Patents by Inventor Tony Doy

Tony Doy has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Single supply direct drive amplifier
    Publication number: 20050184807
    Abstract: A driver amplifier operative from a single DC voltage supply, coupled directly to the output load without the need for DC coupling capacitors used for preventing DC reaching the output load. An onboard power supply generates a negative voltage rail that powers the output amplifiers, allowing driver amplifier operation from both positive and negative rails. Since the amplifiers can be biased at ground potential (0 volts), no significant DC voltage exists across the load and the need for DC coupling capacitors is eliminated.
    Type: Application
    Filed: January 18, 2005
    Publication date: August 25, 2005
    Inventors: Tony Doy, Ronald Koo
  • Single supply headphone driver/charge pump combination
    Publication number: 20030138112
    Abstract: A headphone driver amplifier operative from a single DC voltage supply, coupled directly to the headphone speakers without the need for DC coupling capacitors used for preventing DC reaching the headphones. An onboard power supply generates a negative voltage rail which powers the output amplifiers, allowing driver amplifier operation from both positive and negative rails. Since the amplifiers can be biased at ground potential (O volts), no significant DC voltage exists across the speaker load and the need for DC coupling capacitors is eliminated.
    Type: Application
    Filed: January 24, 2002
    Publication date: July 24, 2003
    Inventor: Tony Doy