Electrical Engineer and Reliability Specialist
Resume:
Gregory R. Temmer, BSEE
Electrical Engineer
Sarasota, Florida 34231
*******@*****.***
OBJECTIVE
A position as an Electrical Engineer performing PCB layout using Altium, reliability engineer, product development engineer, power supply engineer, DC/DC converter designs, LTSpice circuit simulation, solving part obsolescence issues, performing EPSA’s, circuit & system troubleshooting. ELECTRICAL ENGINEERING SKILLS
• Reliability Engineering
• Electrical Part Stress Analysis (EPSA) & Single Event Effects Analysis (SEEA)
• Printed circuit board layout (PCB layout)
• Schematic design reviews & PCB design reviews
• Schematic capture
• Pspice & LTspice circuit simulation
• Signal integrity
• Analog circuit design
• Switch mode power supply design
• Testing
• Hands-on-experience
• Circuit & system troubleshooting
EXPERIENCE
• Staff Electronics Engineer – Bastion Technologies (10/2016 – 12/2023, 11/2024 – 12/2024, 5/2026 to present) Remotely performed Electrical Part Stress Analysis (EPSA), Single Event Effects Analysis (SEEA), SGEMP
(System Generated Electromagnetic Pulse) for NASA, JPL, Lockheed Martin, Boeing Millennium Space Systems for military & planetary spacecraft missions. Authored detailed technical reports to support engineering
& design decisions. Conducted EPSA reviews, schematic design reviews, & identified corrective actions for circuit deficiencies. Analysis, simulation with LTspice, Cadence PSPICE, MathCad, HyperLynx tools was performed.
• Senior Electrical Engineer/Contractor – Paragon, Denver, CO. (03/2024 – 10/2024) Remotely supported Northrop Grumman’s HALO (Habitation and Logistics Outpost) space program reviewing and authoring findings on worst-case analysis reports performed by sub-contractors.
• Electrical Engineer/Contractor – Cobham Aerospace, Prescott, AZ (02/2015 – 12/2015) Wrote engineering change requests (ECR), addressing electrical parts obsolescence issues for manufacturing & product support in FAA certified environment. Performed EMC testing with antennae & spectrum analyzer for emissions testing for delta product comparison testing using applicable DO-160 sections. Performed product testing using a variety of lab equipment for the applicable DO-160 sections for delta product comparison. Performed LED selection & Chroma meter testing to match chromaticity for Night Vision Goggles (NVG) product testing for NVG compatibility.
• Electrical Engineer/Contractor – Triad Engineering, Fort Collins, CO (07/2014 – 11/2014) Reverse engineered an electrical control product. Performed analog circuit design & circuit simulation for a linear regulator, proportional integral analog control (PI), & 4-20 mA output device. Page 2 of 4
• Electrical Engineer/Contractor – Ball Aerospace, Boulder, CO (03/2013 – 08/2013) Performed worst-case analysis (WCA) reviews by providing detailed critical review/comments on other people’s WCA. Performed schematic entry & PSPICE simulation of analog switching power supply using OrCAD/Cadence 16. Performed transformer testing & extraction of transformer parameters for PSPICE.
• Electrical Engineer/Contractor – Hach, Loveland, CO (11/2011 – 10/2012) Troubleshot an existing power supply design & identified design flaws. Re-design of power supplies for +3V,
+5V, +12V supply using LT1871 SEPIC converter using LTspice. Designed over-voltage protection circuitry with discrete components (resistors, transistors, zener, MOSFET). Designed LCD backlight driver using a constant current PWM driver topology. Worked with 4.2V Li-ion batteries & IC battery charger circuit. Schematic
& PCB layout was generated with Cadence Allegro for a 3” x 2.5” board (250 SMT components, 3 switching regulators). Wrote theory of operation for power supply system. Worked with firmware engineer in troubleshooting hardware/firmware/systems issues. Design, analysis, & simulation using LTSpice.
• Electrical Engineer/Contractor – LASP, Boulder, CO (01/2011 – 10/2011) Performed Electrical Part Stress Analysis (EPSA) using EEE-INST-002 requirements for NASA MAVEN Mars mission. Performed circuit simulation using LTspice as needed for EPSA. Wrote test procedure & performed laboratory testing & characterization of cryodiode board.
• Electrical Engineer/Contractor – Terumo, Ann Arbor, MI (09/2010 – 12/2010) Worked for a medical electronics company performing worst-case analysis (minimum/maximum) on Power Manager Board. Performed mathematical analysis for accuracy of temperature probe over temperature. Performed schematic review & component de-rating analysis. Participated in group design review meetings.
• Electrical Engineer/Contractor – L-3 Communications, Santa Rosa, CA (09/2009 – 05/2010) Performed PCB layout / re-layout for existing Power Board & Processor Board. Identified many poor implementations of capacitor de-coupling.
Performed schematic review & PCB layout review of 3 boards. Identified circuit design de-rating issues with design for resistors, capacitors, opto-isolators, LEDs. Performed PCB layout using Altium.
• Electrical Engineer/Contractor – Goodrich Aerospace, Albuquerque, NM (03/2008 – 03/2009) Performed single event upset (SEU) radiation analysis for voltage regulators for -5V, 3.3V, 1.5V. Identified circuit design flaws, proposed & simulated design changes to mitigate SEU. Analysis & simulation using LTSpice. Drawing system block diagrams using VISIO. Supporting preliminary design review (PDR). Performed schematic design reviews of controller & power supply boards. Wrote board level test procedure to test out analog/digital functionality of power supply board. Performed Worst case analysis on Controller Board using Mathcad.
• Electrical Engineer/Contractor – Honeywell, Glendale, AZ (02/2008 – 03/2008) Performed simulation & analysis of a 1553 data bus signal integrity. Performed Monte Carlo analysis of component tolerances. Analysis & simulation using LTSpice.
• Electrical Engineer/Contractor – Physical Optics, Torrance, CA (11/2007 – 01/2008) Performed PCB layout for high density USB radio transceiver for mixed signal analog/digital layout. Design had 916 MHz antenna & 2.45 GHz Antenna. Antenna keep out zones further reduced usable layout space making the PCB layout even more challenging.
Board specifications: 2.57 inch x 1.50 inch, 155 SMT components, double sided PCB, 10 layers, 1 ounce copper, 10 mil vias, 0.092” thickness. Performed PCB layout using Altium.
• Electrical Engineer/Contractor – NeoGuide Systems, Fort Collins, CO (09/2007 – 10/2007) Remotely tasked to review schematics, BOMs, fixed part number errors, fixed naming conventions for resistors
& capacitors on BOM, verified datasheets associated with each line item. Writing engineering change orders. Used Arena software for BOM changes.
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• Electrical Engineer/Contractor – Dako, Fort Collins, CO (05/2007 – 06/2007) Tasked to reduce the excessive radiated emissions problems on analog DC/DC card. Used spectrum analyzer and clamp-on current probe to identify common mode noise on power cable. Used ferrite bead to reduce common mode noise.
• Electrical Engineer/Contractor – Andreatta Engineering, Fort Collins, CO (06/2006 – 01/2007) Designed two radiation tolerant linear voltage regulators: 20V @ 5.5A, 24V @ 2.2A using discrete components only for a satellite mission. Linear regulator had following features: power enable, over-current protection, reverse voltage protection, virtual ground, virtual ground enable signal, & low off quiescent current. Wrote theory of operation. Design, analysis, & simulation using LTSpice.
• Electrical Engineer/Contractor – Dako, Fort Collins, CO (01/2006 – 07/2006) Troubleshot a high voltage flyback converter. Performed re-design of high voltage flyback converter using LT1737 that was digitally controllable with output voltage range of 120 VDC to 430 VDC, 30 W. Performed schematic entry with OrCAD. Wrote theory of operation for flyback converter.
• Electrical Engineer/Contractor – Woodward, Fort Collins, CO (10/2004 – 08/2005) Designed speed governor control board for high temperature environment of 125C and EMC compliance. Performed analog & digital, switch mode power supply circuit design for harsh marine engine application. Performed schematic entry & PCB layout using Mentor Expedition.
• Electrical Engineer – Decatur Electronics, Fort Collins, CO (05/2001 – 08/2004) Designed switch mode power supplies, re-design of police radar boards for upgrades. Performed sustaining engineering for police radar and video products. Re-design of existing products from leaded into SMT equivalents. Performed schematic entry & PCB layout using Protel / Altium.
• Electrical Engineer – URS, Boulder, CO (07/2000 – 05/2001) Performed complex testing, troubleshooting, & integration of RF electronics components for transmitter at 915 MHz & 1290 MHz weather doppler radar system.
Designed & tested RF pulse shaping circuit. Designed analog & digital circuitry for a battery backup/monitoring system. Schematics were generated with OrCAD. Performed PCB layout.
• Electrical Engineer – Lockheed Martin, Denver, CO (01/1995 – 01/2000) Designed electrical ground support test tools for flight electronics for NASA spacecraft missions for Mars 98, Mars 2001, Stardust, & Genesis spacecraft missions. Provided spacecraft test lab support for hardware & software integration activities. Performed testing & checkout of ground support electrical equipment. Performed schematic entry & test cable design using OrCAD.
• Laboratory Supervisor – Electro Corp, Sarasota, FL (02/1993 – 06/1994) Built & tested electrical prototypes. Testing magnetic, hall & proximity sensors. speed sensors using gear spin fixtures over distance. Testing included thermal chamber. EDUCATION
• Bachelor of Science in Electrical Engineering – University of South Florida, Tampa, FL. COMPUTER SKILLS
• LTspice, Cadence for schematic entry, Cadence PSPICE, Altium (schematic & PCB layout), MathCad, HyperLynx, Microsoft Office.
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ADDITIONAL AREAS OF STUDY / SEMINARS
• High Frequency Measurements & Noise in Electronic Systems Seminar (2012).
• International EMC Conference (2006).
• Antenna Theory Simplified (2005), Partitioning & Layout of Mixed-Signal PCBs (2005), Advanced Digital Design
& Signal Integrity (2005).
• Grounding & Shielding in Electronic Systems (2001).
• Circuit Board Layout to Reduce Noise & Emission and Susceptibility (2001). ACCOMPLISHMENTS
• Identified Single Event Transient (SET) events that caused electronics to shut down in circuit simulation & caused a non-recovery.
• 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 circuit design flaws of existing voltage regulator under radiation events.
• Designed an analog NTSC blue screen video detection circuit.
• Successfully designed & 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, with small voltage ripple on output.
• Successfully re-designed 3 SEPIC converters power supplies on first attempt with small voltage ripple on output.
• 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 issues, which caused software to hang. Resolved by increasing clock speed.
• Determined that potting material was causing circuit instability. PERSONAL REFERENCES
• References are available upon request.
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