Patent ID: 7122997

Claim:
A low voltage reference circuit comprising: first and second Bipolar Junction Transistors (BJTs) each having an associated operating current and having interconnected bases coupled with a common node; a first resistor having first and second terminals, the first terminal coupled with an emitter of the first BJT transistor; first and second Field Effect Transistors (FETs) having interconnected gates and interconnected sources; a current-differencing amplifier having first and second input terminals and an output terminal, the first input terminal coupled with a collector of the first BJT, the second input terminal coupled with a collector of the second BJT, and the output terminal coupled with the interconnected gates of the first and second FETs, wherein a difference in operating currents of the first and second BJTs results in a corresponding output voltage at the output terminal; voltage regulating circuitry coupled with a drain of the first and second FETs and the second terminal of the first resistor; whereby the voltage regulating circuitry minimizes the voltage difference between the drain of the first FET and the drain of the second FET; a second resistor having first and second terminals, the second terminal coupled with the drain of the second FET; and a third BJT having a base, a collector, and an emitter, the emitter coupled with the first terminal of the second resistor and the base coupled with the collector.