Patents by Inventor Anna-Karin Stenman
Anna-Karin Stenman 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: 11356102Abstract: 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: June 23, 2021Date of Patent: June 7, 2022Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Janne Peltonen, Christian Elgaard, Anna-Karin Stenman
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Publication number: 20210391863Abstract: 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: June 23, 2021Publication date: December 16, 2021Inventors: Janne Peltonen, Christian Elgaard, Anna-Karin Stenman
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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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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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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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Publication number: 20190386613Abstract: A differential electronic circuit (25) comprising a tuning circuit (140, 140-i) connected between a first circuit node (110) and a second circuit node (112) of the electronic circuit (25), is disclosed. The tuning circuit (140, 140-i) comprises at least one controllable circuit (150, 150-i), each comprising a first MOS transistor (152) having its drain and source connected to a common node in (156) of the controllable circuit (150, 150-i) and its gate connected to a first internal node (158) of the tuning circuit (140, 140-i), and a second MOS transistor (154) having its drain and source connected to the common node (156) of the controllable circuit (150, 150-i) and its gate connected to a second internal node (160) of the tuning circuit (140, 140-i).Type: ApplicationFiled: February 10, 2017Publication date: December 19, 2019Inventor: Anna-Karin Stenman
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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: 20190229678Abstract: A crystal oscillator circuit comprises a crystal; oscillator circuitry for generating a crystal oscillation signal at an oscillation frequency; and a kick-start circuit for injecting pulses into the crystal during a start-up period. The oscillator circuitry comprises a differential pair of transistors and can operate in an oscillating mode or a start-up mode. In the oscillating mode, the differential pair of transistors is cross-coupled so that a gate terminal of one transistor is coupled to a drain terminal of the other transistor, and vice versa, and the drain terminals are coupled to the crystal to generate the crystal oscillation signal. In the start-up mode, the kick-start circuit drives the gate terminals of the transistors with said pulses. This crystal oscillator circuit has a decreased start-up time compared to prior art solutions and a reduced influence of parasitic oscillations.Type: ApplicationFiled: April 4, 2019Publication date: July 25, 2019Inventors: Anna Karin Stenman, Stefanos Stefanidis, Lars Sundström, Tahmineh Torabian Esfahani
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Patent number: 10333526Abstract: An oscillator circuit (100) comprises a crystal oscillator (10) arranged to generate an oscillation signal, a bias current generator (20) arranged to supply a bias current to the crystal oscillator (10), and a feedback stage (30) arranged to generate a feedback signal in response to an amplitude of the oscillation signal reaching an amplitude threshold. The bias current generator (20) is arranged to: in response to a supply of power to the oscillator circuit (100) 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 (10), 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: June 2, 2014Date of Patent: June 25, 2019Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Janne Peltonen, Christian Elgaard, Anna-Karin Stenman
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Patent number: 10312860Abstract: A crystal oscillator circuit comprises a crystal; oscillator circuitry for generating a crystal oscillation signal at an oscillation frequency; and a kick-start circuit for injecting pulses into the crystal during a start-up period. The oscillator circuitry comprises a differential pair of transistors and can operate in an oscillating mode or a start-up mode. In the oscillating mode, the differential pair of transistors are cross-coupled so that a gate terminal of one transistor is coupled to a drain terminal of the other transistor, and vice versa, and the drain terminals are coupled to the crystal to generate the crystal oscillation signal. In the start-up mode, the kick-start circuit drives the gate terminals of the transistors with said pulses. This crystal oscillator circuit has a decreased start-up time compared to prior art solutions and a reduced influence of parasitic oscillations.Type: GrantFiled: March 13, 2015Date of Patent: June 4, 2019Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Anna Karin Stenman, Stefanos Stefanidis, Lars Sundström, Tahmineh Torabian Esfahani
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Publication number: 20180198411Abstract: A crystal oscillator circuit comprises a crystal (X1); oscillator circuitry (31) for generating a crystal oscillation signal at an oscillation frequency; and a kick-start circuit (12) for injecting pulses into the crystal during a start-up period. The oscillator circuitry (31) comprises a differential pair of transistors (M1, M2) and can operate in an oscillating mode or a start-up mode. In the oscillating mode, the differential pair of transistors are cross-coupled so that a gate terminal of one transistor (M1) is coupled to a drain terminal of the other transistor (M2), and vice versa, and the drain terminals are coupled to the crystal (X1) to generate the crystal oscillation signal. In the start-up mode, the kick-start circuit (12) drives the gate terminals of the transistors (M1, M2) with said pulses. This crystal oscillator circuit has a decreased start-up time compared to prior art solutions and a reduced influence of parasitic oscillations.Type: ApplicationFiled: March 13, 2015Publication date: July 12, 2018Inventors: Anna Karin Stenman, Stefanos Stefanidis, Lars Sundström, Tahmineh Torabian Esfahani
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Publication number: 20170237441Abstract: An oscillator circuit (100) comprises a crystal oscillator (10) arranged to generate an oscillation signal, a bias current generator (20) arranged to supply a bias current to the crystal oscillator (10), and a feedback stage (30) arranged to generate a feedback signal in response to an amplitude of the oscillation signal reaching an amplitude threshold. The bias current generator (20) is arranged to: in response to a supply of power to the oscillator circuit (100) 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 (10), 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: June 2, 2014Publication date: August 17, 2017Inventors: Janne Peltonen, Christian Elgaard, Anna-Karin Stenman
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Patent number: 6223029Abstract: A system enabling a mobile station to provide combined mobile telephony and remote control terminal functionalities is disclosed. A mobile station includes functionalities enabling the mobile station to communicate with a Public Land Mobile Network. Furthermore, command and communication and local communications functionalities enable the mobile station to remotely control a variety of peripheral devices through user provided inputs.Type: GrantFiled: April 29, 1997Date of Patent: April 24, 2001Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Anna-Karin Stenman, Mats Pettersson, Torbjörn Gärdenfors