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Alexandre Schmid

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Publications associées (158)

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Design of a Dual-Band Wireless Power and Data Transfer Coil for Multisite Biomedical Implants

Alexandre Schmid, Catherine Dehollain, Mohammad Javad Karimi

This paper introduces a dual-band inductive link designed to operate at both 6.78 and 13.56 MHz in the industrial, scientific, and medical (ISM) bands. The primary aim is to facilitate wireless power and data transmission in multisite biomedical implants. ...

New York2023

A cell-electrode interface noise model for high-density microelectrode arrays

Yusuf Leblebici, Alexandre Schmid, Neil Joye

A cell-electrode interface noise model is developed which is dedicated to enable the co-simulation of the cell-electrode electrical characteristics, along with the electronics of novel CMOS-based MEA. The electrode noise is investigated for Pt and Pt black ...

IEEE2009

Computation Complexity Reduction Technique for Accurate Seizure Detection Implants

Alexandre Schmid, Keyvan Farhang Razi

An automatic seizure detection method from high-resolution intracranial-EEG (iEEG) signals is presented to minimize the computational complexity and realize real-time accurate seizure detection for biomedical implants. Complex signal processing on a large ...

IEEE2022

Memory-error tolerance of Scalable and Highly Parallel Architecture for Restricted Boltzmann Machines in Deep Belief Network

Alexandre Schmid

A key aspect of constructing highly scalable Deep-learning microelectronic systems is to implement fault tolerance in the learning sequence. Error-injection analyses for memory is performed using a custom hardware model implementing parallelized restricted ...

Ieee2016

Fault-Tolerance and Reliability of Post-CMOS Systems: a Circuit Perspective

Yusuf Leblebici, Alexandre Schmid, Milos Stanisavljevic

The reliability of systems made of unreliable nanoelectronic devices is discussed in this paper. Massive defect density which may affect future fabrication technologies calls for novel solutions, where spatial redundancy and the voting scheme play a signif ...

IEEE Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2009

Three-dimensional Tip Electrode Array Technology for High Resolution Neuro-Electronic Systems used in Electrophysiological Experiments in-vitro

Yusuf Leblebici, Alexandre Schmid, Neil Joye

A three-dimensional tip electrode array technology for in-vitro electrophysiological experiments is presented. Based on simulation results obtained with a finite element model of the neuron-electrode interface, it has been shown that the electrical couplin ...

2007

A design methodology for charge-balanced stimulators based on anodic current variation monitoring

Alexandre Schmid, Reza Ranjandish

Charge balancing is a major safety concern in neural and functional electrical stimulation. This paper presents a novel and safe active charge balancing design methodology in which, after each cathodic and anodic stimulation pulse, the value of the remaini ...

2019

The PANOPTIC Camera: A Plenoptic Sensor with Real-Time Omnidirectional Capability

Yusuf Leblebici, Pierre Vandergheynst, Alexandre Schmid, Laurent Jacques, Hossein Afshari, Luigi Bagnato

A new biologically-inspired vision sensor made of one hundred "eyes" is presented, which is suitable for real-time acquisition and processing of 3-D image sequences. This device, named the Panoptic camera, consists of a layered arrangement of approximately ...

Springer Verlag2013

Wireless Power and Data Transmission for Implanted Devices via Inductive Links: A Systematic Review

Alexandre Schmid, Catherine Dehollain, Mohammad Javad Karimi

Wireless power and data communication systems in implantable medical devices (IMDs) are developed to control and report acquired biological data from an implanted device to an external stage in several medical applications. Ultrasonic, capacitive, optical, ...

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC2021

A Time-Based, Digitally Intensive Circuit and System Architecture for Wireless Neural Recording with High Dynamic Range

Alexandre Schmid, Chen Cao, Wen-Yang Hsu

A new type of wireless neural recording front-end with PWM modulation and VCO-based ADC is proposed. The target signal is first encoded into binary levels with varying pulse width by PWM modulation, which intrinsically has much higher dynamic range compare ...

2016

A 5.43-μW 0.8-V Subthreshold Current-Sensing Σ∆ Modulator for Low-Noise Sensor Interfaces

Yusuf Leblebici, Alexandre Schmid, Seyed Armin Tajalli, Nikola Katic

A micro-watt power subthreshold current modulator suitable for low-power and low-noise sensor interfaces is presented. The prototype design is based on Subthreshold Source Coupled Logic (STSCL) cells and implemented in a 0.18 μm standard CMOS technology. T ...

2014

Bit-flipping LDPC under noise conditions and its application to Physically Unclonable Functions

Alexandre Schmid

A low-density parity check (LDPC) circuit and its properties as a post-processor is proposed for physically unclonable functions (PUFs) applications. PUFs can be realized using process variations or signal noises in SRAM or other PUF circuits, whereas the ...

Ieee2016

Delta Compression of Neural Recordings for High-density CMOS-based Microelectrode Arrays

Yusuf Leblebici, Alexandre Schmid, Neil Joye

Recent high-density CMOS-based MEAs contain thousands of electrodes. Hence, an off-chip acquisition system performing data compression prior to visualization and analysis on a computer is required in order to handle the large amount of data generated by ac ...

2010

An Active Charge Balancing Method Based on Chopped Anodic Phase

Alexandre Schmid, Reza Ranjandish

A new method for safe electrical neural stimulation is proposed. A negative feedback is used to automatically produce short anodic pulses according to the remaining voltage. The period of the short anodic pulses varies according to the remaining voltage. T ...

IEEE2018

Evaluation sismique de bâtiments existants - Approche basée sur le risque introduite en Suisse

Pierino Lestuzzi, Alexandre Schmid

2009

Compact Low-Power Cortical Recording Architecture for Compressive Multichannel Data Acquisition

Pierre Vandergheynst, Alexandre Schmid, Mahsa Shoaran, Mahdad Hosseini Kamal

This paper introduces an area- and power-efficient approach for compressive recording of cortical signals used in an implantable system prior to transmission. Recent research on compressive sensing has shown promising results for sub-Nyquist sampling of sp ...

2014

Enhanced Compressed Look-up-Table Based Real-Time Rectification Hardware

Yusuf Leblebici, Alexandre Schmid, Abdulkadir Akin, Halima Najibi, Luis Manuel Gaemperle

Real-time disparity estimation requires real-time rectification which involves solving the models of lens distortions, image translations and rotations. Low complexity look-up-table based rectification algorithms usually require an external memory to store ...

Springer-Verlag Berlin2015

Analysis of Power Consumption and Propagation Delay in Voltage Level Shifters

Alexandre Schmid, Mehdi Saberi

The analysis of the operation of non-linear circuits such as voltage level shifters and latched comparators and therefore prediction of their propagation delay and power consumption are challenging. This is because the operating points of the employed non- ...

Institute of Electrical and Electronics Engineers (IEEE)2025

Embedded non–volatile memory study with surface potential based model

Yusuf Leblebici, Alexandre Schmid, Davide Garetto

Coupling coefficients calculation is known to be a critical issue in embedded Non-Volatile Memory (eNVM) compact modeling. In this paper we have implemented the charge balance method within the Brew’s Charge Sheet Model equation, determining the floating g ...

2009

Real-time Implementation of Gaussian Image Blending in a Spherical Light Field Camera

Yusuf Leblebici, Alexandre Schmid, Vladan Popovic, Hossein Afshari

Panoptic is a custom spherical light field camera used as a polydioptric system where imagers are distributed over a spherical geometry, each having its own vision of the surrounding and a distinct focal plane. The spherical light field camera records ligh ...

Ieee2013