Patents by Inventor Christian Elgaard
Christian Elgaard 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: 11152945Abstract: A frequency generation solution controls an oscillator amplitude using two feedback paths to generate high frequency signals with lower power consumption and lower noise. A first feedback path provides continuous control of the oscillator amplitude responsive to an amplitude detected at the oscillator output. A second feedback path provides discrete control of the amplitude regulating parameter(s) of the oscillator responsive to the detected oscillator amplitude. Because the second feedback path enables the adjustment of the amplitude regulating parameter(s), the second feedback path enables an amplifier in the first feedback path to operate at a reduced gain, and thus also at a reduced power and a reduced noise, without jeopardizing the performance of the oscillator.Type: GrantFiled: April 29, 2020Date of Patent: October 19, 2021Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Christian Elgaard, Lars Sundström
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Patent number: 11095335Abstract: An integrated circuit is disclosed. The integrated circuit includes a set of transceivers comprising a plurality of transceivers, all configured to transmit in the same transmit frequency band and receive in the same receive frequency band. Furthermore, the integrated circuit has a set of frequency synthesizers including a separate frequency synthesizer associated with each transceiver in the set of transceivers, wherein each frequency synthesizer in the set is configured to generate a local-oscillator (LO) signal to its associated transceiver. Moreover, the integrated circuit includes a control circuit configured to control the set of frequency synthesizers such that nearest neighbors in the set of frequency synthesizers generate LO signals at different frequencies (f1, f2, f3, f4).Type: GrantFiled: June 22, 2017Date of Patent: August 17, 2021Assignee: Telefonaktiebolaget LM Ericsson (Publ)Inventors: Lars Sundström, Staffan Ek, Christian Elgaard
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Publication number: 20210247798Abstract: An integrated circuit (10, 10a-d) is disclosed, which is configured to be connected to an antenna module (3) having multiple antenna elements (17). The integrated circuit (10, 10a-d) comprises a plurality of communications circuits (50j), each of which is configured to be connected to an antenna element (17) of the antenna module (3). It also comprises a first clock input terminal (551) configured to receive a reference clock signal from outside the integrated circuit (10, 10a-d) and a first clock-distribution network (601) connected between the first clock input terminal (551) and a first subset (651) of the communication circuits (50j). Furthermore, it comprises a second clock input terminal (552) configured to receive a reference clock signal from outside the integrated circuit (10, 10a-d) and a second clock-distribution network (601) connected between the second clock input terminal (552) and a second subset (652) of the communication circuits (50j).Type: ApplicationFiled: April 27, 2021Publication date: August 12, 2021Inventors: Christian Elgaard, Magnus Åström, Fredrik Tillman
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Patent number: 11070213Abstract: An oscillator circuit comprises a crystal oscillator arranged to generate an oscillation signal, a bias current generator arranged to supply a bias current to the crystal oscillator, and a feedback stage arranged to generate a feedback signal in response to an amplitude of the oscillation signal reaching an amplitude threshold. The bias current generator is arranged to: in response to a supply of power to the oscillator circuit being switched on, generate the bias current at an increasing level commencing from a first level; in response to the feedback signal, terminate the increasing; and during subsequent oscillation of the crystal oscillator, supply the bias current at a second level dependent on a final level of the bias current reached when the increasing is terminated.Type: GrantFiled: September 22, 2020Date of Patent: July 20, 2021Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Janne Peltonen, Christian Elgaard, Anna-Karin Stenman
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Patent number: 11016526Abstract: An integrated circuit (10, 10a-d) is disclosed, which is configured to be connected to an antenna module (3) having multiple antenna elements (17). The integrated circuit (10, 10a-d) comprises a plurality of communications circuits (50j), each of which is configured to be connected to an antenna element (17) of the antenna module (3). It also comprises a first clock input terminal (551) configured to receive a reference clock signal from outside the integrated circuit (10, 10a-d) and a first clock-distribution network (601) connected between the first clock input terminal (551) and a first subset (651) of the communication circuits (50j). Furthermore, it comprises a second clock input terminal (552) configured to receive a reference clock signal from outside the integrated circuit (10, 10a-d) and a second clock-distribution network (601) connected between the second clock input terminal (552) and a second subset (652) of the communication circuits (50j).Type: GrantFiled: August 4, 2020Date of Patent: May 25, 2021Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Christian Elgaard, Magnus Åström, Fredrik Tillman
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Publication number: 20210104349Abstract: An integrated transformer arrangement for combining output signals of multiple differential power amplifiers to a single-ended load. The integrated transformer arrangement comprises a first transformer branch comprising an inductor loop. The inductor loop comprises a set of N windings connected in series. The first transformer branch further comprises a number of primary inductors. Each primary inductor comprises a winding placed concentrically to one winding of the inductor loop, and each primary inductor is configured to couple to a differential output of one of the multiple differential power amplifiers. The integrated transformer arrangement further comprises a secondary inductor comprising a winding placed concentrically to a winding of the inductor loop, and the secondary inductor is configured to couple to the single-ended load.Type: ApplicationFiled: April 10, 2017Publication date: April 8, 2021Inventors: Henrik Sjöland, Andreas Axholt, Christian Elgaard
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Publication number: 20210028749Abstract: A power amplifier, for a transmitter circuit is disclosed, which comprises at least one field-effect transistor having a gate terminal and a bulk terminal. The at least one field-effect transistor is configured to receive an input voltage at the gate terminal and a dynamic bias voltage at the bulk terminal. The power amplifier comprises a bias-voltage generation circuit configured to generate the dynamic bias voltage as a nonlinear function of an envelope of input signal. The input voltage is a linear function of the input signal. The bias-voltage generation circuit comprises a rectifier circuit configured to generate a rectified input voltage and an amplifier circuit, operatively connected to the rectifier circuit, configured to generate the dynamic bias voltage based on the rectified input voltage. The amplifier circuit is a variable-gain amplifier circuit and the power amplifier comprises a control circuit configured to tune the gain of the amplifier circuit.Type: ApplicationFiled: October 13, 2020Publication date: January 28, 2021Inventors: Christian Elgaard, Stefan Andersson, Andreas Axholt, Imad ud Din
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Publication number: 20210006252Abstract: An oscillator circuit comprises a crystal oscillator arranged to generate an oscillation signal, a bias current generator arranged to supply a bias current to the crystal oscillator, and a feedback stage arranged to generate a feedback signal in response to an amplitude of the oscillation signal reaching an amplitude threshold. The bias current generator is arranged to: in response to a supply of power to the oscillator circuit being switched on, generate the bias current at an increasing level commencing from a first level; in response to the feedback signal, terminate the increasing; and during subsequent oscillation of the crystal oscillator, supply the bias current at a second level dependent on a final level of the bias current reached when the increasing is terminated.Type: ApplicationFiled: September 22, 2020Publication date: January 7, 2021Inventors: Janne Peltonen, Christian Elgaard, Anna-Karin Stenman
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Patent number: 10868543Abstract: An oscillator circuit comprises a crystal oscillator arranged to generate an oscillation signal, a bias current generator arranged to supply a bias current to the crystal oscillator, and a feedback stage arranged to generate a feedback signal in response to an amplitude of the oscillation signal reaching an amplitude threshold. The bias current generator is arranged to: in response to a supply of power to the oscillator circuit being switched on, generate the bias current at an increasing level commencing from a first level; in response to the feedback signal, terminate the increasing; and during subsequent oscillation of the crystal oscillator, supply the bias current at a second level dependent on a final level of the bias current reached when the increasing is terminated.Type: GrantFiled: May 15, 2019Date of Patent: December 15, 2020Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Janne Peltonen, Christian Elgaard, Anna-Karin Stenman
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Publication number: 20200389136Abstract: A power amplifier arrangement comprises a power amplifier comprising at least one transistor having a first gate and a second gate. The first gate is configured to receive a radio frequency input signal superimposed with a first control signal, and the second gate is configured to receive a second control signal. The first control signal is a linearization signal varying in relation to an envelope of the input signal and the second control signal is a temperature compensation signal varying in relation to a temperature of the power amplifier, or vice versa.Type: ApplicationFiled: January 17, 2018Publication date: December 10, 2020Inventors: Christian Elgaard, Stefan Andersson, Lars Sundström
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Patent number: 10848108Abstract: A power amplifier (20) for a transmitter circuit (10) is disclosed. The power amplifier (20) comprises at least one field-effect transistor (100, 100n, 100p) having a gate terminal (110, 110n, 110p) and a bulk terminal (120, 120n, 120p), wherein the at least one field-effect transistor (100, 100n, 100n) is configured to receive an input voltage at the gate terminal (110, 110p, 110n) and a dynamic bias voltage at the bulk terminal (120, 120n, 120p). Furthermore, the power amplifier (20) comprises a bias-voltage generation circuit (130). The input voltage is a linear function of an input signal. The bias-voltage generation circuit (130) is configured to generate the dynamic bias voltage as a nonlinear function of an envelope of the input signal.Type: GrantFiled: October 14, 2016Date of Patent: November 24, 2020Assignee: Telefonaktiebolaget LM Ericsson (Publ)Inventors: Christian Elgaard, Stefan Andersson, Andreas Axholt, Imad ud Din
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Publication number: 20200363833Abstract: An integrated circuit (10, 10a-d) is disclosed, which is configured to be connected to an antenna module (3) having multiple antenna elements (17). The integrated circuit (10, 10a-d) comprises a plurality of communications circuits (50j), each of which is configured to be connected to an antenna element (17) of the antenna module (3). It also comprises a first clock input terminal (551) configured to receive a reference clock signal from outside the integrated circuit (10, 10a-d) and a first clock-distribution network (601) connected between the first clock input terminal (551) and a first subset (651) of the communication circuits (50j). Furthermore, it comprises a second clock input terminal (552) configured to receive a reference clock signal from outside the integrated circuit (10, 10a-d) and a second clock-distribution network (601) connected between the second clock input terminal (552) and a second subset (652) of the communication circuits (50j).Type: ApplicationFiled: August 4, 2020Publication date: November 19, 2020Inventors: Christian Elgaard, Magnus Åström, Fredrik Tillman
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Patent number: 10826500Abstract: An oscillator circuit comprises a crystal oscillator arranged to generate an oscillation signal, a bias current generator arranged to supply a bias current to the crystal oscillator, and a feedback stage arranged to generate a feedback signal in response to an amplitude of the oscillation signal reaching an amplitude threshold. The bias current generator is arranged to: in response to a supply of power to the oscillator circuit being switched on, generate the bias current at an increasing level commencing from a first level; in response to the feedback signal, terminate the increasing; and during subsequent oscillation of the crystal oscillator, supply the bias current at a second level dependent on a final level of the bias current reached when the increasing is terminated.Type: GrantFiled: May 15, 2019Date of Patent: November 3, 2020Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Janne Peltonen, Christian Elgaard, Anna-Karin Stenman
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Patent number: 10775835Abstract: An integrated circuit (10, 10a-d) is disclosed, which is configured to be connected to an antenna module (3) having multiple antenna elements (17). The integrated circuit (10, 10a-d) comprises a plurality of communications circuits (50j), each of which is configured to be connected to an antenna element (17) of the antenna module (3). It also comprises a first clock input terminal (551) configured to receive a reference clock signal from outside the integrated circuit (10, 10a-d) and a first clock-distribution network (601) connected between the first clock input terminal (551) and a first subset (651) of the communication circuits (50j). Furthermore, it comprises a second clock input terminal (552) configured to receive a reference clock signal from outside the integrated circuit (10, 10a-d) and a second clock-distribution network (601) connected between the second clock input terminal (552) and a second subset (652) of the communication circuits (50j).Type: GrantFiled: August 11, 2017Date of Patent: September 15, 2020Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Christian Elgaard, Magnus Åström, Fredrik Tillman
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Publication number: 20200259494Abstract: A frequency generation solution controls an oscillator amplitude using two feedback paths to generate high frequency signals with lower power consumption and lower noise. A first feedback path provides continuous control of the oscillator amplitude responsive to an amplitude detected at the oscillator output. A second feedback path provides discrete control of the amplitude regulating parameter(s) of the oscillator responsive to the detected oscillator amplitude. Because the second feedback path enables the adjustment of the amplitude regulating parameter(s), the second feedback path enables an amplifier in the first feedback path to operate at a reduced gain, and thus also at a reduced power and a reduced noise, without jeopardizing the performance of the oscillator.Type: ApplicationFiled: April 29, 2020Publication date: August 13, 2020Inventors: Christian Elgaard, Lars Sundström
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Publication number: 20200241590Abstract: An integrated circuit (10, 10a-d) is disclosed, which is configured to be connected to an antenna module (3) having multiple antenna elements (17). The integrated circuit (10, 10a-d) comprises a plurality of communications circuits (50j), each of which is configured to be connected to an antenna element (17) of the antenna module (3). It also comprises a first clock input terminal (551) configured to receive a reference clock signal from outside the integrated circuit (10, 10a-d) and a first clock-distribution network (601) connected between the first clock input terminal (551) and a first subset (651) of the communication circuits (50j). Furthermore, it comprises a second clock input terminal (552) configured to receive a reference clock signal from outside the integrated circuit (10, 10a-d) and a second clock-distribution network (601) connected between the second clock input terminal (552) and a second subset (652) of the communication circuits (50j).Type: ApplicationFiled: August 11, 2017Publication date: July 30, 2020Inventors: Christian Elgaard, Magnus Åström, Fredrik Tillman
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Patent number: 10673441Abstract: A frequency generation solution controls an oscillator amplitude using two feedback paths to generate high frequency signals with lower power consumption and lower noise. A first feedback path provides continuous control of the oscillator amplitude responsive to an amplitude detected at the oscillator output. A second feedback path provides discrete control of the amplitude regulating parameter(s) of the oscillator responsive to the detected oscillator amplitude. Because the second feedback path enables the adjustment of the amplitude regulating parameter(s), the second feedback path enables an amplifier in the first feedback path to operate at a reduced gain, and thus also at a reduced power and a reduced noise, without jeopardizing the performance of the oscillator.Type: GrantFiled: January 11, 2019Date of Patent: June 2, 2020Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Christian Elgaard, Lars Sundström
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Publication number: 20200145041Abstract: An integrated circuit is disclosed. The integrated circuit includes a set of transceivers comprising a plurality of transceivers, all configured to transmit in the same transmit frequency band and receive in the same receive frequency band. Furthermore, the integrated circuit has a set of frequency synthesizers including a separate frequency synthesizer associated with each transceiver in the set of transceivers, wherein each frequency synthesizer in the set is configured to generate a local-oscillator (LO) signal to its associated transceiver. Moreover, the integrated circuit includes a control circuit configured to control the set of frequency synthesizers such that nearest neighbors in the set of frequency synthesizers generate LO signals at different frequencies (f1, f2, f3, f4).Type: ApplicationFiled: June 22, 2017Publication date: May 7, 2020Inventors: Lars SUNDSTRÖM, Staffan EK, Christian ELGAARD
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Publication number: 20190268002Abstract: An oscillator circuit comprises a crystal oscillator arranged to generate an oscillation signal, a bias current generator arranged to supply a bias current to the crystal oscillator, and a feedback stage arranged to generate a feedback signal in response to an amplitude of the oscillation signal reaching an amplitude threshold. The bias current generator is arranged to: in response to a supply of power to the oscillator circuit being switched on, generate the bias current at an increasing level commencing from a first level; in response to the feedback signal, terminate the increasing; and during subsequent oscillation of the crystal oscillator, supply the bias current at a second level dependent on a final level of the bias current reached when the increasing is terminated.Type: ApplicationFiled: May 15, 2019Publication date: August 29, 2019Inventors: Janne Peltonen, Christian Elgaard, Anna-Karin Stenman
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Publication number: 20190245493Abstract: A power amplifier (20) for a transmitter circuit (10) is disclosed. The power amplifier (20) comprises at least one field-effect transistor (100, 100n, 100p) having a gate terminal (110, 110n, 110p) and a bulk terminal (120, 120n, 120p), wherein the at least one field-effect transistor (100, 100n, 100n) is configured to receive an input voltage at the gate terminal (110, 110p, 110n) and a dynamic bias voltage at the bulk terminal (120, 120n, 120p). Furthermore, the power amplifier (20) comprises a bias-voltage generation circuit (130). The input voltage is a linear function of an input signal. The bias-voltage generation circuit (130) is configured to generate the dynamic bias voltage as a nonlinear function of an envelope of the input signal.Type: ApplicationFiled: October 14, 2016Publication date: August 8, 2019Inventors: Christian Elgaard, Stefan Andersson, Andreas Axholt, Imad ud Din