Texas Instruments Corporation

Shifeng Zhao

Cetin Kaya

Lars Risbo

Venkateswar Reddy Kowkutla

Sreenath Unnikrishnan

Kenneth M Bell

Luis Eduardo Ossa

Lieyi Fang

Claus Niels Neesgaard

James Teng

Jeff Berwick

Anker Josefsen

A system and method is provided for driving an output transistor. The system and method employ a sense control to adjust a drive strength associated with driving the output transistor. The sense control measures an output parameter of the transistor, and adjusts the drive strength based on the measured parameter. The drive strength can be based on a selected driver of a plurality of driver devices with varying drive strengths or selected output devices of a driver of a plurality of output devices of varying drive strengths. The drive strength of the driver devices or output devices can be varied by varying the channel widths of output drive devices selectively coupled to a drive terminal (e.g., gate, base) of the output transistor.

Systems and methods for driving an output transistor

A system and method is provided for detecting an over-current condition in a power field-effect transistor (FET). In one embodiment, an over-current detection circuit for detecting an over-current condition in a power FET comprises a current generator circuit operative to generate a reference current and a plurality of matched FETs operative to receive the reference current and provide a reference voltage, the matched FETs being matched to each other and to the power FET. The over-current detection circuit also comprises a comparator operative to measure a drain-to-source voltage of the power FET and to provide an output that indicates that the drain-to-source voltage of the power FET has exceeded the reference voltage.

Over-current detection for a power field-effect transistor (FET)

A digital amplifier includes a noise shaper and a dither generator arranged to introduce noise to the shaper. The generator uses a seed value derived from a state variable of the shaper.

Amplifiers

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Plano, TX, United States of America

Shifeng Zhao