rf oscillator
In the context of a project I need a schematic for a 4-120MHz oscillator, being vco or L/C, pll or whatever. I need 4-120MHz but also something like 10-120MHz would be fine.
Any ideas please?
I would mix a fixed 100 MHz oscillator with a 104 to 220 MHz VCO.
I fear a ratio of 1:30 may not be possible
>>> I would mix a fixed 100 MHz oscillator with a 104 to 220 MHz VCO.
Yes mixing may be the solution but not there is another problem of how do I find asuitable vco schematic for 104-220MHz
So I think the problem is not solved but rather transfered to higher frequencies.
Instead, follow a modern method, Direct Digital synthesis, using AD9952 or AD9954
yes I have seen these chips and although the circuicity is too complex for a simple project, they are capable of wideband oscillation. But they cannot go up to 120MHz.
RF2506 seems to be a good and simple solution as well as max2620.
I have not found something more straight forward though and I cannof find the RF2506 nowhere...
please reconcile, they CAN work upto 120MHz.
Study the data sheet of AD9952 and 9954
I could try in contrast to suggest an oscillator, that's most likely too poor...
Please consider, that you didn't give any further specification, except frequency range. There may be very different ideas about required frequency stability, phase noise, allowed harmonics, spurious or mirror frequencies (in case of using a mixer) - and acceptable effort. In my opinion, it's more or less senseless to make suggestions in this case.
I could try in contrast to suggest an oscillator, that's most likely too poor...
Please consider, that you didn't give any further specification, except frequency range. There may be very different ideas about required frequency stability, phase noise, allowed harmonics, spurious or mirror frequencies (in case of using a mixer) - and acceptable effort. In my opinion, it's more or less senseless to make suggestions in this case.