Continue to Site

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.

Register Log in

PLL Problem {help me}

Status
Not open for further replies.
E

elec350

Full Member level 4
Joined
Dec 17, 2006
Messages
199
Helped
1
Reputation
2
Reaction score
0
Trophy points
1,296
Location
Iran
Activity points
2,548
hello
I have designed a discrete PLL; but it doesn't work properly. Its charge pump output has only a DC level equal to the charge pump power supply. what's the problem? how i can solve it?
 

There may be many reasons of this problem.If you supply reference signal and oscillator signal properly, check the programmation and PLL lock filter.
Feedback may be not properly provided by oscillator or programmation can be wrong..etc.
If chrage pump is closed to Vdd, input frequency may be very low than expected or programmation is not loaded into the PLL IC..
 

    E

    elec350

    Points: 2
    Helpful Answer Positive Rating
Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top