Artículo
A SPAD-based 3D imager with in-pixel TDC for 145ps-accuracy ToF measurement
Autor/es | Vornicu, Ion
Carmona Galán, Ricardo Rodríguez Vázquez, Ángel Benito |
Departamento | Universidad de Sevilla. Departamento de Electrónica y Electromagnetismo |
Fecha de publicación | 2015 |
Fecha de depósito | 2019-08-12 |
Publicado en |
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Resumen | The design and measurements of a CMOS 64 × 64 Single-Photon Avalanche-Diode (SPAD) array with in-pixel
Time-to-Digital Converter (TDC) are presented. This paper thoroughly describes the imager at architectural and ... The design and measurements of a CMOS 64 × 64 Single-Photon Avalanche-Diode (SPAD) array with in-pixel Time-to-Digital Converter (TDC) are presented. This paper thoroughly describes the imager at architectural and circuit level with particular emphasis on the characterization of the SPAD-detector ensemble. It is aimed to 2D imaging and 3D image reconstruction in low light environments. It has been fabricated in a standard 0.18μm CMOS process, i. e. without high voltage or low noise features. In these circumstances, we are facing a high number of dark counts and low photon detection efficiency. Several techniques have been applied to ensure proper functionality, namely: i) time-gated SPAD front-end with fast active-quenching/recharge circuit featuring tunable dead-time, ii) reverse start-stop scheme, iii) programmable time resolution of the TDC based on a novel pseudo-differential voltage controlled ring oscillator with fast start-up, iv) a global calibration scheme against temperature and process variation. Measurements results of individual SPAD-TDC ensemble jitter, array uniformity and time resolution programmability are also provided. |
Identificador del proyecto | N000141410355
TEC2012-38921-C02 IPT-2011-1625- 430000 IPC-20111009 CDTI TIC 2012-2338 |
Cita | Vornicu, I., Carmona Galán, R. y Rodríguez Vázquez, Á.B. (2015). A SPAD-based 3D imager with in-pixel TDC for 145ps-accuracy ToF measurement. Proceedings of SPIE, 9403, 94030I. |
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