This letter presents a mismatch-tolerant read-in integrated circuit (RIIC) with voltage-drop compensation applicable to high-speed and hightemperature infrared scene projectors. A current-programmed unit pixel is designed to compensate for ground-line voltage drops, thus improving the array-wide current uniformity. The proposed mismatch-tolerant design circumvents non-monotonic fluctuations in the output current, irrespective of the matching properties of sampling capacitors and switches. A prototype RIIC with a 32 × 32 unit-pixel array is fabricated in a 0.18-µm CMOS process. The RIIC compensates for voltage drops up to 500 mV with error currents below 1 µA and achieves 10-bit accuracy with output-current nonmonotonicity eliminated.
In this paper, a read-in integrated circuit (RIIC) for IR scene projectors (IRSPs) adopting a sub-frame control technique is proposed, which minimizes the reduction of the apparent temperature of the IR images projected from IRSPs operating at a frame rate of 30 Hz. The proposed sub-frame control technique significantly reduces the amount of scene data loss on capacitors, which is caused by leakage currents flowing through MOSFET switches during holding periods, by dividing a unit frame into 8 sub-frames and refreshing the same scene data for each sub-frame. A current-drive RIIC was designed for the higher apparent temperature of IR radiated from the emitter, and it receives the scene data as a form of analog voltages from an external DAC. A prototype chip with a 64 × 32 RIIC array was fabricated using Magnachip /SKhynix 0.35 µm 2-poly 4-metal CMOS process, and the measured maximum output data current is 230.3 µA. This amount of current ensures the projection of IR images whose maximum apparent temperature is 366.2 ℃ in the mid-wavelength IR (MWIR) when applied to a prototype emitter having a resistance of 15 kΩ.
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