PLL loop filter for Audio application

[laksaja]

PLL loop filter

Hello to all,

Im just new visitor of this forum regarding to the PLL technology and as far i have looked around in this topic, many interesting points are brang out. Nevertheless, sometimes is not enough for the beginner to "go with a flow" so easily, so i decided to show my construction in 854 - 868 Mhz PLL TX modulation area. Maybe someone can find this schematic useful.
BW is 50 HZ which allows the lower side of the audio pass through. Stepsize has been chozen 25kHz, reference frequency 13mHz. Reference oscillator is most vital unit in PLL construction, so it should (must) be temperature compensated crystal controlled oscillator.
I dont have invested my time to find out phase noise and and other PLL stuff, I just listen the good stereo audio with that construction and that matters . the other image shows the "skeleton" of the completed transmitter.

Good luck to everyone!

 

[yendori]

Re: PLL loop filter

umm, thank you?

 

[sozkarabacak]

Re: PLL loop filter

PLL control software send me? Please

sukruozkarabacak@hotmail.com

 

[noura7]

Re: PLL loop filter

Hello to all,

Im just new visitor of this forum regarding to the PLL technology and as far i have looked around in this topic, many interesting points are brang out. Nevertheless, sometimes is not enough for the beginner to "go with a flow" so easily, so i decided to show my construction in 854 - 868 Mhz PLL TX modulation area. Maybe someone can find this schematic useful.
BW is 50 HZ which allows the lower side of the audio pass through. Stepsize has been chozen 25kHz, reference frequency 13mHz. Reference oscillator is most vital unit in PLL construction, so it should (must) be temperature compensated crystal controlled oscillator.
I dont have invested my time to find out phase noise and and other PLL stuff, I just listen the good stereo audio with that construction and that matters . the other image shows the "skeleton" of the completed transmitter.

Good luck to everyone!

Hi,

Can you please tell me how can you choose BW=50 Hz and stepsize=25kHz? It depends on what for audio applications?
What is the divider value for this design?

Regards,
Noura