2-Port Mixer Blocks
Typically, the block diagram of a mixer has three ports, as shown in the following representation of a downconversion mixer.

The mathematical and physical mixer blocks model both a mixer and a local oscillator, so they have only two ports.

The following figure shows the icons of the mixer blocks. The icons of all the mixer blocks show the internal local oscillator.

For the physical blocks, you can use the LO frequency (Hz) parameter to specify the local oscillator's frequency.
For more information, see the individual block reference pages.