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Circuit Envelope Fundamentals

Envelope signal representation, Circuit Envelope library, and simulation

The circuit envelope technique speeds up RF system simulation. In Simulink®, simulating high-frequency signals requires a time step proportional to the highest frequency present in the RF system. However, the modulation frequency or envelope of the RF signals can be several orders of magnitude smaller than the highest frequency. The circuit envelope technique takes advantage of this condition to model RF signals accurately while reducing simulation time. For more information on envelope signal representation, see Circuit Envelope Basics.

To learn how to build an RF system using the circuit envelope library, see Getting Started with RF Modeling.


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Continuous WaveModel constant envelope source
NoiseModel noise using current or voltage noise source in RF systems
SinusoidModel DC offset and sinusoidal modulation
ConfigurationDefine system simulation settings
InportConvert Simulink input signal to RF Blockset signal
OutportConvert RF Blockset signal to Simulink output signals
Connection PortConnection port for RF subsystem
GroundSimulate connection to electrical ground
Spectrum AnalyzerDisplay frequency spectrum of time-domain signals
Connection LabelVirtual connection between circuit envelope ports (Since R2022a)