Integer-N vs Fractional PLL [hlp]

it will depend on the application. and channel spacing and BW requirements of the PLL. in some cases the design requirements forces u to use the fractional N which is more compalex and need Sigma Delta modulators and so on

so it will depend on ur requirements

khouly

hello
khouly wrote:
pls explain more? Is programming of a fractional PLL IC more complex than an integer-N PLL?

the design is more hard , the programing is not a big deal

if u have 2 IC's one integer and the other is fractional it will be simple to use any one of them

the main problem is in the design the PLL chip

Khouly

there must be a fixed reference frequency for integer-N PLL,
While the fractional-N PLL can work with more reference.
So I think the reference frequency is the factor which detemines you choise.