DC) at 100MHz operation, 37 % of higher quantum efficiency (QE) and lower parasitic light sensitivity (PLS) at 940 nm have been achieved. As a result, the proposed ToF sensor shows depth noise less than 0.3 % with 940 nm illuminator in even long distance.

Short-wave infrared real-time high dynamic range imaging and display based on correlated double sampling

2021 ◽  
Vol 60 (6) ◽  
pp. 1774
Author(s):  
Cheng Fei ◽  
Junliang Liu ◽  
Yongfu Li ◽  
Yi Gu ◽  
Zhaojun Liu ◽  
...  
Keyword(s):  
Real Time ◽  
Dynamic Range ◽  
High Dynamic Range ◽  
Short Wave ◽  
Double Sampling ◽  
High Dynamic Range Imaging ◽  
Range Imaging ◽  
Correlated Double Sampling ◽  
High Dynamic ◽  
Short Wave Infrared

scholarly journals 1/f Noise Modelling and Characterization for CMOS Quanta Image Sensors

Sensors ◽  
2019 ◽  
Vol 19 (24) ◽  
pp. 5459
Author(s):  
Wei Deng ◽  
Eric R. Fossum
Keyword(s):  
Analog Circuits ◽  
Image Sensor ◽  
Image Sensors ◽  
Correlated Double Sampling ◽  
Cmos Image Sensors ◽  
Source Follower ◽  
Cmos Analog Circuits ◽  
Different Origins ◽  
Noise Models ◽  
Fitting Model

This work fits the measured in-pixel source-follower noise in a CMOS Quanta Image Sensor (QIS) prototype chip using physics-based 1/f noise models, rather than the widely-used fitting model for analog designers. This paper discusses the different origins of 1/f noise in QIS devices and includes correlated double sampling (CDS). The modelling results based on the Hooge mobility fluctuation, which uses one adjustable parameter, match the experimental measurements, including the variation in noise from room temperature to –70 °C. This work provides useful information for the implementation of QIS in scientific applications and suggests that even lower read noise is attainable by further cooling and may be applicable to other CMOS analog circuits and CMOS image sensors.

scholarly journals Integrating Resonator to Enhance Magnetometer Microelectromechanical System Implementation with ASIC Compatible CMOS 0.18 μm Process

Micromachines ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 635
Author(s):  
Chih-Hsuan Lin ◽  
Chao-Hung Song ◽  
Kuei-Ann Wen
Keyword(s):  
Resonant Frequency ◽  
Tuning Range ◽  
Dynamic Range ◽  
Ambient Pressure ◽  
Readout Circuit ◽  
Microelectromechanical System ◽  
Correlated Double Sampling ◽  
Driving Current ◽  
Mems Oscillator ◽  
Oscillation Characteristics

In this study, a multi-function microelectromechanical system (MEMS) was integrated with a MEMS oscillator, using the resonant frequency oscillation characteristics of the oscillator to provide the Lorentz current of the magnetometer to enhance a large dynamic range of reading, which eliminates the off-chip clock and current generator. The resonant frequency can be adjusted by adjusting the bias voltage of the oscillator to further adjust the sensitivity of the magnetometer. With the mechanical Q value characteristic, a great dynamic range can be achieved. In addition, using the readout circuit of the nested chopper and correlated double-sampling (CDS) to reduce the noise and achieve a smaller resolution, the calibration circuit compensates for errors caused by the manufacturing process. The frequency of the tuning range of the proposed structure is 17,720–19,924 Hz, and the tuning range of the measurement result is 110,620.36 ppm. The sensitivities of the x-, y-, and z-axes of the magnetometer with driving current of 2 mA are 218.3, 74.33, and 7.5 μV/μT for ambient pressure of 760 torr. The resolutions of the x-, y-, and z-axes of the magnetometer with driving current of 2 mA are 3.302, 9.69, and 96 nT/√Hz for ambient pressure of 760 torr.

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