Patent ID: 8049541

Claim:
A charge pump comprising: pull-up circuitry that comprises a current source and a controlled transistor having a gate adapted for connection to a first input signal for being controlled thereby, the pull-up circuitry electrically connected between a positive voltage supply and a charge pump output node; pull-down circuitry that comprises a current source and a controlled transistor having a gate adapted for connection to a second input signal for being controlled thereby, the pull-down circuitry electrically connected between a ground voltage supply and the charge pump output node, the first and second input signals being derived from up and down signals, respectively; a reference current source; a plurality of programmable transistors that comprise pairs of transistors in series, both the reference current source and the plurality of programmable transistors each configured to control the current in at least one of the current sources of the pull-up and pull-down circuitries, and each of the pairs of transistors comprise a switch-functioning transistor and a current mirror transistor, and the switch-functioning transistor having a gate electrically connected to a fuse circuit; and a capacitor electrically connected to the charge pump output node.