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

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 ,

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

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

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:

http://www.semiconductors.philips.co...otes/AN179.pdf

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

http://www.semiconductors.philips.co...otes/AN178.pdf

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

http://www.semiconductors.philips.com/pip/SE564N.html and here:

http://users.telenet.be/educypedia/electronics/pll.htm

rgds
unkarc