Voltage regulator

Details Voltage regulator Voltage regulator

2005-11-15

2005-11-15

Han, Jessica (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

C323S274000

Reexamination Certificate

active

06965218

ABSTRACT:
A voltage regulator includes a two-stage feedback circuit for driving a controller formed by a transistor10.The feedback circuit includes an error amplifier30and an output amplifier20,a simple compensating circuit in the form of a resistor RSZinserted between the inverting input22and the non-inverting input24of the output amplifier20resulting in a high phase reserve of the feedback circuit. The resistor RSZlimits the gain of the error amplifier30for small load currents by reducing its effective output impedance. This compensating circuit results in the two-stage feedback circuit being highly stable even when very low load currents are involved. This now makes it possible to achieve a very simple linear voltage regulator architecture totally integrated on a single chip. It is especially in battery-powered handhelds such as e.g. mobile phones or electronic organizers that this is important since these devices are often on standby with a low current consumption and activated for use only occasionally.

REFERENCES:
patent: 5672959 (1997-09-01), Der
patent: 6600299 (2003-07-01), Xi
patent: 6703815 (2004-03-01), Biagi

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