A 15 μm pixel pitch 640×512 Readout Circuit (ROIC) for MWIR applications is designed and fabricated using 0.18 um CMOS process. The ROIC is implemented using Direct Injection (DI) input stage with programmable pixel gain where maximum full-well-capacity (FWC) is more than 13Mé. All analog current and voltage bias values can be programmed through a digital interface. Additionally, integration time can be programmed with 0.1 µsec resolution by internal timing circuitry. ROIC has 1, 2 and 4 output modes with a frame rate of 120fps at 4 output mode. The design supports IntegrateThen-Read (ITR) and Integrate-While-Read (IWR) modes in snapshot operation. Photodetector reverse bias voltage is controlled by adjusting the bias of the common-gate input stage at the input of DI pixel. An on-chip low-dropout voltage regulator is used to generate the detector common voltage. With 2x2 binning feature, the ROIC can also be used for 30 µm pixel pitch 320x256 photodetector arrays. An Analog-Front-End (AFE) card has been designed to operate the ROIC and to convert analog video output to a 14-bit digital value. This digital video data is handled by external video processor card which supports 1-point and 2-point Non-Uniformity Correction (NUC), histogram equalization, bad pixel replacement and filtering. The ROIC has been extensively tested with a prototype FPA at 77°K. According to these test results, functionality of all modes have been verified and a noise level of 700é is achieved at 4.5Mé FWC.
Oguz Altun, Reha Kepenek, Ferhat Tasdemir, Fatih Akyurek, Can Tunca, Mehmet Akbulut, Omer Lutfi Nuzumlali, and Ercihan Inceturkmen, "Development of a fully programmable ROIC with 15 µm pixel pitch for MWIR applications," Proc. SPIE 10177, Infrared Technology and Applications XLIII, 1017720 (Presented at SPIE Defense + Security: April 13, 2017; Published: 3 May 2017); https://doi.org/10.1117/12.2262573.
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