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Audio amplifier circuit and electronic apparatus including the same

  • US 8,363,856 B2
  • Filed: 12/13/2007
  • Issued: 01/29/2013
  • Est. Priority Date: 12/22/2006
  • Status: Active Grant
First Claim
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1. An audio amplifier circuit for amplifying an input signal to produce an output signal for driving a load, wherein said circuit is configured to operate:

  • in a first mode when directly driving an audio output transducer andin a second mode when driving a line input of an external amplifying apparatus, wherein the output signal produced in the second mode has a higher voltage amplitude for a given signal content than the output signal produced in the first mode;

    wherein the circuit comprises common output stage circuitry for use in both modes, and a dual mode power supply circuit for supplying said output stage in the first mode with a lower supply voltage than in the second mode.

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