Patents by Inventor Malcolm Blyth
Malcolm Blyth 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: 20230396167Abstract: Control circuitry for controlling a current through an inductor of a power converter, the control circuitry comprising: comparison circuitry configured to compare a measurement signal, indicative of a current through the inductor during a charging phase of the power converter, to a signal indicative of a target average current through the inductor for the charging phase and to output a comparison signal based on said comparison; detection circuitry configured to detect, based on the comparison signal, a crossing time indicative of a time at which the current through the inductor during the charging phase is equal to the target average current for the charging phase; and current control circuitry configured to control a current through the inductor during a subsequent charging phase based on the crossing time.Type: ApplicationFiled: August 22, 2023Publication date: December 7, 2023Applicant: Cirrus Logic International Semiconductor Ltd.Inventor: Malcolm BLYTH
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Patent number: 11784565Abstract: Control circuitry for controlling a current through an inductor of a power converter, the control circuitry comprising: comparison circuitry configured to compare a measurement signal, indicative of a current through the inductor during a charging phase of the power converter, to a signal indicative of a target average current through the inductor for the charging phase and to output a comparison signal based on said comparison; detection circuitry configured to detect, based on the comparison signal, a crossing time indicative of a time at which the current through the inductor during the charging phase is equal to the target average current for the charging phase; and current control circuitry configured to control a current through the inductor during a subsequent charging phase based on the crossing time.Type: GrantFiled: April 30, 2021Date of Patent: October 10, 2023Assignee: Cirrus Logic Inc.Inventor: Malcolm Blyth
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Publication number: 20230198396Abstract: Circuitry for estimating an inductance of an inductor in power converter circuitry, the circuitry comprising: circuitry for generating a peak inductor current signal indicative of a peak inductor current during an operational cycle of the power converter circuitry; circuitry for generating a ripple current estimate signal, indicative of an estimate of a ripple current in the power converter circuitry; and circuitry for applying the ripple current estimate signal to the peak inductor current signal to generate an average inductor current threshold signal indicative of an estimated average inductor current in the power converter circuitry during the operational cycle, wherein the ripple current estimate signal is based on: a duration of a charging phase of operation of the power converter circuitry; a voltage across the inductor; and an inductance value for the inductor; and wherein the circuitry for generating the ripple current estimate signal is operative to select an inductance value for the inductor for whType: ApplicationFiled: March 21, 2022Publication date: June 22, 2023Applicant: Cirrus Logic International Semiconductor Ltd.Inventors: John B. BOWLERWELL, Alastair M. BOOMER, Holger HAIPLIK, Malcolm BLYTH
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Publication number: 20220368325Abstract: This application relates to methods and apparatus for driving a transducer with switching drivers. A switching driver has first and second supply node for receiving supply voltages and includes an output bridge stage, a capacitor and a network of switches. The network of switches is operable in different switch states to provide different switching voltages to the output bridge stage. A controller is configured to control the switch state of the network of switches and a duty cycle of output switches of the output bridge stage based on an input signal to generate an output signal for driving the transducer.Type: ApplicationFiled: July 27, 2022Publication date: November 17, 2022Applicant: Cirrus Logic International Semiconductor Ltd.Inventors: Axel THOMSEN, Eric J. KING, Thomas H. HOFF, John L. MELANSON, Angus BLACK, Ross C. MORGAN, Malcolm BLYTH
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Publication number: 20220037999Abstract: Control circuitry for controlling a current through an inductor of a power converter, the control circuitry comprising: comparison circuitry configured to compare a measurement signal, indicative of a current through the inductor during a charging phase of the power converter, to a signal indicative of a target average current through the inductor for the charging phase and to output a comparison signal based on said comparison; detection circuitry configured to detect, based on the comparison signal, a crossing time indicative of a time at which the current through the inductor during the charging phase is equal to the target average current for the charging phase; and current control circuitry configured to control a current through the inductor during a subsequent charging phase based on the crossing time.Type: ApplicationFiled: April 30, 2021Publication date: February 3, 2022Applicant: Cirrus Logic International Semiconductor Ltd.Inventor: Malcolm BLYTH
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Patent number: 9800206Abstract: Methods and apparatus for detection and tracking of a signal envelope. The circuit comprises absolute value circuitry configured to receive data samples and output a first value corresponding to the magnitude of said data samples. An envelope tracker maintains an envelope output value and compares the first value to the current envelope output value and modifies the envelope output value based on said comparison to provide the envelope output value with predetermined attack and decay characteristics. The absolute value circuitry has a first input for receiving a first digital signal at a first sample rate and a second input for receiving an interpolated version of the first digital signal at a second sample rate which is higher than the first sample rate and outputs the first value based on the magnitudes of the samples received at the first input and the samples received at the second input.Type: GrantFiled: May 26, 2016Date of Patent: October 24, 2017Assignee: Cirrus Logic, Inc.Inventors: Malcolm Blyth, Graeme Gordon Mackay
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Publication number: 20160276984Abstract: Methods and apparatus for detection and tracking of a signal envelope. The circuit comprises absolute value circuitry configured to receive data samples and output a first value corresponding to the magnitude of said data samples. An envelope tracker maintains an envelope output value and compares the first value to the current envelope output value and modifies the envelope output value based on said comparison to provide the envelope output value with predetermined attack and decay characteristics. The absolute value circuitry has a first input for receiving a first digital signal at a first sample rate and a second input for receiving an interpolated version of the first digital signal at a second sample rate which is higher than the first sample rate and outputs the first value based on the magnitudes of the samples received at the first input and the samples received at the second input.Type: ApplicationFiled: May 26, 2016Publication date: September 22, 2016Applicant: Cirrus Logic International Semiconductor Ltd.Inventors: Malcolm BLYTH, Graeme Gordon MACKAY
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Patent number: 9362875Abstract: Methods and apparatus for detection and tracking of a signal envelope. The circuit comprises absolute value circuitry configured to receive data samples and output a first value corresponding to the magnitude of said data samples. An envelope tracker maintains an envelope output value and compares the first value to the current envelope output value and modifies the envelope output value based on said comparison to provide the envelope output value with predetermined attack and decay characteristics. The absolute value circuitry has a first input for receiving a first digital signal at a first sample rate and a second input for receiving an interpolated version of the first digital signal at a second sample rate which is higher than the first sample rate and outputs the first value based on the magnitudes of the samples received at the first input and the samples received at the second input.Type: GrantFiled: July 2, 2014Date of Patent: June 7, 2016Assignee: Cirrus Logic, Inc.Inventors: Malcolm Blyth, Graeme Gordon Mackay
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Publication number: 20150008962Abstract: Methods and apparatus for detection and tracking of a signal envelope. The circuit comprises absolute value circuitry configured to receive data samples and output a first value corresponding to the magnitude of said data samples. An envelope tracker maintains an envelope output value and compares the first value to the current envelope output value and modifies the envelope output value based on said comparison to provide the envelope output value with predetermined attack and decay characteristics. The absolute value circuitry has a first input for receiving a first digital signal at a first sample rate and a second input for receiving an interpolated version of the first digital signal at a second sample rate which is higher than the first sample rate and outputs the first value based on the magnitudes of the samples received at the first input and the samples received at the second input.Type: ApplicationFiled: July 2, 2014Publication date: January 8, 2015Applicant: Wolfson Microelectronics plcInventors: Malcolm Blyth, Graeme Gordon Mackay