Single supply headphone driver/charge pump combination

  • US 7,061,327 B2
  • Filed: 01/24/2002
  • Issued: 06/13/2006
  • Est. Priority Date: 01/24/2002
  • Status: Active Grant
First Claim
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1. An amplifier circuitry for directly driving stereo headphones, said amplifier circuitry being driven by a single supply voltage VDD, said amplifier circuitry comprising:

  • a first and a second amplifier, the first amplifier having an output directly coupled to a first headphone and the second amplifier having an output directly coupled to a second headphone, each of the first and second amplifier having a VDD power supply lead connected to a positive voltage supply VDD; and

    a charge pump circuitry output connected to a −

    VDD supply voltage of the first and second amplifier, wherein said charge pump circuitry output provides a voltage substantially equal in magnitude to the negative value of the VDD supply, said charge pump further having a power supply lead connected to the VDD supply voltage.

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