Electrical Engineer Design

GREG R. TEMMER, BSEE

**** ***** **** **** ******* / Colorado 80525 / 970-***-****

*******@*****.***

Electrical Engineer

• ANALOG CIRCUIT DESIGN

• SIGNAL INTEGRITY

• SCHEMATIC CAPTURE

• SPICE CIRCUIT SIMULATION

• SCHEMATIC DESIGN REVIEWS & PCB DESIGN REVIEWS

• PRINTED CIRCUIT BOARD LAYOUT

• SWITCH MODE POWER SUPPLY DESIGN

• TESTING

• HANDS-ON-EXPERIENCE

• CIRCUIT & SYSTEM TROUBLESHOOTING

• C++ beginner (self study for the past 5 months)

• Arduino beginner (self study for past month using SparkFun RedBoard)

Analog Circuit Design & Switch Mode Power Supply Design Expertise

• Switch mode power supply design – Buck, Boost, SEPIC, Flyback.

• Analog Power Supply Design – linear regulator with discrete components.

• Circuit analysis expertise, trade-offs, reliability.

• General use of operational amplifiers.

• Analog circuit simulation – SPICE.

• Power Management.

• High temperature circuit design.

• Low noise designs. High-speed design skills.

• FMEA & component de-rating analysis.

Signal Integrity Expertise

• Electromagnetic compatibility EMC.

• EMI / EMC.

• High speed design skills.

• Mitigation of system noise issues.

• Grounding / shielding of electronics systems.

• Signal integrity analysis and design.

• Design reviews of both schematic and printed circuit board layout.

Printed Circuit Board Layout

• Designed / layout of 31 PCBs. Protel / Altium software for layout.

• Board level design & footprint creation.

• Design noise free PCBs.

• Design for signal integrity, manufacturability.

• Layout for High & Low speed.

Electrical & Printed Circuit Board Layout Design Reviews Expertise

• Design reviews for schematics.

• Finding component de-rating issues & capacitor de-coupling issues.

• Design reviews for printed circuit boards. Finding layout issues.

Testing

• Use of general lab test equipment ( oscilloscopes, function generator, power supply)

• Use of specialized test equipment (spectrum analyzer, signal generator, programmable

loads, network analyzer, femto-ammeter)

Greg Temmer Page 2 of 3

Accomplishments

Developed high current over-voltage protection circuitry with discrete components

(resistors, transistors, zener, MOSFET).

Identified transient voltage dropouts due to inrush current issues which effected

system power on.

Designed a high current, linear power regulator using only discrete components.

Identified System improvements for existing designs.

Identified reliability improvements for existing designs.

Recognized circuit design de-rating issues with existing designs.

Identified circuit design flaws of existing voltage regulator under radiation events.

Designed an analog NTSC blue screen video detection circuit.

Successfully designed and performed layout on 31 printed circuit boards. All circuit

board designs worked on first power on.

Successfully designed / implemented / PCB layout of 5 National switcher regulator

power supplies on first attempt. Low noise designs.

Successfully re-designed 3 SEPIC converters supplies on first attempt. Low noise

designs.

Identified existing PCB noise issues due to layout, which led to re-layout and resulted

in a low noise design.

Troubleshot and resolved non-functioning existing circuitry designed by other

people.

Identified system clock issue which caused software to hang. Resolved by increasing

clock speed.

Work History

Temmer Engineering Electrical Engineer / Consultant Jan 2006 to present

Analog circuit design, power management, thermal management, power supply design.

Component selection (MOSFET’s, diodes, inductors, capacitors, resistors, fuses).

Schematic entry.

Schematic design reviews / PCB Layout Review.

Circuit Simulation using SPICE.

Prototyping & testing of circuits with general lab test equipment.

Troubleshooting & solving individual PCB’s & system issues.

Battery Charger circuit for 4.2V Li-ion batteries & battery charger circuit.

Design of radiation tolerant linear voltage regulator. 20V @ 5.5A, 24V @ 2.2A.

Design of digitally controllable high voltage ( 120 VDC to 430 VDC) 30 Watt flyback converter.

Troubleshooting existing power supply design. Identified design flaws. Power supply

re- design/design for 3V, 5V, 12V supply using LT1871 SEPIC converter. Simulation using LTspice.

LCD backlight driver design using a constant current PWM driver topology.

Developed over-voltage protection circuitry with discrete components (resistors, transistors,

zener, MOSFET).

PCB review accomplishments: Found many poor implementations of capacitor de-coupling.

PCB layout for extremely high density USB radio transceiver PCB specs: 2.57” x 1.50”,

155 SMT components, double sided PCB, 10 layers, 1 ounce copper, 10 mil vias, 0.092” thickness.

Reduced excessive radiated emissions problems on analog DC/DC card.

Successfully worked with firmware engineers in troubleshooting hardware/firmware/system issues.

Wrote test procedures.

Circuit Stress Analysis using EEE-INST-002.

Greg Temmer Page 3 of 3

Woodward, Fort Collins, CO Design Engineer/Contract Oct 2004 to Aug 2005

High temperature analog/digital industrial circuit design (125C).

Testing of prototype with o-scope, function generator, mutlimeter.

Industrial analog/digital circuit design for harsh marine engine applications.

Power supply design, low noise analog/digital design, PCB layout.

Use of magnetic sensors as potentiometers and non-contact switches.

Design for EMC compliance (EFT, surge, radiated emissions, immunity).

Decatur Electronics, Fort Collins, CO Design Engineer May 2001 to Aug 2004

Analog/digital design of police radar products. Testing of engineering prototypes with

o-scope, power supply, multimeter.

Interfacing with Analog Devices DSP and Microchip hardware.

PCB layout: footprint creation, SMT and leaded, ground planes, and EMI resistant boards

using Protel / Altium.

Power supply design, switch mode power supply.

Noise Reduction and Suppression: Used good layout principles, manual component

placement and routing for signal integrity and to reduce emissions.

Converted boards into SMT equivalents (sustaining / new product development).

URS, Boulder, CO Electrical Engineer July 2000 to May 2001

Analog and digital design, prototyping RF circuits, test, PCB layout of a pulse shaping

circuit, battery backup / monitoring.

Performed complex testing, troubleshooting, and integration of RF electronic components

and system (IF @ 60 MHz, Tx @ 915 or 1290 MHz).

Lockheed Martin, Denver, CO Electrical Engineer Jan 1995 to Jan 2000

Designed test tools for flight electronics. OrCAD for schematic entry.

Ground support for NASA spacecraft missions.

Test of the Test Equipment using oscilloscope, function generator, power supply, and multimeter.

Electro Corp, Sarasota, FL Lab Supervisor Feb 1993 to Jun 1994

Built prototypes; tested magnetic, hall, and proximity sensors; Thermal testing of

sensors; Managed R&D lab.

Education

Bachelor of Science in Electrical Engineering, University of South Florida, Tampa, FL.

Additional Areas of Study/Seminars

High Frequency Measurements and Noise in Electronic Systems Seminar (2012)

International EMC Conference (2006)

Antenna Theory Simplified (2005), Partitioning and Layout of Mixed-Signal PCBs

(2005), Advanced Digital Design and Signal Integrity (2005)

Grounding and Shielding in Electronic Systems (2001)

Circuit Board Layout to Reduce Noise and Emission and Susceptibility (2001)

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