31 May 2012 MT6425CA: a 640 x 512-25μm CTIA ROIC for SWIR InGaAs detector arrays
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Proceedings Volume 8353, Infrared Technology and Applications XXXVIII; 83530D (2012); doi: 10.1117/12.964548
Event: SPIE Defense, Security, and Sensing, 2012, Baltimore, Maryland, United States
Abstract
This paper reports the development of a new CTIA ROIC (MT6425CA) suitable for SWIR InGaAs detector arrays. MT6425CA has a format of 640 × 512 with a pixel pitch of 25 μm and has a system-on-chip architecture, where all the critical timing and biasing for this ROIC are generated by programmable blocks on-chip. MT6425CA is a highly configurable and flexible ROIC, where many of its features can be programmed through a 3-wire serial interface allowing on-the-fly configuration of many ROIC features. The ROIC runs on 3.3V supply voltage at nominal clock speed of 10 MHz clock. It performs snapshot operation both using Integrate-Then-Read (ITR) and Integrate-While- Read (IWR) modes. The CTIA type pixel input circuitry has a full-well-capacity (FWC) of about 320,000e-, with an input referred read noise of less than 110e- at 300K. MT6425CA has programmable number of outputs, where 4, 2, or 1 output can be selected along with an analog reference for pseudo-differential operation. The integration time can be programmed up to 1s in steps of 0.1μs. The gain and offset in the ROIC can be programmed to adjust the output offset and voltage swing. ROIC dissipates less than 130mW from a 3.3V supply at full speed and full frame size with 4 outputs, providing both low-power and low-noise operation. MT6425CA is fabricated using a modern mixed-signal CMOS process on 200mm CMOS wafers with a high yield above 75%, yielding more than 50 working parts per wafer. It has been silicon verified, and tested parts are available either in wafer and die levels with a complete documentation including test reports and wafer maps. A USB based camera electronics and camera development platform with software are available to help customers to evaluate the imaging performance of MT6425CA in a fast and efficient way.
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Selim Eminoglu, Yigit Uygar Mahsereci, Caglar Altiner, Tayfun Akin, "MT6425CA: a 640 x 512-25μm CTIA ROIC for SWIR InGaAs detector arrays", Proc. SPIE 8353, Infrared Technology and Applications XXXVIII, 83530D (31 May 2012); doi: 10.1117/12.964548; https://doi.org/10.1117/12.964548
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KEYWORDS
Readout integrated circuits

Cameras

Short wave infrared radiation

Detector arrays

Indium gallium arsenide

Sensors

Semiconducting wafers

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