Patents by Inventor Tony Ohlsson

Tony Ohlsson 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).

  • MOS circuit for lowering forward voltage of diodes
    Patent number: 6717830
    Abstract: A circuit for lowering the effective voltage drop of a semi-conductor diode. The circuit includes a first Metal Oxide Semi-conductor (MOS) device connected in parallel with the diode. A bias voltage which is close to but lower than the threshold voltage is applied to the MOS device. When a forward voltage is applied to the diode, this voltage is added to the source to drain voltage of the MOS device which turns it on. The MOS device then bypasses the diode to effectively overcome the inherent forward voltage drop of the diode. The circuit is advantageously applied to a rectifier circuit to reduce input voltage requirements and improve the efficiency of the rectifier.
    Type: Grant
    Filed: January 30, 2002
    Date of Patent: April 6, 2004
    Assignee: Zarlink Semiconductor AB
    Inventor: Tony Ohlsson
  • CMOS low battery voltage detector
    Patent number: 6445305
    Abstract: A system and method for detecting a low battery voltage supplied to a battery operated integrated circuit. A stable reference voltage provided by a bangap reference is compared with the battery voltage. A switched capacitor circuit is used instead of the more conventional resistor combination to supply a scaled representation of the battery voltage. Power requirements are reduced by combining the bandgap reference and the comparator into a single component.
    Type: Grant
    Filed: February 1, 2001
    Date of Patent: September 3, 2002
    Assignee: Mitel Semiconductor AB
    Inventors: Olle Andersson, Tony Ohlsson
  • MOS circuit for lowering forward voltage of diodes
    Publication number: 20020118557
    Abstract: A circuit for lowering the effective voltage drop of a semi-conductor diode. The circuit includes a first Metal Oxide Semi-conductor (MOS) device connected in parallel with the diode. A bias voltage which is close to but lower than the threshold voltage is applied to the MOS device. When a forward voltage is applied to the diode, this voltage is added to the source to drain voltage of the MOS device which turns it on. The MOS device then bypasses the diode to effectively overcome the inherent forward voltage drop of the diode. The circuit is advantageously applied to a rectifier circuit to reduce input voltage requirements and improve the efficiency of the rectifier.
    Type: Application
    Filed: January 30, 2002
    Publication date: August 29, 2002
    Applicant: Zarlink Semiconductor AB
    Inventor: Tony Ohlsson
  • CMOS low battery voltage detector
    Publication number: 20010026226
    Abstract: A system and method for detecting a low battery voltage supplied to a battery operated integrated circuit. A stable reference voltage provided by a bangap reference is compared with the battery voltage. A switched capacitor circuit is used instead of the more conventional resistor combination to supply a scaled representation of the battery voltage. Power requirements are reduced by combining the bandgap reference and the comparator into a single component.
    Type: Application
    Filed: February 1, 2001
    Publication date: October 4, 2001
    Inventors: Olle Andersson, Tony Ohlsson