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

can u suggest a simple ChargePump PFD (20MHz) ?

Status
Not open for further replies.
yolande_yj

yolande_yj

Full Member level 3
Joined
Jan 20, 2005
Messages
152
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,296
Activity points
1,647
I am looking for a simple charge pump PFD to build a PLL at 20MHz. The one from TI (TLC2932A) is too simple that it has no control of the CP output current. Then I found some chips from ADI, they can be programmed to set different CP output current, but I don't want to programme it. I just want a fixed CP output current whatever value it is. Can someone suggest a chip to me? Thanks.
 

A simple architecture would suffice for most of the applications. CP programming is only needed for switching different frequency ranges. Hence the normal Charge pump + PFD should do for your frequency application.
 

    yolande_yj

    yolande_yj

    Points: 2
    Helpful Answer Positive Rating
Vamsi Mocherla said:
A simple architecture would suffice for most of the applications. CP programming is only needed for switching different frequency ranges. Hence the normal Charge pump + PFD should do for your frequency application.
Click to expand...
But when designing the LPF, we need the CP current to calculate the PFD gain, am I right?
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top