Fig. 1. Circuit diagram of unit pixel.
Fig. 2. Block diagram of averaging current adjustment technique using reference pixel array.
Fig. 3. Layout of designed readout circuit.
Fig. 4. (a) Block diagram of entire chip and (b) timing diagram of entire chip.
Fig. 6. Measurement result of pixel output voltage through integrator: (a) before calibration and (b) after calibration.
Fig. 5. Simulation result of pixel output voltage through integrator: (a) before calibration and (b) after calibration.
Fig. 7. (a) Fabricated chip and (b) test board.
참고문헌
- R. Mendez-Rial, A. Souto-Lopez, J. Rodriguez-Garcia, J. Rodriguez-Araujo, and A. Garcia-Diaz, "A high-speed MWIR uncooled multi-aperture snapshot spectral imager for IR surveillance and monitoring," 2016 IEEE Int. Conf. Imaging Syst. Tech. Proc., pp. 206-210, 2016.
- N. Shen, J. Yu, and Z. Tang, "An uncooled infrared microbolometer array for low-cost applications," IEEE Photonics Technol. Lett., Vol. 27, No. 12, pp. 1247-1249, 2015. https://doi.org/10.1109/LPT.2015.2413676
- M. Ahmed, D. P. Butler, and Z. Celik-Butler, "Low-profile, self-packaged uncooled microbolometer on a flexible substrate towards an infrared radiation sensitive skin," Proc. IEEE Sensors, pp. 2155-2158, 2014.
- T. Hatagaki, S. Kumagai, K. C. Park, and M. Sasaki, "Uncooled Infrared Sensor Using Torsional Resonator and Electrostatic Detection," 2017 Int. Conf. Opt. MEMS Nanophotonics, pp. 1-2, 2017.
- B. Dupont, A. Dupret, E. Belhaire, and P. Villard, "FPN sources in bolometric infrared detectors," IEEE Sens. J., Vol. 9, No. 8, pp. 944-952, 2009. https://doi.org/10.1109/JSEN.2009.2024041
- S. Park, T. Cho, M. Kim, H. Park, and K. Lee, "A shutterless micro-bolometer thermal imaging system using multiple digital correlated double sampling for mobile applications," IEEE Symp. VLSI Circuits, Dig. Tech. Pap., pp. C154-C155, 2017.
- M. Kim, S. Park, K. Lee, and H. Yoo, "Uncooled Infrared Micro-Bolometer FPA for Multiple Digital Correlated Double Sampling," IEEE Photonics Technol. Lett., Vol. 1135, No. 6, pp. 517-520, 2018.
- M. -W. Seo, K. Kagawa, K. Yasutomi, Y. Kawata, N. Teranishi, Z. Li, I. A. Halin, and S. Kawahito, "A 10 ps timeresolution CMOS image sensor with two-tap true-CDS lock-in pixels for fluorescence lifetime imaging," IEEE J. Solid-State Circuits, Vol. 51, No. 1, pp. 141-154, 2016. https://doi.org/10.1109/JSSC.2015.2496788
- M. -W. Seo, S. H. Suh, T. Iida, T. Takasawa, K. Isobe, T. Watanabe, S. Itoh, K. Yasutomi, and S. Kawahito, "A lownoise high intrascene dynamic range CMOS image sensor with a 13 to 19b variable-resolution column-parallel folding- integration/cyclic ADC," IEEE J. Solid-State Circuits, Vol. 47, No. 1, pp. 272-283, 2012. https://doi.org/10.1109/JSSC.2011.2164298
- H. -J. Kim, S. -I. Hwang, J. -W. Kwon, D. -H. Jin, B. -S. Choi, S. -G. Lee, J. -H. Park, J. -K. Shin, and S. -T. Ryu, "A delta-readout scheme for low-power CMOS image sensors with multi-column-parallel," IEEE J. Solid-State Circuits, Vol. 51, No. 10, pp. 2262-2273, 2016. https://doi.org/10.1109/JSSC.2016.2581819
- Y. Nitta, Y. Muramatsu, K. Amano, T. Toyama, J. Yamamoto, K. Mishina, A. Suzuki, T. Taura, a. Kato, M. Kikuchi, Y. Yasui, H. Nomura, and N. Fukushima, "High-speed digital double sampling with analog CDS on column parallel ADC architecture for low-noise active pixel sensor," 2006 IEEE Int. Solid State Circuits Conf., pp. 304-305, 2006.
- P. Payandehnia, H. Maghami, X. Meng, G. C. Temes, and H. Yoshizawa, "Sequential interstage correlated double sampling: A switched-capacitor technique for high accuracy systems," Midwest Symp. Circuits Syst., pp. 262-265, 2014.
- S. Kim, B. Choi, J. Lee, C. Oh, J. Shin, J. Park, and K. Lee, "Bolometer-type uncooled infrared image sensor using pixel current calibration technique," J. Sens. Sci. Technol., Vol. 25, No. 5, pp. 349-353, 2016. https://doi.org/10.5369/JSST.2016.25.5.349