Differential vs. SIngle ended Charge Pump

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Engineer4ever

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HI,

I am designing a differential charge pump, but I was thinking if it's right to use two single ended charge pumps instead of a differential charge pump, beacuse I don't want to use a CMFB circuit, so I am thinking to use two single ended charge pumps; one with input UP and DOWN and the second with input UP-BAR and DOWN-BAR, and each charge pump output will be connected to a loop filter and the outputs of the loop filters will be the differential input of the ring VCO. Is that correct?
 

'Charge pump' suggests you are making a voltage multiplier built from diode-capacitor (Villard) cells.

'Single-ended' suggests you are driving it from pulsed DC.

It is possible to do this, although you will need more stages to obtain a given output, whereas an AC supply would require fewer stages.

It is even possible to create a negative charge pump from DC pulses.
 


Alright, got it. Thanks for your answer
 

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