How does RFSA Measures power

- April 28, 2025 at 6:04 am
  
  Jay
  Subscriber
  
  Hi, I want to understand how does the RFSA measures power. In the circuit I have a TIA whose output is connected to a oscilloscope (OSC) and a RF spectrum analyzer (RFSA). Can someone please explain how the outputs from OSC and RFSA are related? What formula is used to calculate the power in the RFSA? The screenshot of the output part of the circuit along with the OSC and RFSA outputs are given below. The y-axis in OSC and RFSA are in Volt and dBm, respectively.
- April 29, 2025 at 7:44 am
  
  Artemis Karvounis
  Ansys Employee
  
  Hello,
  The spectrum analyzer measures the power spectrum of the input electrical signal versus its frequency. Please see the weblink for more details: https://optics.ansys.com/hc/en-us/articles/360036617853-Spectrum-Analyzer-RFSA-INTERCONNECT-Element
  There you may find how to set up an rfsa properly, it is also included a simple circuit example.
  As far as the oscilloscope is concerned, you may find a similar documentation in the following weblink: https://optics.ansys.com/hc/en-us/articles/360036107054-Oscilloscope-OSC-INTERCONNECT-Element
  Kind regards,
  Artemis