Engineer Design

________________________ALEX STUHL, PhD_________________________

Dallas, TX *********@*****.*** 214-***-****

Summary

Twenty plus years experience leading multi-functional teams. Thirty plus years experience designing electronic equipment. Strong experience in measuring fields including radio frequency (RF), analog circuits, AD-DA conversions, DC-DC power conversion, diagnostics, FPGA, EMI/EMC, ESD, telecommunications, Gigabit Ethernet, microprocessors, optical, precision low-level signal acquisition, power supplies, RFID, signal integrity, simulation, systems, testing

Specialized Design Tools

PADS, Hyperlynx, ModelSim (Mentor Graphics)

OrCAD, Pspice, Concept (Cadence Design Systems)

Protel DXP and 99SE simulation and PCB (Altium)

PCAD (Altium)

Eagle (CADSoft)

Designer HFSS (Ansoft Corp)

Genesys, Sonnet (Agilient Tech)

Microwave Office AWRDE (AWR Corp)

FPGA-VHDL: (Xilinx, Altera)

C Complier (Keil, MicroChip -MPLab, High Tech)

Code Composer Studio IDE (Texas Instruments)

LabVIEW6.1, Multisim (National Instruments)

MatLab 6 (MathWorks)

Pro-Designer (LINOS Photonics)

AutoCAD LT (Autodesk)

DOORS (IBM)

Agile (Agile Technology)

MS Office, MS Visio, MS Project (Microsoft)

Experience

Clide Electronics, Inc, Dallas, TX

Staff Consultant, 2010 – present

Maintain projects proposal, quotes, budget, schedule, and test plan. Interfacing with suppliers and vendors. Signal integrity: PSpice simulation. MIL-STD-461E, DO-160, DO-254.

• Created data base for parts working temperature 225oC: test procedures and evaluation-test PCBs.

• Designed battery industrial/military applications for wireless sensor units network of chipsets 2.4GHz ISM band 802.11/802.15.4 including enhanced data rates to 2-11-150Mbps. PCB build-in patch microstrip antenna. ESD issue. Exchange battery monthly-yearly.

Halliburton Energy Services, Inc, Houston, TX

Senior Technical Adviser-Electronics, 2007–2010

Led the RF Group. Performed systems architecture down to the component level, generated specs and consideration documents. Executed robust architecture trade studies and HW/SW partitioning. Preparation and presentation of engineering concepts and data. Calculated RF link budget. Working temperate up to 180oC. PCB Taconic teflon TMS-30 clad and fastRice27 prepreg (IPC-2141). Design for manufacturability (DFM). Reliability testing HALT, HASS; MTBF calculations.

• 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), switchable / variable gain RF power amplifiers up to 33dBm (Freescale), RF digital step attenuators 5bit (Peregrine Semi). Microcontroller circuit Microchip, DAC-ADC (Analog Device) 14bit 25Msps for each channel. Low noise DC-DC converters. 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.

Continental Electronics Corp, Dallas, TX

Principal Project Engineer, 2006–2007

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. 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 transmitters 1 and 2 Megawatts for Brookhaven National laboratory/US dept of energy.

• Designed low noise power supplies with sequence. Heavy passive filters simulations.

ENSCO, Inc, Melbourne, FL

Staff Project Engineer, 2005 –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 front end and PC/DSP algorithms as back end.

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

Clide, LTD, Dallas, TX

Staff Consultant, 2001–2005

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. Performed design PCB layout using Mentor Graphics, Protel and Cadence tools (IPC-2141 standard). Involve to FCC Part 15, and UL/CE approvals. Wrote VHDL and C codes. Done signal integrity analyzes: PSpice/ Hyperlynx/ ModelSimII/ MultuSim simulation. Hands-on

• Designed equipment 300-2400MHz bands ISM, Bluetooth, Zigbee, RFID applications. Slot, patch antennas.

• Designed power supplies 1-400 watts include isolated flyback converters and Li-Ion/NiMH chargers.

• Designed frequency synthesizer 2.245GHz: carrier 24.86875MHz and reference 104.4MHz. Peregrine-Semi integer-N PLL PE3236. Performance better than SSB phase noise minus 130dBm from 10KHz offset.

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

• 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 DO-254/178B.

• 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.

• Designed “smart” power supplies Unit: -48V input, three DC-DC converters +5V/20A, +-12V/3A, Siemens CPU, Real Time Clock, memories (flash, SRAM, SDRAM) Xilinx CPLD, temp sensor, current sensors, RS232 port.

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

Senior Digital Design Engineer, 2000-2001

Involved in the design of WCDMA Base Station 802.16e WiMAX (OFDM) with redundancy. Generated board’s specifications. Supervised PCB layout. Performed signal integrity analyses. Made PSpice simulation. Generated C/VHDL code.

• 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. EMI/EMC ESD issues.

• 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, 1999-2000

• 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, 1997-1999

• 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 Startan serial, Flash-SRAM-Stacked MCP (Multi Chip Package) memories, RealTimeClock (RTC), display, DSP, codec, audio circuit, high efficiency low noise power supplies.

• 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, 1993-1996

• 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.

Southern Ural State University, Chelyabinsk, Russia

Senior Scientist /Team Leader, 1985-1992

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

• Designed broadcasting and military radio-frequency equipment up to 30KW and 6GHz.

Research Institute of Measuring Equipment, Chelyabinsk, Russia

Senior Staff Engineer/Team Leader, 1976-1985

• Designed and developed methods and equipment for flight and ground control of aircraft 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)

Urals State University, Yekaterinburg, Russia

M.S. Electronics Engineering

(Radio Electronic Systems Field)

Southern Ural State University, Chelyabinsk, Russia

Certifications, Publications, Patents, and Personal

• More than 40 published articles include eighteen inventions patented

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

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

US Citizen

DoD secret security clearance

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