charge Pump

Hi all,

Does anybody have any papers,links resources etc on charge pumps as used on a phase detector in a PLL. I know it usually consists of two transistors but anybody have a circuit ?

cheers

Ody

These papers might be useful,

http://www.ece.cmu.edu/~vchandra/projects/pll.pdf
http://www.egr.msu.edu/~waheedkh/pap...ynth_final.pdf

Cross

hi,

You can refer to some application notes in www.national.com