FM modulating a simple PLL

[vco96]

FM modulating a pll

I'm not an expert in frequency synthesis, but it is possible to FM modulate a simple phased locked loop. The FM would have to be up to 20 KHz just for audio frequencies.

Thanks.

 

[E-design]

Re: FM modulating a pll

If the loop constant is fairly slow (long time to lock) you will be able to modulate the (vco) frequency without the loop losing lock. Attachment shows a typical design.

 

[springf2000]

Re: FM modulating a pll

why not use the mixer?

 

[hf2050]

Re: FM modulating a pll

Mixer ?
For Wide Band FM, how ?

 

[vco96]

Re: FM modulating a pll

If you FM modulate the reference oscillator would the pll still lock?

Thanks alot.