Mr. Jun-hao Yang Profile

Jun-hao Yang

at Southeast Univ

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Proceedings Article | 11 September 2013 Paper

Design and implementation of Gm-APD array readout integrated circuit for infrared 3D imaging

Li-xia Zheng, Jun-hao Yang, Zhao Liu, Huai-peng Dong, Jin Wu, Wei-feng Sun

Proceedings Volume 8907, 890744 (2013) https://doi.org/10.1117/12.2034546

KEYWORDS: Readout integrated circuits, Clocks, Avalanche photodetectors, Stereoscopy, Photodetectors, Control systems, Infrared imaging, Sensors, Infrared radiation, Digital electronics

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A single-photon detecting array of readout integrated circuit (ROIC) capable of infrared 3D imaging by photon detection and time-of-flight measurement is presented in this paper. The InGaAs avalanche photon diodes (APD) dynamic biased under Geiger operation mode by gate controlled active quenching circuit (AQC) are used here. The time-of-flight is accurately measured by a high accurate time-to-digital converter (TDC) integrated in the ROIC. For 3D imaging, frame rate controlling technique is utilized to the pixel's detection, so that the APD related to each pixel should be controlled by individual AQC to sense and quench the avalanche current, providing a digital CMOS-compatible voltage pulse. After each first sense, the detector is reset to wait for next frame operation. We employ counters of a two-segmental coarse-fine architecture, where the coarse conversion is achieved by a 10-bit pseudo-random linear feedback shift register (LFSR) in each pixel and a 3-bit fine conversion is realized by a ring delay line shared by all pixels. The reference clock driving the LFSR counter can be generated within the ring delay line Oscillator or provided by an external clock source. The circuit is designed and implemented by CSMC 0.5μm standard CMOS technology and the total chip area is around 2mm×2mm for 8×8 format ROIC with 150μm pixel pitch. The simulation results indicate that the relative time resolution of the proposed ROIC can achieve less than 1ns, and the preliminary test results show that the circuit function is correct.

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