Engineer Design

ALEX STUHL, PhD

*********@*****.*** 214-***-**** skype alex.stuhl

Summary

Motivated to develop new technology and transform ideas into successful products. Experience led multi-functional teams. Strong experience in measuring fields including radio frequency (RF), analog circuits, AD-DA conversions, COTS, diagnostics, EMI/EMC, ESD, MEMS, microprocessors, optical, precision low-level signal acquisition, power supplies, real-time system, signal integrity, simulation, systems Areas of specialization

• Project Engineering & Proposal Development • Systems Engineering • Research & Development Engineering Specialized Design Tools

Designer, DXP, Protel, PCAD (Altium)

DxDesigner, PADS, Hyperlynx (Mentor Graphics)

OrCAD, Pspice (Cadence Design Systems)

Eagle (CADSoft), TINA (DesignSoft)

SIMetrix (SiMetrixTechnologies)

Designer, HFSS (ANSYS-Ansoft Corp)

Genesys, Sonnet (Keysight Tech)

Microwave Office (NI-AWR Corp)

FPGA/CPLD-VHDL (Xilinx, Altera)

C Complier (Keil, MicroChip-MPLab, Arduino)

Code Composer Studio IDE (Texas Instruments)

LabVIEW, Multisim (National Instruments)

MatLab (MathWorks)

AutoCAD LT (Autodesk)

Pro-Designer (LINOS Photonics)

MS Office, Visio, PowerPoint, Project (Microsoft)

Experience

Consultant, Jan 2010 – Present (on contract)

Maintain projects proposal, budget, schedule, forecast, and test plan. Interfacing with suppliers and vendors. Signal integrity: PSpice, LT Spice, SIMetrix simulation. Conduct design reviews: Preliminary Design Reviews (PDR).Trade-Offs. Redundancy. Electromagnetic radiation. ESD-EMI-EMC issue. Agile environment. Factory Acceptance and System Integration Tests. MIL-STD-461E/464C/810G, DO-160, DO-254 Clide, Remote Dallas, TX Jan 2015-Present

Architect, Design portable Bluetooth LE motion sensors (MEMS 9 axis: accelerometers, gyroscopes, digital compasses) for variable applications. Systems stretch prototypes, platforms, wearable devices. Investigate new technologies and develop the next generation platform

Development commercial lighting LED systems 40-80W: input 85-240VAC output 48V@1.6A, PFC THD less 5%, effective 92-95% Acutus Medical, Inc Carlsbad, CA Jan-Feb 2016

Development multi-outputs power supplies (total 500W) for medical ultrasound equipment. EN60601 medical device compliance. Baker Hughes Inc, Houston, TX Oct 2013-Nov 2014

Architect, Designed RF section downhole Multi Frequency Dielectric Resistivity (MFDR) Tool for LWD application use five carriers frequencies in sequence from 30MHz to 1GHz with cancel-out error compensation technique. Create adaptive algorithm measurement final parameters dielectric constant base of the formation conditions. RF section include frequency synthesizer, switchable gain LNAs, direct quadrature zero-IF conversion 4 receivers-6 transmitters, selectable low pass filter for each carrier frequency, 6 wideband PA GaN 40dBm CW. Switch mode power supplies (SMPS). Kick-Off. Jigs/fixtures/platforms/mock ups. System test. Qualify parts 185oC. Hybrid module study

Designed downhole ultrasonic imager focus on front-end and back-end circuits matrix 192 transducers for 6 dynamic beams.High voltage issue Oliden Technology LLC, Sugar Land, TX Jan-Aug 2013

Designed Downhole Azimuth Resistivity Tool (DART) for MWD application use three frequency bands 2MHz, 400/100KHz investigation. Transmitters use Enhancement GaN transistors D-class; receivers base of ultra-low noise LNA architecture. Phase-Amplitude used oversampling technique. System architect, synchronization, Direct Digital Synthesizers (DDS), PWM, Navigation system, SMPS GAD Light, La Jolla, CA May-Dec 2012

Development medical portable devices (diabetes management system) base of ARM Cortex M3, M4; wireless communication 3G, Bluetooth 4BLE, GPS. Power circuits (batteries, chargers, wireless charging, LDOs), audio-amplifiers, CODEC, displays, MEMS motion devices. Memories, I2C devices. Systems stretch prototypes. Flex circuits. EN60601 Show Corp, Houston, TX March-Apr 2012

Designed equipment for non-destructive testing of pipes utilizing ultrasonic phased array technology. High voltage issue. EMI/EMC issue. General Dynamics SATCOM, Dallas, TX May 2011-Jan 2012

Made proposal, specs, test plans for RF portions (L, S, C and X bands) and optic links SATCOM GOES-R station Goodrich Corp, Vergennes, VT June-Dec 2010

System architect, Designed industrial/aircraft applications wireless sensor units network of 900MHz, 2.4GHz ISM bands 802.11, 802.15.4 including enhanced data rates to 2-11-150Mbps. GP/ Patch antennas. Antenna Testing using anechoic chamber near field/far field measurements Processors SoC, MPS430 (TI) / PowerPC (Freescale); memories DDR2 SDRAM, Flash; USB OTG, CAN, RS232, RS485, I2C, Ethernet interfaces. AQEC parts selection. Exchange battery monthly-yearly option. Lithium base rechargeable battery option. ESD issue Clide, Remote Dallas, TX Jan-May 2010

Created data base for parts working temperature 225oC: test procedures and evaluation-test PCBs Halliburton Energy Services, Inc, Houston, TX

Senior Techncal Adviser-Electronics, June 2007–Jan 2010 2 Professional Resume

Led the RF Group. LWD. Performed systems architecture down to the component level, generated specs and consideration documents. Executed robust image rejection architecture trade studies and HW/SW partitioning. Preparation and presentation of engineering concepts and data. Calculated RF link budget. SWR calculation in real time. Working temperate up to 180oC. Taconic teflon PCB. EMI-EMC issue. Design for manufacturability (DFM). Reliability testing HALT; MTBF calculations.

Architect, Designed High Frequency Dielectric Tool (HFDT) equipment RF section includes five waveguide transducers, synthesizer 1GHz

(National Semi), IQ modulator (transmitters Analog Device) and direct conversion IQ demodulators (receivers Analog Device), switchable low noise amplifiers chain up to 30-63dB (NEC, Avago), LDMOS RF power amplifiers up to 33dBm (Freescale), TX directional couplers 20dB

(Anaren), RF detectors (Analog Devices), RF prescalers 2-8-8 (Peregrine Semi), RF digital step attenuators 5bit (Peregrine Semi). Microcontroller circuit Microchip, DAC-ADC (Analog Device) 14bit 25Msps for each channel. Low noise DC-DC converters. Adaptive algorithm measurement. Full DSP control (BlackFin, Analog Device), oversampling baseband. Compensation technique. Full diagnose equipment.

Designed not-standard equipment for debugging and manufacturing a test RF section by Kelly board XEM3010 and LabView option.

Created data base for optical sensor parts working temperature 180oC: test procedures and evaluation-test PCBs. Continental Electronics Corp, Dallas, TX

Principal Project Engineer, Apr 2006–May 2007

Project Lead. Performed systems architect down to the component level, generated specs and consideration documents. Execute architecture trade studies and HW/SW partitioning. Signal integrity. Supervised mechanical and PCB layout. ESD-EMI-EMC issue. DO-160, DO-254.

Designed RF Exgine PCI card for high definition radio broadcast equipment on iBiquity platform TI DSP 320C6415T. Designed target board: high speed 16b ADC-DAC LVDS buses control by Kelly board XEM3010

Involve designed RF CW transmitters (include power supply) 1 and 2 Megawatts for Brookhaven National laboratory/US Department of Energy

Designed low noise digital control power supplies for broadcasting transmitters 1-20KW: Modular, Power Factor Correction (PFC), full bridge converter-synchronous rectifier (phase shift ZVT converter) TI DSP TMS320F2801. Efficiency 95-96%. High voltage issue. EMI/EMC issue

Designed eval power amplifier use pair LDMOS 1KW for modular broadcasting transmitters 1-20KW include digital pre-distortion DSP portion ENSCO, Inc, Melbourne, FL

Staff Project Engineer, March 2005 –Apr 2006

Ran a multi-functional team. Performed robust systems architecture down to the component level, generated specs. Maintained the project’s proposal, forecasting, staffing, budget, schedule, integration, and test plan. Executed architecture trade studies and HW/SW partitioning. Championed cost reduction. Supervised embedded, optical, analog ASIC, mechanical and PCB/flex layout. Led electronics lab. Metrology and Engineering Change System ECO to design for manufacturability (DFM) strategy. DO-160,-178B,-254. Prepared documentation for FCC/UL agencies.

Designed equipment to measurement thickness of oil on coating substance. Wavelength domain reflectrometry, infrared and visible arrays/sensors, low-level signal acquisition 16b base of TI microcontroller MSP430F4270 as frontend and PC/DSP algorithms as backend.

Designed multi wavelengths VCSEL lasers - GaSb-InAs PIN photo-detectors research system to characterization of surfaces 400-2300nm wavelength

Consultant, Oct 2001–March 2005

Generated projects quotes, budget, schedule, and test plan. Directed proposal development activities for each project, including a request for proposal review and analysis, bid determination, technical writing and editing, review of technical and business proposals. Performed systems architect down to the component level, generate specs. Made preparation and presentation of engineering concepts and data for internal design reviews and customers. Involve to FCC Part 15, and UL/CE approvals. Wrote VHDL and C codes. Done signal integrity analyzes: PSpice/ Hyperlynx/ ModelSimII/ MultuSim simulation. EMI-EMC issue. Hands-on.

Designed equipment 300-2400MHz bands ISM, Bluetooth, Zigbee, RFID applications. Slot, patch antennas. Testing using anechoic chamber

Designed GSM disposable 2 bands handset (Qualcomm chips sets) and car charger for China market

Designed digital control power supplies up to 1KW different configurations. Battery chargers Li-Ion/NiMH.

Designed voltage control negative resistance oscillator VCO on 4-7GHz band. Output level is +5dBm.

Designed RFID tag TX 0dBm for US/Japanese markets 303.875 and 433.92MHz bands. Present function, motion detecting and infrared (IrDA) sensors; micro controllers Microchip PIC12508 or TI MSP430F1101; bi-polar transistor colpitt SAW generator or RF transmitter MAX1472; F and patch PCB antenna; up to four years battery life.

Participated on tender for invasive cardiology equipment: low-level signal acquisition 16-256 expanded matrix channels amplifier, 20-24 bit sigma-delta ADC, FPGA as FIR/IIR filters, Monte Carlo method spread.

Designed hardware and firmware (Microchip controller PIC16C874) for C-17 aircraft maintenance trainer device of traffic alert/collision system

Designed RF generators and channelizers for CATV 7-806 MHz Emergency Alert System: audio-video circuits, oscillators, PLL, AGCs, attenuators, power combiners, prescalers, VCOs, mixers, upconverters – down converters, and monolithic amplifiers. Microchip controller PIC16C62A. Calculated passive filters.

Navini Networks, Inc, Plano, TX (Start-up)

Senior Digital Design Engineer, Sep 2000-Sep 2001

Involved in the design of WCDMA Base Station 802.11 with redundancy. Generated board’s specifications. Supervised PCB layout. Performed signal integrity analyses. Made PSpice simulation. Generated C/VHDL code. EMI/EMC/ ESD issues. 3 Professional Resume

Designed RF and digital back plane passive boards of BTS. Implemented Motorola GPS 1.5GHz modules to BTS. JTAG debug interface a chain. Designed test fixtures. Designed BTS Wire harness. Press-fit connectors.

Designed Heat Management Controller (HMC) boards with redundancy to maintain temperature inside of BTS zero to 70oC with outdoor temperature minus 40 to 85oC. Provided hot swap shot-down signal to digital and RF boards, power distributions a heaters and a fans: Philips microprocessor x51 OTP P87LPC762 and LPC767, temperature sensor DS1775 (I2C bus), two two-way opto-isolator channels for I2C, high current drivers BUK215.

Fujitsu Network Communications, Inc, Transmission Development Division, Richardson, TX Senior Consultant, Nov 1999-Aug 2000

Designed Fast Ethernet and Gigabit (fiber SONET OC-12) ATM/POS transport unit (main board: C-5 networks processor, two Fujitsu ASICs, two PHY 4x100 Base-T, two Micron memories SDRAM TC59S6432, MoSys pipelined-burst-SRAM MC805256K36 (9Mbit 256Kx36, 200MHz speed grade), IDT recovery circuits-PLLs clocks 100 and 150MHz 74FCT388915, LVDS drivers) and sub-board (Motorola PowerPC MPC8260, Tundra PCI bridge CA91L8260, four Micron SDRAM MT48LC8M16, boot flash 28F160S3, clocks 50 and 66MHz, CPLD XC95144, JTAG chain, In-Circuit Emulator (ICE), hot-swap controller and start-up sequences, hard/soft-ware trade off. Compact PCI connection. Supervised PCB layout.

UTOPIA L3 test boards for verification Fast Ethernet and Gigabit Ethernet units. Debug (fast down load) board: Ethernet 10/100 LXT971 chip, RS-232 driver, ATMEL 89C2051microcontroller OTP. Passive crossover and junction (bridge) boards. Loop-back board FPGA Virtex XCV200-6 with UTOPIA L3 protocol: transmit and receive clocks speed 100MHz. Wrote C, VHDL codes. Involved FCC and UL/CE approvals. NEC America, Inc, Wireless Engineering Division, Irving, TX Senior Hardware Design Engineer, Jan 1997-Oct 1999

Developed target boards CDMA handset Cellular (IS-95A/B) and PCS (J-STD-008) standards: Qualcomm CDMA: MSM (Mobile Station Modems), PMIC (Power Management), Xilinx FPGA Spartan serial, Flash-SRAM-Stacked MCP (Multi Chip Package) memories, RealTimeClock (RTC), display, DSP, codec, audio circuit, high efficiency low noise power supplies. EMI/EMC/ ESD issues.

Designed platform board for the ASIC development of CDMA phones: ARM7T processor 25 MHz, two Xilinx FPGA 4085, high speed SRAM

(4Mx32, 8ns), Flash (2Mx16, 70ns), DSP processors (TI 80MHz and NEC 66MHz), JTAG-Xchecker, Ethernet-USB-IrDA-UART-RS-232 interfaces, RTC, codec, audio, power supplies.

Designed accessories for NEC PY handset project included proposed product specifications: a Cigarette Lighter Adapter (CLA) and travel and top chargers for LI-Ion and NiMH/NiCd batteries. FCC, UL liaison agencies. Bird Electronic Corporation, Cleveland, OH

Design Engineer, Aug 1993-Nov 1996

Designed linear, nonlinear analog and digital circuits for handheld RF power meters: square, average, square-root, peak-detector for precision low level signal acquisition and conditioning, low noise amplifiers (LNA).

Calculated and designed passive filters, such as Butterworth, Chebyshev, Elliptic function to 2.4 GHz. Scientific-Research Institute of Digital Systems (Southern Ural State University), Chelyabinsk, Russia Senior Scientist /Team Leader, 1985-1992 susu.ac.ru, niics.ru

Designed core radars, sonars, and combat systems submarines.

Designed Industrial automation ultrasound laser-based system in hot metal-processing quality control.

Designed broadcasting radio-frequency equipment up to 30KW. Scientific-Research Institute of Measuring Equipment, Chelyabinsk, Russia Senior Staff Engineer/Team Leader, 1976-1985 meti.ru

Designed and developed methods and equipment for flight and ground control of aircraft navigation landing systems for spaceships, airplanes, helicopters, included landing to aircraft carriers and cruisers. RF design up to 40 GHz.

Designed complex equipment for location police vehicles: Base Stations and modem in vehicle.

Designed microprocessor-based portable Doppler speed detector for police force around 10GHz. Education

Ph.D. Electronics

(Radar Measurement Field), Nov 1984

Urals State University, Yekaterinburg, Russia www.urfu.ru MSEE Electronics Engineering

(Radio Electronic Systems Field), Feb 1976

Southern Ural State University, Chelyabinsk, Russia susu.ac.ru Certifications, Publications, Patents, and Personal

More than 40 published articles include seventeen inventions patented during 1978-87

Product certification in XILINX FPGA tools, Dallas, Texas, 1999

Attended numerous Mentor Graphics, Xilinx, Halliburton, NECAM Technical and Management Training courses

Former amateur radio operator/designer UA9BQ 1968-1992 US Citizen

DoD secret security clearance (2005-2007)

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