I am new to PLLs and am trying to use one to generate a frequency ramp between 5.725 GHz and 5.875 GHz. I have found tools online that help design loop filters for PLLs, and all of these tools require that the user know the desired loop filter bandwidth and phase margin. I have not been able to find suggestions for choosing filter bandwidth. Also, I understand that filter bandwidth and phase margin are related, but I don't know how to choose appropriate values for them for this application.
A PLL uses integration to eliminate steady state phase error in a stable input. Whereas with a ramp f input, there is a gain-dependant fixed phase-error ( as well as other variables)
Not having done FMCW RADAR before, may I refer to an excellent article.
It defines all the variables that affect BW , settling time and fixed phase error which is an indicator of Spectral Density noise BW that contributes (error and ) has both 1st and 2nd order sensitivity.
If the link does not work , search..
Phase Noise Modeling for Integrated PLLs in FMCW Radar
Frank Herzel, Arzu Ergintav, and Yaoming Sun