Cirrus Logic Inc.

Peter Hsu

Kapil Sharma

Mark McCloy-Stevens

Gordon James Bates

Simon R Foster

Dipankar Nag

John Bruce Bowlerwell

Kathryn Rose Holland

Matthew Petherbridge

This application relates to methods and apparatus for sensing current in a monitored current path, where the monitored current path is bidirectional such that current can flow in either direction along the monitored current path. A current sensor has first and second sense resistors () configured to each pass a current corresponding to the current in the monitored current path. The first and second sense resistors are configured to have a matching arrangement, such that current flow through the first sense resistor when current is flowing in one direction in the monitored current path matches current flow through the second sense resistor when current is flowing in the opposite direction in the monitored current path.

Current sensing

The present application relates to current sensing circuitry () that comprises a differential amplifier () comprising first and second inputs configured to sense a current across a sense resistance, and an output configured to output a current sense signal. The circuitry () further comprises a first current source, a second current source and a switch network operable in: a first phase in which the first current source is connected to the first input and disconnected from the output, and the second current source is connected to the output and disconnected from the first input; and a second phase in which the first current source is connected to the output and disconnected from the first input, and the second current source is connected to the first input and disconnected from the output.

Current sensing circuitry

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Edinburgh, United Kingdom

Peter Hsu