Ching-Lang Lin

(US Citizen)

Email: acb1ib@r.postjobfree.com

Cell#: 949-***-****

**** ******** *****, ****** ** 92604

OBJECTIVE:

EXPERIENCE: My Patents Linked -- http://patents.justia.com/inventor/ching-

lang-lin

Wireless Test Engineer (Contract), Broadcom Corporation, Sunnyvale CA,

6/2012 - Present

Working on WiFi/LTE/BT 802.11ac/n/a in DVT for Test, Verification,

Validation and Debug, in board level

Achieved in LTE,/WiFi Blocker/ACI Tests

- Built The LTE/WiFi ATE Station in Evolution Developing

- Blocker Tests and ACI Tests

. Achieved in WiFi/Bluetooth Coexistence Tests

- Built The WiFi/BT Coexistence ATE Station in Evolution

Developing

- 2.4 GHz PER and Throughputs Tests

Achieved Test, Verification and Validation using ATE Station for

boards

- Using Agilent ENA 5071C Network Analyzer to test filters,

Splitters, Switches and Couplers to acquire S11, S12, S21 S22 to

validate them for hundreds ATE Stations

- Using Broadcom's WLAN MFGc (Manufacturing in C++) Hotel and

Wireless Drivers with Attenuators, Power Meter, Spectrum

Analyzer, Signal Generator and IQexl, for true MIMO 3x3 streams

(3x3 Array Antennas) tests

- Analyzing/Debugging with Sniffer on EVM, TX Power, PA Trimming,

Power Detection test, PER floors, Rx Gain Error, RX Sensitivity,

RSSI, RX Throughput and TX Throughput in REF-to-DUT, LitePoint-

to-DUT and DUT-to-Power-Meter Paths

- Developed/Modified Python Script and Test Scripts for

optimization and verification

- Board Qualification for Golden REF Cards

- MIMO Beamforming Tests

Achieved building 20 ATE Stations qualified for boards tests

- Microwave Forming Network Design/Assembly

- RF Paths Calibration/Assembly: TX, RX, Sniffer and ACI (Adjacent

Channel Interference) Paths

- ATE Station Design/Qualification

WiFi AP and Network Engineer (Contractor), Time Warner Cable (TWC),

Herndon VA, 2/2012 - 3/2012 (Contract end)

Worked on WiFi AP/Routers Test, Verification, Validation and Debug, in

Cisco, Belair and Ruckus's Indoor/Outdoor Aps/Controllers

Documented Test Plans and Test Cases below, and Executed Test,

Verification and Validation in:

- Traffic prioritization tests - VoIP and HD Video

- Ping-pong service disruption mitigation test - A roaming Test

- Throughput in different locations test -- Throughput and

fairness with 802.11n/a devices under different RF conditions

2.4/5 GHz using 20/40 MHz Tests

- Throughput test with Wi-Fi interferers -- Co-channel

interference and Adjacent-channel interference

- Dual band steering test, Receiver Sensitivity test, Transmit

Power test, DHCP Relay support test

- Multiple SSID support Test -- SSID scanning, separate bands,

SSID capacity

. Roaming and Coverage Test using WaveDeplopment and ESS (Ehahau)

- Handoff test using Time Warner Cable Core Networks

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

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

Wireless Network Expertise:

. Achieved using IXIA, VeriWave 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

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

Evaluation, Design and Development in Wireless Driver

Knowledge of C/C++ and scripting 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

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

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

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:

. U. S Patent# 7304608: Wireless Network Apparatus And Adaptive Digital

Beamforming Method Thereof

. U. S Patent# 7206549: System and method for testing wireless devices

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 WCDMA/GSM Chipset Specifications Development in Direct

Conversion (Zero-IF) Receiver and Transmitter, using ADS/MATLAB in

Simulation/Analysis

. Achieved designing and developing a Direct Conversion (Zero-IF)

receiver in chipset for Spec

. 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

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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