April 2019 edition – Vol.11 no.1


The ReSMiQ management team is preparing the 2018 Annual Report, the annual symposium, the annual general assembly of the members and the annual meeting of the Board of Directors. These activities will allow us to take stock of the past year and focus on future directions.

Annual Symposium 2019
The program for this edition will be posted online in the coming weeks. It will be held on May 9 at Concordia. We can already announce the presence of the invited lecturers including Gabriela Nicolescu from Polytechnique Montreal, Hassan Rivaz from Concordia University, both members of ReSMiQ, as well as Keith Bowman from Qualcomm Technologies (USA), DL of IEEE SSCS, and Sorin Cotofana from Delft University of Technology (Netherlands), DL of IEEE CASS. See you there in large numbers.

As part of the poster competition, which will be presented during a special session, graduate students affiliated with ReSMiQ have until April 9 to send us their proposals for papers. Best presentation prizes will be awarded to the top three submissions selected by a special jury (more details).

New member
We are also pleased to announce that ReSMiQ has a new member, professor Pascal Giard from the electrical engineering department of the École de technologie supérieure. Its research interests are anchored mainly in 3 of the ReSMiQ themes, which are “Microsystems modeling, simulation and design methodologies”, “Microsystems implementation and validation”, and “Microsystems for information technology and telecommunications”. He applies his IT knowledge to these areas to quickly validate or verify ideas, develop simulators, generalize and automate design, or develop prototypes. He designed and optimized numerous algorithms, designed hardware architectures, and implemented hardware and software on several types of platforms including embedded systems. He has produced many demos, including software radios based on GNU Radio and USRPs. In addition, a real-time communication demonstration using one of the prototypes he developed which won the Best Technical Demonstration Award at the 2015 ReSMiQ Innovation Day.

As the founding organization of NEWCAS, ReSMiQ is proud to support the organization of editions outside the province of Québec. After Strasbourg (2017), Vancouver (2016), Grenoble (2015), Paris (2013), Bordeaux (2011) and Toulouse (2009), it is up to the city of Munich to host this world-class conference thanks to the involvement of Professor Erkan Isa of the Fraunhofer Research Institute and his team. As with previous editions, ReSMiQ will provide financial support to all members and students attending the conference. More details will be communicated shortly. In 2020 the conference will be back in Montreal under the chairmanship of Professor Yvon Savaria of Polytechnique Montréal. A call for papers will be distributed during NEWCAS2019.



– Dr. Martel from Polytechnique Montréal received the Pythagore Award from UQTR which celebrates the excellence of the graduates of the Trois-Rivières university.
More details

Daniel Massicotte, Sylvain Martel

– Dr. Pratte from the Université de Sherbrooke received the 2018 Radiation Instrumentatn Early Career Award at the IEEE Nuclear Science Symposium and Medical Imaging Conference.
More details

Jean-François Pratte 

Dr. Nabki and Dr. Deslandes from École de technologie supérieure who founded SPARK Microsystems, a Montreal-based company, were selected to win the 6th Nokia Open Innovation Challenge (NOIC) ahead of more than 300 companies from around the globe.
More detals: ETS News / Nokia.com / About SPARK

Frederic Nabki & Dominique Deslandes


Dr. Langlois from Polytechnique Montréal is co-chair of the DASIP conference to be held in Montreal from October 16 to 18, 2019.
More details


Scientific poster competition – Call for porposals
Submission deadline: April 9, 2019
More details

ReSMiQ Annual Symposium
Date: May 9, 2019
Place: Concordia University
Registration: Contact marie-yannick.laplante@polymtl.ca
Detailed Program


A MEMS Device Harvests Vibrations to Power the IoT: Scientists in Japan have developed a MEMS energy harvester charged by an off-chip electret. More details…

The Ultimate in Personalized Medicine, Your Body on a Chip: One day your doctor could prescribe drugs based on how a biochip version of you reacts to them. More details…

Teeny-Tiny Bluetooth Transmitter Runs on Less Than 1 Milliwatt: Bluetooth Low-Energy data packets can now be sent by millimeter-size IoT motes. More details…

Hash Your Way To a Better Neural Network: Industry has been focused on speeding the many matrix multiplications involved, but a search algorithm may provide better performance. More details…

A Peek into the Future of Wearables: Mind reading glasses, goggles that erase chronic pain, a wristband that can hear what the wearer can’t, and more futuristic wearables are on the horizon. More details…

SIGNAL is the main monthly information medium of the Microsystems Strategic Alliance of Québec (ReSMiQ). This newsletter aims to be an active link between the members of ReSMiQ and all individuals who have an interest in research and innovation in microsystems. We commit ourselves to promote in it our members’ research and increase ReSMiQ’s visibility.

ReSMiQ is a group of researchers in an interuniversity research center that can count on the support of the Fonds de recherche du Québec – Nature et technologies (FRQNT) and nine (9) Quebec universities involved in microsystems research whose mandate is to serve its members and to foster conditions for graduate student researchers to go to the end of their abilities to innovate.

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2023 International Conference on Microelectronics (ICM)
from December 17 to 20, 2023, Abu Dhabi, United Arab Emirates.
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2023 IEEE 11th International Conference on Systems and Control (ICSC)
from December 18 to 20, 2023, Sousse, Tunisia.
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2024 37th International Conference on VLSI Design and 2024 23rd International Conference on Embedded Systems (VLSID)
from January 6 to 10, 2024, Kolkata, India.
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2024 IEEE International Solid-State Circuits Conference (ISSCC)
from February 18 to 22, 2024, San Francisco, California, USA.
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2024 IEEE 15th Latin America Symposium on Circuits and Systems (LASCAS)
from February 27 to March 1, 2024, Punta del Este, Uruguay.
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2024 IEEE Custom Integrated Circuits Conference (CICC)
from April 21 to 24, 2024, Denver, Colorado, USA.
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2024 IEEE 6th International Conference on AI Circuits and Systems (AICAS)
from April 22 to 25, 2024, Abu Dhabi, United Arab Emirates.
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2024 9th International Conference on Integrated Circuits, Design, and Verification (ICDV)
from June 6 to 7, 2024, Hanoi, Vietnam.
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2024 61st ACM/IEEE Design Automation Conference (DAC)
from June 23 to 27, 2024, San Francisco, California, USA.
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2024 IEEE International Conference on Multimedia and Expo (ICME)
from July 15 to 19, 2024, Niagara Falls, Ontario, Canada.
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Prof. Jean-François Pratte
Université de Sherbrooke

Member of ReSMiQ since 2009

Jean-François Pratte received the Ph.D. in Electrical Engineering from the Université de Sherbrooke, Quebec, Canada. He was a research engineer with the Instrumentation Division, Brookhaven National Laboratory (BNL), Upton, NY, USA. He was a key designer of the Rat Conscious Animal PET scanner and was involved in the implementation of the first dual-modality PET and magnetic resonance imaging scanner. He is currently Associate Professor in the Department of Electrical and Computer Engineering of the Université de Sherbrooke. His research interests include microsystem design and integration for radiation instrumentation. More precisely, these microsystems are integrated vertically in 3D, where an array of single photon avalanche diodes is stacked over an array of CMOS readout circuits and digital signal processing, known as 3D digital Silicon Photomultiplier (3DdSiPM, see Fig.1). His contribution to the field was acknowledged by the prestigious IEEE 2018 Nuclear and Plasma Sciences Society Radiation Instrumentation Early Career Award, where the citation is “For Spearheading the Development of per Pixel Picosecond Timing with Single Photon Avalanche Diodes Three-Dimensionally Integrated to Custom Readout Circuits” (see "NEWS from our members"). This technology is currently developed for medical imaging (PET scanners), quantum key distribution for communication between ground and satellite as well as large-scale detector systems for particle physics. For instance, he is a member of the nEXO collaboration (150 international scientists, a 250M$USD project) which aim at 1) demonstrating that neutrinos are their own anti-particle, which would force a review of the particle physics standard model and 2) determining the neutrinos absolute mass. He is the author or co-author of three patents and several papers in journals and scientific conferences, including a contribution in the Journal Nature Methods. He also contributed to the start-up of a company. More details

Fig.1: 3D digital Silicon Photomultiplier (3DdSiPM)

Below is a selection of publications in recent years followed by representative work.

  1. Nolet, Frédéric; Parent, Samuel; Roy, Nicolas; Mercier, Marc-Olivier; Charlebois, Serge A.; Fontaine, Réjean; Pratte, Jean-Francois, ”Quenching Circuit and SPAD Integrated in CMOS 65 nm with 7.8 ps FWHM Single Photon Timing Resolution”, MDPI - Instrument - Special Issue Advances in Particle Detectors and Electronics for Fast Timing, Vol 2, (4), 2018
  2. C. Therrien; W. Lemaire; P. Lecoq; R. Fontaine; J.-F. Pratte, ”Energy discrimination for positron emission tomography using the time information of the first detected photons”, Journal of Instrumentation, vol 13, (1), p01012, 2018.
  3. Nolet, Frédéric and Dubois, Frédérik and Roy, Nicolas and Parent, Samuel and Lemaire, William and Massie-Godon, Alexandre and Charlebois, Serge A and Fontaine, Réjean and Pratte, J.-F.. "Digital SiPM channel integrated in CMOS 65 nm with 17.5 ps FWHM single photon timing resolution", Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol 912, 2018.
  4. Roy, Nicolas; Nolet, Frederic; Dubois, Frederik; Mercier, Marc-Olivier; Fontaine, Rejean; Pratte, Jean-Francois, "Low Power and Small Area, 6.9 ps RMS Time-to-Digital Converter for 3-D Digital SiPM", IEEE Transactions on Radiation and Plasma Medical Sciences, vol. 1, (6), pp. 486-494, 2017.
  5. Bouchard, Jonathan; Samson, Arnaud; Lemaire, William; Paulin, Caroline; Pratte, Jean-Francois; Berube-Lauziere, Yves; Fontaine, Rejean, "A Low-Cost Time-Correlated Single Photon Counting System for Multiview Time-Domain Diffuse Optical Tomography," IEEE Transactions on Instrumentation and Measurement, vol. 66, (10), pp. 2505-2515, 2017.
  6. Tetrault, MA; Therrien, AC; Lemaire, W; Fontaine, R; Pratte, Jean-Francois, "TDC Array Tradeoffs in Current and Upcoming Digital SiPM Detectors for Time-of-Flight PET," IEEE Transactions on Nuclear Science,  64, (3), pp. 925-932, 2017.
  7. Convert, L; Lebel, R; Gascon, S; Fontaine, R; Pratte, Jean-Francois; Charette, P; Aimez, V; Lecomte, R, "Real-Time Microfluidic Blood-Counting System for PET and SPECT Preclinical Pharmacokinetic Studies," Journal of Nuclear Medicine,  57, (9), pp. 1460-1466, 2016.
  8. Nolet, F; Rheaume, VP; Parent, S; Charlebois, SA; Fontaine, R; Pratte, Jean-Francois, "A 2D Proof of Principle Towards a 3D Digital SiPM in HV CMOS With Low Output Capacitance," IEEE Transactions on Nuclear Science,  63, (4), pp. 2293-2299, 2016.
  9. Tetrault, MA; Therrien, AC; Lamy, ED; Boisvert, A; Fontaine, R; Pratte, Jean-Francois, "Dark Count Impact for First Photon Discriminators for SPAD Digital Arrays in PET," Ieee Transactions on Nuclear Science,  62, (3), pp. 719-726, 2015.
  10. Therrien, AC; Berube, BL; Charlebois, SA; Lecomte, R; Fontaine, R; Pratte, Jean-Francois, "Modeling of Single Photon Avalanche Diode Array Detectors for PET Applications," Ieee Transactions on Nuclear Science,  61, (1), pp. 14-22, 2014.


Low Power and Small Area, 6.9 ps RMS Time-to-Digital Converter for 3-D Digital SiPM

Time-of-flight measurements are becoming essential to the advancement of several fields, such as preclinical positron emission tomography and high energy physics. Recent developments in single photon avalanche diode (SPAD)-based detectors have spawned a great interest in digital silicon photomultipliers (dSiPMs). To overcome the tradeoff between the photosensitive area and the processing capabilities in current 2-D dSiPM, we propose a novel 3-D digital SiPM, where the SPAD, designed for maximal photosensitive area, will be stacked in 3-D over the electronic circuits, designed in a CMOS node technology (Fig.1). All readout circuits will be implemented directly under the SPAD real estate, including quenching circuit, time-to-digital converter (TDC) and digital readout electronics. This paper focusses on the TDC element of this system, designed in TSMC CMOS 65 nm (Fig. 2). This ring oscillator-based Vernier TDC requires only 25 × 50 μm 2 and 160 μW, and achieves 6.9 ps rms timing accuracy (Table I).


Fig. 1
. 3-D architecture of a 50 × 50 μm2 single pixel.


Fig. 2. 25 × 50 μm2 ring oscillator-based Vernier TDC built in TSMC CMOS 65 nm technology.

Eq. 1. Figure of merit proposed in the paper. The variable  is the total jitter of the TDC.

TABLE I TDC Performance and Comparison, including the FOM proposed above.