Low voltage low power bandgap circuit

Details Low voltage low power bandgap circuit Low voltage low power bandgap circuit

2006-02-07

2006-02-07

Tra, Quan (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

C327S512000, C327S539000

Reexamination Certificate

active

06995587

ABSTRACT:
Disclosed are methods and circuits for providing a bandgap reference in an electronic circuit having a supply voltage and ground. The methods include steps for generating a bandgap reference current, mirroring the bandgap reference current, summing the mirrored currents, and modulating and outputting a bandgap reference voltage from the sum. Representative preferred embodiments are disclosed in which the methods of the invention are used in providing under-voltage protection and in providing a regulated output voltage. Circuits are disclosed for a bandgap reference voltage generator useful for providing a bandgap reference voltage in a circuit. A first current mirror for provides current from a supply voltage. A bandgap reference current circuit between the first current mirror and ground is configured for deriving a bandgap current proportional to absolute temperature. A second current mirror and control circuit are provided for summing the mirrored currents and modulating a bandgap reference voltage output. Preferred embodiments of the invention include a bandgap under-voltage detection circuit using a comparator and a voltage regulator circuit having a regulated voltage output capability.

REFERENCES:
patent: 4578633 (1986-03-01), Aoki
patent: 6512398 (2003-01-01), Sonoyama et al.
patent: 6690228 (2004-02-01), Chen et al.
patent: 2004/0104763 (2004-06-01), Pai

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