Patent ID: 9660590
Date: 2017-05-23
CPC Classifications: H02M,H03F

Claim:
1. A charge pump having a plurality of transfer control switches (“TCSwitches”) coupled to one or more transfer capacitors, such that in a first state of the TCSwitches charge is transferred from an input supply to a transfer capacitor, and in a second state of the TCSwitches charge is transferred from the transfer capacitor to an output supply, the charge pump including a charge pump clock whose output controls the switches, the charge pump clock being a ring oscillator comprising: a plurality of ring oscillator inverter stages coupled together in a ring whereby each inverter stage has an input coupled to an output of an immediately preceding inverter stage and an output coupled to an input of an immediately subsequent inverter stage; wherein: the charge pump clock output is substantially sine-like, and a transfer control switch of the plurality of transfer control switches comprises: wherein the active biasing resistor comprises: