Patents by Inventor Bengt-Olov Andersson

Bengt-Olov Andersson 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).

  • Patent number: 6621335
    Abstract: A Class D amplifier device with reduced power consumption uses a passive RC network. The output of the RC network directly feeds a comparator resulting in increased efficiency. The RC network is configured to perform several functions, including the low pass filtering of the feedback signal to remove high frequency/high amplitude clock components and provides a DC path from its output to reduce duty cycle errors. Additionally, the input signal receives low pass filtering, creating a generally flat frequency response. Finally, the clock signal is filtered to generate a triangle wave of good linearity and appropriate amplitude.
    Type: Grant
    Filed: February 22, 2002
    Date of Patent: September 16, 2003
    Assignee: Microsemi Corporation
    Inventor: Bengt-Olov Andersson
  • Publication number: 20020153947
    Abstract: A Class D amplifier device with reduced power consumption uses a passive RC network. The output of the RC network directly feeds a comparator resulting in increased efficiency. The RC network is configured to perform several functions, including the low pass filtering of the feedback signal to remove high frequency/high amplitude clock components and provides a DC path from its output to reduce duty cycle errors. Additionally, the input signal receives low pass filtering, creating a generally flat frequency response. Finally,the clock signal is filtered to generate a triangle wave of good linearity and appropriate amplitude.
    Type: Application
    Filed: February 22, 2002
    Publication date: October 24, 2002
    Inventor: Bengt-Olov Andersson
  • Patent number: 6208199
    Abstract: A low power pulse amplifier with low duty cycle errors. The amplifier provides several differential amplifier stages with a biasing and canceling network. To minimize duty cycle errors for large input signals, cascode transistors are added between the drains of the differential amplifiers and the outputs. The result is an amplifier having a duty cycle error of less than 5% at amplitude input ranges from 5 millivolts to the supply voltage.
    Type: Grant
    Filed: March 17, 1999
    Date of Patent: March 27, 2001
    Assignee: Mitel Semiconductor AB
    Inventor: Bengt-Olov Andersson