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Another mitigation technique is to set the splitter to being noiseless as shown here:

The results show that the output noise matches the input noise for this passive system when the splitter is made Noiseless. Use this mitigation technique with caution.

Noise Power Annotation

Caution is warranted in the use of the NOISEPSD annotation in system diagrams where multiple noise sources are being combined. The noise annotation at the output shows a noise density value of -159 dBm/Hz where as in the graph, then noise density is -162 dBm/Hz (spectrum is using a 1 MHz RBW value). The annotation shows a 3 dB offset.