Patents by Inventor Brian Baxter

Brian Baxter 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).

  • Publication number: 20120299661
    Abstract: A charge pump of a power amplifier (PA) bias power supply and a process to prevent undershoot disruption of a bias power supply signal of the PA bias power supply are disclosed. The charge pump operates in one of multiple bias supply pump operating modes, which include at least a bias supply pump-up operating mode and a bias supply bypass operating mode. The process prevents selection of the bias supply pump-up operating mode from the bias supply bypass operating mode before charge pump circuitry in the charge pump is capable of providing adequate voltage to prevent undershoot disruption of the bias power supply signal.
    Type: Application
    Filed: November 29, 2011
    Publication date: November 29, 2012
    Applicant: RF MICRO DEVICES, INC.
    Inventors: Stuart Williams, Brian Baxter, Brad Hunkele, Hirofumi Honjo, Roman Zbigniew Arkiszewski, David E. Jones, Chris Levesque, William David Southcombe, Scott Yoder, Terry J. Stockert
  • Publication number: 20120299645
    Abstract: A direct current (DC)-DC converter and radio frequency (RF) power amplifier (PA) circuitry are disclosed. The DC-DC converter provides an envelope power supply signal to the RF PA circuitry based on a first power supply output control signal. As a temperature of the RF PA circuitry changes, the envelope power supply signal may need to be adjusted to meet temperature compensation requirements of the RF PA circuitry. With adequate thermal coupling between the DC-DC converter and the RF PA circuitry, adjustments to the envelope power supply signal may be based on temperature measurements of the DC-DC converter. A desired correction of the first power supply output control signal is determined based on a measured temperature of the DC-DC converter and the temperature compensation requirements of the RF PA circuitry. The first power supply output control signal is adjusted based on the desired correction.
    Type: Application
    Filed: November 28, 2011
    Publication date: November 29, 2012
    Applicant: RF MICRO DEVICES, INC.
    Inventors: William David Southcombe, Brian Baxter, David E. Jones, Chris Levesque, Scott Yoder, Terry J. Stockert
  • Publication number: 20120164505
    Abstract: A battery assembly for a mobile communication device includes a battery having a mounting surface, wherein a capacity of the battery increases with temperature. The battery assembly further includes a power amplifier assembly mounted to the mounting surface of the battery. The power amplifier assembly includes a power amplifier in thermal communication with the battery and a circuit board configured to receive the power amplifier, wherein the power amplifier is mounted to the circuit board. Generated heat from the power amplifier is transferred to the battery in order to increase the capacity of the battery in a given temperature environment.
    Type: Application
    Filed: December 22, 2010
    Publication date: June 28, 2012
    Applicant: RF MICRO DEVICES, INC.
    Inventors: Brian Baxter, Roman Zbigniew Arkiszewski
  • Publication number: 20120034893
    Abstract: The present disclosure relates to envelope power supply calibration of a multi-mode RF power amplifier (PA) to ensure adequate headroom when operating using one of multiple communications modes. The communications modes may include multiple modulation modes, a half-duplex mode, a full-duplex mode, or any combination thereof. As such, each communications mode may have specific peak-to-average power and linearity requirements for the multi-mode RF PA. As a result, each communications mode may have corresponding envelope power supply headroom requirements. The calibration may include determining a saturation operating constraint based on calibration data obtained during saturated operation of the multi-mode RF PA. During operation of the multi-mode RF PA, the envelope power supply may be restricted to provide a minimum allowable magnitude based on an RF signal level of the multi-mode RF PA, the communications mode, and the saturation operating constraint to provide adequate headroom.
    Type: Application
    Filed: February 1, 2011
    Publication date: February 9, 2012
    Applicant: RF MICRO DEVICES, INC.
    Inventors: Brian Baxter, Jason Millard, Roman Zbigniew Arkiszewski, Steven Selby
  • Patent number: 7877060
    Abstract: A system and method are provided for calibrating Amplitude Modulation to Phase Modulation (AM/PM) pre-distortion in a transmitter operating according to a polar modulation scheme. In general, phase modulation is disabled during transmission of an actual polar modulation signal. As a result, the transmitter provides a radio frequency (RF) output signal having an amplitude modulation component and ideally a constant phase. However, the AM/PM distortion of the transmitter creates a phase modulation component in the RF output signal. The phase component of the RF output signal, which is the AM/PM distortion of the transmitter, is measured by test equipment. The AM/PM pre-distortion applied by the transmitter is then calibrated based on the measured AM/PM distortion such that the AM/PM distortion of the transmitter is substantially reduced.
    Type: Grant
    Filed: February 6, 2006
    Date of Patent: January 25, 2011
    Assignee: RF Micro Devices, Inc.
    Inventors: Nadim Khlat, Wael A. Al-Qaq, Dennis Mahoney, Paul D. Brey, Brian Baxter
  • Patent number: 7551686
    Abstract: A system is provided for pre-distorting a transmit signal in a mobile terminal prior to amplification by a power amplifier to compensate for AM to AM and AM to PM distortion over an input value range. Pre-distortion circuitry includes both amplitude and phase pre-distortion circuitries. The amplitude pre-distortion circuitry distorts an amplitude component of a polar transmit signal using an amplitude compensation signal that essentially cancels the AM to AM distortion, and the phase pre-distortion circuitry distorts a phase component of the polar transmit signal using a phase compensation signal that essentially cancels the AM to PM distortion. The amplitude and phase compensation signals are generated based on corresponding sets of coefficients selected from a number of sets of coefficients defining polynomials describing compensation signals for each of at least two subsets of the input value range for each of two or more power levels of the power amplifier circuitry.
    Type: Grant
    Filed: June 23, 2004
    Date of Patent: June 23, 2009
    Assignee: RF Micro Devices, Inc.
    Inventors: David Coons, Brian Baxter
  • Patent number: 7545880
    Abstract: A system is provided for pre-distorting a transmit signal in a mobile terminal prior to amplification by a power amplifier to compensate for AM to AM and AM to PM distortion over an input value range. Pre-distortion circuitry includes both amplitude and phase pre-distortion circuitries. The amplitude pre-distortion circuitry distorts an amplitude component of a polar transmit signal using an amplitude compensation signal that essentially cancels the AM to AM distortion, and the phase pre-distortion circuitry distorts a phase component of the polar transmit signal using a phase compensation signal that essentially cancels the AM to PM distortion. The amplitude and phase compensation signals are generated based on corresponding sets of coefficients selected from a number of sets of coefficients defining polynomials describing compensation signals for each of at least two subsets of the input value range for each of two or more power levels of the power amplifier circuitry.
    Type: Grant
    Filed: August 29, 2007
    Date of Patent: June 9, 2009
    Assignee: RF Micro Devices, Inc.
    Inventors: David Coons, Brian Baxter
  • Publication number: 20080015210
    Abstract: A stabilized semi-solid delivery vehicle contains a polyorthoester and an excipient, and a pharmaceutical composition contains an active agent, optionally a stabilizing agent, and the delivery vehicle. The pharmaceutical composition may be a topical, syringable, or injectable formulation; and is suitable for local delivery of the active agent. Methods of treatment are also disclosed.
    Type: Application
    Filed: July 16, 2007
    Publication date: January 17, 2008
    Inventors: Devang Shah, John Barr, Brian Baxter, Jorge Heller
  • Publication number: 20070265329
    Abstract: A pharmaceutical composition for the sustained release of an effective amount of a selective 5-hydroxytryptamine 3 (5-HT3) receptor antagonist for the prevention, reduction or alleviation of acute and delayed chemotherapy-induced nausea and vomiting (CINV) following a course of emetogenic chemotherapy, wherein the composition is administered by subcutaneous injection, the composition comprising a 5-HT3 receptor antagonist, a semi-solid delivery vehicle and a pharmaceutically acceptable liquid excipient; wherein the composition, when administered in a single dosage, provides a controlled release of the 5-HT3 receptor antagonist and prolonging the release of the 5-HT3 receptor antagonist that tracks the profile of the incidence of vomiting.
    Type: Application
    Filed: May 12, 2006
    Publication date: November 15, 2007
    Inventors: Shah Devang, John Barr, Brian Baxter, Jorge Heller
  • Publication number: 20070264338
    Abstract: A stabilized semi-solid delivery vehicle contains a polyorthoester and an excipient, and a pharmaceutical composition contains an active agent, optionally a stabilizing agent, and the delivery vehicle. The pharmaceutical composition may be a topical, syringable, or injectable formulation; and is suitable for local delivery of the active agent. Methods of treatment are also disclosed.
    Type: Application
    Filed: May 12, 2006
    Publication date: November 15, 2007
    Inventors: Devang Shah, John Barr, Brian Baxter, Jorge Heller
  • Publication number: 20070264339
    Abstract: A stabilized semi-solid delivery vehicle contains a polyorthoester and an excipient, and a pharmaceutical composition contains an active agent, optionally a stabilizing agent, and the delivery vehicle. The pharmaceutical composition may be a topical, syringable, or injectable formulation; and is suitable for local delivery of the active agent. Methods of treatment are also disclosed.
    Type: Application
    Filed: December 1, 2006
    Publication date: November 15, 2007
    Inventors: Devang Shah, John Barr, Brian Baxter, Jorge Heller
  • Patent number: 7115353
    Abstract: A system and method for generating a master screen for a silk screen imaging process. Photo activated emulsion is applied to a printing screen and the emulsion is exposed according to a digitized pattern using a light emitting diode (LED) source. The LED source in one embodiment is an array of UV emitting devices which scans the printing screen in a line by line basis.
    Type: Grant
    Filed: July 9, 2002
    Date of Patent: October 3, 2006
    Inventors: Gary Baxter, Brian Baxter, David Kennedy, P. Gunnar Wareberg, Steve Wilson, David Rayner, Orson Bourne
  • Publication number: 20060098235
    Abstract: Methods of producing an image on a printing screen are described. The method uses inkjet printing technology to form an image on the screen using a computer to screen or computer to plate imaging technique. According to particular embodiments a specially formulated emulsion is used in which the emulsion is mixed with a cross-linking agent to create a self curing image.
    Type: Application
    Filed: October 29, 2003
    Publication date: May 11, 2006
    Applicant: National Research Council of Canada
    Inventors: Orson Bourne, Keith Ingold, David Kennedy, Gunnar Wareberg, David Girard, Gary Baxter, Brian Baxter
  • Publication number: 20050072325
    Abstract: A system and method for generating a master screen for a silk screen imaging process. Photo activated emulsion is applied to a printing screen and the emulsion is exposed according to a digitized pattern using a light emitting diode (LED) source. The LED source in one embodiment is an array of UV emitting devices which scans the printing screen in a line by line basis.
    Type: Application
    Filed: July 9, 2002
    Publication date: April 7, 2005
    Inventors: Gary Baxter, Brian Baxter, David Kennedy, P. Wareberg, Steve Wilson, David Rayner, Orson Bourne
  • Patent number: 6425707
    Abstract: An automatically self-erecting barrier which prevents ingress of flood water into a building. A float is provided which when inactive may serve as a doorstep, and which when active rises with the flood water to extend a barrier across a lower part of a doorway into the building. The barrier is guided at its lateral edge, and vertical channels may be fixed to the building on either side of the doorway. The barrier may be sealed to the channels by inflatable sealing elements.
    Type: Grant
    Filed: April 10, 2000
    Date of Patent: July 30, 2002
    Inventor: Malcolm Brian Baxter