Logarithmic InGaAs detectors with global shutter and active dark current reduction

Yang Ni; Bogdan Arion; Christian Bouvier; Vincent Noguier

doi:10.1117/12.2176392

12 May 2015 Logarithmic InGaAs detectors with global shutter and active dark current reduction

Yang Ni, Bogdan Arion, Christian Bouvier, Vincent Noguier

Proceedings Volume 9485, Thermosense: Thermal Infrared Applications XXXVII; 94850L (2015) https://doi.org/10.1117/12.2176392
Event: SPIE Sensing Technology + Applications, 2015, Baltimore, MD, United States

Abstract

In this paper, we present newly developed logarithmic InGaAs detectors with global shuttering and also an active dark current reduction technique to ensure ambient temperature operation without TEC for industrial applications. The newly released detectors come with both VGA (15um pitch) and QVGA (25um pitch) resolutions, giving the possibility to use lens less than 1-inch size. The logarithmic response is obtained by using solar-cell mode InGaAs photodiodes. The VGA and QVGA ROICs have 3 analog memories inside each pixel which permit, except the classic ITR, IWR and CDS modes, a new differential imaging mode which can be a useful feature in active imaging systems. The photodiode frontend circuit, in pure voltage mode, is made with non-inverting amplifier instead of CTIA. The reason of this choice is that the exposure time can be shortened without need of excessive power consumption as in CTIA front-end. We think that this arrangement associated with true CDS could match the noise performance of CTIA based one. VGA and QVGA ROICs have been designed and manufactured by using 0.18um 1P4M CMOS process. Both ROIC have been tested with success and match the design targets. The first batch of both detectors is under fabrication and will be presented during the conference.

Citation Download Citation

Yang Ni, Bogdan Arion, Christian Bouvier, and Vincent Noguier "Logarithmic InGaAs detectors with global shutter and active dark current reduction", Proc. SPIE 9485, Thermosense: Thermal Infrared Applications XXXVII, 94850L (12 May 2015); https://doi.org/10.1117/12.2176392

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KEYWORDS

Sensors

Readout integrated circuits

Indium gallium arsenide

Photodiodes

Camera shutters

Capacitance

Amplifiers

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