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What's the function of limiter stage in NE564 PLL IC?

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Abu Ammora

Abu Ammora

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Does anyone have experience with NE564 PLL IC ,After Viewing its Datasheet i faced some problems to understand functions of each of its block Diagram , So i will start to ask about block after another ,

First , There's a limiter Stage , What is its function & its application ?

I uploaded also the Schematic ,
 

Re: NE564 Schematic

Hi,

I do not have experiment with your PLL IC but its limiter stage must be fulfilling the same task a 'normal' circuit limiter does: its differential output voltage is clamped by the diodes hence the phase comparator is happy to work with a nearly fixed amplitude voltage (in fact it can still increase or decrease a little as the input does because of the 900 Ohm common collector resistance).

rgds
Gyula
 

    Abu Ammora

    Abu Ammora

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Re: NE564 Schematic

Thanks , But Can u give me a Quick Description of the function of each component in The Limiter Stage ?
 

Re: NE564 Schematic

Well... the individual blocks are described in AN179 application note nicely. It is just the circuit description of the NE564 from stage by stage and I do not think that much more detailed description could be given (I think you have to do your own homework for yourself to dig more deeply into the details if these are not enough for you by studying classical textbooks), so see link here:

**broken link removed**

You can find further circuit description on some of the blocks also used in NE564 here:

**broken link removed**

Finally a collection of PLL theory/practice/applications are here:

**broken link removed** and here:

**broken link removed**

rgds
unkarc
 

    Abu Ammora

    Abu Ammora

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