Regulator with variable capacitor for stability compensation

Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...

Reexamination Certificate

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C323S274000, C323S273000

Reexamination Certificate

active

07088082

ABSTRACT:
A voltage regulator with a variable compensation capacitor is capable of driving a large variable dynamic current load. The regulator includes an error amplifier and an output stage amplifier. The variable compensation capacitor is disposed between the output terminal of the error amplifier and the output terminal of the output stage amplifier. In one embodiment, a NMOS transistor is disposed between the output terminal of the output stage amplifier and the variable compensation capacitor. The variable compensation capacitor may be, e.g., a PMOS transistor with the source and drain tied together. In one embodiment, a plurality of regulators is included on chip, e.g., such as a programmable device, where the output terminals of each regulator is tied together and used to drive the same load.

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Gabriel A. Rincon-Mora et al., “A Low Voltage, Low Quiescent Current, Low Drop-Out Regulator”, IEEE Journal of Solid State Circuits, vol. 33, No. 1, Jan. 1998, pp. 36-44.
Ka Nang Leung et al., “A Capacitor-Free CMOS Low-Dropout Regulator With Damping-Factor-Control Frequency Compensation”, Journal of Solid State Circuits, vol. 38, No. 10, Oct. 2003, pp. 1691-1702.

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