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hello,jcpu said:It's common to deploy GM-C structure in <100MHz oscillators,
and oscillation freqency is usually controlled by tail current.
safwatonline said:hello,
i have another question, y using ICO (i thought it was called CCO) in the first place (i.e. what is the adv. over VCO, as it seems weired to me to convert current Ipump to Vc then Vc to current again )
anyway i found this and i thought it might help.
Hi, safwatsafwatonline said:hello,jcpu said:It's common to deploy GM-C structure in <100MHz oscillators,
and oscillation freqency is usually controlled by tail current.
about GM-C what i understand is that it is a gm cell followed by a cap (filter) is this right?? , if this is right then the GM-C is used instead of the CP (plz correct me if this is wrong), then do i add another V/I after the filter (if i want to use ICO ), if so what is the diffrence between 1st and 2nd V/I cells?
sorry for the long question, but plz help as i am working in this part specially.
thnx and regards,
a.safwat
hello sixth,sixth said:Hi, safwat
I think the first gm-c filter is function as a loop filter to replace the chargepump and loop filter in traditional PLL. The second Gm cell just to convert the voltage from the gm-c filter into current which you use to controll the oscillator.
By the way, why use a ICO? Do this kind of oscillator or PLL has better phase noise performance than traditional one?
sixth