Abstract: A rail-to-rail linear current mode charge pump is disclosed, wherein current is sourced to an output voltage load through a current mirroring source device when a first switching device operates. Current is sunk from the output voltage node through a current mirroring sink device when a second switching device operates. An internally generated voltage mirrors the voltage at the output node by means of a rail-to-rail feedback network which operates in such a manner that an input source current IREF splits in such a way that the current pulses sourced to or sunk from the output voltage node are reflected to a first current source device and a first current sink device in series forming a node therebetween representative of the internal voltage node.

Abstract: A prescaler is used for generating an output frequency from an input frequency by fractional division. It comprises a component signal composer (402) arranged to generate a number of parallel component signals that differ in phase from each other. Additionally it comprises a controllable phase selector (403) arranged to respond to a control signal by either selecting a constant number of unchanged ones of the parallel component signals or to repeatedly change its selection among the parallel component signals. The component signal composer (402) is arranged to generate more than four parallel component signals for the phase selector (403) to choose from.