Darin S Hunzeker

6766157, Jul 20, 2004

Jan 3, 2001

09/754104

Darin Hunzeker - San Diego CA
Ralph Kaufman - La Mesa CA

Kyocera Wireless Corp. - San Diego CA

H04B 110

455317, 455316, 455318, 455325

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.

54324572, Jul 11, 1995

Jan 28, 1994

8/188283

Kenneth M. Mitzner - Torrance CA
Darin S. Hunzeker - Mission Viejo CA
William Hant - Los Angeles CA
Silvan S. Locus - Van Nuys CA
John C. Bryant - Los Alamitos CA

Northrop Grumman Corporation - Los Angeles CA

G01R 2726
G01R 3108

324690

A probe for measurement of an electrically conductive surface covered by an insulating cover layer has a pair of electrically conductive pads for capacitive coupling to the conductive surface. The pads may be formed by photolithography as part of a disk of a metallic layer disposed on a substrate of low dielectric material such as fibrous glass in an epoxy binder, the pads being separated by a relatively narrow gap. Included within the probe is an electrically insulating holder for supporting the substrate and the pads, the holder being configured to facilitate manual manipulation of the probe. The probe connects with a signal analyzer which provides a test signal coupled to the pads via a coaxial transmission line. During a sliding of the pads along the cover layer, electrical characteristics of a signal coupled capacitively via the pads to the conductive surface are analyzed by the analyzer to provide information on electrical continuity and resistivity of the surface.

60609494, May 9, 2000

Sep 22, 1998

9/158456

Ralph Kaufman - La Mesa CA
Darin Hunzeker - San Diego CA
Richard J. Camarillo - San Diego CA

Qualcomm Incorporated - San Diego CA

H03F 368

330 51

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.

62082027, Mar 27, 2001

Feb 10, 1999

9/248048

Ralph E. Kaufman - La Mesa CA
Darin Hunzeker - San Diego CA
Richard J. Camarillo - San Diego CA

Qualcomm, Inc - San Diego CA

H03F1/14

330 51

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. This design preserves the benefits of bypassing the power amplifier by reducing the amount of switching loss introduced into the circuit.