Patents by Inventor Lawrence R. Schumacher
Lawrence R. Schumacher 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).
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Patent number: 8995939Abstract: A method and apparatus can cut back power in a simultaneous dual frequency band call. The method may operate a dual frequency band transmit device. The method may include determining if a transmit frequency in a first frequency band from the device combined with a transmit frequency in a second frequency band from the device causes receiver desensitization at the device. The method may include determining if the transmit power in the first frequency band is above a threshold power. The method may include reducing maximum transmit power in the second frequency band by an amount proportional to transmit power in the first frequency band and transmit signal bandwidth in the second frequency band in only the portion of the second frequency band where a resultant frequency component can cause desensitization.Type: GrantFiled: December 6, 2013Date of Patent: March 31, 2015Assignee: Google Technology Holdings LLCInventors: Dean E Thorson, Thomas D Nagode, Lawrence R Schumacher
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Patent number: 8923167Abstract: A communication device reduces intermodulation interference in a simultaneous transmitter using a notch diplexing arrangement. The communication device has a radio front-end module with more than one transceiver for simultaneous transmission with opposing transmit (Tx) band notch filters in series with each duplexer output, and phase rotations into and out of the notch filters suitable for diplexing at the notch filter outputs.Type: GrantFiled: September 27, 2011Date of Patent: December 30, 2014Assignee: Google Technology Holdings LLCInventors: Gregory R. Black, Ryan J. Goedken, Thomas D. Nagode, Ernie Schirmann, Lawrence R. Schumacher
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Publication number: 20140094215Abstract: A method and apparatus can cut back power in a simultaneous dual frequency band call. The method may operate a dual frequency band transmit device. The method may include determining if a transmit frequency in a first frequency band from the device combined with a transmit frequency in a second frequency band from the device causes receiver desensitization at the device. The method may include determining if the transmit power in the first frequency band is above a threshold power. The method may include reducing maximum transmit power in the second frequency band by an amount proportional to transmit power in the first frequency band and transmit signal bandwidth in the second frequency band in only the portion of the second frequency band where a resultant frequency component can cause desensitization.Type: ApplicationFiled: December 6, 2013Publication date: April 3, 2014Applicant: Motorola Mobility LLCInventors: Dean E Thorson, Thomas D. Nagode, Lawrence R. Schumacher
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Patent number: 8611837Abstract: A method and apparatus can cut back power in a simultaneous dual frequency band call. The method may operate a dual frequency band transmit device. The method may include determining if a transmit frequency in a first frequency band from the device combined with a transmit frequency in a second frequency band from the device causes receiver desensitization at the device. The method may include determining if the transmit power in the first frequency band is above a threshold power. The method may include reducing maximum transmit power in the second frequency band by an amount proportional to transmit power in the first frequency band and transmit signal bandwidth in the second frequency band in only the portion of the second frequency band where a resultant frequency component can cause desensitization.Type: GrantFiled: August 30, 2011Date of Patent: December 17, 2013Assignee: Motorola Mobility LLCInventors: Dean E. Thorson, Thomas D. Nagode, Lawrence R. Schumacher
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Publication number: 20130077540Abstract: A communication device reduces intermodulation interference in a simultaneous transmitter using a notch diplexing arrangement. The communication device has a radio front-end module with more than one transceiver for simultaneous transmission with opposing transmit (Tx) band notch filters in series with each duplexer output, and phase rotations into and out of the notch filters suitable for diplexing at the notch filter outputs.Type: ApplicationFiled: September 27, 2011Publication date: March 28, 2013Applicant: MOTOROLA MOBILITY, INC.Inventors: Gregory R. Black, Ryan J. Goedken, Thomas D. Nagode, Ernie Schirmann, Lawrence R. Schumacher
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Publication number: 20130053088Abstract: A method and apparatus can cut back power in a simultaneous dual frequency band call. The method may operate a dual frequency band transmit device. The method may include determining if a transmit frequency in a first frequency band from the device combined with a transmit frequency in a second frequency band from the device causes receiver desensitization at the device. The method may include determining if the transmit power in the first frequency band is above a threshold power. The method may include reducing maximum transmit power in the second frequency band by an amount proportional to transmit power in the first frequency band and transmit signal bandwidth in the second frequency band in only the portion of the second frequency band where a resultant frequency component can cause desensitization.Type: ApplicationFiled: August 30, 2011Publication date: February 28, 2013Applicant: MOTOROLA MOBILITY, INC.Inventors: Dean E. Thorson, Thomas D. Nagode, Lawrence R. Schumacher
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Publication number: 20120088455Abstract: A method in a multimode wireless communication device that communicates using a first radio access technology in a first mode and using a second radio access technology in a second mode is disclosed. The device determines a state of the first radio access technology, indicates to the second radio access technology a state of the first radio access technology, and adjusts a maximum transmit power limit associated with either the first radio access technology or the second radio access technology based on the state of the first radio access technology.Type: ApplicationFiled: October 3, 2011Publication date: April 12, 2012Applicant: Motorola Mobility, Inc.Inventors: Robert T. Love, Ravi Kuchibhotla, Lawrence R. Schumacher, Kenneth A. Stewart
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Patent number: 6927627Abstract: A method in an amplifier, for example, a power amplifier in a wireless transmitter, including monitoring (310) a characteristic of the amplifier during a first active interval of the first set of active intervals, storing (320) the amplifier characteristic monitored during the first active interval of the first set of active intervals, correcting (340) an open-loop control signal to the amplifier based on the stored amplifier characteristic monitored during the first active interval of the first set of active intervals, and providing (350) the corrected control signal during a second active interval of the set of first active intervals subsequent to the first active interval of the set of first active intervals.Type: GrantFiled: September 22, 2003Date of Patent: August 9, 2005Assignee: Motorola, Inc.Inventors: Lawrence R. Schumacher, Vimalkaushik Natarajan
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Patent number: 6876635Abstract: A method for reducing current drain in a communication device includes a step of determining when the communication device is transmitting. A next step includes lowering the current level to the receiver when communication device is not transmitting. A next step includes raising the current level to the receiver when communication device is transmitting. Changing the current level alters the linearity of the receiver. As a result, the communication device reduces power consumption while operating in a traffic channel. The system is applicable to full duplex systems such as code division multiple access (CDMA) systems.Type: GrantFiled: November 5, 2001Date of Patent: April 5, 2005Assignee: Motorola, Inc.Inventors: Brian H. Bremer, Jeremy A. Jacobson, Lawrence R. Schumacher
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Publication number: 20030086383Abstract: A method for reducing current drain in a communication device includes a step of determining when the communication device is transmitting. A next step includes lowering the current level to the receiver when communication device is not transmitting. A next step includes raising the current level to the receiver when communication device is transmitting. Changing the current level alters the linearity of the receiver. As a result, the communication device reduces power consumption while operating in a traffic channel. The system is applicable to full duplex systems such as code division multiple access (CDMA) systems.Type: ApplicationFiled: November 5, 2001Publication date: May 8, 2003Inventors: Brian H. Bremer, Jeremy A. Jacobson, Lawrence R. Schumacher
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Patent number: 5212815Abstract: A directional coupler (103) for radio equipment couples a radio frequency signal from an input of a microstrip transmission line (309) to an output and provides a directionally coupled output via a stripline microstrip (311). Open circuit microstrip transmission line stubs (313 and 315) are tuned to a quarter wavelength of the third harmonic of the radio frequency to provide third harmonic rejection within the directional coupler.Type: GrantFiled: September 3, 1991Date of Patent: May 18, 1993Assignee: Motorola, Inc.Inventor: Lawrence R. Schumacher
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Patent number: 4998217Abstract: Microprocessor (MPU) controlled voltage controlled oscillator (VCO) linearization circuitry locks the VCO at desired low, center and high frequencies (F.sub.1, F.sub.c and F.sub.h) and measures the magnitudes of the corresponding control voltages (V.sub.1, V.sub.c and V.sub.h). Next, the VCO is swept at a nominal clock frequency to determine the times (T.sub.1, T.sub.2 and T.sub.h) that the control voltages (V.sub.1, V.sub.c and V.sub.h) occur during the sweep cycle. The control voltage of the VCO is then swept at a first and then a second rate during a sweep cycle to assure that the center frequency (F.sub.c) of the VCO occurs at the time (T.sub.c) midpoint of the sweep cycle. As a result, each VCO frequency can be determined by MPU monitoring according to the time that the VCO frequency occurs during the sweep cycle. This circuitry is useful in spectrum analyzers for indirectly determining the otherwise unknown frequency of a received signal.Type: GrantFiled: May 1, 1989Date of Patent: March 5, 1991Assignee: Motorola, Inc.Inventors: Don R. Holcomb, Thomas J. Hoppal, Mark J. Brown, Lawrence R. Schumacher
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Patent number: 4977613Abstract: An additional mixer is included in the feedback loop of a PLL which can be one of the local oscillators of a dual conversion system. A fine tuning frequency synthesizer is coupled to an input of the additional mixer for providing fine frequency control of the PLL. The fine tuning frequency synthesizer can include an additional phase locked loop. Also, a feedback signal for suppressing noise created by another local oscillator can also be applied to the additional mixer.Type: GrantFiled: October 17, 1988Date of Patent: December 11, 1990Assignee: Motorola, Inc.Inventors: Don R. Holcomb, Sr., Mark J. Brown, Lawrence R. Schumacher