System Design Circuit

Charley Lee 626-***-****) **** Bartlett Ave. Rosemead, CA 91770

Summary of Skills: Email: *********@*****.***

Possesses a passion from hardware circuit design to system design, new product development and innovation with extensive experience in Analog/Digital/ RF/Microwave hardware circuit and system design, also including RFID Antenna design and microstrip filter design, define modules specifications with required documentation, develop testing setup and required documents.

oCompleted a high performance state of the art the real AGC-automatic gain control RF amplifier design, which can provide over 70dB dynamic range by designing 3 active consecutive feedback control loops with low cost pin diodes attenuator. Wideband multi-channel down converter design and single channel up converter design.

oCompleted Up/Down converter design, EMC/RFI testing, diagnostic / troubleshooting and filtering design with total solutions to match system requirements. My passion is from hardware circuit design to system design and innovation.

oFocused on transmitter, receiver, and high efficiency antenna design from 13.56MHz—915MHz/ 2.4GHz (RFID-Transceivers)--GPS-WiFi-Bluetooth antenna and LNA to 5.8GHz ISM band, microwave 1.2 GHZ-23GHZ telecommunications (T1, DS1, DS3, QAM), and successfully developed Tx/Rx of 26-28GHZ system design for OC3 - OC12 wideband data application, also including high efficiency wearable antenna for medical device --- suitable for new generation wireless implantable system.

oWorked on projects (Design mixed-signal Analog/digital/ RF amplifier with AGC and filter circuit design/ 10MHz to 44 GHz also up to W-Band (82GHz and 91GHz) and Digital circuit design with FPGA Xilinx Technology) from concept to complete product, including manufacturing process development and reliability thermal cycle testing.

An excellent Analog/Digital/RF/Microwave/NFC product development engineer and willing to work with a team to develop and design a revolutionary product.

Excels in high IP3 low noise linear amplifier and AGC close loop design, including design: AFC, VCO, DRO, RF magnetic coils, RF modules, active and passive filters, microstrip filters, EMI/RFI filters, antenna design and matching circuits design, switching mode power supply and DC to DC converter design.

oLow phase noise phase locked loop oscillators-- PLL circuit design for the motor control/polygon mirror.

Strong analytical skills and capable of working closely with software engineers on RF auto adjustment algorithms for transmitting power control and modulation index control.

Understands customers’ technical/business challenges and provides hands-on, expert-level technical assistance and support to the customers and their technical inquiries.

Experienced in root analysis of component failures/circuit design issues and possesses confidence in problem resolution.

Experienced in building critical circuits for quick testing to prove the correct concept, PCB layout, and setup the project time schedule, documentations for schematics, parts list, theory of operations as well as designed automatic test fixtures to help production to have high yield rate.

Practical experience on RF hardware design and RF transceiver testing validation / development

oExperience in handling the entire transmitter and receiver project design (HF, VHF, UHF, and Microwave-26GHZ-28GHZ System design), and establishing a system level of specification, system block diagram, system parameter calculation / path loss and LOS analysis, test plans and documentation, transition to manufacturing as well as system testing/interact with customers to meet their requirements.

oFamiliar with software simulator such as Touchstone, AWR (Microwave Office), ADS, Eagleware, Computer simulation Technology--CST, Or-cad / P-cad (schematic drawing).

The following experience shows design and testing ability in a variety of Digital/Analog/RF/Microwave circuits/Antenna, wireless communication system, 16QAM (1.2GHz-10GHZ) radio system, RFID 13.56MHZ/ 915MHZ/2.4GHZ system, WiFi, GPS, Bluetooth Antennas, Low noise front-end amplifier and Microwave Telecommunications (18GHZ-23GHZ) point to point system ( M12 board digital circuit design, T1, DS1, DS3,QAM ). Completed design TV stereo Aural Modulation Monitor (from Channel 2 to Channel 81) and Cable TV- 52 Channels RF converter from UHF (571.25 MNZ to 913.75 MHZ) to VHF channels. This also includes design testing fixtures to help production line to have a 1 million volume per year.

Education: MS Electronic Engineering, Pacific States University, 1984

Professional Experience:

Raytheon Corp. Space and Airborne Systems July 2020 to July 2023

Contractor (1 year) converted to Full time (2 years) – Principal RF/Microwave Engineer

Working at STEM project for 3 years, involved in testing RF/Microwave transmitter and receiver modules, RFA(RF Amplifier), LOA, DWFG, including debug and tuning hardware circuits with wire bonding on isolator around 10GHz power amplifiers, Distribution amplifiers, Up/down converter and multiplier frequency Generator, Verification testing of high density digital & RF circuit card assemblies, Redline testing procedures, temperature cycle testing, and analysis test data issues and create test data reports for the team review.

I have been actively involved in the integration and testing of system-based RF modules, verifying functionality, performance, and reliability according to project specifications.

Northrop Grumman Corp. Feb. 2019 to July 2020

Contractor - Senior RF Microwave Design/Testing Engineer

Involved in JPSS ATMS Receiver Subsystem Project. Testing waveguide modules of microwave frequency multiplier, DRO (41.375GHz/45GHz) with multiplier up to 82.75GHz/91GHz and PLO 14GHz (Phase Lock Loop Oscillator), Amplifier with detector, External Harmonic Mixer of K-Band, V-Band, and W-Band. Detail Thermal / Vibration testing and analysis. Also including overall system analysis, system integration/testing. Present analysis and test reports to the team.

In my role, I have encountered and resolved challenges related to system implementation,

demonstrating my ability to troubleshoot issues effectively and ensure optimal functionality of RF

modules.

Secura Key Inc. November 2016 – Feb. 2019

Senior RF Consultant Engineer

Involved in developing and design the antenna for 13.56MHZ, 915MHZ, and 2.4GHZ RFID Readers and system integration/testing. Designed a unique state-of-the-art low cost high efficiency antenna for high frequency transmitter/receiver RFID system in which United States Patent application has been filed. Also solved PCB level and RFID system EMI/EMC related issues.

I have collaborated with cross-functional teams, including design engineers, manufacturing

personnel, and quality assurance teams, to streamline the system integration process and achieve

project objectives.

Daqri LLC

Principal RF Design Engineer May 2015 – Oct. 2016

First project--- validation and design GPS-WiFi-Bluetooth antenna, low noise amplifier/filter, and also provide testing setup---including detail testing procedures.

Second project --- Involved in developing and design the holographic video monitor with acousto-optic modulator project. Created the UHF system block diagram and then designed up converter, LPF/BPF, mixer, VCO, splitter, amplifiers, a special phase-locked loop (PLL) for the motor control/polygon mirror/18 channels waveguide lithium niobate/ Galvanometer application to produce the video image.

Third project--- involved in developing and design ground and wall penetrating radar (GPR) project.

oThis GPR is a near-zone electromagnetic radar system will be used to detect/locate/ identify and image subsurface objects. By using UWB (Ultra-wide band) technologies, designed a short impulse to create a very wide RF bandwidth and designed a control circuit to select the different PRF (Pulse repetition frequency) to test the image resolution, designed low noise amplifiers/matching circuit and also designed the wideband antenna (From UHF to 5.8GHZ with CST RF simulation tool) for both transmitter and receiver.

Secura Key Inc. November 2011 – May 2015

Senior RF Consultant Engineer

Involved in developing and design the Antenna for 13.56MHZ and 915MHZ RFID Readers (UHF Up Converter / Down Converter module for RFID Transmitter and Receiver) also including overall system analysis, system design and system integration/testing.

Lucix Corp. May 2010 – October 2011

RF Testing/Design Engineer for Satellite Communication System

Working in a clean-room

Involved in 44GHZ down converter to 21GHZ circuit testing, 21GHz combline bandpass filter (prepare testing procedures), microstrip filters design, amplifier splitters (output 7ports), 12.7 GHZ temperature compensated dielectric resonant oscillator (DRO) design, K band AGC amplifier development and design as well as modifying the old design to get better performance to pass all military standard temperature cycle testing.

Vivotech Inc. June 2007 – August 2008

Senior RF Design Engineer (RFID Projects)

Involved in developing the 13.56 MHZ Antenna, amplifiers, filters and matching networks design for RFID Readers Projects and System Integration/testing.

Completed many different kinds of 13.56MHZ high efficiency Antenna design (including flexible membrane antenna and PCB inlayer antenna) with transceiver integrated circuit and low cost discrete amplifier module design that all passed the FCC and CE tests.

Set up complex RF measurement equipment for test purposes. Solved all kinds of ISO–FIME issues and PCB level/module level of EMI/EMC related issues.

Secura Key Inc. August 2002 – March 2006

Senior RF Design Engineer (RFID Projects)

Involved in developing the 13.56MHZ and 915MHZ RFID Readers (Transmitter and Receiver) and overall system Integration/testing. I completed many different kinds of high efficiency Antenna design with transceiver integrated circuit that all passed the FCC and CE tests.

Completed a high power Reader design with State-of-the-art discrete components which includes both high power transmitter and high sensitivity receiver (design low cost low noise figure front end amplifier and active filters use the innovative programmable analog integrated circuit).

oIncluding high volume production failure analysis, recommended changes magnetic coil circuitry and test procedures to improve reliability and cost reduction as well as solved all kinds of EMI/EMC related issues.

Research Development Lab March 2000 – July 2002

Senior RF/ Microwave Design Engineer: (USAF Project)

Involved in developing the 26GHZ / 28 GHZ Transmitter / Receiver and Antenna for OC3, 10 /100 Base-T and OC12 wireless wideband data system. Establish a system level of specification, system block diagram, system parameter calculation / path loss and LOS analysis, test plans and documentation, transition to manufacturing, as well as system testing/interact with customers to meet their requirement.

Designed the compact size low-cost DRO(13.4GHz), Subharmonic pumped Mixer, Low Noise Amplifier (wire bonding) Transmitter power amplifier with AGC (PIN diode attenuator). Finline to Microstrip MMIC chip Transition and the Microstrip Low pass filter, Delay line FM Discriminator, Low cost baseband amplifiers.

oIncluding the overall system performance analysis, system design and system integration, and point to point transceiver of the video/audio multi-function system field testing and designed transimpedance amplifiers for photonics application.

JYH-KUEN Industry 1995-1999

Project Engineer

Involved in developing the industrial digital timer, digital counter, and the temperature controller with RF module (VHF narrow bandwidth FM type transmitter and receiver) for data communication. Switching mode power supplies and DC to DC converters, including design the automatic test fixtures with many kinds of Analog and Digital circuits.

Microwave Networks (Point to Point Telecommunications) 1990-1994

Senior RF/Analog / Digital Design Engineer

Involved in developing the 16QAM project, Digital Microwave Radio Telecommunications and the System Integration (1.2 GHZ and 10 GHZ with DS1/DS3).

Completed 5 mainly significant design projects:

oThe low cost high performance wideband linear I.F.strip amplifier provide 70 DB dynamic range with automatic gain control (AGC).

oLow cost band pass filters and PCB microstrip filter design.

oThe intelligent automatic frequency control (AFC) design for 18GHz and 23GHz Digital Transmitter/Receiver at working temperature from -40 C to +80 C.

oClose loop wideband slop equalizer for QAM project.

oThe M12 digital circuit design / Interface board (T1) with the state-of-the-art Digital FPGA Xilinx Technology and the automatic testing fixture for the Norton Telecommunication Project.

Telxon Corporation (Land Mobile Radio) 1988-1990

Senior RF Test Engineer

Involved in developing the RF module (400 MHZ TO 470 MHZ narrow bandwidth FM type transmitter and receiver) test setup, modify design for increase the receiver sensitivity, and analyzing and solving the test problems related with the data communication system.

Improvements made to tune 80 radios with about 98% confidence during an 8 hour day compared to 25 radios with 50% confidence using prior set up Translated to 6 workdays’ savings per 100 radios while increasing reliability.

Eaton Corporation 1987-1989

Senior RF Design Engineer

Involved in the spectrum analyzer project, including RF circuit design, phase locked loop oscillator design, VCO design, all kinds of filters with lumped and distributed elements, and logarithmic amplifier. Completed a 90 DB dynamic range logarithmic amplifier design.

Completed the reference generator design by using the combination of the automatic gain control (AGC) with phase locked loop (PLL) circuits design at working temperature from -40 C to +80 C.

Time Frequency Technology, Inc. 1984-1986

Senior Analog/ RF Design Engineer

Involved in developing state-of-the-art electronic analog, digital and linear circuit designs including hardware and software system integration.

oCircuits design included the RF phase locked loop oscillator, front-end amplifier, RF passive filter (L.P.F., H.P.F., B.P.F.), replace the high cost saw filters, I.F. amplifiers, low frequency active filter, active frequency doubler, PCB layout, and baseband demodulator.

Completed two significant design projects: TV stereo Aural Modulation Monitor (from Channel 2 to Channel 81) and Super Narrow Band STL FM type receiver, including all the RF/IF/Audio circuits and the automatic switching circuitry.

General Instrument Company (Wide band CATV Converter) 1975-1982

Electronic Design Engineer (cost effective designs for high volume production):

Involved in Cable TV converters development, including analog and digital circuit design, PCB layout, Passive filters, RF amplifier, voltage control oscillator, and double balanced mixer.

Band separate amplifier and MATV circuit design. Most of them belonged to VHF and or UHF products, and RF modules, including digital control circuit design for the automatic testing fixtures to help production people to get high yield rate.

Completed 2 mainly significant design projects: Single Channel Down Converter from UHF Band to VHF band and the wide band cable TV- 52 Channels RF converter from UHF (571.25 MNZ to 913.75 MHZ) to VHF channels, designed testing fixtures to help production line to have a 1 million volume per year.

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