Engineer Design Development Management Engineering resume in Los Angeles, CA

Ching-Lang Lin
(US Citizen)
Email: ndot04@r.postjobfree.com
Cell#: (949) ***-****
**** ******** *****, ****** ** 92604

OBJECTIVE:
RF Engineer (SP4161)

EXPERIENCE:
RF Design Engineer, Actiontec Electronics, Inc., Sunnyvale, CA, 7/2007 – 11/2011
Worked on Wireless LAN 802.11n/g/a AP Router Products Engineering Development –Integration, Test, Debug, Validation, Evaluation and Problem Solver, with RF, HW and SW groups
L2/L3 Performance Test using 1xCharios and IXIA:
Achieved Performance Test using 1xChariot, IXIA, and network analyzers -- Sniffer, EtherPeek, OmniPeek, Wireshark, with Good Knowledge security features 802.11i -- WEP, WPA-TKIP/WPA2-AES, WPA/WPA2-PSK, and WPA/WPA2-Enterprise, and Authentication protocols -- EAP, PEAP, 802.1x, and RADIUS, and Networking Applications -- STP, NTP, DNS, SNMP, SSH, TFTP, HTTP, and Network protocol TCP/IP
Evaluation, Design and Development in RF Driver
Knowledge of Shell Scripting/C/C++ languages
Achieved working with Firmware/Software Engineers using SU-600 Flash Programmer (Lead Electronic Co.) and TOP max II Universal Programmer (EE Tools) with FW and SW Engineers for Improving and Debugging
RF/Wireless LAN (WiFi) Communications Expertise: (Used VeriWave)
Achieved implementing 2.4 and 5.9 GHz Microstrip-Lifted-on-Air, Patch-on-PCB and PIFA Antennas MIMO 2x2 and 3x3 Array deploying around Mini PC board to investigate their Capacity in Anechoic Chamber for WiFi-LTE AP Routers that identified appropriate array position making a success in internal antennas
Achieved using Strip-Line for Matching Networks between Antenna Connector and Transceiver out port that simplified engineering and reduced cost
Achieved implementing Double Stub Tuner for CMOS-Switch Matching Network amid HPA, LNA and Antenna that maintained system stability
Achieved applying BPF (3 stubs & 3 capacitors) that improved insertion loss (S12) within 2 dB (from 8 dB) that solved company’s long term bad performance of system
Achieved investigating specifications of Diplexer [between WAN (975 – 1025 MHz) and LAN (1125 – 1525 MHz) for MoCA] that is a guaranty for QC
Achieved developing WLAN 802.11n/g/a Products, RF PCB Layout as well
- Achieved investigating the WiFi-CMOS-Single-Chip Characteristics: Transmit Power, EVM, Power Variation, Receiver Sensitivity, and Dynamic Range in using HP 4407B Spectrum Analyzer, and LitePoint IQ View
- Using HP 8753D Network Analyzer achieved investigating VSWR, Return Loss (Pass Band S11), Insertion Loss (Pass Band S12 ), and Rejection (Stop Band S12)
- Achieved working with Layout Engineers for RF’s PCB Layout to reduce EMC, EMI and SPUR Interference.
Achieved evaluating Wireless Capacity Tests in ATHEROS and BROADCOM WiFi Chips Executed Capacity (Rate vs. Path Loss) Investigated using Chariot in Anechoic Radioactive Chambers, and test design and implementation
- Achieved Capacity Investigated using Chariot in Azimuth conductive (a test with coaxial cable inside box-shielded, not including antenna factor)
- Achieved Throughputs vs. Packet Size Investigated using VeriWave Simulation Conductive
MoCA Digital Communications Expertise: (Used IXIA)
Achieved MoCA Clink’s Throughputs Tests figuring out Cyclic Prefix Length Processing Procedure, CPU Utilization between Ethernet and MoCA Drivers, Clink Control Algorithms, Clink Physical Layer, Clink Traffic Management and Clink Key Performance Parameters
Integration:
- Achieved designs and modifications on analog and digital circuits, Mixers, DC-DC converters, Amplifiers, Band/High/Low pass filters, Voltage-Reference circuits, Regulators, Oscillators, Comparators, Bias Circuits and Power Management
Debugging, and Problems Solver:
- Achieved problems solving and system debugging – Skills as below:
Identified test failure trends in the AP test failures, isolated root cause, analyzed root Cause, defined the Root Cause’s solution, then implemented the solution to improve AP products
- Achieved performing analyses on test data sets, and released documentation to resolve problems
Validation and Optimization in RF systems
According to Throughputs, TSSI and RSSI acquired below, to validate RF Systems and obtain a direction to optimize RF performance:
- Achieved Wireless Capacity (Throughput vs. Path Loss) Investigated using Chariot in anechoic Radioactive Chambers
- Achieved Wireless Capacity Investigated using Chariot in Azimuth conductive (a test with coaxial cable inside box-shielded, not including antenna factor)
- Achieved Throughputs vs. Packet Size Investigated using VeriWave simulation (a conductive test) to validate RF FW Driver, SW Platform as well
LTE:
- Achieved tests on 4G LTE-WiFi Mesh Router for Verizon Wireless
- Achieved estimating 750 MHz 6 dBi Dipole Antenna Specification with Verizon LTE Cellular Networks and LG 3G LTE Cellular Phones and Antenna Companies
Work with Cross-Functional Teams - Skills and Capabilities:
Achieved Analyzing Test Data including Abnormal data, for Accuracy and Quality Products to meet Performance Requirements of Customers
- Based on my Expertise-above, Experience and Knowledge with Abnormal data and Data Model to Decide Debugging and Improving (Performance) Directions for Software and Hardware Teams
OTHERS:
Achieved providing technical direction, acting as technical lead, to HW and SW members
Achieved providing technical support to Field and Application Engineers
Achieved working with cross-functional Teams
Achieved using “Gerber” files to modify circuits, or to change components (alternative parts)

Senior RF Engineer, Accton Technology, San Jose, CA & Taiwan, 10/2003 – 8/2006
Worked on WLAN 802.11a/b/g in Digital Beamforming development for outdoor, indoor applications of AP
Digital Beam Forming for Multi-Beam/MIMO in 802.11n development
Achieved Digital Beamforming Algorithm
Achieved Providing Integrating Atheros Chipset AR5513 + Two AR5112 for trials of two antennas and its algorithm development in a basis of receive combining, transmit beam-forming, and adaptive antenna in space diversity implementation
Achieved providing specifications of NF, IIP2, IIP3, LO Phase Noise
Patents Certified:
Wireless Network Apparatus And Adaptive Digital Beamforming Method Thereof
WLAN Auto-test Methodology

Research Engineer, Georgia Institute of Technology, Atlanta, GA, 7/2001 – 9/2002
Worked on Direct Conversion (Zero-IF) Receiver Development/Design for WLAN/WCDMA, using ADS/MATLAB for Simulation/Analysis.
Paper: Harmonic Boosting for High Performance Mixers, Published in IEEE-MTT-S and Transaction in June 2002
Achieved Harmonic Boosting Techniques for Zero-IF (Direct Conversion) Transceiver
Patent pending: DC-Offset Free Direct Conversion Receiver

RF Design Engineer, Texas Instruments, Inc., Dallas, TX, 8/2000 – 6/2001 (Closed)
Worked on Direct Conversion (Zero-IF) Receiver Chipset Development/Design for WCDMA Handsets, using ADS/MATLAB for Simulation/Analysis.
Designed Digital Transceiver Architecture for WCDMA/GSM
Achieved designing and developing a Direct Conversion (Zero-IF) receiver in chipset for WCDMA handsets, using ADS/MATLAB for Simulation and Analysis
Achieved developing NF, IIP2, IIP3 System Specifications
Achieved developing DC Offset Removed Scheme
Achieved developing AGC Distribution and Control Scheme between Analog Base Band and Front-End LNA
Achieved developing I/Q Imbalance Modeling
Achieved Evaluating Second and Third Order Distortions
Achieved LO/Transmitter Leakage Analysis

Senior RF Engineer, InterDigital Comm., Corp., Melville, NY, 9/1999 – 7/2000
Worked on Transmitter Development for WCDMA TDD/FDD Base Station, using ADS/MATLAB for Simulation/Analysis.
- Achieved evaluating Peak Power to Average Power Ratio
- Achieved Developing RF Impairment Model in SPW

Senior RF Engineer, LG InfoComm, Inc. San Diego, CA, 7/1997 – 8/1999 (Closed)
Worked on IS-95 Dual Band Dual Mode CDMA/AMPS Handset Engineering Development
- Achieved designing IS-95 CAMA Handset
- Achieved installing IS-95 CDMA Networks – 15 Cell Sites with one MSC in Las Vegas NV
- Achieved working on cdma-2000 attending 3GPP2 Meeting.

EDUCATION:
PhD Candidate in EE: Southern Methodist University, Dallas, TX
MS in EE: Polytechnic University, Brooklyn, NY
BS in EE: National Taiwan Ocean University, Taiwan

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