SFFM Voltage Source

Single-frequency frequency-modulated voltage source

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Libraries:
Simscape / Electrical / Additional Components / SPICE Sources

Description

The SFFM Voltage Source block represents a frequency-modulated AC voltage source whose output voltage value is independent of the current through the source. The following equation describes the output voltage as a function of time:

$$V_{out}=VO+VA*\sin \left(\left(2\pi *FC*Time\right)+MI*\sin \left(2\pi *FS*Time\right)\right)$$

where:

• V0 is the Voltage offset, VO parameter value.

• VA is the Voltage amplitude, VA parameter value.

• FC is the Carrier frequency, FC parameter value.

• MI is the Modulation index, MI parameter value.

• FS is the Signal frequency, FS parameter value.

Examples

Frequency-Dependent Transmission Line

A custom frequency-dependent transmission line model. The characteristic admittance and propagation function are first derived from the frequency-dependent resistance, reactance, and susceptance. The derived values are fitted using RF Toolbox. The Universal Line Model (ULM) [1] is then implemented in Simscape based on the fitted parameters. The results from the frequency-dependent transmission line model and the classic pi-section transmission line model are compared.

• Open Model

Ports

Conserving

+ — Positive voltage

electrical

Electrical conserving port associated with the SFFM voltage source positive voltage

- — Negative voltage

electrical

Electrical conserving port associated with the SFFM voltage source negative voltage

Parameters

Voltage offset, VO — Voltage offset

0 V (default)

Magnitude of the time-independent part of the output voltage.

Voltage amplitude, VA — Voltage amplitude

0 V (default)

Magnitude of the sinusoidal part of the output voltage.

Carrier frequency, FC — Carrier frequency

0 Hz (default) | nonnegative scalar

Frequency of the carrier wave. The value must be greater than or equal to 0.

Modulation index, MI — Modulation index

0 (default) | nonnegative scalar

Amount by which the modulated signal varies around its unmodulated level. The value must be greater than or equal to 0.

Signal frequency, FS — Signal frequency

0 Hz (default) | nonnegative scalar

Frequency of the modulated signal. The value must be greater than or equal to 0.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2008a