Audio amplifier performance while maintaining usb compliance and power down protection
AssigneeFairchild Semiconductor Corporation
InventorsJulie Lynn Stultz, Earl Schreyer
Life of this patent
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Abstract
An apparatus comprises a first audio amplifier circuit configured to provide an analog audio signal and an analog switch circuit including a first input configured to receive the analog audio signal, a second input configured to receive a first digital data signal, and a first output configured to provide one of the digital data signal or the analog audio signal. The apparatus also includes a first feedback circuit coupled to the first audio amplifier circuit and the analog switch circuit output, the feedback circuit configured to bias the first audio amplifier circuit.
Claims6
An integrated circuit (IC) comprising:
- a first IC output;
- a first audio amplifier circuit configured to provide an analog audio signal;
- an analog multiplexer (mux) circuit including:
- a first input configured to receive the analog audio signal;
- a second input configured to receive a first digital data signal;
- and
- a first output configured to provide one of the first digital data signal or the analog audio signal to the first IC output;
- and
- a first feedback circuit path from the analog mux circuit output to an input of the first audio amplifier circuit, wherein the feedback circuit is configured to bias the first audio amplifier circuit.
Dependencies are inferred from the claim text.