Bandgap reference circuit

Details Bandgap reference circuit Bandgap reference circuit

2008-04-29

2008-04-29

Lam, Tuan T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Converging with plural inputs and single output

C327S539000, C327S540000, C327S541000, C327S542000, C327S543000, C323S312000, C323S313000

Reexamination Certificate

active

11161789

ABSTRACT:
A bandgap reference circuit, taking two or more power supplies as the input power supply for outputting a reference voltage, includes a first reference circuit, a second reference circuit, a power selection circuit and a switch circuit. The first and second reference circuits receive two respective power supplies for producing first and second voltages, respectively. As the power selection circuit takes the first power voltage level as the input voltage, the power selection circuit outputs a first control signal; while the power selection circuit takes the second power voltage level as the input voltage, the power selection circuit outputs a second control signal. The switch circuit is coupled to the power selection circuit, the first reference circuit and the second reference circuit. As the switch circuit receives the first control signal, it outputs the first voltage; while the switch circuit receives the second control signal, it outputs the second voltage.

REFERENCES:
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patent: 6967611 (2005-11-01), Atriss et al.
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patent: 2003/0211870 (2003-11-01), Jiguet et al.
patent: 2005/0052802 (2005-03-01), Wang
patent: 2005/0099224 (2005-05-01), Itoh
patent: 2005/0174164 (2005-08-01), Fuhrmann et al.
patent: 2006/0284668 (2006-12-01), Chou

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