Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Synthesizer Questions?

Status
Not open for further replies.

liberal

Advanced Member level 4
Joined
Nov 25, 2004
Messages
105
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,296
Activity points
828
I want to build a synthesizer,with a variable PFD Ref Frequency(Fref) and variable integer Divider (N),the PLL output is Fout.
I want to know the relationships between the variable Fref and the variable Divider N.As we know Fout=NFref.But now the N and the Fref are variable,how to cal their ralationships?any references?Thank you!
 

toonafishy

Full Member level 6
Joined
Jun 18, 2002
Messages
369
Helped
38
Reputation
76
Reaction score
12
Trophy points
1,298
Location
Earth
Activity points
3,187
Except for the Fout formula yu gave, there is no relationship between Fref and N. You choose both in order to get the final Fout needed.
 

liberal

Advanced Member level 4
Joined
Nov 25, 2004
Messages
105
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,296
Activity points
828
No.
As we konw if the Fref is constant but the N is variable ,then we can cal the range of N is 171/N---249/N.But now the Fref is variable too,then how to Cal?
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top