Patent Number: 8,575,968

Title: Fast power up comparator

Abstract: A circuit method includes periodically increasing a tail current of a differential stage of a comparator to periodically power on the differential stage to a power-on state, and periodically decreasing the tail current of the differential stage to periodically power down the differential stage to a low-power state. The periodically increasing of the tail current and the periodically decreasing of the tail current are asynchronous operations for powering on the differential stage to the power-on state and powering down the differential stage to the low-power state. Periodically increasing the tail current and the periodically decreasing the tail current asynchronously for powering on the differential stage to the power-on state and powering down the differential stage to the low-power state provide for low noise and high speed during signal comparison.

Inventors: Cyrusian; Sasan (Scotts Valley, CA)

Assignee: Marvell World Trade Ltd.

International Classification: H03K 5/22 (20060101)

Expiration Date: 1/05/12017