Patents by Inventor Darin Hunzeker

Darin Hunzeker 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).

  • Reducing LO leakage in a direct conversion receiver quadrature stage
    Patent number: 6766157
    Abstract: An LO leakage canceller for a direct conversion receiver is disclosed. The canceller includes an RF input stage operating to provide at least two input signals, a local oscillator, an in-phase processor, and a quadrature processor. The local oscillator is configured to produce at least two reference signals for modulating the two input signals. Each of the in-phase and quadrature processors includes two consecutive quadrature splitters operating to substantially reduce leakage of the reference signal from the local oscillator to the RF input stage.
    Type: Grant
    Filed: January 3, 2001
    Date of Patent: July 20, 2004
    Assignee: Kyocera Wireless Corp.
    Inventors: Darin Hunzeker, Ralph Kaufman
  • High efficiency switched gain power amplifier
    Patent number: 6208202
    Abstract: A power amplifier circuit arrangement including a driver amplifier, a switch, an amplifier path having a band pass filter and a power amplifier, and a bypass path which bypasses the power amplifier when excess gain and output power are not needed. When an RF-analog signal from the driver amplifier is switched to the amplifier path, the signal is band-pass filtered and amplified. Then the signal is split into an in-phase and a quadrature signal. Either the in-phase or the quadrature signal is inverted and summed with the other of the in-phase or quadrature signal, and the summed signal is transmitted to an output port. When the RF-signal from the driver amplified is switched to the bypass path, the power amplifier is turned off and the bypass path directs the signal to the output of the power amplifier, which appears as a high impedance to the signal. The signal reflects off the power amplifier to the output port.
    Type: Grant
    Filed: February 10, 1999
    Date of Patent: March 27, 2001
    Assignee: Qualcomm, Inc
    Inventors: Ralph E. Kaufman, Darin Hunzeker, Richard J. Camarillo
  • High efficiency switched gain power amplifier
    Patent number: 6060949
    Abstract: A power amplifier circuit arrangement including a power amplifier, and a bypass network for bypassing an RF-input signal around the power amplifier when excess gain and output power are not needed. When the bypass network is used, the power amplifier is turned off. A circulator connects the bypass network to the power amplifier output, thus removing the requirement of an output switch. The RF-input signal enters the circulator which routes the signal toward the output of the power amplifier. Because the amplifier is off, its output appears as a high impedance and reflects the signal back to the circulator. The circulator routes the reflected signal the signal output.
    Type: Grant
    Filed: September 22, 1998
    Date of Patent: May 9, 2000
    Assignee: Qualcomm Incorporated
    Inventors: Ralph Kaufman, Darin Hunzeker, Richard J. Camarillo