Precision reference current generator

Abstract

An integrated current generator circuit operates in conjunction with a known reference voltage and internal and external reference resistances. The current generator circuit includes three operational modes. In the first operational mode, the reference voltage is impressed upon the internal reference resistance to generate one or more relatively inaccurate output currents. In a second operational mode, the reference voltage is impressed upon an external reference resistance to generate one or more highly accurate output currents, even if an internal ESD resistor is used, or if the bonding pad has high series parasitic resistance. An alternative voltage sensing path is included to ensure the accuracy of the reference current. In a third operational mode, the reference voltage is again impressed upon the internal resistance, with the corresponding node voltage being connected to an external integrated circuit bonding pad.

Dependencies are inferred from the claim text.