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    AMPLIFIER CIRCUIT AND METHOD OF OPERATING AMPLIFIER CIRCUIT
    1.
    发明公开
    AMPLIFIER CIRCUIT AND METHOD OF OPERATING AMPLIFIER CIRCUIT 审中-公开

    公开(公告)号：US20240283406A1

    公开(公告)日：2024-08-22

    申请号：US18571211

    申请日：2022-03-22

    申请人： Telefonaktiebolaget LM Ericsson (publ)

    发明人： Rui HOU ,  Richard HELLBERG ,  Andre BLEKER

    IPC分类号： H03F1/02 ,  H01P5/18 ,  H03F3/24

    CPC分类号： H03F1/0288 ,  H01P5/18 ,  H03F3/245 ,  H03F2200/204 ,  H03F2200/451

    摘要： An amplifier circuit is comprising a first amplifier configured to receive a first signal, a second amplifier configured to receive a second signal, a third amplifier configured to receive a third signal, and a directional coupler. An output of the first amplifier is connected to a first port of the directional coupler, an output of the third amplifier is connected to a second port of the directional coupler, an output of the second amplifier is connected to a third port of the directional coupler, and a fourth port of the directional coupler is connected to an output of the amplifier circuit. The directional coupler is configured such that different proportions of output signals of the second and third amplifiers are coupled to the first port of the directional coupler.

    ULTRA-WIDEBAND CREST FACTOR REDUCTION
    2.
    发明申请
    ULTRA-WIDEBAND CREST FACTOR REDUCTION 有权

    公开(公告)号：US20210176107A1

    公开(公告)日：2021-06-10

    申请号：US17052330

    申请日：2019-05-24

    申请人： TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

    发明人： Rui HOU ,  Leonard REXBERG ,  Bo GÖRANSSON ,  Richard HELLBERG ,  Mats KLINGBERG ,  Stefan ENGSTRÖM

    IPC分类号： H04L27/26 ,  H04L25/03 ,  H04B1/04

    摘要： Systems and methods for ultra-wideband Crest Factor Reduction (CFR) are provided. In some embodiments, a method performed by a wireless node for performing CFR includes performing a first CFR step on a plurality of input signals at a first sampling rate with joint peak detection and band-specific noise shaping; and performing a second CFR step on the resulting plurality of input signals at a second sampling rate with joint peak detection and joint noise shaping where the second sampling rate is higher than the first sampling rate. In this way, Peak-to-Average Power Ratio (PAPR) reduction may be increased while the computational complexity is reduced.

    RADIO TRANSMITTER AS WELL AS METHOD AND CONTROLLER THEREFOR
    3.
    发明公开
    RADIO TRANSMITTER AS WELL AS METHOD AND CONTROLLER THEREFOR 审中-公开

    公开(公告)号：US20230370110A1

    公开(公告)日：2023-11-16

    申请号：US18029795

    申请日：2020-10-02

    申请人： Telefonaktiebolaget LM Ericsson (publ)

    发明人： Ling QIN ,  Rui HOU

    IPC分类号： H04B1/525

    CPC分类号： H04B1/525 ,  H04B2001/0408

    摘要： A radio transmitter as well as a method and a controller therefor are disclosed. According to an embodiment, the radio transmitter comprises a power amplifier, a filter unit, a circulator, a switch and a reflection cancellation unit. The filter unit is capable of filtering an output from the power amplifier during a downlink time division duplex (TDD) slot and filtering an uplink signal during an uplink TDD slot. The circulator has a first port coupled to the power amplifier, a second port coupled to the filter unit, and a third port coupled to the switch. The switch is capable of coupling the third port of the circulator to a termination load during the downlink TDD slot and coupling the third port of the circulator to an uplink reception path during the uplink TDD slot. The reflection cancellation unit is coupled between the switch and the termination load and is capable of generating a first reflection signal that propagates to the first port of the circulator via the switch and the third port of the circulator during the downlink TDD slot.

    SUPER-LINEAR POWER AMPLIFIERS WITH ADAPTIVE BIASING
    5.
    发明申请
    SUPER-LINEAR POWER AMPLIFIERS WITH ADAPTIVE BIASING 审中-公开

    公开(公告)号：US20200373886A1

    公开(公告)日：2020-11-26

    申请号：US16958032

    申请日：2018-12-18

    申请人： Telefonaktiebolaget LM Ericsson (publ)

    发明人： Rui HOU ,  Andre BLEKER ,  Lars RIDELL VIRTANEN

    IPC分类号： H03F1/02 ,  H03F3/21 ,  H03F3/58

    摘要： 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.