Davide Portaluppi
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View article: Multi-Channel FPGA Time-to-Digital Converter With 10 ps Bin and 40 ps FWHM
Multi-Channel FPGA Time-to-Digital Converter With 10 ps Bin and 40 ps FWHM Open
We present a novel architecture for multi-channel time-to-digital converters (TDCs) to be implemented into low-cost field-programmable gate arrays (FPGAs), achieving 10-ps least significant bit (LSB), 164- $mu \text{s}$ full-scale range, a…
View article: Wearable, low-cost device for monitoring cerebral blood flow with speckle contrast optical spectroscopy
Wearable, low-cost device for monitoring cerebral blood flow with speckle contrast optical spectroscopy Open
A wearable, low-cost device was developed for measuring cerebral blood flow using speckle contrast optical spectroscopy. We present its design and results from different protocols during realistic scenarios taking advantage of it being a w…
View article: Design of a 16 x 16 fast-gated SPAD imager with 16 integrated shared picosecond TDCs for non-line-of-sight imaging
Design of a 16 x 16 fast-gated SPAD imager with 16 integrated shared picosecond TDCs for non-line-of-sight imaging Open
We present the design of a new fast-gated 16 x 16 silicon SPAD array developed in a 0.16 μm BCD technology with builtin 6 ps resolution TDCs (Time-to-Digital Converters), optimized for Non-Line-Of-Sight imaging. The high temporal resolutio…
View article: A multipixel diffuse correlation spectroscopy system based on a single photon avalanche diode array
A multipixel diffuse correlation spectroscopy system based on a single photon avalanche diode array Open
The autocorrelation of laser speckles from coherent near infrared light is used for noninvasive estimates of relative changes in blood perfusion in techniques such as laser Doppler flowmetry (LDF) and diffuse correlation spectroscopy (DCS)…
View article: Time-gated SPAD camera with reconfigurable macropixels for LIDAR applications
Time-gated SPAD camera with reconfigurable macropixels for LIDAR applications Open
Many industrial and scientific applications, ranging from 3D imaging (such as LIDAR, surveillance, object tracking) to Time Correlated Single Photon Counting (TCSPC), require the ability to perform time-resolved detection of weak light sig…
View article: Time-gated CMOS SPAD array in 0.16 µm BCD with shared timing electronics and background light rejection for LIDAR applications
Time-gated CMOS SPAD array in 0.16 µm BCD with shared timing electronics and background light rejection for LIDAR applications Open
We present the design and preliminary characterization of a 32 x 32 SPAD time-gated imager in a 0.16 mu m BCD technology featuring an innovative pixel structure, composed of four single-photon detectors, independent event counters and a sh…
View article: Compact, multi-exposure speckle contrast optical spectroscopy (SCOS) device for measuring deep tissue blood flow
Compact, multi-exposure speckle contrast optical spectroscopy (SCOS) device for measuring deep tissue blood flow Open
Speckle contrast optical spectroscopy (SCOS) measures absolute blood flow in deep tissue, by taking advantage of multi-distance (previously reported in the literature) or multi-exposure (reported here) approach. This method promises to use…
View article: 32 × 32 CMOS SPAD Imager for Gated Imaging, Photon Timing, and Photon Coincidence
32 × 32 CMOS SPAD Imager for Gated Imaging, Photon Timing, and Photon Coincidence Open
We present the design and simulations of a single-photon sensitive imager based on single photon avalanche diodes (SPADs) with an innovative pixel architecture that includes four separate SPADs with independent active time-gating and quenc…
View article: Time-resolved CMOS SPAD arrays: architectures, applications and perspectives
Time-resolved CMOS SPAD arrays: architectures, applications and perspectives Open
SPADs (Single-Photon Avalanche Diodes) are the viable photodetectors for most single-photon counting and photontiming applications. Some custom SPAD and many complementary metal-oxide semiconductor (CMOS) SPADs have been reported in litera…
View article: Miniaturized 64-channel single-photon timing system
Miniaturized 64-channel single-photon timing system Open
We present a portable 64-channel photon-counting system employing a monolithic array of Single-Photon Avalanche Diodes (SPADs) and a custom-designed Time-to-Digital Converter (TDC), for single-photon counting and timing applications. The s…