Cirrus Logic Inc.

Mehul Mistry

Morgan Timothy Prior

Pradeep Saminathan

Tahir Rashid

Rupesh Khare

Jack Fuller

This invention relates to current sensing, in particular for a signal processing circuit () for outputting an output signal (Sout) based on an input signal (Sin). An output stage () includes an output transistor () driven, in use, by a drive signal. A current monitor () is configured to monitor, in use, a first current through the output transistor, wherein the current monitor comprises a current sensor () having a sense transistor () configured to be driven based on the drive signal so as to generate a sense current related to the first current. A compensation controller () receives an indication of signal level of the input signal and controllably varies operation of the current monitor () so as to at least partially compensate for signal-dependent variation in a relationship between the first current and the first sense current.

Current sensing

Circuitry for detecting a capacitive load coupled between a first node and a second node, the circuitry comprising: drive circuitry for applying a first voltage to a first node over a first time period; processing circuitry configured to: measure a second voltage at the first node; and determine that the load is a capacitive load based on the second voltage.

Method and apparatus for detecting a load

An apparatus for providing an output signal to an audio transducer comprises: one or more signal paths for receiving respective digital audio input signals, applying respective digital gains, and outputting respective amplified digital audio input signals; one or more inputs for receiving one or more volume parameters associated with the digital audio input signals; converter circuitry, coupled to the one or more signal paths, for converting the one or more amplified digital audio input signals into the analogue domain, and outputting an analogue audio input signal; an analogue gain element, for applying an analogue gain to the analogue audio input signal and outputting the output signal; and a control circuit, coupled to the one or more signal paths, operative to select the analogue gain based on a comparison of the volume parameters and the one or more digital audio input signals as multiplied by the volume parameters, and to select the respective digital gains for each digital audio input signal so that an overall gain in the respective signal path corresponds to a volume parameter associated with the respective digital audio input signal.

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Edinburgh, United Kingdom

Mehul Mistry