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