Patents Assigned to Apogee Technology Inc.
  • Time division multiplexed PWM amplifier
    Patent number: 6552607
    Abstract: A bridged amplifier output stage capable of sharing a common conductor between independent loads. Multi-Channel pulse width modulated output signals are time division multiplexed to reduce the number of required conductors. The output stages are driven such that the non-common conductor time multiplexed off-channel(s) receives a copy of the shared common signal. The differential signal on the off-channel(s) is thereby cancelled even though the common conductor is carrying a signal for use by the on-channel.
    Type: Grant
    Filed: November 12, 2001
    Date of Patent: April 22, 2003
    Assignee: Apogee Technology Inc.
    Inventor: Michael Stephen Danielson
  • Distortion reduction method and apparatus for linearization of digital pulse width modulation by efficient calculation
    Patent number: 6430220
    Abstract: A system and method for reducing distortion in a pulse width modulated digital system by selectively implementing linearization. The linearization is implemented computationally efficient, using no division operations. A frequency detector is implemented which causes signals to bypass the linearization algorithm at frequencies where the new modes of distortion become significant as a result of the linearization when used in combination with an interpolation filter.
    Type: Grant
    Filed: September 19, 2000
    Date of Patent: August 6, 2002
    Assignee: Apogee Technology Inc.
    Inventor: Michael W. Determan