Patents by Inventor Bert K. Oyama
Bert K. Oyama 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: 6813320Abstract: A receiver (10) for a wireless telecommunications system that provides relatively wideband signal processing of received signals without increased signal distortion so that multiple received signals can be simultaneously processed. The receiver (10) includes a specialized LNA (16), frequency down-converter (18) and ADC (20) to perform the wideband signal processing while maintaining receiver performance. The frequency down-converter (18) employs a suitable mixer (28), BPA (32), attenuator (34), and transformer (36) that are tuned to provide the desired frequency down-conversion and amplitude control over the desired wideband. The down-converter devices are selected depending on the particular performance criteria of the ADC (20). A specialized digital channelizer (22) is included in the receiver (10) that receives the digital signal from the ADC (20), and separates the signals into the multiple channels.Type: GrantFiled: June 28, 2000Date of Patent: November 2, 2004Assignee: Northrop Grumman CorporationInventors: Shimen K. Claxton, Bert K. Oyama, Eric L. Upton, Barry R. Allen, Mark Kintis, Andrew D. Smith, Craig R. Talbott, David J. Brunone, Donald R. Martin, William M. Skones, Ronald P. Smith, Vincent C. Moretti
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Patent number: 6804308Abstract: A receiver (10) for a wireless telecommunications system that provides relatively wideband signal processing of received signals without increased signal distortion so that multiple received signals can be simultaneously processed. The receiver (10) includes a specialized LNA (16), frequency down-converter (18) and ADC (20) to perform the wideband signal processing while maintaining receiver performance. The frequency down-converter (18) employs a suitable mixer (28), BPA (32), attenuator (34), and transformer (36) that are tuned to provide the desired frequency down-conversion and amplitude control over the desired wideband. The down-converter devices are selected depending on the particular performance criteria of the ADC (20). A specialized digital channelizer (22) is included in the receiver (10) that receives the digital signal from the ADC (20), and separates the signals into the multiple channels.Type: GrantFiled: June 28, 2000Date of Patent: October 12, 2004Assignee: Northrop Grumman CorporationInventors: Shimen K. Claxton, Bert K. Oyama, Mark Kintis, Andrew D. Smith, Craig R. Talbott, Donald R. Martin, William M. Skones, Vincent C. Moretti
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Patent number: 6801583Abstract: A receiver (10) for a wireless telecommunications system that provides relatively wideband signal processing of received signals without increased signal distortion so that multiple received signals can be simultaneously processed. The receiver (10) includes a specialized LNA (16), frequency down-converter (18) and ADC (20) to perform the wideband signal processing while maintaining receiver performance. A specialized digital channelizer (22) is included in the receiver (10) that receives the digital signal from the ADC (20), and separates the signals into the multiple channels. In one embodiment, the frequency down-conversion is performed in a single down-conversion process, and the ADC (20) employs delta-sigma processing to provide digital conversion over the complete frequency band.Type: GrantFiled: June 28, 2000Date of Patent: October 5, 2004Assignee: Northrop Grumman CorporationInventors: Shimen K. Claxton, Bert K. Oyama, Mark Kintis, Andrew D. Smith, Craig R. Talbott, Donald R. Martin, William M. Skones, Ronald P. Smith, Vincent C. Moretti
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Patent number: 6798848Abstract: A receiver (10) for a wireless telecommunications system that provides relatively wideband signal processing of received signals without increased signal distortion so that multiple received signals can be simultaneously processed. The receiver (10) includes a specialized LNA (16), frequency down-converter (18) and ADC (20) to perform the wideband signal processing while maintaining receiver performance. The frequency down-converter (18) employs a suitable mixer (28), BPA (32), attenuator (34), and transformer (36) that are tuned to provide the desired frequency down-conversion and amplitude control over the desired wideband. The down-converter devices are selected depending on the particular performance criteria of the ADC (20). A specialized digital channelizer (22) is included in the receiver (10) that receives the digital signal from the ADC (20), and separates the signals into the multiple channels.Type: GrantFiled: June 28, 2000Date of Patent: September 28, 2004Assignee: Northrop Grumman CorporationInventors: Shimen K. Claxton, Bert K. Oyama, Mark Kintis, Andrew D. Smith, Craig R. Talbott, Donald R. Martin, William M. Skones, Ronald P. Smith, Vincent C. Moretti
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Patent number: 6631255Abstract: A receiver (10) for a wireless telecommunications system that provides relatively wideband signal processing of received signals without increased signal distortion so that multiple received signals can be simultaneously processed. The receiver (10) includes a specialized LNA (16), frequency down-converter (18) and ADC (20) to perform the wideband signal processing while maintaining receiver performance. The frequency down-converter (18) employs a suitable mixer (28), BPA (32), attenuator (34), and transformer (36) that are tuned to provide the desired frequency down-conversion and amplitude control over the desired wideband. The down-converter devices are selected depending on the particular performance criteria of the ADC (20). A specialized digital channelizer (22) is included in the receiver (10) that receives the digital signal from the ADC (20), and separates the signals into the multiple channels.Type: GrantFiled: June 28, 2000Date of Patent: October 7, 2003Assignee: Northrop Grumman CorporationInventors: Shimen K. Claxton, Bert K. Oyama, Barry R. Allen, Mark Kintis, Andrew D. Smith, Craig R. Talbott, David J. Brunone, Donald R. Martin, William M. Skones, Vincent C. Moretti
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Patent number: 6437718Abstract: An analog-to-digital converter (170) that employs delta-sigma technology, and has particular use in a receiver for a wireless telecommunications system. The converter (170) includes a delta-sigma modulator (172), having a summing junction (180) that receives the analog input signal to be converted. A feedback from the output of a comparator (186) is subtracted from the analog input signal to generate a difference signal that is then filtered, amplified and applied to the comparator (186) for digital conversion. A sample and hold circuit (184) receives the difference signal and holds the signal for a predetermined period of time so that the input to the comparator (186) is stable. A differential limiting amplifier (188) is employed to make the high data rate output of the comparator (186) stable. The differential limiting amplifier (188) can be within the comparator (186) itself, or in the feedback path. In one embodiment, the differential amplifier (188) employs a Schottky diode clamp (226).Type: GrantFiled: June 28, 2000Date of Patent: August 20, 2002Assignee: TRW Inc.Inventors: Bert K. Oyama, William M. Skones
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Patent number: 5614903Abstract: A circuit arrangement for suppressing spurious frequency components of an analog output of a digital-to-analog converter (DAC) features a track-and-reset sampling circuit coupled between the output of the DAC and a linearized differential buffer amplifier circuit including a filter circuit for minimizing high frequency distortion normally accompanying the output of a DAC operating at high frequencies, such as on the order of 500 MHz.Type: GrantFiled: August 29, 1995Date of Patent: March 25, 1997Assignee: TRW Inc.Inventor: Bert K. Oyama