Indium gallium arsenide and colloidal quantum dot SWIR sensors can produce stronger contrast imagery than their visible counterparts due to the reduced scattering in the SWIR band. A 640 x 512 format, 10 μm pixel pitch low-noise highsensitivity DROIC, with a capacitive transimpedance amplifier pixel front end, for SWIR imaging is presented. This DROIC has variable gain pixels with well capacities of approximately 22 ke- in high gain, 160 ke- in mid gain and 1.1 Me- in low gain. The readout boasts a low read noise of only 15 e- rms at room temperature in high gain with correlated double sampling. This DROIC can run at 700 fps full frame and 8.9 kfps for 32 x 32 window.
KEYWORDS: High dynamic range imaging, Infrared imaging, Readout integrated circuits, Digital electronics, Temporal resolution, Spatial resolution, Mid-IR, Long wavelength infrared
A 1280 x 720 format, 8 μm pixel pitch digital readout integrated circuit (DROIC) for intra-frame high dynamic range (HDR) infrared imaging is presented. Unlike traditional inter-frame HDR imaging where frames with different integration times are temporally combined to obtain an HDR frame, intra-frame HDR imaging is accomplished by spatially interpolating neighboring pixels with different integration times to obtain HDR pixels, thereby achieving the same level of dynamic range improvement without compromising temporal resolution and mostly retaining spatial resolution. In intraframe HDR mode, the infrared imager can achieve a phenomenal >57 dB improvement in dynamic range over normal mode
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