Patent ID: 8228122

Claim:
A regulator circuit maintaining a constant output supply voltage despite receiving power from an input supply voltage subject to variation, comprising: an input receiving the input supply voltage subject to voltage variation; an output providing the constant output supply voltage; a plurality of transistors powered by the input supply voltage subject to voltage variation, the plurality of transistors having turn on voltages, and a sum of the turn on voltages substantially determining the constant output supply voltage, wherein the plurality of transistors powered by the input supply voltage subject to voltage variation includes: a first transistor having a control terminal, a first current carrying terminal receiving power from the input supply voltage subject to variation, a second current carrying terminal coupled to a ground, and the turn on voltage between the control terminal and the second current carrying terminal; and a second transistor having a control terminal, a first current carrying terminal coupled to the output and receiving power from the input supply voltage subject to variation, a second current carrying terminal coupled to the control terminal of the first transistor, and the turn on voltage between the control terminal and the second current carrying terminal.