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a Charge Pump question

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swicap

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A Charge Pump often use a opamp to eleminate charge sharing.

so, what is the relationship between the opam Unit Gain BandWidth and PLL Loop
Bandwidth(closed loop -3db)?

Thanks.
 

i guess it mst be bigger

Added after 40 seconds:

i mean OP-amp 3dB BW > closed loop BW
 

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