Patents by Inventor Lars Ridell Virtanen
Lars Ridell Virtanen 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: 11444579Abstract: In one aspect, a power amplifier apparatus comprising a power amplifier (PA) and an adaptive controller is provided. The PA comprises at least one transistor and the adaptive controller is configured to control a bias voltage of the transistor based on a measured power efficiency of the PA and a measure output signal quality of the PA. In another aspect, a method of optimizing PA performance is provided. The PA comprises at least one transistor and the method includes initializing a bias voltage of the transistor, receiving measurements indicating a power efficiency and an output signal quality of the PA, evaluating the received measurements, calculating a new bias voltage for the transistor based on the evaluation, and applying the calculated new bias voltage to the transistor.Type: GrantFiled: December 17, 2018Date of Patent: September 13, 2022Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Rui Hou, Andre Bleker, Lars Ridell Virtanen
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Patent number: 10951172Abstract: An amplifier arrangement for amplifying an input signal to an output signal for delivering to a load is disclosed. The amplifier arrangement comprises a power splitter configured to receive the input signal and produce split input signals. The amplifier arrangement further comprises a first amplifier branch comprising multiple main amplifier circuits. Output signals of the multiple main amplifier circuits are combined to generate a first output signal. The amplifier arrangement further comprises a second amplifier branch comprising at least one auxiliary amplifier circuit. The at least one auxiliary amplifier circuit is configured to receive a split input signal from the power splitter and produce a second output signal. The amplifier arrangement further comprises a power combiner configured to receive the first and second output signals and produce the output signal for delivering to the load.Type: GrantFiled: June 28, 2016Date of Patent: March 16, 2021Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Rui Hou, Lars Ridell Virtanen
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Publication number: 20200373886Abstract: In one aspect, a power amplifier apparatus comprising a power amplifier (PA) and an adaptive controller is provided. The PA comprises at least one transistor and the adaptive controller is configured to control a bias voltage of the transistor based on a measured power efficiency of the PA and a measure output signal quality of the PA. In another aspect, a method of optimizing PA performance is provided. The PA comprises at least one transistor and the method includes initializing a bias voltage of the transistor, receiving measurements indicating a power efficiency and an output signal quality of the PA, evaluating the received measurements, calculating a new bias voltage for the transistor based on the evaluation, and applying the calculated new bias voltage to the transistor.Type: ApplicationFiled: December 18, 2018Publication date: November 26, 2020Applicant: Telefonaktiebolaget LM Ericsson (publ)Inventors: Rui HOU, Andre BLEKER, Lars RIDELL VIRTANEN
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Patent number: 10749478Abstract: An amplifier arrangement (200) for amplifying input signals and a method for operating the amplifier arrangement are disclosed. The amplifier arrangement (200) comprises a main amplifier circuit (210) having an input and an output; a first (221) and second (222) auxiliary amplifier circuits each having an input and an output, wherein each of the first (221) and second (222) auxiliary amplifier circuits being selectively operable to operate in combination with the main amplifier circuit (210). The amplifier arrangement (200) further comprises a single hybrid coupler circuit (230) having a first port (221) being coupled to the output of the main amplifier circuit (210), a second port (232) being coupled to the output of the first auxiliary amplifier circuit (221), a third port (233) being coupled to the output of the second auxiliary amplifier circuit (222) and a fourth port (234) being coupled to the load (240) of the amplifier (200).Type: GrantFiled: May 3, 2016Date of Patent: August 18, 2020Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Rui Hou, Andre Bleker, Lars Ridell Virtanen
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Patent number: 10505247Abstract: There is provided a circulator device. The circulator device comprises two magnet-free circulators. Each magnet-free circulator has a forced time variance. The circulator device comprises ports. The two circulators are in the circulator device arranged to have mutually anti-phase time variance. Each of the two circulators is coupled to all of the ports. There is also presented an isolator device comprising such a circulator device. There is also presented a radio transceiver device comprising such a circulator device or isolator device.Type: GrantFiled: April 19, 2019Date of Patent: December 10, 2019Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Rui Hou, Lars Ridell Virtanen
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Publication number: 20190245255Abstract: There is provided a circulator device. The circulator device comprises two magnet-free circulators. Each magnet-free circulator has a forced time variance. The circulator device comprises ports. The two circulators are in the circulator device arranged to have mutually anti-phase time variance. Each of the two circulators is coupled to all of the ports. There is also presented an isolator device comprising such a circulator device. There is also presented a radio transceiver device comprising such a circulator device or isolator device.Type: ApplicationFiled: April 19, 2019Publication date: August 8, 2019Inventors: Rui Hou, Lars Ridell Virtanen
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Publication number: 20190158030Abstract: An amplifier arrangement (200) for amplifying input signals and a method for operating the amplifier arrangement are disclosed. The amplifier arrangement (200) comprises a main amplifier circuit (210) having an input and an output; a first (221) and second (222) auxiliary amplifier circuits each having an input and an output, wherein each of the first (221) and second (222) auxiliary amplifier circuits being selectively operable to operate in combination with the main amplifier circuit (210). The amplifier arrangement (200) further comprises a single hybrid coupler circuit (230) having a first port (221) being coupled to the output of the main amplifier circuit (210), a second port (232) being coupled to the output of the first auxiliary amplifier circuit (221), a third port (233) being coupled to the output of the second auxiliary amplifier circuit (222) and a fourth port (234) being coupled to the load (240) of the amplifier (200).Type: ApplicationFiled: May 3, 2016Publication date: May 23, 2019Applicant: Telefonaktiebolaget LM Ericsson (publ)Inventors: Rui HOU, Andre BLEKER, Lars RIDELL VIRTANEN
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Publication number: 20190140600Abstract: An amplifier arrangement for amplifying an input signal to an output signal for delivering to a load is disclosed. The amplifier arrangement comprises a power splitter configured to receive the input signal and produce split input signals. The amplifier arrangement further comprises a first amplifier branch comprising multiple main amplifier circuits. Output signals of the multiple main amplifier circuits are combined to generate a first output signal. The amplifier arrangement further comprises a second amplifier branch comprising at least one auxiliary amplifier circuit. The at least one auxiliary amplifier circuit is configured to receive a split input signal from the power splitter and produce a second output signal. The amplifier arrangement further comprises a power combiner configured to receive the first and second output signals and produce the output signal for delivering to the load.Type: ApplicationFiled: June 28, 2016Publication date: May 9, 2019Inventors: Rui Hou, Lars Ridell Virtanen
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Patent number: 10270149Abstract: There is provided a circulator device. The circulator device comprises two magnet-free circulators. Each magnet-free circulator has a forced time variance. The circulator device comprises ports. The two circulators are in the circulator device arranged to have mutually anti-phase time variance. Each of the two circulators is coupled to all of the ports. There is also presented an isolator device comprising such a circulator device. There is also presented a radio transceiver device comprising such a circulator device or isolator device.Type: GrantFiled: April 22, 2016Date of Patent: April 23, 2019Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Rui Hou, Lars Ridell Virtanen
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Publication number: 20180123204Abstract: There is provided a circulator device. The circulator device comprises two magnet-free circulators. Each magnet-free circulator has a forced time variance. The circulator device comprises ports. The two circulators are in the circulator device arranged to have mutually anti-phase time variance. Each of the two circulators is coupled to all of the ports. There is also presented an isolator device comprising such a circulator device. There is also presented a radio transceiver device comprising such a circulator device or isolator device.Type: ApplicationFiled: April 22, 2016Publication date: May 3, 2018Inventors: Rui Hou, Lars Ridell Virtanen
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Patent number: 9425756Abstract: It is presented an amplifier device comprising: a primary amplifier arranged to receive at least part of an input signal; a secondary amplifier arranged to receive at least part of the input signal; a first directional coupler device, wherein one input of the first directional coupler device is connected to the primary amplifier and a second input of the first directional coupler device is connected to the secondary amplifier; and a first multiband termination device arranged to reflect signals with a predetermined reflection phase in at least two frequency bands. One output of the first directional coupler device is a main output of the amplifier device and a second output of the first directional coupler device is connected to the first multiband termination device. A corresponding radio base station and mobile communication terminal are also presented.Type: GrantFiled: July 5, 2012Date of Patent: August 23, 2016Assignee: Telefonaktiebolaget LM Ericsson (Publ)Inventors: Daniel Åkesson, Lars Ridell Virtanen
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Publication number: 20150188504Abstract: It is presented an amplifier device comprising: a primary amplifier arranged to receive at least part of an input signal; a secondary amplifier arranged to receive at least part of the input signal; a first directional coupler device, wherein one input of the first directional coupler device is connected to the primary amplifier and a second input of the first directional coupler device is connected to the secondary amplifier; and a first multiband termination device arranged to reflect signals with a predetermined reflection phase in at least two frequency bands. One output of the first directional coupler device is a main output of the amplifier device and a second output of the first directional coupler device is connected to the first multiband termination device. A corresponding radio base station and mobile communication terminal are also presented.Type: ApplicationFiled: July 5, 2012Publication date: July 2, 2015Applicant: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)Inventors: Daniel Åkesson, Lars Ridell Virtanen