SimRF Inport - Convert Simulink input signal to SimRF signal

Library

Utilities

Description

The SimRF Inport block imports sample-based Simulink signals into the SimRF circuit-envelope simulation environment. For more information about simulating RF systems, see the example, Reduce Computations by Using RF Simulation Techniques.

Complex-valued, sample-based input signals I_k(t) + j · Q_k(t) become the modulations of the frequencies {f_k} specified in the Carrier frequencies parameter of the block:

The Source type parameter specifies the SimRF signal as either a current signal i(t) or a voltage signal v(t) in the SimRF environment.

Dialog Box and Parameters

Source type

Specify a current, voltage, or power source. If the input signal is a vector containing more than one signal, the block assigns the kth input signal to the kth carrier.

Choose how the block interprets the Simulink signal:

• Ideal voltage — The block outputs the Simulink signal as a voltage signal v(t) in the SimRF environment. When you choose this option, the following figure illustrates the internal configuration of the block.

  

• Ideal current — The block outputs the Simulink signal as a current signal i(t) in the SimRF environment. When you choose this option, the following figure illustrates the internal configuration of the block.

  

• Power — The block uses the Simulink signal, v_SL(t), to output an available power of |v_SL(t)|² to a matched load. When you choose this option, in addition to a voltage source, a series impedance appears internally, as shown in the following figure.

  

  The voltage v(t) is a scaling of the Simulink signal v_SL(t):

  

  In the preceding equation, Z_s is the value of the Source impedance (ohms) parameter.

  The generator delivers a real power to a load Z_l:

  

  When Z_l = Z_s^*, this generator delivers the available power |v_SL(t)|².

Source impedance (ohms)

When Input is set to Power, specify a source impedance. When you use multiple SimRF Inport blocks as power sources at the same node in a given circuit, each block modifies the load for other components connected to that shared node, so the maximum available power is not achieved.

Carrier frequencies

Enter a vector of carrier frequencies whose elements are a subset of the frequencies specified in the SimRF Parameters block. Specify the units from the corresponding drop-down list. The default value of this parameter is 0 Hz.

Ground and hide negative terminals

Select this check box to internally ground and hide the negative terminals of the block. Clear the check box to expose the negative terminals, allowing you to connect them to other parts of your model. By default, this check box is selected.

Examples

The demo Two-Tone Envelope Analysis Using Real Signals shows how to use SimRF Inport and SimRF Outport blocks to position an RF system as part of a larger workflow.

See Also

Continuous Wave | SimRF Outport

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