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How to implement a FM modulator using PIC?

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redhat

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fm modulation

i want to implement an fm modulator using pic , but i don't know how to
do it,is there any app notes or any available info that could help

thanks in advance
 

Re: fm modulation

Hi

Please elaborate ? what do whant to do :

1) use the pic to control a PLL ? - search google for PLL + PIC
you will find many circuit

2) Use the pic to crate the FM signal (DDS alike )- to slow to do the job

regards

bobi
 

Re: fm modulation

salam:
i think you have to use pwm to build your project.
matelda
 

Re: fm modulation

thank you all for your help, i have another question . can i generate a
sine wave using pic and sweep over a range of frequencies? and how
to sweep?
thanks in advance
 

Re: fm modulation

Hi

Yse you can, you can make use of a counter to increment from 0 to 255, using a port as the output, and convert it to analog using R-2R resistor configuration.

Changing the frequency might be as simple as how much fast you count.

Regards
 

Re: fm modulation

Well, if you ask for "pure" sine wave the answer is NO!!!

Whatever you do it will be only so called "modified sine wave" and in many application it is enough.
Also, frequency runge is not unlimited.

So, if you are after 100% sine shape PIC is not the right device..
 

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