Patents Assigned to Merus Audio ApS
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Patent number: 9979354Abstract: The present invention relates in one aspect to a class D audio amplifier with improved output driver topology supporting multi-level output signals such as 3-level, 4-level or 5-level pulse width or pulse density modulated output signals for application to a loudspeaker load. The present class D audio amplifiers are particularly well-suited for high-volume consumer audio applications and solutions.Type: GrantFiled: November 4, 2016Date of Patent: May 22, 2018Assignee: Merus Audio ApSInventor: Mikkel Høyerby
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Patent number: 9628064Abstract: A multiphase pulse width modulator (PWM) producing N mutually phase shifted PWM signals, which is well-suited for class D audio amplifier applications. The multiphase PWM includes (a) N+1 (N ?2) analog triangular waveform generators producing N+1 mutually phase shifted triangular waveforms, and (b) N+1 comparators each having a first input coupled to each of the N+1 triangular waveforms and a second input coupled to an audio signal to generate N+1 mutually phase shifted PWM phase signals. A crosspoint switch includes N+1 inputs coupled to the N+1 PWM phase signals, and N outputs to supply the N PWM signals. A crosspoint switch controller selectively connects each of the N+1 inputs to each of the N outputs for a duration of a cycle time in a time sequence to simultaneously generate the N PWM signals such that each signal has interleaved time segments of the N+1 PWM phase signals.Type: GrantFiled: September 1, 2014Date of Patent: April 18, 2017Assignee: Merus Audio ApSInventors: Allan Nogueras Nielsen, Mikkel Høyerby
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Patent number: 9564862Abstract: The present invention relates to a class D audio amplifier comprising a pulse width modulator, an adjustable loop filter and a feedback loop. The pulse width modulator generates a first set of pulse width modulated control signals at an adjustable modulation frequency for respective switch control terminals of a first output driver. A controller of the class D audio amplifier is configured to control frequency response characteristics of the adjustable loop filter based on a frequency setting of the adjustable modulation frequency.Type: GrantFiled: April 24, 2013Date of Patent: February 7, 2017Assignee: Merus Audio APSInventor: Mikkel Høyerby
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Patent number: 9515617Abstract: The present invention relates in one aspect to a class D audio amplifier with improved output driver topology supporting multi-level output signals such as 3-level, 4-level or 5-level pulse width or pulse density modulated output signals for application to a loudspeaker load. The present class D audio amplifiers are particularly well-suited for high-volume consumer audio applications and solutions.Type: GrantFiled: October 27, 2011Date of Patent: December 6, 2016Assignee: Merus Audio ApSInventor: Mikkel Høyerby
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Patent number: 9231583Abstract: The present invention relates to a gate driver for a power transistor comprising a first charging path operatively connected between a first voltage supply and a gate terminal of the power transistor for charging the gate terminal to a first gate voltage. A second charging path is connectable between the gate terminal of the power transistor and a second supply voltage to charge the gate terminal from the first gate voltage to a second gate voltage larger or higher than the first gate voltage. A voltage of the second voltage supply is higher than a voltage of the first voltage supply.Type: GrantFiled: June 13, 2012Date of Patent: January 5, 2016Assignee: MERUS AUDIO APSInventors: Mikkel Høyerby, Jørgen Kragh Jakobsen
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Publication number: 20150288335Abstract: The present invention relates to a class D audio amplifier comprising a pulse width modulator, an adjustable loop filter and a feedback loop. The pulse width modulator generates a first set of pulse width modulated control signals at an adjustable modulation frequency for respective switch control terminals of a first output driver. A controller of the class D audio amplifier is configured to control frequency response characteristics of the adjustable loop filter based on a frequency setting of the adjustable modulation frequency.Type: ApplicationFiled: April 24, 2013Publication date: October 8, 2015Applicant: Merus Audio ApSInventor: Mikkel Høyerby
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Publication number: 20140300413Abstract: The present invention relates to a gate driver for a power transistor comprising a first charging path operatively connected between a first voltage supply and a gate terminal of the power transistor for charging the gate terminal to a first gate voltage. A second charging path is connectable between the gate terminal of the power transistor and a second supply voltage to charge the gate terminal from the first gate voltage to a second gate voltage larger or higher than the first gate voltage. A voltage of the second voltage supply is higher than a voltage of the first voltage supply.Type: ApplicationFiled: June 13, 2012Publication date: October 9, 2014Applicant: Merus Audio ApSInventors: Mikkel Høyerby, Jørgen Kragh Jakobsen
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Publication number: 20130223651Abstract: The present invention relates in one aspect to a class D audio amplifier with improved output driver topology supporting multi-level output signals such as 3-level, 4-level or 5-level pulse width or pulse density modulated output signals for application to a loudspeaker load. The present class D audio amplifiers are particularly well-suited for high-volume consumer audio applications and solutions.Type: ApplicationFiled: October 27, 2011Publication date: August 29, 2013Applicant: Merus Audio ApSInventor: Mikkel Høyerby