[QUE]fractional freq generation from 26MHz reference?

[pigkiller]

How to generate a exactly fractional frequency from 26MHz reference?
Such as generate a exactly 5.14MHz from 26MHz reference?
urgently.
regards.

 

[swicap]

use fractional -n pll

 

[pigkiller]

swicap,
fractional N pll can't gennerate stable fractional frequency, just frequency vary around the center of the fractional freq what i need.
Ask gain, anybody help?

 

[aProgrammer]

Divide 26MHz by 2600 = 10kHz

with a PLL, multiply by 514 = 5.14MHz

 

[RFDave]

How stable do you need this to be? A Fractional N or a DDS could be the way to go. Using an integer N, you would use a reference frequency of 20 kHz. This is quite achievable, assuming you don't need a fast lock time.

Dave
www.keystoneradio.com

 

[swicap]

swicap,
fractional N pll can't gennerate stable fractional frequency, just frequency vary around the center of the fractional freq what i need.
Ask gain, anybody help?

no, frac-n pll output is stable, if u set proper pll bandwidth to supress noise from
multi modulus divider.