Clarification on IM3 measurement of high-power amplifiers
I am measuring IM3 in the lab where I applied 2 tones of equal power into our Tx chain. When comparing Pout (total output power) vs IM3, I am unsure if it is against the total output power of the 2 tones
the power of one of the two tones (approx. 3dB minus the total power). In two tone measurements you have other products (F2-F1, 2*F-F2 (IM3), 2*F2-F1(IM3), F1+F2, etc.), that aren't present in a one tone test with a power equal to the total power of the two tones.
Thanks in advance.
Unless requested otherwise, when performing two-tone measurements, I explicitly state that input/output power is "per tone"; I also note the tone spacing and that the IM products are "relative to one of two equal tones X MHz apart". I typically only use total power in efficiency calculations.
Spectrum analyzers typically put their markers on the tones, not the imaginary point 3dB higher, when displaying IM data. Saves a lot of mental math and confusion.
Sign in or register to add a comment.
Add a Comment
About Our Site
Biological Effects and Applications
Computer Aided Design
Emerging Applications and Technology
Filters and Passives
MMIC and RFIC
Packaging and Materials
Sources and Receivers
Test and Measurement
Any article/paper on use of high frequency signals ( up to 100Mhz) on General purpose connector?
Max. Power dissipation per unit area of thin film materials
Steps for connecting Femal-to-Female adaptor into a male connector in the RF measurement equipment
MW Power divider (WPD, GPD), Bandwidth extension techniques
Terms of Service
Useful Hints and Tips
Created with PlushForums
© 2023 Microwaves 101 Discussion Board