How to measure IMD with two tone signals?

[Bo.Yu]

Dear all,

Recently I have watched David Hall's video "Relating IMD and TOI Measurements". It's really good material about how to setup IMD measurement environment, however, I am still confused on how two 10dBm tones (999MHz, 1001MHz) will have a theoretical 60dB loss after passing a passive combiner. Can anyone give me some knowledge about that?

Thanks in advance!

Bo Yu

[ericthemantis · Accepted solution]

I think he says 6 dB of loss. Which is what he sees on the display (both tones are at about 4 dBm).

This is what I could find on it - http://www.radio-electronics.com/info/rf-technology-design/coupler-combiner-splitter/rf-resistive-sp... - a basic 6 dB power splitter / divider.

[Bo.Yu · Accepted solution]

Hi Eric,

Thank you so much for the clarification, and the link about resistive splitter / divider is really useful for me. There is a typo in the subtitle of the video where it writes 60 dB, which should be theoretically 6 dB loss for a passive resistive divider.

Thanks again!

Bo Yu