Marvell International Limited

Chih-Kai Kang

Pierte Roo

Wyant Chan

A voltage regulator includes a supply filter, a bias filter, and first and second circuits. The supply filter is configured to operate from a supply voltage, and to generate a filtered supply voltage at a first node. The supply filter includes a transistor and a capacitor. First and control terminals of the transistor receive the supply voltage. A second terminal of the transistor and a first terminal of the capacitor are connected to the first node. The first circuit is configured to operate from both the supply voltage and the filtered supply voltage, and to generate a second reference voltage based on an input reference voltage. The bias filter is configured to generate a filtered second reference voltage based on the second reference voltage. The second circuit is configured to operate from the filtered supply voltage, and to generate a regulated voltage based on the filtered second reference voltage.

Voltage regulator with positive and negative power supply spike rejection

A voltage regulator includes a master circuit, first and second filters, and a slave circuit. The master circuit provides a second reference voltage based on a first reference voltage and a supply voltage. The first filter provides a filtered second reference voltage based on the second reference voltage. The second filter provides a filtered supply voltage based on the supply voltage. The slave circuit provides a third reference voltage based on the filtered second reference voltage and the filtered supply voltage. The second filter includes an NMOS transistor and a capacitor. The gate and the drain of the NMOS transistor receive the supply voltage. A first terminal of the capacitor is electrically coupled to a source of the NMOS transistor. A second terminal of the capacitor is electrically coupled to ground. The source of the NMOS transistor provides the filtered supply voltage.

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San Jose, CA, United States of America

Chih-Kai Kang