Low-noise, fast frame-rate InGaAs 320 x 256 FPA for hyperspectral applications

Jan Vermeiren; Urbain Van Bogget; Guido Van Horebeek; Jonas Bentell; Peet Verbeke; Thierry Colin

doi:10.1117/12.818948

6 May 2009 Low-noise, fast frame-rate InGaAs 320 x 256 FPA for hyperspectral applications

Jan Vermeiren, Urbain Van Bogget, Guido Van Horebeek, Jonas Bentell, Peet Verbeke, Thierry Colin

Proceedings Volume 7298, Infrared Technology and Applications XXXV; 72983N (2009) https://doi.org/10.1117/12.818948
Event: SPIE Defense, Security, and Sensing, 2009, Orlando, Florida, United States

Abstract

InGaAs is the material of preference for uncooled imaging in the [0.9-1.7 μm] SWIR range, as it can be manufactured on low cost InP substrates in a mainstream technology for optical telecommunications. By removing the substrate the spectral range can be extended to the [0.6 - 1.7 μm] range. In this way low cost, room temperature operated FPAs cameras for imaging and hyperspectral applications can be developed. The FPA is built around a low power CTIA stage with 3 S&H capacitors in the 20*20 um² unit cell. This approach results in a synchronous shutter operation, which will support both ITR and IWR operation. In IWR mode the integration dead time is limited to max. 10 μsec. The CDS operation yields in a high sensitivity combined with a low noise: This presentation will focus on the development of a 20 μm pitch 320*256 device, with the following main characteristics: 20 μV/e-sensitivity and < 60 e-noise. The 4 low-power, differential outputs are enabling to drive an output load of > 30 pF at 40 Msamples/sec each, resulting in a > 1700 Hz frame rate, while at the same time the overall nominal power dissipation is < 200 mW. The ROIC is realized in a 0.35 um technology and the outputs are designed to drive directly a 3.3 V, 1.5 V VCM differential AD convertor. The circuit also supports a NDR operating mode to further reduce the noise of the FPA. A small from factor camera with Cameralink output is built around this FPA.

Citation Download Citation

Jan Vermeiren, Urbain Van Bogget, Guido Van Horebeek, Jonas Bentell, Peet Verbeke, and Thierry Colin "Low-noise, fast frame-rate InGaAs 320 x 256 FPA for hyperspectral applications", Proc. SPIE 7298, Infrared Technology and Applications XXXV, 72983N (6 May 2009); https://doi.org/10.1117/12.818948

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