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H-lock PLL
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mitgrace



Joined: 08 May 2004
Posts: 366
Helped: 4
Post05 Jan 2008 3:58   

H-lock PLL
Dear All :
DOes any work on H-lock PLL ,the video applcaition ? Now I have some problems about that , The reference is 10k ~60KHz. we see some product is no loop flter , how do they do that ?? Thanks
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ce



Joined: 08 Jan 2008
Posts: 10
Helped: 2
Post11 Jan 2008 11:23   

H-lock PLL
They probably use an integrated charge pump to integrate the error signal of the phase detector. Since an integrator has a LP behaviour, choosing the right integrating constant (C/gm) results in a stable loop.
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