<title>1024x1024 resistive emitter array design and fabrication status</title>

Mismatch-tolerant read-in IC with voltage-drop compensation for infrared scene projectors

“…When an IRSP is operated in the raster mode, RIIC unit pixels deliver currents to their loads (i.e., IR emitters) such that IR emission from the emitters occurs on a row-by-row basis. This operation mode supports testing IR detectors that also operate in the raster mode, so that scene projection can be better synchronized with the detectors' row integration times [6]. As the frame rate increases in the raster mode, however, the detector-under-test observes unsettled images because only the lower emitter rows display the image for the current frame while the upper rows are transitioning to emit IR rays for the next frame [8].…”

“…High-speed IRSPs are typically operated in the snapshot mode, in which all IR emitters in an array emit IR rays synchronously every frame. For operation in the snapshot mode, a conventional RIIC unit pixel adopts a dual sample-and-hold structure with two pairs of capacitors and switches that operate alternately every two frames [6]. However, unless they are very precisely matched, the component pairs induce mismatches in the degree of charge injection and clock feedthrough every two frames, resulting in non-monotonic fluctuations in the emitter current.…”

“…Fig. 1 depicts a schematic diagram of the conventional snapshot-mode RIIC unit pixel and its timing diagram [6]. The unit pixel employs a dual S/H structure with two pairs of sampling capacitors and switches for the synchronous current output from all pixels.…”