Cirrus Logic Inc.

Simon R Foster

Mark McCloy-Stevens

Gordon James Bates

Kapil Sharma

Peter Hsu

Dipankar Nag

Saurabh Kumar Singh

Rupesh Khare

James Wells

Huy Binh Le

Niall McGurnaghan

Gavin Wilson

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

The present disclosure relates to self-test circuitry for a system that includes one or more current control subsystems, each current control subsystem having a load terminal for coupling the current control subsystem to a load. The self-test circuitry comprises: a signal path associated with each current control subsystem, each signal path configured to selectively couple a measurement node to the load terminal of the current control subsystem, wherein the measurement node is common to all of the signal paths; voltage detection circuitry; and test voltage source circuitry configured to provide a test voltage to the measurement node. The voltage detection circuitry is operable to output a signal indicative of a fault condition if a voltage detected at the measurement node differs from the test voltage when the measurement node is coupled to the load terminal.

Self-test circuitry

This application relates to switch arrangements, in particular switch arrangements suitable for switchable connecting nodes of audio driving circuitry () that may, in use, experience a signal swing depending on an output audio driving signal (V). A switch arrangement () comprises first and second transistors (and) of the same polarity type connected in series between the first and second nodes, with a third transistor () connected between a defined voltage (V) and an intermediate node (N) between the first and second transistors. The first transistor () has a drain connection to the first node (N) and a source connection to the intermediate node (N). The second transistor () has a drain connection to the second node (N) and a source connection to the intermediate node (N). The third transistor () has a source connection to the defined voltage (V) and a drain connection to the intermediate node (N) and regulates the voltage at the intermediate node when the switch arrangement is in an off state.

Switch arrangements

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Reading, United Kingdom

Simon R Foster