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Where to find info about gm cells?

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safwatonline

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hello,
i am in a cdr project and i have two questions:-
1- in dual loop cdr is the gm cell used with the phase detector is just a simple OTA , i cannot find any notes or what so ever about gm cell ,all i can find is about CP only, so if anyone have any knowledge about gm cells it will be great ,also if any pappers or books or... about gm cells (in general or for CDR) is recomended plz dont hesitate.
2- in the dual loop CDR , there is a MUX that switches from the PFD "acquisition" to the PD , i noted that this is a current MUX and not a voltage one , any notes or architectures about current mux's will be great.
thnx alot and regards.
a.safwat
 

safwatonline

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Re: gm cell

hello,
guys are these questions too hard or too easy to answer :cry:
plz helppppppp.
a.safwat
 

eda_freak

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Re: gm cell

Read book Springer publishers CMOS PLL freq. synthesizers...
Its available on this forum
 

vlsiattitude

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Re: gm cell

refer best and gardner book on pll
 

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