Planet Analog

Ardem Associates (Prof. Middlebrook's site, provides very practical information on design-oriented analysis and feedback theory)

RF Globalnet

RF Cafe

Spread Spectrum Scene

New Wave Instruments RF & microwave resources

Circuit Sage

RF Design House (Korean)

IEEE 802 standards

Glossary of Telecommunication Terms

Bluetooth

GSM World

European Telecommunications Standards Institute

WiMax Forum

Spectre syntax module for Vim; Verilog-AMS syntax module for Vim

Simulator syntax modules for Emacs; Verilog syntax modules for EMACS

AboutSpice.com

eCircuitCenter.com

BSIM MOSFET transistor models

NXP (formerly Philips) compact models (MOS9, MOS11, PSP, Mextram, etc.)

EKV compact MOSFET model

PSP model (Official Arizona State site, NXP site, Old SP site)

HiSIM IGFET model

VBIC bipolar transistor model

HICUM bipolar transistor model

PSFET MESFET model

Compact Model Council

Power semiconductor models

ADMS Open Source Model Compiler (ADMS, ZSPICE)

Silvaco compact models in Verilog-A

EDA Industry Working Groups

Verilog-AMS standards committee: home and sample library

VHDL-AMS standards committee

Verifica Verilog and VHDL library

Southampton VHDL-AMS Validation Suite

Behavioral Modeling and Simulation Conference (BMAS) archives

IBIS (I/O Buffer Information Specification)

RF Globalnet Forums (microwave)

Comp.CAD.Cadence (Cadence tools)

SI-List (signal integrity)

EDA Board (general)