Infrared CMOS detector arrays are key to scientific imaging, including Earth remote sensing, astronomy, and planetary exploration. Even as more digital functions are incorporated into CMOS readout integrated circuits-first, with digital-to-analog bias generation and later, with analog-to-digital conversion of the pixel readout-external electronics are still needed to supply these devices with low-noise power and provide suitable data interfaces. This paper describes two implemented designs for such electronics, one for an analog-output detector array, and one for a digital-output array. Both subsystems are intended for planetary infrared imaging spectrometers and output data with similar frame sizes, rates, and bit depth. They include DC-DC conversion from bus power, connection to the detector array through a rigid-flexible printed circuit, data buffering and output through SpaceWire, and commanding over a UART. Due to their similarities in scope and capability, it is meaningful to compare the resources needed by each subsystem. We find that digital-output detectors minimize subsystem mass and volume, but analog-output detectors minimize subsystem power and heat rejection needs. Other trade-offs are also discussed.
A Comparison of Imaging Subsystems for Analog- versus Digital-Output Detector Arrays
2023-03-04
9196060 byte
Conference paper
Electronic Resource
English
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