Realization of an effective ROIC for dual-color FPAs imaging system

Jie Zhou; Rui-jun Ding; Jun-ling Zhang; Guo-qiang Chen; Lei Gao

doi:10.1117/12.2067885

20 November 2014 Realization of an effective ROIC for dual-color FPAs imaging system

Jie Zhou, Rui-jun Ding, Jun-ling Zhang, Guo-qiang Chen, Lei Gao

Proceedings Volume 9300, International Symposium on Optoelectronic Technology and Application 2014: Infrared Technology and Applications; 93002G (2014) https://doi.org/10.1117/12.2067885
Event: International Symposium on Optoelectronic Technology and Application 2014, 2014, Beijing, China

Abstract

The implementation of an effective readout integrated circuit for 320 x 256 middle-and long-wave infrared focal plane arrays (MLIR FPAs) imaging system is detailed in this paper. The key purpose of this design is transferring the signals from dual-color detectors sequentially with effectiveness including lower noise, less voltage loss, lower power consumption, higher linearity, higher speed etc. A double sharing capacitor (DSC) structure is adopted as a solution to how to make a trade-off between the areas of capacitors and the main MOSFETs structures. Compared to the traditional charge transferring, a zero-charge-loss mechanism is applied in this circuit to guarantee a high voltage transferring efficiency. A three-stage cascaded unit gain amplifiers is used to get a high drive capability and good linearity. Meanwhile, a simple but effective power management is introduced to the section of arrays and the first output stage to ensure acceptable power consumption. Moreover, a testing line with adjustable current source is added aside to fulfill the effective testability. Now, the chip has been fabricated with the 0.35um 2P4M mixed signal technology and finished basic testing process. According to the testing results, the whole chip presents a sensitive response to illumination and the output voltage steps are clearly legible at 2.5MHz data transmission rate. As it is expected, this structure achieves 100f/s frame frequency and less than 1% nonlinearity under 5V power supply. However, the output swing reduced to 2V at room temperature of which the reason should be researched further. The total power consumption reaches 170mW.

Citation Download Citation

Jie Zhou, Rui-jun Ding, Jun-ling Zhang, Guo-qiang Chen, and Lei Gao "Realization of an effective ROIC for dual-color FPAs imaging system", Proc. SPIE 9300, International Symposium on Optoelectronic Technology and Application 2014: Infrared Technology and Applications, 93002G (20 November 2014); https://doi.org/10.1117/12.2067885

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KEYWORDS

Readout integrated circuits

Imaging systems

Infrared imaging

Capacitors

Amplifiers

Sensors

Signal processing

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