Dr. Lei Gao Profile

Dr. Lei Gao

at Shanghai Institute of Technical Physics CAS

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Author

Publications (11)

Proceedings Article | 20 November 2014 Paper

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, 93002G (2014) https://doi.org/10.1117/12.2067885

KEYWORDS: Readout integrated circuits, Imaging systems, Infrared imaging, Capacitors, Sensors, Amplifiers, Signal processing, Mid-IR, Signal detection, Infrared sensors

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Proceedings Article | 11 November 2014 Paper

Design of the small pixel pitch ROIC

Qinghua Liang, Dazhao Jiang, Honglei Chen, Yongcheng Zhai, Lei Gao, Ruijun Ding

Proceedings Volume 9275, 92750V (2014) https://doi.org/10.1117/12.2071379

KEYWORDS: Signal processing, Capacitors, Amplifiers, Readout integrated circuits, Medium wave, Sensors, Transistors, Digital electronics, Device simulation, Switches

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Proceedings Article | 10 October 2013 Paper

ROIC with on-chip sigma-delta AD converter for HgCdTe e-APD FPA

Guoqiang Chen, Junling Zhang, Pan Wang, Jie Zhou, Lei Gao, Ruijun Ding

Proceedings Volume 8916, 89163B (2013) https://doi.org/10.1117/12.2035479

KEYWORDS: Modulators, Digital filtering, Staring arrays, Readout integrated circuits, Capacitance, Sinc filters, Mercury cadmium telluride, Quantization, Linear filtering, Optical amplifiers

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HgCdTe electron injection avalanche photodiodes (e-APDs) work at linear mode. A weak optical current signal is amplified orders of magnitude due to the internal avalanche mechanism and it has been demonstrated to be one of the most promising methods to focal-plane arrays (FPAs) for low-flux like hyper-spectral imaging and high-speed applications such as active imaging. This paper presents the design of a column-shared ADC for cooled e-APDs FPA. Designing a digital FPA requires fulfilling very stringent requirements in terms of power consumption, silicon area and speed. Among the various ADC architectures sigma-delta conversion is a promising solution for high-performance and medium size FPA such as 128×128. The performance of Sigma-delta ADC rather relies on the modulator structure which set over-sampling and noise shaping characteristics than on critical analog circuits. This makes them quite robust and flexible. A multistage noise shaping (MASH) 2-1 single bit architecture sigma-delta conversion with switched-capacitor circuits is designed for column-shared ADC, which is implanted in the GLOBALFOUNDRIES 0.35um CMOS process with 4-poly and 4-metal on the basis of a 100um pixel pitch. It operates under 3.3V supply and the output range of the quantizer is 2V. A quantization noise subtraction circuit in modulator is designed to subtract the quantization noise of first-stage modulator. The quantization noise of the modulator is shaped by a high-pass filter. The silicon area and power consumption are mainly determined by the decimation low pass filter. A cascaded integrator-comb (CIC) filter is designed as the digital decimator filter. CIC filter requires no multipliers and use limited storage thereby leading to more economical hardware implementation. The register word length of the filter in each stage is carefully dimensioned in order to minimize the required hardware. Furthermore, the digital filters operate with a reduced supply voltage to 1.5V. Simulation results show that the modulator achieves the resolution higher than 12bits and 2.4mW power consumption per ADC at 7.7k Samples/s rate.

Proceedings Article | 11 September 2013 Paper

Design of real-time image processing system for IRFPA based on FPGA

Pan Wang, Lei Gao, Guo-qiang Chen, Rui-jun Ding

Proceedings Volume 8907, 89071B (2013) https://doi.org/10.1117/12.2032306

KEYWORDS: Infrared imaging, Image processing, Field programmable gate arrays, Optical filters, Infrared radiation, Image filtering, Staring arrays, Signal processing, Switches, Image segmentation

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Proceedings Article | 11 September 2013 Paper

On-chip ADC for infrared focal plane arrays

Lei Gao, Guo-qiang Chen, Pan Wang, Rui-jun Ding

Proceedings Volume 8907, 89073A (2013) https://doi.org/10.1117/12.2033303

KEYWORDS: Synthetic aperture radar, Infrared radiation, Staring arrays, Readout integrated circuits, Capacitors, Analog electronics, Device simulation, Digital electronics, Cesium, Amplifiers

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Proceedings Article | 11 September 2013 Paper

ROIC for gated 3D imaging LADAR receiver

Guoqiang Chen, Junling Zhang, Pan Wang, Jie Zhou, Lei Gao, Ruijun Ding

Proceedings Volume 8907, 890748 (2013) https://doi.org/10.1117/12.2034589

KEYWORDS: Readout integrated circuits, Amplifiers, Capacitors, Sensors, Cadmium sulfide, Imaging systems, Signal detection, Optical amplifiers, Capacitance, Circuit switching

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Proceedings Article | 16 August 2013 Paper

ROIC for HgCdTe e-APD FPA

Guoqiang Chen, Junling Zhang, Pan Wang, Jie Zhou, Lei Gao, Ruijun Ding

Proceedings Volume 8912, 89120F (2013) https://doi.org/10.1117/12.2032849

KEYWORDS: Readout integrated circuits, Diodes, Capacitance, Sensors, Imaging systems, Avalanche photodetectors, Staring arrays, Avalanche photodiodes, Mercury cadmium telluride, Amplifiers

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Proceedings Article | 11 December 2012 Paper

A new ROIC with high-voltage protection circuit of HgCdTe e-APD FPA for passive and active imaging

Guoqiang Chen, Junling Zhang, Pan Wang, Jie Zhou, Lei Gao, Ruijun Ding

Proceedings Volume 8562, 856226 (2012) https://doi.org/10.1117/12.999495

KEYWORDS: Readout integrated circuits, Diodes, Amplifiers, Staring arrays, Sensors, Avalanche photodetectors, Mercury cadmium telluride, Imaging systems, Capacitors, Avalanche photodiodes

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Proceedings Article | 5 December 2012 Paper

Design of dual-color ROIC with double sharing capacitor

Jie Zhou, Rui-jun Ding, Lei Gao, Guo-qiang Chen, Pan Wang, Honglei Chen

Proceedings Volume 8562, 85620B (2012) https://doi.org/10.1117/12.981854

KEYWORDS: Capacitors, Readout integrated circuits, Amplifiers, Signal processing, Sensors, Transistors, Integrated circuit design, Medium wave, Infrared radiation, Signal to noise ratio

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Proceedings Article | 5 December 2012 Paper

A low-power SAR ADC for IRFPA ROIC

Lei Gao, Ruijun Ding, Jie Zhou, Pan Wang, Guoqiang Chen

Proceedings Volume 8562, 856210 (2012) https://doi.org/10.1117/12.981856

KEYWORDS: Readout integrated circuits, Synthetic aperture radar, Signal to noise ratio, Capacitors, Error analysis, Staring arrays, Digital electronics, Infrared radiation, Switches, Integrated circuit design

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Proceedings Article | 5 December 2012 Paper

Optimal design of high frequency readout IC for short-wave IRFPA

Pan Wang, Guo-qiang Chen, Lei Gao, Jie Zhou, Rui-jun Ding

Proceedings Volume 8562, 85621P (2012) https://doi.org/10.1117/12.982015

KEYWORDS: Amplifiers, Readout integrated circuits, Analog electronics, Cadmium sulfide, Transistors, Power supplies, Infrared radiation, Switches, Infrared detectors, Integrated circuit design

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Showing 5 of 11 publications

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