Re: About C/N of VCO
Hi,
About the C/N, as far as I know it has to be measured in closed loop. I don't think it is possible to measure it in open loop. About the filter, this dependes with what equipment do you make the measurement. If you are using a spectrum analyzer which will usually be used then look at RBW (resolution bandwindth). The RBW will actually define your noise floor. Now previously I told you to measure the noise with carrier and without it. Now, I don't think you will be able to do that. So you can measure like you said at a certain distance from the carrier. Don't forget to mention C/N @ offest 160Hz.
Enjoy,
RF_Router