Patents by Inventor Patrick Joseph Pratt
Patrick Joseph Pratt 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: 11533070Abstract: Some embodiments herein describe a radio frequency power semiconductor device that include a first non-linear filter network for compensating for lower frequency noise of a power amplifier. The first non-linear filter network can include a plurality of infinite impulse response filters and corresponding corrective elements to correct for a non-linear portion of the power amplifier. The radio frequency power semiconductor device can further include a second non-linear filter network for compensating for broadband distortion. The second non-linear filter network can be connected in parallel to the first non-linear filter network. The broadband distortion can include digital predistortion and the narrowband distortion can include charge trapping effects. The first non-linear filter network can comprise Laguerre filters. The second non-linear filter network can comprise general memory polynomial filters.Type: GrantFiled: November 16, 2020Date of Patent: December 20, 2022Assignee: Analog Devices International Unlimited CompanyInventors: Patrick Joseph Pratt, Dong Chen, Mark Cope, Christopher Mayer, Praveen Chandrasekaran, Stephen Summerfield
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Patent number: 11387790Abstract: The disclosed technology relates generally to semiconductor devices, and more particularly to power semiconductor devices in which effects of charge trapping are compensated. A radio frequency (RF) power transmitter system comprises a RF power semiconductor device that outputs a time-varying gain characteristic from a RF signal input waveform originating from a digital input, wherein the time-varying gain characteristic includes a gain error associated with charge-trapping events having a memory effect on the RF power semiconductor device lasting longer than 1 microsecond. The RF power transmitter system further comprises circuitry configured to apply an analog gate bias waveform to the RF power semiconductor device based on the time-varying gain characteristic to reduce the gain error.Type: GrantFiled: January 14, 2020Date of Patent: July 12, 2022Assignee: Analog Devices International Unlimited CompanyInventors: Mark Cope, Patrick Joseph Pratt
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Publication number: 20210194521Abstract: Some embodiments herein describe a radio frequency power semiconductor device that include a first non-linear filter network for compensating for lower frequency noise of a power amplifier. The first non-linear filter network can include a plurality of infinite impulse response filters and corresponding corrective elements to correct for a non-linear portion of the power amplifier. The radio frequency power semiconductor device can further include a second non-linear filter network for compensating for broadband distortion. The second non-linear filter network can be connected in parallel to the first non-linear filter network. The broadband distortion can include digital predistortion and the narrowband distortion can include charge trapping effects. The first non-linear filter network can comprise Laguerre filters. The second non-linear filter network can comprise general memory polynomial filters.Type: ApplicationFiled: November 16, 2020Publication date: June 24, 2021Inventors: Patrick Joseph Pratt, Dong Chen, Mark Cope, Christopher Mayer, Praveen Chandrasekaran, Stephen Summerfield
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Publication number: 20200244232Abstract: The disclosed technology relates generally to semiconductor devices, and more particularly to power semiconductor devices in which effects of charge trapping are compensated. A radio frequency (RF) power transmitter system comprises a RF power semiconductor device that outputs a time-varying gain characteristic from a RF signal input waveform originating from a digital input, wherein the time-varying gain characteristic includes a gain error associated with charge-trapping events having a memory effect on the RF power semiconductor device lasting longer than 1 microsecond. The RF power transmitter system further comprises circuitry configured to apply an analog gate bias waveform to the RF power semiconductor device based on the time-varying gain characteristic to reduce the gain error.Type: ApplicationFiled: January 14, 2020Publication date: July 30, 2020Inventors: Mark Cope, Patrick Joseph Pratt
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Patent number: 10039020Abstract: A single complex calculation for locating a dominant frequency, such as an interfering signal in a frequency range, is replaced by several much easier ones. A signal is analyzed over a first frequency range to locate at least one comparatively significant frequency component therein. This can involve analyzing, using electronic hardware, a test range of frequencies to identify a potentially significant component within the test range; and determining, using electronic hardware, if a condition for finishing the analysis has been met. If the condition has not been met, the test range is modified as a result of the analysis and the operations of analyzing and determining are repeated.Type: GrantFiled: October 17, 2014Date of Patent: July 31, 2018Assignee: Analog Devices GlobalInventor: Patrick Joseph Pratt
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Patent number: 9912358Abstract: A method of reducing the noise from a transmitter at an associated receiver is disclosed. Noise contributions in active channels are identified and used to update a shared noise cancellation filter. Excluding signals from inactive channels speeds up the filter convergence to a near optimal solution. Sharing a filter across multiple channels reduces component count and power consumption.Type: GrantFiled: October 5, 2015Date of Patent: March 6, 2018Assignee: Analog Devices GlobalInventors: Patrick Joseph Pratt, Peadar Antony Forbes
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Patent number: 9735741Abstract: Aspects of this disclosure relate to a receiver for digital predistortion (DPD). The receiver includes an analog-to-digital converter (ADC) having a sampling rate that is lower than a signal bandwidth of an output of a circuit having an input that is predistorted by DPD. DPD can be updated based on feedback from the receiver. According to certain embodiments, the receiver can be a narrowband receiver configured to observe sub-bands of the signal bandwidth. In some other embodiments, the receiver can include a sub-Nyquist ADC.Type: GrantFiled: August 28, 2014Date of Patent: August 15, 2017Assignee: Analog Devices GlobalInventors: Patrick Joseph Pratt, Ronald D. Turner, Joseph B. Brannon
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Patent number: 9705465Abstract: A control apparatus is provided that can provide high dynamic resolution and is suitable for inclusion within an integrated circuit. The control apparatus receives a demand signal representing a desired value of a measurand, and a feedback signal representing a present value or a recently acquired value of the measurand. The processing circuit forms a further signal a further signal which is a function of the demand and feedback signals. The further signal is then subjected to at least an integrating function. The demand signal, feedback signal or the further signal is processed or acquired in a sampled manner. The use of such sampled, i.e. discontinuous, processing allows integration time constants to be synthesized which would otherwise require the use of unfeasibly large components within an integrated circuit, or the use of off-chop components. Both of these other options are expensive.Type: GrantFiled: August 20, 2014Date of Patent: July 11, 2017Assignee: ANALOG DEVICES GLOBALInventors: Rares Andrei Bodnar, Patrick Joseph Pratt, Donal Bourke, Peter James Tonge
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Patent number: 9667291Abstract: A system is described for forming an estimate of an unwanted signal component that may be formed as a result of non-linearities in a system. The estimate is used to form a cancellation signal which is added to an input signal to reduce the influence of the unwanted component.Type: GrantFiled: October 29, 2014Date of Patent: May 30, 2017Assignee: Analog Devices GlobalInventor: Patrick Joseph Pratt
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Publication number: 20160277046Abstract: A method of reducing the noise from a transmitter at an associated receiver is disclosed. Noise contributions in active channels are identified and used to update a shared noise cancellation filter. Excluding signals from inactive channels speeds up the filter convergence to a near optimal solution. Sharing a filter across multiple channels reduces component count and power consumption.Type: ApplicationFiled: October 5, 2015Publication date: September 22, 2016Inventors: Patrick Joseph Pratt, Peadar Antony Forbes
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Publication number: 20160065147Abstract: Aspects of this disclosure relate to a receiver for digital predistortion (DPD). The receiver includes an analog-to-digital converter (ADC) having a sampling rate that is lower than a signal bandwidth of an output of a circuit having an input that is predistorted by DPD. DPD can be updated based on feedback from the receiver. According to certain embodiments, the receiver can be a narrowband receiver configured to observe sub-bands of the signal bandwidth. In some other embodiments, the receiver can include a sub-Nyquist ADC.Type: ApplicationFiled: August 28, 2014Publication date: March 3, 2016Inventors: Patrick Joseph Pratt, Ronald D. Turner, Joseph B. Brannon
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Publication number: 20150289154Abstract: A single complex calculation for locating a dominant frequency, such as an interfering signal in a frequency range, is replaced by several much easier ones. A signal is analyzed over a first frequency range to locate at least one comparatively significant frequency component therein. This can involve analyzing, using electronic hardware, a test range of frequencies to identify a potentially significant component within the test range; and determining, using electronic hardware, if a condition for finishing the analysis has been met. If the condition has not been met, the test range is modified as a result of the analysis and the operations of analyzing and determining are repeated.Type: ApplicationFiled: October 17, 2014Publication date: October 8, 2015Inventor: Patrick Joseph Pratt
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Publication number: 20150288399Abstract: A system is described for forming an estimate of an unwanted signal component that may be formed as a result of non-linearities in a system. The estimate is used to form a cancellation signal which is added to an input signal to reduce the influence of the unwanted component.Type: ApplicationFiled: October 29, 2014Publication date: October 8, 2015Inventor: Patrick Joseph Pratt
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Publication number: 20150061769Abstract: A control apparatus is provided that can provide high dynamic resolution and is suitable for inclusion within an integrated circuit. The control apparatus receives a demand signal representing a desired value of a measurand, and a feedback signal representing a present value or a recently acquired value of the measurand. The processing circuit forms a further signal a further signal which is a function of the demand and feedback signals. The further signal is then subjected to at least an integrating function. The demand signal, feedback signal or the further signal is processed or acquired in a sampled manner. The use of such sampled, i.e. discontinuous, processing allows integration time constants to be synthesized which would otherwise require the use of unfeasibly large components within an integrated circuit, or the use of off-chop components. Both of these other options are expensive.Type: ApplicationFiled: August 20, 2014Publication date: March 5, 2015Inventors: Rares Andrei Bodnar, Patrick Joseph Pratt, Donal Bourke, Peter James Tonge
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Patent number: 6664852Abstract: An apparatus and method for controlling an output (50) of a digital system (10) comprising, for example, an output of a power amplifier (24) to minimise or neutralise nonlinearities such as limit cycles. The digital system comprises a nonlinearity means or limit cycle suppressor (16) to counter the limit cycle effect by intentionally introducing a second nonlinearity into the system (10) to suppress the limit cycle effect in the digital system (10).Type: GrantFiled: February 28, 2002Date of Patent: December 16, 2003Assignee: Motorola, Inc.Inventors: Patrick Joseph Pratt, Dale G Schwent, Thomas D Nagode
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Publication number: 20030160656Abstract: An apparatus and method for controlling an output (50) of a digital system (10) comprising, for example, an output of a power amplifier (24) to minimise or neutralise nonlinearities such as limit cycles. The digital system comprises a nonlinearity means or limit cycle suppressor (16) to counter the limit cycle effect by intentionally introducing a second nonlinearity into the system (10) to suppress the limit cycle effect in the digital system (10).Type: ApplicationFiled: February 28, 2002Publication date: August 28, 2003Inventors: Patrick Joseph Pratt, Dale G. Schwent, Thomas D. Nagode