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Joël BertrandJB

Joël Bertrand

Electronics Engineer | Radio

€556/day
6 projects
Vignols, FR
15+ years

Average response time: 1 hour

Freelancer profile translated to English.
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About Joël

Electronics engineer, aerospace telecommunications training, I defended a thesis in signal processing then I ran a company and its employees for over ten years, carrying out technical missions in France and abroad. For several years now, I have been refocusing my activities on pure technology, namely electronic design from requirement to prototype or small series, whether for client needs or for my own company's needs.

My skills range from analog electronics to digital electronics, including programming. I use VHDL for everything related to FPGAs. I have a complete electronics laboratory on my premises (four-channel oscilloscopes, spectrum analyzers, vector analyzers, signal generators, pattern generators, RLC bridges, placement machines, reflow ovens, 3D printers, laser cutting machines...) and a semi-anechoic chamber.

My recent achievements include communication boards (RFID, NFC, 2G/3G/4G, LoRaWAN and Wifi), specific high-voltage power supplies, dynamo regulators for vintage vehicles, and high-fidelity amplifiers (with differential correction). For specific needs, I sometimes handle enclosure design with industrial sheet metal or 3D printing.

I offer services ranging from design to prototyping and manufacturing. Thanks to qualified subcontractors, I can assist you with the industrialization phases. The quotes I provide are detailed, all-inclusive, and without surprises for the client.

I do not work with development boards; I genuinely design reliable and sustainable electronics that you can industrialize without surprises.

Feel free to browse my portfolio and contact me.
  • English

    Conversational

  • German

    Conversational

  • French

    Native or bilingual

Can work on-site
Vignols (up to 50km), Brive-la-Gaillarde (up to 100km), Paris (up to 20km), Colmar (up to 50km), Pesmes (up to 50km)

Experience

  • Voxline
    Design of a Wien bridge filter equalizer
    TECH
    August 2025 - December 2025 (4 months)
    Brive-la-Gaillarde, France
    Design of a two-times ten-band equalizer based on the principle of Wien bridge resonant filters, separating its outputs between low and high frequencies (around 135 Hz) for use with a bi-amplification system.

    The circuit was designed around locally feedback triodes and was fully simulated using ng-spice (frequency response and total harmonic distortion) before proceeding with the fabrication of the circuits on eight-layer FR4-180 PCBs.
    Analog Electronics SPICE triodes
  • Confidentiel
    Communication Systems
    DEFENSE AND MILITARY
    June 2025 - December 2025 (6 months)
    Brive-la-Gaillarde, France
    Design of several UHF communication boards (868 MHz band) with antenna diversity, incorporating both CC1120 or SX1262 modulators and cellular modems. Antenna qualification, calculation of antenna tuning circuits. Constrained routing on 10-layer boards of 40 mm x 40 mm.
    UHF Communication STM32 4G/LTE
  • FUG
    VHDL SoC Design
    TECH
    February 2024 - December 2024 (10 months)
    Tempe, United States
    Design of an MC6809 compatible processor core (pin-to-pin in a 40-pin DIL package).

    Project continued for my own use by adding:
    - Additional registers and instructions from the HD6309;
    - A floating-point unit (single and double precision);
    - 64-bit extensions to the processor core;
    - Peripherals (ACIA, PIA, PTM, I2C, SPI);
    - Cache memories (level 1 'direct mapped' and level 2 'associative');
    - A bus arbitration system;
    - A HyperRAM interface;
    - A Memory Management Unit (in progress).

    An Artix7 FPGA can today accommodate four 63F09 cores (ALU/FPU 64-bit, 36-bit address bus after MMU) operating at 600 MHz.

    More information here: https://63f09.systella.fr
    VHDL Embedded Systems Assembly

Reviews

5.0

Out of 3 ratings

J

Julien

Velum Labs

Reviewed on 7/4/2023

Competent, diligent, and curious individual who does not hesitate to delve deep into the specifics of a project to improve it.
J

Jean-Yves

Jean-Yves SPITZ

Reviewed on 3/16/2022

Competent, rigorous, and deadline-aware individual.

Recommendations

GV
FU
Gilles Viguié and 1 other person have recommended Joël

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Education

  • Aerospace Electronics and Telecommunications Engineer
    ESME-Sudria
    1996
    Électronique analogique et numérique. Traitement du signal. Télécommunications aérospatiales. Mécanique générale.
  • Master's degree in Communication Devices and Techniques
    ENST PARIS
    1998
    Optoélectronique. Hyperfréquences. Communications numériques.

Certifications

  • BR/H0
    Dekkra
    2013
    Electrical Qualification

Skill set

Categories