Patent ID: 6914475
Filing Date: 2005-07-05
Classification: G05F

Abstract:
1. A current generator comprising: supply voltage terminals across which a differential supply voltage is applied; a precision voltage generator coupled to said supply voltage terminals and having a precision voltage terminal from which a precision voltage is derived; and a multiple output current mirror stage coupled to said precision voltage generator, and being operative to supply a plurality of output currents proportional to said precision voltage, said output currents being exclusive of current errors associated with circuit components of said precision voltage generator and said multiple output current mirror stage; and wherein said precision voltage generator comprises a bandgap voltage device that is operative to generate a bandgap voltage, which is derived by way of said precision terminal; and wherein said bandgap voltage generator includes a bandgap voltage current mirror containing a bandgap voltage reference circuit coupled in an input arm of said bandgap voltage current mirror, and being exclusive of a voltage dropping resistor path across which said bandgap voltage would otherwise be provided, and a bandgap voltage replication circuit coupled in an output arm of said bandgap voltage current mirror, and including a voltage dropping resister path coupled to said bandgap voltage to terminal from which said bandgap voltage is provided, said output arm of said bandgap voltage current mirror being operative to generate a bandgap output current proportional to said bandgap voltage.