voice fm modulation using ad9954 at 157MHZ?

[7rots51]

ad9954 fm

Is this possible to voice fm modulation using ad9954 and micro and adc at 157MHZ ?

Is there any spur and interference with other channels ?(ch BW=25khz)

if yes,how to remove interference ?

 

[FvM]

You get some spurs of the modulation sampling frequency, that can't be filtered, cause you get a stepped frequency variation. It could be at best reduced by using Linear Sweep rather than Single-Tone Mode or increasing the sampling frequency.

 

[7rots51]

how much sampling rate is enough?

Is there any other method for FM digital mod of voice?

 

[FvM]

how much sampling rate is enough?

I don't know. You can do a numerical simulation of the sampled voice signal and FM and determine the resulting spectrum.

 

[7rots51]

You can do a numerical simulation

In what softwares I can do the simulation?

 

[7rots51]

I fm modulated a 1KHZ sound with 8khz deviation at ad9957 ,in that freq,I saw spurs at 3MHZ space relative to carrier and -60dbc.

this spur have no problem for me.what is your idea? is another problem?

 

[FvM]

I think, it should work this way.