FM modulating a simple PLL

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vco96

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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.
 

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.
 

Re: FM modulating a pll

why not use the mixer?
 

Re: FM modulating a pll

Mixer ?
For Wide Band FM, how ?
 

Re: FM modulating a pll

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

Thanks alot.
 

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