| Author |
Message |
elec350
Joined: 17 Dec 2006
Posts: 195
Helped: 1
|
 22 Jul 2008 8:54 Integer-N vs Fractional PLL [hlp] |
|
|
|
hello
which is better? integer-N or fractional PLL?
|
|
| Back to top |
|
 |
khouly
Joined: 20 Oct 2003
Posts: 2444
Helped: 335
Location: EGYPT
|
| 22 Jul 2008 8:58 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
|
|
| Back to top |
|
|
elec350
Joined: 17 Dec 2006
Posts: 195
Helped: 1
|
| 22 Jul 2008 9:01 Re: Integer-N vs Fractional PLL [hlp] |
|
|
|
hello
khouly wrote:
| Quote: |
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 |
pls explain more? Is programming of a fractional PLL IC more complex than an integer-N PLL?
|
|
| Back to top |
|
|
khouly
Joined: 20 Oct 2003
Posts: 2444
Helped: 335
Location: EGYPT
|
| 22 Jul 2008 9:32 Integer-N vs Fractional PLL [hlp] |
|
|
|
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
|
|
| Back to top |
|
|
jecyhale
Joined: 19 Feb 2008
Posts: 402
Helped: 39
Location: China
|
| 23 Jul 2008 8:56 Re: Integer-N vs Fractional PLL [hlp] |
|
|
|
| elec350 wrote: |
hello
which is better? integer-N or fractional PLL? |
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.
|
|
| Back to top |
|
|
