RF oscillator 4-120MHz

[neazoi]

rf oscillator

Hello,
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?

 

[biff44]

project schematics rf2506

I would mix a fixed 100 MHz oscillator with a 104 to 220 MHz VCO.

 

[mvs sarma]

simplest rf oscillator

Hello,
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 fear a ratio of 1:30 may not be possible

 

[neazoi]

120mhz osilator

>>> 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.

 

[mvs sarma]

site:www.edaboard.com oscillator

>>> 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 transferred to higher frequencies.

Instead, follow a modern method, Direct Digital synthesis, using AD9952 or AD9954

 

[neazoi]

rf oscillator pll

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...

 

[mvs sarma]

max2620 schematic

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

 

[FvM]

vco 120mhz

the circuicity is too complex for a simple project

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.

 

[neazoi]

oscillator schematic 100mhz

the circuicity is too complex for a simple project

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.

Yes, I intend to use this oscillator in conjunction with a flip flop to perform divide-by-four frequency and also 4 output phases. So an output power of around -3 to 0 dbm should be sufficient. Phase noise is not too much of a problem here. It can be even a square wave oscillator. It just have to be so wideband to achieve a frequency of 1-30MHz with 4 differend phases after the division.

 

[Borber]

ad9951 oscillator

Use this project:
http://www.dl5mgd.de/dds/AD9951.htm

 

[FvM]

vco rf-oscillator

A wideband VCO (ring-oscillator) as TI TLC2394 can possibly do, if frequency stability isn't an issue.