I have a signal which is thermally occupied. The signal is filtered with an cavity, therefore the noise spectrum is simply a Lorentzian function. I was wondering what would be the resulting noise floor on a square law detector (V ~ P2). Will the signal to noise ratio just be the square of signal power / integrated noise spectrum? I am asking this since I think there should be a beating between different frequency components of the noise. Shouldn't that increase the noise floor? If so, how can it be derived? Can anyone provide literature on that?
In my opinion, to observe noise beats the “frequency components” of the noise should be phase-locked. However, it is usually assumed that noise phases are random.
On the other side a frequency modulation can arise because of parametric amplification of an unwanted signal, which can be called noise as well. Both problems have been faced from a classical viewpoint at radio frequencies, for instance:
http://www.pa.msu.edu/~edmunds/Parametric_Amplifier/parametric_amplifier_some_notes_on_history.pdf
- Badges
- Science topic
- Similar topics
- Engineering
- Electrical Engineering