Nan Chen, Jiqing Zhang, Wenbiao Mao, Xiongjun Li, Linwei Song, Ling Gao, Libin Yao. High-dynamic-range and high-sensitivity IRFPA digital-pixel ROIC technology (Invited)[J]. Infrared and Laser Engineering, 2022, 51(3): 20210821
- Infrared and Laser Engineering
- Vol. 51, Issue 3, 20210821 (2022)
Fig. 1. Analog pixel circuit (direct injection structure)
Fig. 2. Principle diagram of analog integration
Fig. 3. Digital pixel circuit
Fig. 4. Digital integration
Fig. 5. Digital pixel ROIC diagram
Fig. 6. PWM digital pixel diagram and working principle
Fig. 7. Designed digital pixel diagram
Fig. 8. Timing diagram of digital pixel
Fig. 9. Comparator circuits
Fig. 10. Layout of digital pixel
Fig. 11. Simulation results of digital pixel: (a) Pulse frequency; (b) Digital output
Fig. 12. The surface morphology of LW HgCdTe epilayers
Fig. 13. LW 384×288 digital-pixel IRFPA detector chip
Fig. 14. LW 256×256 digital-pixel IRFPA detector chip
Fig. 15. LW 384×288 digital-pixel IRFPA detector module
Fig. 16. Sample image of LW 384×288 digital-pixel detector
Fig. 17. NETD of LW 384×288 digital-pixel detector (t int = 9 ms)
Fig. 18. NETD of LW 384×288 digital-pixel detector (t int = 33 ms)
Fig. 19. NETD of LW 256×256 digital-pixel detector (t int = 38 ms)
Fig. 20. Dynamic range measurement system for detector (a) and high temperature black body (b)
Fig. 21. Noise of LW 384×288 digital-pixel detector (t int = 9 ms)
Fig. 22. Noise of LW 256×256 digital-pixel detector (t int = 9 ms)
Fig. 23. Heater and soldering iron for thermal imaging test
Fig. 24. Thermal image captured by LW 384×288 digital pixel detector
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Table 1. Comparison of different digital-pixel LW IRFPA detectors
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