Qorvo
Maximum Power Reduction Calculator
The maximum output power requirements for LTE user equipment is specified by the 3GPP TS 36.521 specifications and contains requirements for both the maximum output power as well as the output power tolerance. This calculator allows you to determine the maximum power reduction for two component carriers.
Modelithics® Qorvo GaN Library
Qorvo and Modelithics collaborate to provide designers with high-accuracy nonlinear simulation models for Qorvo GaN transistor devices. The Modelithics® Qorvo GaN Library has been developed using "best-in-class" measurement and modeling techniques. Modelithics is well-known for providing highly accurate measurement-based, advanced feature simulation models, offering powerful substrate and part-value scaling capability, instrumental in high frequency design. Modelithics' model libraries integrate seamlessly with the latest electronic design automation (EDA) simulation tools, and are thoroughly documented, with a model information data sheet for each model.
PAE/Pdiss/Tj Calculator
This calculator helps you calculate your power added efficiency (PAE), power dissipation and maximum junction temperature.
PAE is a measure rating the efficiency of a PA which considers the effect of the gain of the amplifier. PAE will be like efficiency when the gain of the amplifier is high.
Power dissipation is the process in which an electric device produces heat as an unwanted byproduct of its primary action. If a circuit current flows through a given element, losing voltage in the process, then the Pdiss by that circuit element is the product of the current and voltage (P = I x V).
Junction temperature is the highest operating temperature of the actual semiconductor in an electronic device.
ADI DiffAmpCalc™ 
Analog Devices
For designing differential amplifier circuits and reducing design time from hours to minutes! The tool is easy to use and features an interactive user interface to quickly get you up and running.
Free Download
ADIsimPLL™ 
Analog Devices
The ADIsimPLL design tool is a comprehensive and easy-to-use PLL synthesizer design and simulation tool. All key non-linear effects that can impact PLL performance can be simulated, including phase noise, Fractional-N spurs, and anti-backlash pulse.
Free Download (Requires Registration)
CST Studio Suite
SIMULA, Dassault Systèmes
CST Studio Suite is an industry-leading EM simulation tool, with multiple solvers for suitable for a wide range of applications. This includes the CST MPHYSICS® STUDIO package of multiphysics solvers, comprising Stationary and Transient Thermal Solvers, a Conjugate Heat Transfer Solver for air flow and electronics cooling simulation, and Structural Mechanical Solver capable of calculating thermal expansion and deformation. The engineer can then import the deformed structure back into the EM simulation in order to calculate how thermal expansion detunes the device.
Cascaded Noise Figure Calculator
Pasternack 
Pasternack's Cascaded Noise Figure Calculator computes the total noise and gain of cascaded amplifiers.
Free Online
Complete RF Amplifier Design and Analysis Calculator
Daycounter, Inc.
Given an amplifier or transistor's the S-parameters (scattering parameters), this calculator will analyze its stability, maximum gain, an even suggest a suitable conjugate L-matching network for a given load and source impedance of the circuit to which the amplifier will be connected.
Free Online
Mixer Spurs Calculator
José Luis Flores
A new method for mixer spurs calculation has been developed which is easier and more straightforward to use than the traditional spurs chart approach when dealing with the frequency plan optimization in broadband double conversion transceivers suitable for applications as multi-band, multi-standard and Software Defined Radio. A full technical article describing this new method can be found here.
Free Download
Power Added Efficiency Calculator 
Pasternack
Pasternack's Power Added Efficiency Calculator returns efficiency on an amplifier from input, output, and DC power.
Free Online
HeatWave
Keysight Technologies
HeatWave Electro-Thermal Analysis Software is an IC thermal simulator for chips and stacked-die SiP. HeatWave works with several IC design tools, including Cadence Virtuoso. A version of the HeatWave solver is also available in Advanced Design System (ADS) for RFIC and MMIC applications.
License Required
Icepak
ANSYS
ANSYS Icepak accurately predicts airflow, temperature and heat transfer in a wide variety of electronic and power electronic components and PCBs. It can also perform thermal analysis of system-level applications such as data centers, computers and telecommunications equipment.
License Required
Modelithics COMPLETE Library™
Modelithics
Modelithics COMPLETE Library™ is a collection of simulation models for all types of passive and active RF & Microwave devices engineered to enable designers to go from concept to product faster and easier. These models for discrete die, surface mount and packaged devices are a must-have for anyone involved in PCB-based RF & Microwave circuit or module design. Modelithics models offer scalability by substrate, part value, pad size, temperature, and other characteristics. The models are engineered to simulate typical device response including related parasitics. Our Model Library software product is available for use with Keysight Technologies’ PathWave Advanced Design System (ADS), AWR Design Environment/ Microwave Office™, Keysight Technologies’ PathWave RF Synthesis (Genesys), ANSYS® HFSS™, Sonnet® Suites™ and Cadence Spectre RF.
Amplifier Calculators
Mini-Circuits
Mini-Circuits provides calculators for Gain Uncertainty, Insertion Loss Uncertainty and Cascade Noise Figure for amplifier circuits. These calculators are also available in app version on Google Play and iTunes.