In Genesys 2006.07, how do I designate an LO frequency that will take my RF to an intermediate IF frequency, and not baseband?
For example, I want to look at the low side mix of a 5-7 GHz RF, 2-4 GHz IF, and check spurs for a 9 GHz LO.
For example, I want to look at the low side mix of a 5-7 GHz RF, 2-4 GHz IF, and check spurs for a 9 GHz LO.
However, WhatIF has 2 modes: Synthesis and Analysis.
The Synthesis mode (All Intermediate Frequencies) uses rigorous math where the input frequency and bandwidth along with the IF bandwidth and LO configuration are used to determine a valid range of IF frequencies. For example, if the LO configuration was a 'Difference' IF frequencies could only be below the LO or input frequency range. For a Sum LO configuration the IF frequencies must be greater than the LO or input frequencies.
The Analysis mode (Single Intermediate Frequency) is the traditional spur search. This sounds like what you want.
Select 'Single Intermediate Frequency' and set the 'IF Center Frequency' to 3 GHz. On the 'Inputs' tab the mixer should be set to 'Difference - High Side LO'. The RF Center frequency should be set to 6 GHz with a 2 GHz bandwidth. I chose to set the 'IF Bandwidth' to 1 GHz ... but I am not sure this is what you want. Once you click 'Apply' you will see the 9 GHz LO frequency in the window at the bottom of the 'Inputs' tab page. Now you can see the configuration is what you are after. You will also see the output spectrum on the graph.
You can zoom out on the graph to see all of the data if you are zoomed in.