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I am an Electrical/Electronic Engineer having master's degree in electrical/Electronic Engineering with 14 years of experience in the field of Power electronics, Embedded systems, analog and digital electronics, Wireless sensor network and Internet of Things. I have developed hardware and Embedded systems of IOT devices, Environment Monitoring devices, Power electronic converters (DC -DC, AC to DC and DC to AC), Inverters, VFD (variable frequency Drive) simulation and Testing. I have skills and experience in following areas ✔Circuit Designing (analog and Digital), from concept to prototype and prototype to production ✔Firmware development based on STM32, Arduino, Raspberry Pi, ESP32 and ESP8266 ✔Wireless communication based on Lora Modules, Zigbee modules, NRF Module, NRF51822 BLE module ✔ IoT / Embedded Electronics Engineering Projects ✔Mathematical Modeling, Components Selection, Schematic Designing and PCB designing based on Altium Designer. ✔sourcing of components, negotiation of components and manufacturing of customized product ✔Testing and Debugging of Electronic circuits. ✔Hardware Designing of data loggers with sensors intergeneration. ✔Assembly services of electronic circuits and products ✔Robotics and automation ✔Power electronic converter circuit (buck converter, boost converter, inverters) designing testing and debugging ✔ ESP32 based projects like water quality tester, AI based gesture recognition system ✔ESP32 CAM based face recognition system ✔ESP32 based AI camera ✔ Arduino based embedded system projects using sensors and actuators' ✔Deep knowledge and expertise DC and AC motor driver designing ✔ EMI and EMC testing ✔Experienced Schematic and PCB designing trainer ✔ Experience embedded systems and IOT trainer

I’m a professional PCB design engineer with extensive experience in developing high-speed digital, RF, and embedded system hardware. Over the years, I’ve successfully designed and delivered dozens of production-ready PCBs across various industries — from industrial automation and telecommunications to IoT, radar, and medical electronics. My work covers the entire product development cycle, including schematic design, PCB layout, signal & power integrity (SI/PI) analysis, EMI/EMC optimization, and DFM validation for mass production. I focus on precision, performance, and reliability, ensuring that every design meets the client’s technical and manufacturing requirements. My Expertise PCB Design: Multilayer, high-speed, RF/microwave, and mixed-signal boards High-Speed Interfaces: DDR, USB, HDMI, Ethernet, LVDS, PCIe EDA Tools: Altium Designer/Kicad/easyEDA/Eagle / OrCAD / Cadence Allegro /PADS Simulation Tools: Proteus/Multisim/CST / HFSS / ADS / LTspice / HyperLynx Hardware Design: Analog and digital circuits, power management, embedded boards Manufacturing Optimization: DFM, DFT, impedance control, EMC compliance Collaboration: Strong coordination with firmware, mechanical, and production teams What I Can Deliver ✅ Complete circuit & PCB design (Prototype to Mass Production) ✅ Enclosure design for PCB and 3D printing ✅ High-speed & RF PCB layout with impedance matching and SI/PI analysis ✅ EMI/EMC issue troubleshooting and optimization ✅ Design improvement and cost reduction consulting ✅ Antenna and RF front-end layout design ✅ Documentation for manufacturing and assembly

👋 Hello, I am YanXia Xu. Embedded Systems Engineer with nearly 30 years of experience in industrial automation and embedded firmware development. Specialized in MCU firmware, RTOS-based systems, industrial communication protocols, and embedded Linux platforms. Extensive experience supporting Japanese enterprise projects and long-term industrial product maintenance. Strong background in debugging, hardware-software integration, and reliable embedded system design.

Professional Summary 1.Senior Hardware Engineer with 15+ years full-cycle product development experience, specializing in medical rehabilitation equipment, industrial HMI, high-speed embedded core boards, IoT collectors, surveillance hardware, and custom automated test fixtures.Independently deliver end-to-end hardware work: 2.requirement analysis, component selection, schematic & 2–8 layer PCB layout, high-speed signal impedance matching, EMC/safety rectification; 3. STM32/GD32 MCU firmware development, BOM/Gerber/SMT production files, PCB factory coordination, prototype verification and mass production after-sales troubleshooting. Core Technical Skills 1.Hardware Design: Schematic capture, multi-layer PCB layout, high-speed signal integrity, timing & impedance matching 2.MCU & Communication: STM32/GD32, RK3399, Hisilicon HI35xx; CAN, RS485 Modbus, 4G/Wi-Fi, TCP, 4–20mA analog acquisition 3.Product Compliance: EMC radiation/conducted test, medical safety rectification, CE certification support 4.Custom Fixture: Automatic production test tool hardware + firmware design, labor & cycle time optimization 5.Mass Production: BOM, Gerber, SMT coordinate output, PCB sampling follow-up, production defect resolution 6.Industries: Medical rehabilitation, industrial touch screen, IPC/NVR surveillance, IoT, elevator control, UV curing, smart wireless devices

Thank you for taking the time to view my profile. I'm a professional electrical engineer with experience in power electronics, digital circuits, analog circuits, and HF RF circuits. My favorite EDA tools are OrCAD or KiCad for schematics capture, Allegro or KiCad for PCB layout, LTspice for analog circuit simulation, Verilog/SystemVerilog/Vivado/ModelSim/Questa for digital and FPGA design, SIMetrix/SIMPLIS for SMPS design, dsPIC33/MPLAB/PowerSmart for digital power design. Still, I have used many other EDA tools under customer/client requests in the past, such as Pspice, TINA-TI, ADS, Quartus Prime, etc. I'm also a professional programmer with experience in PC BIOS, BSP, Linux, and Android, and I'm familiar with many programming languages such as x86 assembly, ARM assembly, C, C++, Java, Python, HTML, CSS, XML, SQL, JavaScript, Unix shell script. I have many mass production designs for domestic clients and some from foreign countries. If you want reference to some of my product designs, I can ask for the client's permission as they are mostly NDA secured. I'm serious about the intellectual properties of others. But you can view my portfolio for a LF N2PK VNA and a Red Pitaya STEMlab125 designs, both are the few best in class amateur measurement equipment with professional device quality, I improved on their original design to better fit my daily electrical test requirements, and as I just produce my own improved design for my private use, so it's legal for me to show them here without IP issues with the copyright holders. My current interest and most recent skills are FPGA, SMPS, digital power, motor control, and automotive electronics.

--Professional Wide range electronic PCBA/ components sourcing with strong negotiate skill and technical background(Schematic,PCB layout,circuits design,QC...); --Project management,new product researching,source manufacturer for new concept/product; --Professional electronic circuit design:Schematic,PCB layout,prototyping,test,and Engineering support; --SMT work shop with 4 set SMT machines;Two DIP and Assembling lines,to satisfy various requirement of the clients; --HDI and High speed PCB board sourcing for AI products