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Where To Find This Example

Select Help > Open Examples... from the menus and type either the example name listed above or one of the keywords below.

Or in Version 13 or higher you can open the project directly from this page using this button. Make sure to select the Enable Guided Help before clicking this button.

Design Notes

This project shows how to use the RFB VSS Carrier to IM3 ratio measurement (dBc). Please read the measurement help for C_IM3.

The graph "C_IM3 dBc shows the ratio of the carrier power to the third order itermodulation product.

If you look at the 2nd row of the graph "P_node of signal and IM3" you will see the 2nd column is -41.302dBm and that the 3rd column is 2.849dBm. -41.302dBm is the power level of the IM3 product and 2.849dBm is the power of the main signal (carrier).

2.849 - (-41.302) is IM3_dBc.

Also you can see a plot of power in vs. power out.

System Diagram - C_IM3 measurement

Graph - P_node of signal and IM3

x Data (Text) DB(|P_node(TP.IN1,TP.OUT1,3,1,0)|)[1,6] (dBm) C_IM3 measurement IM 3 Product Node Power, dBm Freq = 1 GHz PWR = -7 DB(|P_node(TP.IN1,TP.OUT1,0,1,0)|)[1,6] (dBm) C_IM3 measurement Signal - peak if DC, rms otherwise Node Power, dBm Freq = 1 GHz PWR = -7
TONE (A4@1) -370 -7
AMP_B (A3@2) -41.3024 2.84899

Graph - C_IM3 dBc

DB(|C_IM3(TP.IN1,TP.OUT1,0,2,1,0)|)[1,6] C_IM3 measurement Text DB(|C_IM3(TP.IN1,TP.OUT1,0,2,1,0)|)[1,6] (dB) C_IM3 measurement Absolute IM3, dB Freq = 1 GHz PWR = -7
AMP_B (A3@2) 44.1514

Graph - Power in vs Power out