Publications de Alexandre Schmid

A Sequential High-Frequency Switched-Capacitor Neuro-Stimulation Technique with 77% Power Efficiency

This paper proposes a new energy-efficient technique for high-frequency switched-capacitor stimulation systems. The proposed sequential high-frequency switched-capacitor (S-HFSC) structure employs a two-step charge transfer technique to reduce the voltage ...

SPRINGER BIRKHAUSER2025

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

Split weight distribution learning for binary neural networks exploiting nano-memristive graphene/sumanene/graphene devices

Alexandre Schmid

Research in artificial intelligence (AI) and neural network (NN) technologies has been boosted by recent hardware advances, while the emergence of self-synthesized materials such as nanocarbons has attracted much attention to overcome the limitations of Si ...

IOP Publishing Ltd2025

Analysis of Integrator-Differentiator Transimpedance Amplifiers: Speed and Gain Tradeoff Introduced by Parasitic Capacitances

Alexandre Schmid, Matteo Dal Peraro, Mehdi Saberi

In this paper, the frequency behavior and stability of current recording systems employing continuous-time integrator-differentiator transimpedance amplifiers (TIAs) are analyzed. The proposed comprehensive analysis provides designers helpful design rules ...

Institute of Electrical and Electronics Engineers (IEEE)2025

A Two-Wired High Input Impedance and High CMRR Active Electrode Insensitive to Component Mismatch

Alexandre Schmid, Mehdi Saberi

This article proposes a new two-wired amplifying active electrode (AE), presenting a high input impedance and a high common-mode rejection ratio (CMRR). In the proposed structure, the input impedance and the CMRR of the system are considerably increased by ...

Ieee-Inst Electrical Electronics Engineers Inc2024

An Analysis of an ASK Demodulator With Dual Self-Biased Separated Voltages for Implantable Applications

Alexandre Schmid, Catherine Dehollain

A new structure of low-power demodulator named 'separated-Vb' amplitude shift keying (ASK) demodulator is proposed. The circuit is based on the switching behavior of the core digital shaper with different bias voltages, which improves its operation at low ...

2024

A Wireless Power Conversion Chain With Fully On-Chip Automatic Resonance Tuning System for Biomedical Implants

Alexandre Schmid, Catherine Dehollain

This paper presents a wireless power conversion system designed for biomedical implants, with integrated automatic resonance tuning. The automatic tuning mechanism improves power transfer efficiency (PTE) by finely tuning the resonant frequency of the powe ...

Ieee-Inst Electrical Electronics Engineers Inc2024

A High-Gain Transimpedance Amplifier Using Highly-Linear and Symmetric Multi-Stage Pseudo-Resistors

Alexandre Schmid, Mehdi Saberi

© 2024 IEEE.This paper presents a high gain, low power, and highly linear structure for integrator-differentiator transimpedance amplifiers (TIAs) employed in biological recording systems. In order to improve the linearity of the structure, a symmetric and ...

Institute of Electrical and Electronics Engineers Inc.2024

An offset-enhanced active rectifier with delay compensated active diodes for wirelessly powered biomedical implants

Alexandre Schmid, Catherine Dehollain

This letter presents the design of a 13.56 MHz offset-enhanced full-wave active rectifier, tailored for wirelessly powered biomedical implants. The design incorporates digitally assisted, delay-compensated active diodes and symmetrical bulk biasing in the ...

2024

Wireless Power and Data Transceiver in A Central Implanted Unit for Biomedical Applications

Alexandre Schmid, Catherine Dehollain

This paper presents a wireless power and data transmitter designed for central implanted units (CIUs) in the context of biomedical applications. This CIU is positioned within the human body or brain to supply power from stored battery energy to specific im ...

Institute of Electrical and Electronics Engineers Inc.2024