Characterisation of a CMOS charge transfer device for TDI imaging

Rushton, J.; Holland, Andrew D.; Stefanov, Konstantin D.; Mayer, Fréderic

doi:10.1088/1748-0221/10/03/c03027

Cited by 5 publications

(2 citation statements)

References 4 publications

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“…This Frame 5 illumination has been shown in units of V. Each of these devices has a specific value for conversion factor that has been calculated through a mean variance curve responsivity calibration. Further details on how this calibration is carried out can be found in [11]. Table 4 shows the calibration for the DUTs involved in the studies.…”

Section: Image Lag Characterisationmentioning

confidence: 99%

Image lag optimisation in a 4T CMOS image sensor for the JANUS camera on ESA's JUICE mission to Jupiter (Conference Presentation)

Lofthouse-Smith

Soman

Allanwood

et al. 2018

High Energy, Optical, and Infrared Detectors for Astronomy VIII

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The CIS115, the imager selected for the JANUS camera on ESA's JUICE mission to Jupiter, is a Four Transistor CMOS Image Sensor (CIS) fabricated in a 0.18 µm process. 4T CIS (like the CIS115) transfer photo generated charge collected in the pinned photodiode to the sense node through the Transfer Gate. These regions are held at different potentials and charge is transferred from the potential well under the pinned photodiode to the potential well under the sense node through a voltage pulse applied to the transfer gate. Incomplete transfer of this charge can result in image lag, where signal in previous frames can manifest itself in subsequent frames, often appearing as ghosted images in successive readouts, seriously affecting image quality in scientific instruments, which must be minimised. This is important in the JANUS camera, where image quality is essential to help JUICE meet its scientific objectives. Image lag investigation in this paper compare results pre and post Total Ionizing Dose and documents a decrease in image lag following Total Ionizing dose below device full well capacity, scaled with dose. This paper also presents two techniques to minimise image lag within the CIS115. An analysis of the optimal voltage for the transfer gate voltage is detailed where optimisation of this TG "ON" voltage has shown to minimise image lag in both an engineering model, gamma and proton irradiated devices. Secondly, a new readout method of the CIS115 is described, where following standard image integration, the PPD is biased to the reset voltage level (VRESET) through the transfer gate to empty charge on the PPD and has shown to reduce image lag in the CIS115

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Section: Image Lag Characterisationmentioning

confidence: 99%

Image lag optimisation in a 4T CMOS image sensor for the JANUS camera on ESA's JUICE mission to Jupiter (Conference Presentation)

Lofthouse-Smith

Soman

Allanwood

et al. 2018

High Energy, Optical, and Infrared Detectors for Astronomy VIII

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“…The CTI has improved considerably over the first prototype 1,2 which means that a more refined method is now needed to accurately measure CTI. In this work we start with a review of the Toad 2 chip and the EPER technique for CTI measurement.…”

Section: Introductionmentioning

confidence: 99%

A CMOS TDI image sensor for Earth observation

et al. 2015

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Time Delay and Integration (TDI) is used to increase the Signal to Noise Ratio (SNR) in image sensors when imaging fast moving objects. One important TDI application is in Earth observation from space. In order to operate in the space radiation environment, the effect that radiation damage has on the performance of the image sensors must be understood.This work looks at prototype TDI sensor pixel designs, produced by e2v technologies. The sensor is a CCDlike charge transfer device, allowing in-pixel charge summation, produced on a CMOS process. The use of a CMOS process allows potential advantages such as lower power consumption, smaller pixels, higher line rate and extra on-chip functionality which can simplify system design. CMOS also allows a dedicated output amplifier per column allowing fewer charge transfers and helping to facilitate higher line rates than CCDs.In this work the effect on the pixels of radiation damage from high energy protons, at doses relevant to a low Earth orbit mission, is presented. This includes the resulting changes in Charge Transfer inefficiency (CTI) and dark signal.

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