I'm new RF design, so please bear with me. I have a situation where I want to do FM on one frequency only. I've read a lot about Phase-Locked Loops
, but it seems to me that it's pretty difficult to tune their charge pump filters to get a lock yet not fight with the FM.
My question is if it is feasible to use some sort of a precision voltage reference, divide it to get the voltage for the desired carrier frequency, and sum that voltage with the information signal to feed into the VCO? This is assuming a commercial VCO
, not a homemade Colpitts oscillator. Almost all of the circuits I see out there are either unstable (subject to frequency drift), or use a PLL.
If PLL is the only way to go, can someone recommend a chip that is easy to interface with, and will be good for the 2-meter band?