Patent ID: 7075282

Claim:
A low-power bandgap reference circuit, comprising: a voltage supply; a first current source for providing a proportional to absolute temperature (PTAT) current, comprising: a first transistor having a first terminal coupled to said voltage supply, a second terminal providing said PTAT current and coupled to an output terminal of said circuit for providing a bandgap reference voltage, and a control terminal; a second current source for providing a proportional to base-emitter voltage (PTVBE) current, comprising: a first resistor having a first terminal coupled to said voltage supply; and a second transistor having a first terminal coupled to a second terminal of said first resistor, a second terminal providing said PTVBE current and coupled to said output terminal, and a control terminal; and a second resistor having a first terminal coupled to said output terminal, and a second terminal coupled to a common ground, wherein said first current source further comprises: third to sixth transistors each having a first terminal, a second terminal and a control terminal, and having said first terminals of said third and said fourth transistors coupled to said voltage supply, said control and said second terminals of said fourth transistor coupled to said control terminals of said first and said third transistors, said second terminal of said fifth transistor coupled to said control terminal of said second transistor and said second terminal of said third transistor, said second terminal of said sixth transistor coupled to said second terminal of said fourth transistor, said control terminal of said sixth transistor coupled to said control terminal of said fifth transistor, and said first terminal of said sixth transistor coupled to said common ground, respectively; a third resistor having first and second terminals coupled to said first terminal of said fifth transistor and said common ground, respectively; and a fourth resistor having first and second terminals coupled to said control terminal of said sixth transistor, and said common ground, respectively.