Low drop-out voltage regulator with common-mode feedback

Details Low drop-out voltage regulator with common-mode feedback Low drop-out voltage regulator with common-mode feedback

2008-01-29

2008-01-29

Laxton, Gary L (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

Reexamination Certificate

active

07323853

ABSTRACT:
The present invention is a LDO voltage regulator circuit with common-mode feedback. The LDO voltage regulator includes an error amplifier with a common-mode feedback unit, a pass device and a compensation circuit. A signal from the pass device acts as an input signal to the error amplifier and is compared with another input signal, producing a differential signal. The differential signal is amplified and then provided to the pass device. A capacitor in the compensation unit provides frequency compensation to the LDO voltage regulator. The common-mode feedback unit incorporated into the error amplifier greatly improves a slew rate of a gate voltage of the pass device.

REFERENCES:
patent: 5939867 (1999-08-01), Capici et al.
patent: 6703816 (2004-03-01), Biagi et al.
patent: 6774722 (2004-08-01), Hogervorst
patent: 6917187 (2005-07-01), Okubo et al.
patent: 7053712 (2006-05-01), Bonaccio et al.
Opamps With Local Common-Mode Feedback; Jeffrey Harrison; Aug. 7, 2001.
Simple Technique Using Local CMFB to Enhance Slew Rate and Bandwidth of One-Stage CMOS OP-Amps: J. Ramirez-Angulo and M. Holmes; Electronics Letters; Nov. 7, 2002, vol. 38, N. 23.

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