MATLAB: Does the “Mixer” block from the RF Blockset 2.3 (R2008b) not change the center frequency of the input signal

RF Blockset

When I use the "Mixer" block, it adds noise to input signal, but does not change the carrier frequency. Why is there no "mixing"?

Best Answer

The "Mixer" block is intended to model the noise present of a physical mixer. It is not intended to perform any frequency conversion.

If you wish to up or down convert, multiply the signal by a sinusoid of the desired frequency and filter appropriately.

Look at the attached example that illustrates how Simulink world interact with the RF world. If you change the frequencies of the input sine waves, that might help understanding how the Mixers work.

Related Solutions

MATLAB: Where can I find more information about the implementation of the General Mixer block in RF Blockset 1.0.2 (R14SP1)

This enhancement has been incorporated in Release 14 Service Pack 3 (R14SP3). For previous product releases, read below for any possible workarounds:

In the attached model, by placing a filter after the output port (IF port) of the mixer, you can see that the RF Blockset has "tagged" the complex baseband representation as being centered at the IF frequency (300 MHz, in this case).

Although the block is called General Mixer, it actually models both a mixer and its corresponding local oscillator (LO).

MATLAB: How To Simulate Mixer Spurs with Just IMT Data

Please follow the workflow in the demo:

edit rf_freeIFbandwidths

Best Answer

Related Solutions

MATLAB: Where can I find more information about the implementation of the General Mixer block in RF Blockset 1.0.2 (R14SP1)

MATLAB: How To Simulate Mixer Spurs with Just IMT Data

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