Design Engineer Engineering
Resume:
Stephan Rohlfing
Director
Profile
As a seasoned Director with a track record of over 30 years in RF and microwave design engineering, I have spearheaded the development of cutting-edge technologies across various organizations. My expertise lies in leading high-impact projects, overseeing MMIC development, and presenting technical solutions to stakeholders. I excel in designing power amplifiers, conducting simulations, and integrating complex RF systems. My career trajectory showcases a consistent commitment to innovation and driving successful outcomes in the field.
Employment History
Director at NR Labs US
September 2021 — September 2023
- Developed HB PA design for ODIN module
• Integrated and laid out ODIN module
• Conducted EM simulations for output matching
• Designed couplers for antenna switch
• Initiated new laminate design for ODIN module
Member of Technical Staff at RFMD/QORVO
August 2012 — August 2021
- Developed LNA and switch for QM76022 program
• Contributed to development of QM56028 Multi Band PA for 3 HB, 5 MB, and 5 LB frequency ranges
• Led HB PA design and complete laminate design
• Conducted DC, HB, and modulated simulations
• Integrated filtering for bands 8, 12/17, 13, 20, 26, 28A, and 28B Senior Member of Technical Staff at ITT/EXELIS Inc February 2009 — August 2012
- Led development of Ku band 2W T/R module for AESA radar
• Oversaw MMIC development and validation for T/R module
• Presented progress updates and final outcomes to upper management
• Integrated T/R modules into thin tile array
• Upgraded MTI reflector for ground-based radar calibration Electronic Design Principle Engineer at Skyworks Solutions June 2002 — October 2008
- Developed CDMA/CDMA2K FEM with interstage filter and duplexer
• Created output matching circuit and power detector design
• Designed Skyworks' first flip-chip amplifier and WCDMA PAM
• Shrunk product to 3mm2 package with 1st iteration design win
• Contributed to quad-band dual mode GSM/EDGE PAM with high PAE
Details
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Skills
RF and Microwave Design
Engineering
Project Leadership
MMIC Development
Power Amplifier Design
RF System Integration
Simulation
Technical Presentations
various roles at Conexant
January 1999 — May 2002
- Lead diverse projects across different departments
• Develop innovative solutions to optimize processes and workflows
• Collaborate with cross-functional teams to drive business objectives
• Streamline operations to increase efficiency and productivity
• Execute strategic initiatives to meet organizational goals Electronic Design Engineer Manager at Conexant
May 2001 — May 2002
- Developed PCS and cellular band CDMA/CDMA2K PAMs interfacing with a DC/DC converter for performance enhancements.
• Managed a team of three designers for NOKIA PAM and DC/DC converter design.
• Responsible for cell band PA design and phone board interface with DC/DC converter.
• Earned corporate Chairman Award for successful program.
• Enhanced performance of CDMA/CDMA2K PAMs and managed design team for NOKIA projects, earning corporate recognition. Manager of Applications at Conexant
May 2000 — May 2001
- Lead team of engineers and technicians for technical support
• Provide guidance to customers on product selection and use
• Identify market needs and propose new product ideas
• Generate application notes, design interface circuitry, review test data
• Support sales, marketing, and design engineering teams in technical matters.
Electronic Design Senior Staff Engineer at Conexant January 1999 — May 2000
- Lead program for Nokia Current Control PA development
• Design 3.0 Volt MMIC power amplifiers for cellular applications
• Present data and designs to customers for reviews
• Utilize computer simulation and CAD tools for circuit design
• Supervise device assembly and characterizationAs program lead at Conexant, I design 3.0 Volt MMIC power amplifiers for cellular applications, accommodating various modulation formats. I present designs to customers, utilize computer simulation and CAD tools for circuit design, and supervise device assembly and characterization to ensure accurate data acquisition. Electronic Design Engineer at Rockwell International January 1996 — December 1998
- Designed 5.0 Volt and 3.0 Volt MMIC power amplifiers using GaAs HBT technology
• Packaged amplifiers in plastic or MCM formats for cellular handset applications
• Supported optimization of phone layouts for TDMA, CDMA, and AMPS modulation
• Presented data and designs for customer reviews
• Supervised device assembly, analyzed data, and managed product phases to ensure compliance and maximize yield. Senior Design Engineer at Super Conductor Inc
October 1991 — January 1996
- Led a $500,000 contract developing a switched multiplexer for the Navy
• Designed filters, housings, and masks for the contract
• Developed Narrow Band Filters for STI's cellular programs
• Supported millimeter wave down converter contract, overseeing design, assembly, testing, and tuning
• Established procedures for machining, plating, and circuit mask generation
Design Engineer at Amplica Inc
August 1989 — June 1991
- Designed new Microwave Components and Power Amplifiers using CAE and CAD software tools.
• Established manufacturing procedures for new products and developed automated test setups to streamline processes.
• Supervised 5 Production and 2 Engineering Technicians to ensure efficient operations.
• Interfaced with customers to provide technical support, troubleshoot issues, and present innovative solutions.
• Researched and procured components from external suppliers and contributed to problem-solving in production crises. Design Engineer at Veritech Microwave Inc
October 1988 — June 1989
- Designed Ultra Wideband coplanar waveguide amplifiers
• Supervised 2 Engineering Technicians
• Developed Laser Seal process for hermetically sealing amplifiers
• Created device models for active and passive components
• Designed housings and fixtures using AutoCADAt Veritech Microwave Inc, I designed Ultra Wideband coplanar waveguide amplifiers, supervised 2 Engineering Technicians, and developed a Laser Seal process for hermetically sealing amplifiers. Additionally, I created device models for active and passive components and designed housings and fixtures using AutoCAD. Engineer-GaAs Amplifier Design at Siemens Microwave Semiconductor Corp
July 1984 — October 1988
- Design components and amplifier systems using Silicon and Gallium Arsenide technology
• Create 5watt linear power amplifier and C-band/Ku band power amplifiers for satellite communication systems
• Introduce engineering prototypes into production and oversee production phase
• Develop software for Intermodulation and AM to PM distortion measurements
• Utilize CAD software for modeling and refining designs; supervise Engineering Technician.
Education
Bachelor of Science in Electrical Engineering, Stevens Institute of Technology, Hoboken
May 1984
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