Low-voltage bandgap reference circuit with startup control

Details Low-voltage bandgap reference circuit with startup control Low-voltage bandgap reference circuit with startup control

2006-12-12

2006-12-12

Vu, Bao Q. (Department: 2838)

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

C323S315000, C327S539000

Reexamination Certificate

active

07148672

ABSTRACT:
A bandgap reference circuit (BGRC) that is suitable for low-supply voltage applications outputs an adjustable reference voltage. In an operational mode, main currents flow through diodes and are controlled by a main current generator such that a positive temperature coefficient of a voltage across a resistor compensates for a negative temperature coefficient of a voltage across the diodes. The difference of the voltages across the diodes increases with temperature and is used to generate the main currents having positive temperature coefficients. The BGRC ensures sufficient current flow through the diodes during startup. In a startup mode, a startup current generator outputs startup currents that combine with the main currents and prevent the BGRC from operating at incorrect operating points that would otherwise be stable when insufficient current flows through the diodes. The startup currents are generated when the voltage drop across the resistor is less than a predetermined voltage offset.

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Hironori Bandba et al., “A CMOS Bandgap Reference Circuit With Sub-1-V Operation,” article in IEEE Journal of Solid-State Circuits, vol. 34, No. 5, May 1999, pp. 670-674.

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