Application Notes & Technical Papers
by Company / Source Name

These application notes on vendor sites are some of the fastest moving targets on the web. If you try to hit one of the links and it is gone, please make an attempt to determine the new URL and notify me. Thank you. Due to how large the original page has grown, multiple pages are now used.

Application Notes & Technical Papers by Product:  Absorbers - Interference

Application Notes & Technical Papers by Product:  LEDs - ZigBee 

• Amplifier Test
  cp.literature.agilent.com/litweb/pdf/5990-4128EN.pdf
• Bluetooth Manufacturing Test - A Guide to Getting Started
  cp.literature.agilent.com/litweb/pdf/5988-5412EN.pdf
  
• Choosing the Right Power Meter and Sensors
  literature.agilent.com/litweb/pdf/5968-7150E.pdf
  
• Coaxial Electromechanical Switches
  cp.literature.agilent.com/litweb/pdf/5989-6085EN.pdf
  
• Digital Modulation in Communications Systems - An Introduction
  cp.literature.agilent.com/litweb/pdf/5965-7160E.pdf
  
• GPS Receiver Verification
  cp.literature.agilent.com/litweb/pdf/5990-6279EN.pdf
  
• Memory Effects in Microwave Components
  cp.literature.agilent.com/litweb/pdf/5990-5799EN.pdf
  
• MIMO RF Test and Debug
  cp.literature.agilent.com/litweb/pdf/5990-6080EN.pdf
  
• Oscilloscope Fundamentals - Agilent App Note 1606
  cp.literature.agilent.com/litweb/pdf/5989-8064EN.pdf
  
• Search application notes by subject, type of content, or category
  home.agilent.com/agilent/facet.jspx?lc=eng&cc=US&t=80030.k.1
  
• Square Law and Linear Detection
  literature.agilent.com/litweb/pdf/5953-4444.pdf
  
• Validating Receiver Performance
  cp.literature.agilent.com/litweb/pdf/5990-6787EN.pdf

Analog Devices
analog.com

• A Design Guide to Instrumentation Amplifiers
  analog.com/en/amplifiers-and-comparators/instrumentation-amplifiers/products/index.html
  Download this 108-page, highly detailed handbook for free while it is available!
• DDS-Based Clock Jitter Performance vs. DAC Reconstruction Filter Performance
  analog.com/static/imported-files/application_notes/351016224AN_837.pdf
  
• Methodology for Narrow-Band Interface Design Between High Performance Differential Driver Amplifiers and ADCs
  analog.com/static/imported-files/application_notes/AN-1098.pdf
  
• Programming the AD5932 for Frequency Sweep and Single Frequency Outputs
  analog.com/static/imported-files/application_notes/AN-1044.pdf
  
• Programming the AD9833/AD9834
  analog.com/static/imported-files/application_notes/AN-1070.pdf
  
• Radio Design 101
  analog.com/static/imported-files/tech_articles/480501640radio101.pdf
  
• Wireless Transmitter IQ Balance and Sideband Suppression
  analog.com/static/imported-files/application_notes/AN-1100.pdf
  

• Directional Couplers - Xinger - RF Power SMT Directional Coupler Cross Reference Guide
  anaren.com/docs/app_notes/AAN-1014.pdf
  
• Hybrid (90°) Coupler - Xinger - RF Power Surface Mount Hybrid Cross Reference Guide
  anaren.com/docs/app_notes/AAN-1013.pdf
  
• Resistive products, surface mount signal distribution, cased and caseless connectorized
  anaren.com/custom/documents.cfm?doctype=4
  

Andrei Grebennikov, M/A-COM Eurotec

RF & Microwave Power Amplifier Design
Lecture 1: Nonlinear Active Device Modeling
Lecture 2: Impedance Matching
Lecture 3: PA Design Fundamentals
Lecture 4: High Efficiency Power Amplifier Design

Anritsu App Notes
us.anritsu.com/downloads
Downloadable application notes on RF & microwave test methodology. Antenna Research Associates
ara-inc.com/PDF-RF/015-standard.pdf
Standard Antenna Terms & Related Formulas.

Apex Wireless
apexwireless.com/tech_notes.htm
Frequency Hopping VS. Direct Sequence and Frequency Hopping (FH).

Applied Radio Labs
radiolab.com.au/DesignFile/DN004.pdf
Group Delay Explanations & Applications.

ARRL

arrl.org/tis/info/pdf/010102qex009.pdf
Class-E RF Power Amplifiers, by Nathan O. Sokal, WA1HQC.

ATC Ceramics

atceramics.com/pdf/technotes/dielectric_aging.pdf
Dielectric Aging Phenomenon.

Atmel Corporation

atmel.com/dyn/resources/prod_documents/doc1205.pdf
ASIC Design Guidelines.

AVX Corporation

• Benefits of Thin-Film Dielectric Chip Capacitors at VHF, UHF and Higher Frequencies - By virtue of these characteristics and excellent mechanical features, this thin film capacitor is the ideal surface mount chip for high frequency applications.
  avxcorp.com/docs/techinfo/benefilm.pdf
  
• Ceramic capacitors technical information
  avx.com/techinfo_doclisting.asp?Category=Ceramic Capacitors
  
• Energy and power handling capabilities of thin film and ceramic capacitors
  avxcorp.com/docs/techinfo/energytf.pdf

Bell System Technical Journal
bstj.bell-labs.com
All editions from 1922 through 1983. Bell Labs is the source of many significant contributions, of course, in the area of telephony, but also in memory devices, imaging devices, system organization, computers and software technology, as well as acoustics, optics, switching, transmission, wireless and data communication. Generously made available by Lucent Alcatel Lucent.

Biology Daily
biologydaily.com/biology/Capacitor
Capacitor Basics - Definitions and configurations, with some equations and illustrations.

BroadcastPapers.com
broadcastpapers.com/whitepapers.cfm?objid=2
Huge Whitepaper Collection.

Carl Lodström
The Noble Art of De-Coupling.

Colby Instruments
colbyinstruments.com

• 622 MBd ATM/SONET/SDH PHY Reference Design Development
  colbyinstruments.com/pdfs/ref_design.pdf
  
• Adjust mis-matched delay lines in Cypress Semiconductor Application Note on Jitter in Transmission Systems
  colbyinstruments.com/pdfs/jitter.pdf
  
• CPDL Operating and Programming Manual
  colbyinstruments.com/pdfs/CPDL-MANUAL.pdf
  
• Dewar-to-Dewar Data Transfer at 2 Gigabits per Second
  colbyinstruments.com/pdfs/asc98jxp.pdf
  
• Fine tuning clock source for Agilent Pattern Generator 70841B
  colbyinstruments.com/pdfs/5980-0729E.pdf
  
• Measuring Jitter in Digital Systems
  colbyinstruments.com/pdfs/5988-9109EN.pdf
  
• NEC Corporation High-resolution Measurement by a High-T Superconductor Sampler
  colbyinstruments.com/pdfs/ASC98_hidaka.pdf
  
• PDL-30A Operating and Programming Manual
  colbyinstruments.com/pdfs/PDL-30A-MANUAL.pdf
  
• PDL-100A Application for Windows XP
  colbyinstruments.com/pdfs/PDL-100A_DIST.ZIP
  
• PG-1000A Pulse Generator User Manual
  colbyinstruments.com/pdfs/PG1000A_USER_MANUAL.pdf
  
• SG-5000A Signal Generator User Manual
  colbyinstruments.com/pdfs/PG5000A_USER_MANUAL.pdf
• Phase Noise Measurements & Jitter Analysis
  colbyinstruments.com/pdfs/5988-5291EN.pdf
  
• Synchronizing differential clock sources for Bit Error Ratio Test (BERT)
  colbyinstruments.com/pdfs/5988-2861EN.pdf
  

• Tutorial 1 - Basic concepts in signal analysis, power, energy and spectrum
  complextoreal.com/chapters/signals.pdf
  
• Tutorial 2 - What is Differential Phase Shift Keying
  complextoreal.com/diffcod.htm
  
• Tutorial 3 - What is the DVB-S standard, a simplified version
  complextoreal.com/tdvbs.htm
  
• Tutorial 4 - Fourier Analysis Made easy - Part 1
  complextoreal.com/chapters/fft1.pdf
  
• Tutorial 5 - Fourier Analysis Made easy - Part 2
  complextoreal.com/chapters/fft2.pdf
  
• Tutorial 6 - Fourier Analysis Made Easy - Part 3
  complextoreal.com/fft3.htm
  
• Tutorial 7 - Hilbert Transform and the Complex Envelope
  complextoreal.com/tcomplex.htm
  
• Tutorial 8 - All About Modulation - Part 1
  complextoreal.com/chapters/mod1.pdf
  
• Tutorial 9 - Baseband, Passband and Amplitude Modulation (AM)
  complextoreal.com/base.htm
  
• Tutorial 10 - All about Traveling Wave Tube
  complextoreal.com/chapters/twta.pdf
  
• Amplifiers (TWTA) and non-linear amplification
  complextoreal.com/chapters/twta.pdf
  
• Tutorial 11 - Link Budgets 101
  complextoreal.com/chapters/linkbud.pdf
  
• Tutorial 12 - Convolutional Coding and Decoding Made Easy
  complextoreal.com/chapters/convo.pdf
  
• Tutorial 13 - Coding Concepts and Block Coding
  complextoreal.com/chapters/block.pdf
  
• Tutorial 14 - Inter Symbol Interference (ISI) and Raised cosine filtering
  complextoreal.com/chapters/isi.pdf
  
• Tutorial 15 - How to interpret an Eye diagram
  complextoreal.com/chapters/eye.pdf
  
• Tutorial 16 - Partial Response signaling and Quadrature Partial Response (QPR) modulation
  complextoreal.com/chapters/qpr.pdf
  
• Tutorial 17 - Frequency Modulation (FM) , FSK, MSK and more
  complextoreal.com/chapters/fm.pdf
  
• Tutorial 18 - Unlocking the Phase Locked Loop (PLL) - Part 1
  complextoreal.com/chapters/pll.pdf
  
• Tutorial 19 - Unlocking the Phase Locked Loop (PLL) - Part 2
  complextoreal.com/chapters/pll2.pdf
• Tutorial 20 - Modulation performance metrics and computation of BER
  complextoreal.com/chapters/modulation2.pdf
  
• Tutorial 21 - Linear Time Invariant systems and Matched filtering
  complextoreal.com/chapters/mft.pdf
  
• Tutorial 22 - Orthogonal Frequency Division Multiplex (OFDM, DMT)
  complextoreal.com/chapters/ofdm2.pdf
  
• Tutorial 23a - About Lattice and cosets
  complextoreal.com/chapters/Lattice.pdf
  
• Tutorial 23b - Trellis coded Modulation (TCM)
  complextoreal.com/chapters/tcm.pdf
  
• Tutorial 24 - Turbo Coding and MAP Decoding, Part 1
  complextoreal.com/chapters/turbo1.pdf
  
• Part 2 - The MAP decoding algorithm, step-by-step
  complextoreal.com/chapters/turbo2.pdf
  Companion worksheet
  complextoreal.com/chapters/turbo_example.xls
• Tutorial 25 - CDMA
  complextoreal.com/CDMA.pdf

Cushcraft Corporation

• Antenna Performance and Design Considerations for Optimum Coverage in Wireless Communication Systems
  cushcraft.com/comm/support/pdf/Antenna-Performance-C-14B37.pdf
  
• Antenna Performance and Design Considerations for Optimum Coverage in Wireless Communication Systems
  cushcraft.com/comm/support/pdf/Antenna-Performance-C-14B37.pdf
  

• A Guide To RF Switching Systems
  dowkey.com/_upload/AN2008-06_Guide_to_RF_Switching_Systems.pdf
  
• Creating Your Own RF Switching System
  dowkey.com/_upload/AN2008-08_CYOM_Rev1.pdf
  
• Ethernet Software Configuration Application Note
  dowkey.com/_upload/AN2008-08-ENET_Rev1-1.pdf
  
• IEEE-488.2 (GPIB) Software Configuration Application Note
  dowkey.com/_upload/AN2008-08-GPIB_Rev1-1.pdf
  

EDN Access
reed-electronics.com/ednmag/archives/1996/120596/25df_04.htm
Battery Handling - Li-Ion, by Matt Schindler.

EDN

• DACs - Double Rate With Mixers - Double DAC rate by using mixers as switches, by Randall Carver.
  edn.com/article/CA376628.html

Electronic Design
electronicdesign.com/Articles/ArticleID/9660/9660.html
Clock Requirements for Data Converters - Equations for calculating jitter and phase noise in data converters, by Don Tuite.

Electrostatic Discharge Association
esda.org
Publications include standards and documents, books, EOS/ESD Symposia proceedings, selected papers and white papers, EOS/ESD Symposia presentations, ESD tutorial and seminar notes.

Emerson & Cuming Microwave Products

• Absorber Principles - Specular, 1/4 wavelength, graded absorber, surface currents, cavity resonance.
  eccosorb.com/pages/83/Technical Notes
  
• Electromagnetic principles & applications that span the frequency range from 30 MHz through 100 GHz. Describes applications and properties.
  eccosorb.com/pages/115/WH Emerson paper
  

Evaluation Engineering
evaluationengineering.com/archive/articles/1005/1005the_world.asp
The World of the Near Field, by Tom Lecklider.

FlexiPanel
flexipanel.com/Docs/Bluetooth Remote Control... From Your Mobile Phone.pdf
Bluetooth Remote Control from Your Mobile Phone. FlexiPanel makes a lot of turnkey modules for ZigBee and Bluetooth applications. Admittedly, this concept does scare me a bit from a terrorist perspective!!!

Freescale Semiconductor

• Compact Integrated Antennas - Starts with basic antenna theory and builds through dipole, inverted-F, helix, loops, meandering, and other types. Ends with layouts & radiation patterns.
  freescale.com/files/rf_if/doc/app_note/AN2731.pdf

Granite Island Group
tscm.com/antennas.pdf
Antenna Basics - In PDF format.

Herley
herley.com/index.cfm?act=app_notes&notes=attenuators
Application Notes: Attenuators.

High Frequency Electronics
highfrequencyelectronics.com/Archives/Oct04/HFE1004_Kurzrok.pdf
A Review of Key Equalizer Specifications and What They Mean, by Richard Kurzrok.

High Frequency Electronics
highfrequencyelectronics.com/Archives/Oct04/HFE1004_Kurzrok.pdf
Electromagnetic Radiation and Human Health: A Review of Sources and Effects.

HP Journal Online Archive
hpl.hp.com/hpjournal/pdfs/IssuePDFs/hpjindex.html
This appears to be a complete collection of the HP Journal, running from September 1949 (v1. n.1) through February 1998.

Electronic Design
web-ee.com/primers/Tutorials.htm
WebEE series of tutorials & primers. Many articles on Amplifiers and Filters, Batteries, Classes in Electronics, CMOS, Communications, Digital Filters, Electrostatics, Microprocessors, Medical, MOSFETs, Motors, Operational Amplifiers, Optoelectronics, PC Related, Phase Locked Loops, Power Conversion, Pressure Sensors, and Printed Circuit Boards.

INGECOM
numatechnologies.com/pdf/an_antenna.pdf
V / UHF Antenna Design.

Instruments For Industry
ifi.com/web/html/appnotes/pdf/101.pdf
Selection and Operation of RF Power Amplifiers for EMC Testing Applications.

International Rectifier App Notes
irf.com/technical-info/appnotes.htm
App notes in .pdf format including motor control, lighting, high voltage ICs, class D audio, automotive, AC-DC, DC-DC, aerospace and defense, general, MOSFET, IGBT, diode, package, thermal.

Intersil
intersil.com/data/an/an9315.pdf
RF Amplifier Design Using HFA3046, HFA3096, HFA3127, HFA3128 Transistor Arrays.

Ivan Boshnakov, Aerial Facilities Limited

First-Time-Right Design Of RF/Microwave Class A Power Amplifiers Using Only S-ParametersA procedure of how to design RF/Microwave Class A power amplifiers in a very efficient and highly accurate manner when the only initial data available are the S-parameters of the transistors.

Johanson Technology

• Capacitor Q & ESR Explained
  johansontechnology.com/technicalnotes/qne
• Capacitor RF Current & Power
  johansontechnology.com/technicalnotes/rfc
• Chip Balun: Definitions & Measurement
  johansontechnology.com/technicalnotes/cbn

• Antennas: Design, Application, and Performance
  linxtechnologies.com/Documents/AN-00500.pdf
• Modulation Techniques for Low-Cost RF Data Links
  linxtechnologies.com/documents/AN-00130.pdf
• RF 101 Information for the RF Challenged
  linxtechnologies.com/Documents/AN-00100.pdf
• Understanding Antenna Specifications and Operation
  linxtechnologies.com/Documents/AN-00501.pdf
• List of all application notes
  linxtechnologies.com/Support/Application-Notes

M/A-COM

• Part I: A General Design Procedure for Bandpass Filters Derived From Low Pass Prototype Elements
  macom.com/Technical Articles/pdf/Bandpass_Filter_tutorial.pdf
• Part II: A General Design Procedure for Bandpass Filters Derived From Low Pass Prototype Elements
  macom.com/Technical Articles/pdf/Bandpass_Filter_tutorial2.pdf
• Design information, product information, quality information
  macom.com/Application Notes/index.htm
• RF Directional Couplers and 3dB Hybrids Overview
  macom.com/Application Notes/pdf/m560.pdf

• A/D and D/A conversion / sampling circuits
  maxim-ic.com/appnotes10.cfm/ac_pk/2
• A Measurement Technique for Determining RF Immunity
  maxim-ic.com/appnotes10.cfm/ac_pk/2
• Analog Filter Design Demystified
  maxim-ic.com/appnotes.cfm/appnote_number/1795
• Improving Receiver Intercept Point Using Selectivity
  pdfserv.maxim-ic.com/en/an/AN749.pdf
• Mixer 2x2 Spurious Response and IP2 Relationship
  maxim-ic.com/appnotes.cfm/appnote_number/1838/ln/en
• Search application notes by category or by part number
  maxim-ic.com/appnotes10.cfm
• Understanding Common-Mode Signals
  maxim-ic.com/appnotes.cfm/appnote_number/2045/ln/en

Maury Microwave
maurymw.com/support/appnoteslibrary/appnoteslib.htm

Download application notes relating to Maury products and subjects of interest. MECA Electronics

• Directional Coupler Basics
  e-meca.com/tech_papers/directional-coupler-specs.htm
• Hybrid Coupler Basics
  e-meca.com/tech_papers/hybrid_basic.htm

• IP Dust and Water Protection Rating
  e-meca.com/tech_papers/ip65.php

• Isolator/Circulator Basics
  e-meca.com/tech_papers/iso_cir.htm
• Power Dividers as Combiners
  e-meca.com/tech_papers/why_dividers.htm

• Reactive Splitters
  e-meca.com/tech_papers/splitters.htm

• Why Directional Couplers Are Better for High Power Measurements vs. Attenuators
  e-meca.com/tech_papers/powerkit.php
• WiMAX - A brief introduction to basic concepts and differences to WiFi
  e-meca.com/tech_papers/wimax-wifi.phpe-meca.com/tech_papers/powerkit.php

• Directional Coupler Basics (MAP-701)
  e-meca.com/tech_papers/directional-coupler-specs.php
  
• Hybrid Coupler Basics
  e-meca.com/tech_papers/hybrid_basic.php
  
• IP Ratings Explained
  e-meca.com/tech_papers/ip65.php
  
• Isolator/Circulator Basics
  e-meca.com/tech_papers/iso_cir.php
  
• Power Dividers as Combiners (MAP-801)
  e-meca.com/tech_papers/why_dividers.php
  
• Reactive Splitters
  e-meca.com/tech_papers/splitters.php
  
• RF Power Measurement Kit
  e-meca.com/tech_papers/powerkit.php
  

Micrel
micrel.com/_PDF/App-Notes/an-23.pdf
Antenna Design Tutorial, by Tom Yestrebsky.

Microwave Product Digest
mpdigest.com

• How To Choose the Best Test Cable, by Paul Tusini
  mpdigest.com/Articles/2004/Aug2004/times/Default.htm
  
• The Right Antenna Makes GPS Work - by Sarantel
  mpdigest.com/Articles/2004/Apr2004/sarantel/Default.htm
  

Motorola
http://www.motorolasolutions.com/US-EN/Home?WT.tsrc=Georedirects

N6CA, ham-radio.com
ham-radio.com/n6ca/50MHz/50appnotes/50ants.html
Antenna Application Notes.

Narda Microwave East

• Attenuators (Step, Fixed, Variable)
  nardamicrowave.com/east/UserFiles/atten_notes.pdf
  
• Couplers
  nardamicrowave.com/east/UserFiles/couplers_notes.pdf
  
• Fiber Optic Products
  nardamicrowave.com/east/UserFiles/fiberoptic_notes.pdf
  
• Free Running Oscillators
  nardamicrowave.com/east/UserFiles/freerunning_notes.pdf
  
• Hybrids
  nardamicrowave.com/east/UserFiles/hybrids_notes.pdf
  
• Microwave Integrated Circuits / Multifunction Assemblies (MIC and MFA)
  nardamicrowave.com/east/UserFiles/MIC.pdf
  
• Power Dividers
  nardamicrowave.com/east/UserFiles/powerdividers2.pdf
  
• Power Meters and Monitors
  nardamicrowave.com/east/UserFiles/pm398(1).pdf
  
• Terminations
  nardamicrowave.com/east/UserFiles/term_notes.pdf
  
• Waveguide
  nardamicrowave.com/east/UserFiles/waveguide175.pdf
  

National Instruments
zone.ni.com/devzone/cda/tut/p/id/3237
Designing Filters Using the Digital Filter Design Toolkit, by Rahman Jamal, Mike Cerna, John Hanks.
National Taiwan University

• Amplifier Design (Microwave) - Very informative presentation
  cc.ee.ntu.edu.tw/~thc/course_mckt/note/note9.pdf
  
• Filter Design - Transmission Line  (in English)
  cc.ee.ntu.edu.tw/~thc/course_mckt/note/note7.pdf
  
• Network Analysis (in English)
  cc.ee.ntu.edu.tw/~thc/course_mckt/note/note3.pdf
  
• Directional Couplers & Power Dividers
  cc.ee.ntu.edu.tw/~thc/course_mckt/note/note6.pdf
  

Naval Education & Training Professional Development & Technology Center
cs.tcd.ie/Stephen.Farrell/ipn/background/US-Navy-NEETS/Module10-14182.pdf
Navy Electricity and Electronics Training Series Module 10 - Introduction to Wave Propagation, Transmission Lines, and Antennas.

Navy's Electrical Engineering Training Series (NEETS)
tpub.com/neets
The entire series downloadable in PDF format.

Nikonians
nikonians-images.com/ebooks/Nikonians Battery Guide.pdf
Battery Selection Guide - Lots of good information on battery chemistries and charge/discharge characteristics.

Noisecom
noisecom.com

• Accurate Es/No for DOCSIS / CATV BER Measurements
  noisecom.com/applicationnotes/appnote122.pdf
  
• BIT of Balanced Amplifiers
  noisecom.com/applicationnotes/appnote106.pdf
  
• Calibrating Spectrum Analyzers With a Noise Source
  noisecom.com/applicationnotes/appnote112.pdf
  
• Gain Bandwidth Product Tests To Cut Production Costs
  noisecom.com/applicationnotes/appnote110.pdf
  
• Noise Diodes Randomize Quantization Errors in A/D Converters
  noisecom.com/applicationnotes/appnote109.pdf
  
• Improving Noise Figure Measurement
  noisecom.com/applicationnotes/appnote121.pdf
  
• Noise-Injection Radiometers
  noisecom.com/applicationnotes/appnote119.pdf
  
• Testing Amplifier Linearity With Noise Power Ratio
  noisecom.com/applicationnotes/appnote117.pdf
  

Orban Microwave Products
orbanmicrowave.com/The_Basics_Of_Patch_Antennas.pdf
Antenna application notes from Orban Microwave Products.

Paul Wade W1GHZ
w1ghz.org/antbook/contents.htm
The W1GHZ Online Microwave Antenna Book - Excellent - a good reference for all microwaves.

Pletronics, Inc.
pletronics.com

• Comparative Analysis of MEMs
  pletronics.com/getfile.php?id=131
  
• FD7T Users Guide
  pletronics.com/getfile.php?id=141
  
• TCXO vs OCXO
  pletronics.com/getfile.php?id=231
  

• Driving the QM Series Quadrature Modulators
  polyphasemicrowave.com/datasheets/AN-101A.pdf
  
• Interface Circuits for the QD Series Quadrature Demodulators
  polyphasemicrowave.com/datasheets/AN-102A.pdf
  

Praxsym
praxsym.com

• PAMS (Portable Attenuation Measurement System)
  praxsym.com/documents/PAMSapplicationnotes2.pdf

RF Design

• Detecting Interfering Signals and Mitigating Them, by Steve Thomas.
  rfdesign.com/mag/radio_detecting_interfering_signals
  
• Fractals’ New Era in Military Antenna Design, by Nathan Cohen.
  rfdesign.com/mag/508RFDSF1.pdf
  
• Power Supply and Ground Design for WiFi Transceiver, by By Roger Bremer, Tracey Chavers, Zhongmin Yu.
  rfdesign.com/mag/radio_power_supply_ground
  
• Predicting junction temperature and MTTF for MMIC devices, by Radha P.N. Setty.
  rfdesign.com/mag/508RFD33.pdf
  
• Sampling & Aliasing - Mathematical basics of band-limited sampling and aliasing, by Vladimir Vitchev.
  rfdesign.com/mag/radio_mathematical_basics_bandlimited
  

Signal Processing Group, Inc
signalpro.com/bfailure.htm
Bond wire failures ( fusing) in integrated circuits with pulsed currents – an analytical view.

Skyworks
skyworksinc.com

• A Level Detector Design for Dual-Band GSM-PCS Handsets
  skyworksinc.com/products_display_item.asp?did=2064
  
• A Wideband General Purpose PIN Diode Attenuator
  skyworksinc.com/products_display_item.asp?did=2304
  
• Design With PIN Diodes
  skyworksinc.com/uploads/documents/200312C.pdf
  
• Cellular Handset Antenna Efficiency Measurement Using the Wheeler Cap
  skyworksinc.com/products_display_item.asp?did=3996
  
• GaAs FETs as Control Devices
  skyworksinc.com/uploads/documents/APN2015.pdf
  
• Mixer and Detector Diodes
  skyworksinc.com/uploads/documents/200826A.pdf
  
• PIN Diode Basics
  skyworksinc.com/uploads/documents/200823A.pdf
  
• Positive Voltage Operation of GaAs Control ICs
  skyworksinc.com/uploads/documents/200363A.pdf
  
• Solder Reflow Information
  skyworksinc.com/uploads/documents/200164B.pdf
  
• Theory and Application of Sampling Phase Detector
  skyworksinc.com/uploads/documents/200328B.pdf
  
• Two-Tone vs. Single-Tone Measurement of 2nd-Order Non-linearity and IP2 Performance of Direct Conversion Receivers
  skyworksinc.com/products_display_item.asp?did=1024
  
• Varactor Diodes
  skyworksinc.com/uploads/documents/200824A.pdf
  

• Amplifier Operating Temperature Definitions
  spectrummicrowave.com/pdf/Amplifier_Operating_Temperature_Definitions.pdf
  
• Hybrid Voltage Controlled Oscillators
  spectrummicrowave.com/pdf/VCO_application_notes.pdf
  
• LCA - Low Cost Amplifiers
  spectrummicrowave.com/pdf/Amplifier_Operating_Temperature_Definitions.pdf
• Selecting and Using Miniature Microstrip and Surface-mount Mixers
  spectrummicrowave.com/pdf/Mixer_Application_Notes.pdf

Telecontrolli
seapraha.cz/Download/AntennaDesign.pdf
Antenna Design Considerations.

Texas Instruments
focus.ti.com/analog/docs/amplifiersandlinearhome.tsp?familyId=57&contentType=4
Amplifiers & linear including audio amplifiers, op amps, comparators, current sensing, difference amplifiers, instrumentation amplifiers, isolation analog amplifiers, logarithmic amplifiers, sensors, sensor conditioning, 4-20mA transmitters, solenoid/valve power drivers (PWM), TEC & pump laser bias.

Texas Instruments

• Clocks & timers including clock circuits, real-time clocks, memory interface clocks and registers, digital media systems clocks, data communications clocks, wireless base station clocks.
  focus.ti.com/analog/docs/techdocs.tsp?familyId=346&navSection=app_notes&contentType=8
  
• Data converters including analog monitor & control circuitry, analog to digital converters, CODECs, digital to analog converters, MicroSystem mixed-signal data converters, touch screen controllers.
  focus.ti.com/analog/docs/techdocs.tsp?familyId=82&navSection=app_notes&contentType=8
  
• Digital signal processing including DaVinci™ digital media processors, C6000™ high performance DSPs, C5000™ power-efficient DSPs, C2000™ digital signal controllers, other TMS320™ DSPs.
  focus.ti.com/dsp/docs/dspsupporttechdocs.tsp?sectionId=3&tabId=409&techDoc=1&familyId=44&documentCategoryId=1
• Interface including 1394, CAN, display interface, isolators, LVDS/M-LVDS/ECL/CML, PCI, RS-232, RS-422, RS-485, SCSI termination & transceivers, serializers & deserializers, UARTs, USB.
  focus.ti.com/analog/docs/techdocs.tsp?familyId=361&navSection=app_notes&contentType=8
  
• Power management including AC/DC & DC/DC power supplies, battery management, hot swap & power distribution, linear regulators, plug-in power modules, power management special functions, supervisory circuits (voltage supervisors), non-isolated switching, DC/DC regulators, power management multi-channel IC (PMIC) solutions, lighting and display solutions, references, fusion digital power(TM) control solutions.
  focus.ti.com/analog/docs/techdocs.tsp?familyId=64&navSection=app_notes&contentType=8
  

• Designing High Efficiency Amplifiers using HFETs
  triquint.com/prodserv/tech_info/docs/mmw_appnotes/hfetapp.pdf
• Package / Tape & Reel Information
  triquint.com/prodserv/tech_info/tape_and_reel.cfm
  
• PC Board Layout Tips
  triquint.com/prodserv/tech_info/pcb_tips.cfm
  
• Qualification Flow Chart
  triquint.com/prodserv/tech_info/qual_flow_chart.cfm
  
• Soldering Profile
  triquint.com/prodserv/tech_info/soldering.cfm
  

University of California
xanadu.ece.ucsb.edu/~long/ece145a/PA_notes1.pdf
Power Amplifier Design Lectures - ECE 145A/218A, by Professor Steve Long.

University of California
ece.ucsb.edu/rad/pubs/master/oisler_2004.pdf
RF Power Amplifier Design - Design and Implementation of a Common Collector Class B RF Power Amplifier in InGaP HBT Technology, by Oliver Isler.

University of Guelph
uoguelph.ca/~antoon/gadgets/caps/caps.html
Capacitor history - A very nice introduction to capacitors including history back to Leyden Jar, by Tony van Roon.

University of Illinois Urbana-Champaign
courses.ece.uiuc.edu/ece450/Notes/TransmissionLines1.pdf
Complex Numbers, Phasors & Circuits - Another great PowerPoint presentation from, by Professor Amanogawa.

University of San Diego
sandiego.edu/~ekim/e194rfs01/rfamp.pdf
Amplifier Design - Design of Microwave Transistor Amplifiers Using S Parameters - EEE 194 RF course material.

University of San Diego, CA
home.sandiego.edu/~ekim/e194rfs01/filterek.pdf
Filter Design, Distributed Element, from Ernie Kim. Periodic structures and equivalent lumped element models.

University of San Diego, CA
sandiego.edu/~ekim/e194rfs01/minl_atten/minlosatten.html
Minimum loss attenuator, from Ernie Kim, Reference - RF Design Guide: Systems, Circuits and Equations. Peter Vizmuller.

University of San Diego, CA
sandiego.edu/~ekim/otherjunk/inductor.pdf
RF inductor design, from Ernie Kim.

University of Surrey
ee.surrey.ac.uk/Personal/D.Jefferies/antennas.html
A very extensive treatise of many antenna types, including definitions, photos, and examples, by David Jefferies.

University of Surrey
ee.surrey.ac.uk/Personal/D.Jefferies/yagiuda.html
Yagi-Uda Antennas - Tutorial with photographs of actual antennas, by David Jefferies.

Vectron International
vectron.com/products/appnotes/jitter.htm
Jitter in Clock Sources.

Virginia Polytechnic Institute & State University
scholar.lib.vt.edu/theses/available/etd-92598-152639/unrestricted/KIRAN2.PDF#search='dielectric constant portland concrete'
Effect of Admixtures, Chlorides, and Moisture on Dielectric Properties of Portland CementConcrete in the Low Microwave Frequency Range, Thesis by Kiran Pokkuluri.

Virginia Polytechnic Institute & State University
antd.nist.gov/wctg/manet/docs/models.pdf#search='dielectric constant building walls concrete'
Ultra-wideband Propagation Measurements and Channel Modeling. DARPA NETEX Program Report on Through-the-Wall Propagation and Material Characterization.

Wenzel Associates
wenzel.com/pdffiles/RFDesign3.pdf
Low Frequency Circulator/Isolator Uses No Ferrite or Magnet, by Charles Wenzel.

Zarlink Semiconductor
assets.zarlink.com/AN/an4855.pdf
GPS Receiver Hardware Design.

Z-Communications Inc.
zcomm.com

• Band Switching Voltage Controlled Oscillators
  zcomm.com/PDFs/appNotes/AN-105.pdf
• Low Cost, Extremely Wide Bandwidth VCO Design using multiplxers and Z-Comm VCOs
  zcomm.com/PDFs/appNotes/AN-110.pdf
• Manual Soldering Technique for Z-Comm VCOs
  zcomm.com/PDFs/appNotes/AN-107.pdf
• Marking Orientation and Tape Placement of Z-Comm VCOs
  zcomm.com/PDFs/appNotes/AN-111.pdf
• Mounting and Grounding of Surface Mount Z-Comm VCOs
  zcomm.com/PDFs/appNotes/AN-101.pdf
• Phase Noise Measurement of Z-Comm VCOs
  zcomm.com/PDFs/appNotes/AN-109.pdf
• Phase Noise Measurement of Z-Comm SFS Series
  zcomm.com/PDFs/appNotes/AN-205.pdf
• Programming Z-Comm PLLs
  zcomm.com/PDFs/appNotes/AN-202.pdf
• Proper Output Loading of Z-Comm VCOs
  zcomm.com/PDFs/appNotes/AN-102.pdf
• Pulling Measurement of Z-Comm VCOs
  zcomm.com/PDFs/appNotes/AN-113.pdf
• Using Convection Ovens for Attaching Z-Comm VCOs
  zcomm.com/PDFs/appNotes/AN-112.pdf