Patent ID: 7009313

Claim:
A power supply comprising: a power source providing a source voltage; means for processing the source voltage to generate an output voltage at a Vout node, wherein the output voltage varies from the source voltage; a multiplicity of energy storage devices adapted to individually controllably receive energy from the Vout node; a multiplicity of Vc nodes wherein the multiplicity of energy storage devices are electrically connected between the Vc nodes and ground; and a multiplicity of switches (M 5 a –M 5 t ), each electrically connected between a Vc node and one or more stimulation channels, wherein the switches (M 5 a –M 5 t ) are adapted to selectably connect the Vc nodes to the one or more stimulation channels; wherein the means for processing comprises a switched capacitor circuit comprising a multiplicity of switched capacitors, wherein the multiplicity of switched capacitors are disconnectably connectable in-parallel, wherein the in-parallel multiplicity of switched capacitors are chargeable from the power source, and the multiplicity of switched capacitors are disconnectably connectable in-series.