Patents by Inventor David J. McLaurin
David J. McLaurin 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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Publication number: 20230353160Abstract: Systems, devices, and methods related to frequency converter arrangements are provided. For example, a frequency converter arrangement converts a first signal centered at a first frequency to a second signal centered at a second frequency different from the first frequency. The frequency converter arrangement includes local oscillator (LO) circuitry and in-phase, quadrature-phase (IQ) mixer circuitry coupled to the LO circuitry. The LO circuitry includes duty cycle correction circuitry to adjust a duty cycle of a pair of input clock signals. The duty cycle correction circuitry includes coarse tuning circuitry responsive to a digital calibration code, and analog tuning loop circuitry. The LO circuitry further includes quadrature divider circuitry coupled to an output of the duty cycle correction circuitry, where the quadrature divider circuitry generates an in-phase LO signal and a quadrature-phase LO signal from a pair of output clock signals at outputs of the duty cycle correction circuitry.Type: ApplicationFiled: April 28, 2022Publication date: November 2, 2023Applicant: Analog Devices International Unlimited CompanyInventors: Justin L. FORTIER, Christopher W. ANGELL, David J. MCLAURIN, Oscar S. BURBANO, Ionel GHEORGHE, Mostafa HAROUN, Xing ZHOU
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Patent number: 11444669Abstract: Embodiments of the present disclosure relate to cellular technology applications of beamforming performed in the digital domain. In one aspect, an RF system for performing digital beamforming on a per-carrier basis is disclosed, where different phase and/or amplitude adjustments are applied to signals of different frequency ranges (i.e., to different carrier signals). In another aspect, an RF system for performing digital beamforming on a per-antenna basis is disclosed, where different phase and/or amplitude adjustments are applied to signals transmitted from or received by different antennas. In some embodiments, an RF system may be configured to implement both digital beamforming on a per-carrier basis and digital beamforming on a per-antenna basis. The RF systems disclosed herein allow implementing programmable beamforming in the digital domain in a manner that is significantly less complex than conventional implementations.Type: GrantFiled: July 9, 2021Date of Patent: September 13, 2022Assignee: ANALOG DEVICES, INC.Inventors: Antonio Montalvo, David J. McLaurin
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Publication number: 20210391905Abstract: Embodiments of the present disclosure relate to cellular technology applications of beamforming performed in the digital domain. In one aspect, an RF system for performing digital beamforming on a per-carrier basis is disclosed, where different phase and/or amplitude adjustments are applied to signals of different frequency ranges (i.e., to different carrier signals). In another aspect, an RF system for performing digital beamforming on a per-antenna basis is disclosed, where different phase and/or amplitude adjustments are applied to signals transmitted from or received by different antennas. In some embodiments, an RF system may be configured to implement both digital beamforming on a per-carrier basis and digital beamforming on a per-antenna basis. The RF systems disclosed herein allow implementing programmable beamforming in the digital domain in a manner that is significantly less complex than conventional implementations.Type: ApplicationFiled: July 9, 2021Publication date: December 16, 2021Applicant: Analog Devices, Inc.Inventors: Antonio MONTALVO, David J. MCLAURIN
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Patent number: 11095350Abstract: Embodiments of the present disclosure relate to cellular technology applications of beamforming performed in the digital domain. In one aspect, an RF system for performing digital beamforming on a per-carrier basis is disclosed, where different phase and/or amplitude adjustments are applied to signals of different frequency ranges (i.e., to different carrier signals). In another aspect, an RF system for performing digital beamforming on a per-antenna basis is disclosed, where different phase and/or amplitude adjustments are applied to signals transmitted from or received by different antennas. In some embodiments, an RF system may be configured to implement both digital beamforming on a per-carrier basis and digital beamforming on a per-antenna basis. The RF systems disclosed herein allow implementing programmable beamforming in the digital domain in a manner that is significantly less complex than conventional implementations.Type: GrantFiled: June 16, 2020Date of Patent: August 17, 2021Assignee: ANALOG DEVICES, INC.Inventors: Antonio Montalvo, David J. Mclaurin
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Patent number: 11012104Abstract: Apparatus and methods for calibrating radio frequency transmitters to compensate for common mode local oscillator leakage are provided herein. In certain configurations herein, a transmitter generates a radio frequency transmit signal based on mixing a baseband input signal with a local oscillator signal. The transmitter is calibrated to compensate for common mode local oscillator leakage. Thus, a common mode component of the local oscillator signal is reduced or eliminated from the radio frequency transmit signal, which provides a number of benefits, including lower levels of undesired emissions from the transmitter.Type: GrantFiled: April 4, 2017Date of Patent: May 18, 2021Assignee: Analog Devices, Inc.Inventors: David J. McLaurin, Christopher Mayer, Hatice Dicle Ozis Unsal, Zheng Gao
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Patent number: 11012201Abstract: A transmission module is provided that includes a transmitter, a loopback receiver, and a QEC controller. The QEC controller identifies quadrature imbalance in the transmitter based at least one a comparison of the data signals at the output of the loopback receiver with data signals at the input of the transmitter. Based on the comparison, the QEC controller can adjust one or more characteristics of the transmitter to correct quadrature errors in the transmitter.Type: GrantFiled: July 24, 2014Date of Patent: May 18, 2021Assignee: Analog Devices, Inc.Inventors: Raju Hormis, Steven R. Bal, Antonio Montalvo, David J. McLaurin, Martin McCormick
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Patent number: 10659065Abstract: Apparatus and methods for phase synchronization of phase-locked loops (PLLs) are provided. In certain configurations, an RF communication system includes a PLL that generates one or more output clock signals and a phase synchronization circuit that synchronizes a phase of the PLL. The phase synchronization circuit includes a sampling circuit that generates samples by sampling the one or more output clock signals based on timing of a reference clock signal. Additionally, the phase synchronization circuit includes a phase difference calculation circuit that generates a phase difference signal based on the samples and a tracking digital phase signal representing the phase of the PLL. The phase synchronization circuit further includes a phase adjustment control circuit that provides a phase adjustment to the PLL based on the phase difference signal so as to synchronize the PLL.Type: GrantFiled: April 19, 2018Date of Patent: May 19, 2020Assignee: ANALOG DEVICES, INC.Inventors: Christopher Mayer, David J. McLaurin, Christopher W. Angell, Sudhir Desai, Steven R. Bal
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Patent number: 10644731Abstract: Transmitter noise cancellation may be applied on a channel by channel basis to active channels of an incoming radio frequency signal received at a receiver. A noise cancellation filter may be provided for each active channel in a predetermined signal band. Applying noise cancellation on a per active channel basis instead of to the entire receive band may substantially reduce the filtering requirement and number of filter coefficients or taps to save power and reduce manufacturing costs. Channelized transmitter noise cancellers, multi transmitter-receiver cross coupling cancellers, and hybrid full signal band and channelized transmitter noise cancellers are also provided.Type: GrantFiled: November 2, 2017Date of Patent: May 5, 2020Assignee: Analog Devices International Unlimited CompanyInventors: Patrick Pratt, Peadar Antony Forbes, David J. McLaurin, Martin McCormick
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Publication number: 20180294817Abstract: Apparatus and methods for phase synchronization of phase-locked loops (PLLs) are provided. In certain configurations, an RF communication system includes a PLL that generates one or more output clock signals and a phase synchronization circuit that synchronizes a phase of the PLL. The phase synchronization circuit includes a sampling circuit that generates samples by sampling the one or more output clock signals based on timing of a reference clock signal. Additionally, the phase synchronization circuit includes a phase difference calculation circuit that generates a phase difference signal based on the samples and a tracking digital phase signal representing the phase of the PLL. The phase synchronization circuit further includes a phase adjustment control circuit that provides a phase adjustment to the PLL based on the phase difference signal so as to synchronize the PLL.Type: ApplicationFiled: April 19, 2018Publication date: October 11, 2018Inventors: Christopher Mayer, David J. McLaurin, Christopher W. Angell, Sudhir Desai, Steven R. Bal
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Publication number: 20180254786Abstract: Apparatus and methods for calibrating radio frequency transmitters to compensate for common mode local oscillator leakage are provided herein. In certain configurations herein, a transmitter generates a radio frequency transmit signal based on mixing a baseband input signal with a local oscillator signal. The transmitter is calibrated to compensate for common mode local oscillator leakage. Thus, a common mode component of the local oscillator signal is reduced or eliminated from the radio frequency transmit signal, which provides a number of benefits, including lower levels of undesired emissions from the transmitter.Type: ApplicationFiled: April 4, 2017Publication date: September 6, 2018Inventors: David J. McLaurin, Christopher Mayer, Hatice Dicle Ozis Unsal, Zheng Gao
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Patent number: 9979408Abstract: Apparatus and methods for phase synchronization of phase-locked loops (PLLs) are provided. In certain configurations, an RF communication system includes a PLL that generates one or more output clock signals and a phase synchronization circuit that synchronizes a phase of the PLL. The phase synchronization circuit includes a sampling circuit that generates samples by sampling the one or more output clock signals based on timing of a reference clock signal. Additionally, the phase synchronization circuit includes a phase difference calculation circuit that generates a phase difference signal based on the samples and a tracking digital phase signal representing the phase of the PLL. The phase synchronization circuit further includes a phase adjustment control circuit that provides a phase adjustment to the PLL based on the phase difference signal so as to synchronize the PLL.Type: GrantFiled: May 5, 2016Date of Patent: May 22, 2018Assignee: Analog Devices, Inc.Inventors: Christopher Mayer, David J. McLaurin, Christopher W. Angell, Sudhir Desai, Steven R. Bal
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Publication number: 20180062675Abstract: Transmitter noise cancellation may be applied on a channel by channel basis to active channels of an incoming radio frequency signal received at a receiver. A noise cancellation filter may be provided for each active channel in a predetermined signal band. Applying noise cancellation on a per active channel basis instead of to the entire receive band may substantially reduce the filtering requirement and number of filter coefficients or taps to save power and reduce manufacturing costs. Channelized transmitter noise cancellers, multi transmitter-receiver cross coupling cancellers, and hybrid full signal band and channelized transmitter noise cancellers are also provided.Type: ApplicationFiled: November 2, 2017Publication date: March 1, 2018Inventors: Patrick Pratt, Peadar Antony Forbes, David J. McLaurin, Martin McCormick
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Patent number: 9831898Abstract: Transmitter noise cancellation may be applied on a channel by channel basis to active channels of an incoming radio frequency signal received at a receiver. A noise cancellation filter may be provided for each active channel in a predetermined signal band. Applying noise cancellation on a per active channel basis instead of to the entire receive band may substantially reduce the filtering requirement and number of filter coefficients or taps to save power and reduce manufacturing costs. Channelized transmitter noise cancellers, multi transmitter-receiver cross coupling cancellers, and hybrid full signal band and channelized transmitter noise cancellers are also provided.Type: GrantFiled: March 13, 2013Date of Patent: November 28, 2017Assignee: Analog Devices GlobalInventors: Patrick Pratt, Peadar Antony Forbes, David J. McLaurin, Martin McCormick
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Publication number: 20170324419Abstract: Apparatus and methods for phase synchronization of phase-locked loops (PLLs) are provided. In certain configurations, an RF communication system includes a PLL that generates one or more output clock signals and a phase synchronization circuit that synchronizes a phase of the PLL. The phase synchronization circuit includes a sampling circuit that generates samples by sampling the one or more output clock signals based on timing of a reference clock signal. Additionally, the phase synchronization circuit includes a phase difference calculation circuit that generates a phase difference signal based on the samples and a tracking digital phase signal representing the phase of the PLL. The phase synchronization circuit further includes a phase adjustment control circuit that provides a phase adjustment to the PLL based on the phase difference signal so as to synchronize the PLL.Type: ApplicationFiled: May 5, 2016Publication date: November 9, 2017Inventors: Christopher Mayer, David J. McLaurin, Christopher W. Angell, Sudhir Desai, Steven R. Bal
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Patent number: 9787415Abstract: A method and apparatus for estimating and compensating TX LO leakage using circuitry on a loopback path connecting the transmitter and receiver are provided. The TX LO leakage may be estimated by measuring the DC signal on the receiver, measuring the phase difference between the received LO signal and the receiver LO signal, and filtering LO harmonics that may arise from the use of non-linear mixers. The DC signal on the receiver may be measured by opening and closing the loopback path, or changing the gain of the loopback path, or flipping the phase of looped back TX signal. The method may be used in an initialization or tracking calibration scheme.Type: GrantFiled: March 14, 2013Date of Patent: October 10, 2017Assignee: ANALOG DEVICES, INC.Inventors: Jianxun Fan, Reza Alavi, Steven R. Bal, David J. McLaurin
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Patent number: 9673847Abstract: Apparatus and methods for transceiver calibration are provided. In certain configurations, a transceiver includes a transmit channel and an observation channel. The transmit channel includes a transmit mixer that up-converts a transmit signal by a first or transmit local oscillator frequency. The observation channel includes an observation mixer that down-converts an observed signal from the transmit channel by a second or observation local oscillator frequency that is offset from the first local oscillator frequency. By observing the transmit channel using a local oscillator frequency that is offset relative to the transmit channel's local oscillator frequency, the observation channel can observe transmit channel impairments substantially independently from observation channel impairments.Type: GrantFiled: November 25, 2015Date of Patent: June 6, 2017Assignee: ANALOG DEVICES, INC.Inventors: Christopher Mayer, David J. McLaurin, Martin S. McCormick, Chris Angell, Manish J. Manglani
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Publication number: 20170149457Abstract: Apparatus and methods for transceiver calibration are provided. In certain configurations, a transceiver includes a transmit channel and an observation channel. The transmit channel includes a transmit mixer that up-converts a transmit signal by a first or transmit local oscillator frequency. The observation channel includes an observation mixer that down-converts an observed signal from the transmit channel by a second or observation local oscillator frequency that is offset from the first local oscillator frequency. By observing the transmit channel using a local oscillator frequency that is offset relative to the transmit channel's local oscillator frequency, the observation channel can observe transmit channel impairments substantially independently from observation channel impairments.Type: ApplicationFiled: November 25, 2015Publication date: May 25, 2017Inventors: Christopher Mayer, David J. McLaurin, Martin S. McCormick, Chris Angell, Manish J. Manglani
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Patent number: 9614557Abstract: A method and apparatus for phase adjustment of a RF transceiver is disclosed. Based on a first local oscillator signal and a second local oscillator signal, a beat signal that indicates the frequency and phase relationship between the first and second local oscillator signals can be generated. Using the beat signal, changing phase relationship between the first and second local oscillator signals can be cumulatively taken account for using phase averaging to allow quick restoration to observation of a previously observed channel.Type: GrantFiled: November 30, 2015Date of Patent: April 4, 2017Assignee: ANALOG DEVICES, INC.Inventors: Christopher Mayer, David J. McLaurin, Chris Angell
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Patent number: 9503109Abstract: Apparatus and methods for synchronizing phase-locked loops (PLLs) are provided. In certain implementations, a fractional-N synthesizer includes a PLL and a control circuit that controls a division value of the PLL. The control circuit includes an interpolator, a reset phase adjustment calculator, and a synchronization circuit. The interpolator can control a fractional portion of the PLL's division value. The reset phase adjustment calculator can include a counter for counting a number of cycles of the reference clock signal since initialization of the fractional-N synthesizer, and the reset phase adjustment calculator can generate a phase adjustment signal based on the count. The synchronization circuit can synchronize the PLL in response to a synchronization signal, and can correct for a synchronization phase error indicated by the phase adjustment signal.Type: GrantFiled: June 1, 2015Date of Patent: November 22, 2016Assignee: ANALOG DEVICES GLOBALInventors: David J. McLaurin, Christopher W. Angell, Michael F. Keaveney
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Patent number: 9300444Abstract: A transmission module is provided that includes a transmitter, a loopback receiver, and a QEC controller. In a first state, the QEC controller calibrates the loopback receiver to remove quadrature imbalance in the loopback receiver. In a second state, a communication pathway is provided between the transmitter and the loopback receiver, and the QEC controller identifies quadrature imbalance in the transmitter based at least one a comparison of the data signals at the output of the loopback receiver with data signals at the input of the transmitter. Based on the comparison, the QEC controller can adjust one or more characteristics of the transmitter to correct quadrature errors in the transmitter.Type: GrantFiled: July 25, 2013Date of Patent: March 29, 2016Assignee: ANALOG DEVICES, INC.Inventors: Raju Hormis, Steven R. Bal, Kevin Glenn Gard, Jianxun Fan, David J. McLaurin, Antonio Montalvo