Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics 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.

Looking for PLL reference design

Status
Not open for further replies.

Death

Newbie level 4
Joined
Oct 3, 2007
Messages
5
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,318
Could anyone provide some references for lock detector circuit for the variable frequency input .
 

northeast1

Full Member level 2
Joined
Jun 21, 2007
Messages
147
Helped
4
Reputation
8
Reaction score
0
Trophy points
1,296
Activity points
1,812
Re: PLL reference

Death said:
Could anyone provide some references for lock detector circuit for the variable frequency input .


Please google the LOCK detector of PLL, you can find the analog method and digital method, analog mathod will detect the differenct of PFD out put, and digital method will open a window.
 

stoned

Member level 3
Joined
Feb 23, 2006
Messages
55
Helped
7
Reputation
14
Reaction score
2
Trophy points
1,288
Activity points
1,606
Re: PLL reference

A Simple Precharged CMOS Phase Frequency Detector
 

rania_hassan

Advanced Member level 4
Joined
Apr 29, 2005
Messages
104
Helped
9
Reputation
18
Reaction score
1
Trophy points
1,298
Location
Egypt
Activity points
1,764
Re: PLL reference

For Lock Detector
just use xor gate with inputs up & down (PFD outputs) if the PLL at lock the up & down will be identical & the Xor will stick to 0 other wise the Xor will toggle
you can use DFF & samples the XOR out with the reference frequency
best regards,
Rania
 

dinesh agarwal

Full Member level 3
Joined
Oct 20, 2007
Messages
151
Helped
4
Reputation
8
Reaction score
1
Trophy points
1,298
Location
Hyderabad India
Activity points
2,074
PLL reference

phase frequency detector is used with narrow width reset pulse there are some architerct available
baker book useds very fine PFD
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top