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    Amplifier power attenuator and closed loop operation
    25.
    发明授权
    Amplifier power attenuator and closed loop operation 有权

    公开(公告)号：US12068731B2

    公开(公告)日：2024-08-20

    申请号：US17884697

    申请日：2022-08-10

    Applicant: D'Amore Engineering, LLC

    Inventor： Anthony T. D'Amore ,  Juan Rodriguez

    IPC: H03F3/183 ,  G06F3/16 ,  H03G3/30 ,  H04R3/02

    CPC classification number: H03G3/3005 ,  G06F3/162 ,  H03F3/183 ,  H04R3/02 ,  H03F2200/03 ,  H03G2201/106

    Abstract: An amplifier power attenuator utilizes an amplified audio feedback signal from an audio amplifier (which is driving a loudspeaker), along with a user-set impedance and a maximum voltage set-point reflective of the operational parameters of the loudspeaker, to attenuate an audio signal prior to amplification thereby preventing damage to the loudspeaker. The impedance of a variable impedance optocoupler is changed to adjust the attenuation of the audio signal to one of a plurality of predetermined attenuation levels responsive to an error between a voltage level of the feedback signal and the maximum voltage set-point. The error is reflected in a counter value having a linear or non-linear relationship with the error dependent upon a magnitude of the error; the counter value is assessed against a plurality of target values associated with respective ones of the predetermined attenuation levels to identify the attenuation to be applied to the audio signal.

    Enhancing TX-TX isolation through digital pre-compensation
    27.
    发明授权
    Enhancing TX-TX isolation through digital pre-compensation 有权

    公开(公告)号：US11757479B2

    公开(公告)日：2023-09-12

    申请号：US17489381

    申请日：2021-09-29

    Applicant: Texas Instruments Incorporated

    Inventor： Sarma Sundareswara Gunturi ,  Venkateshwara Reddy Pothapu ,  Chandrasekhar Sriram ,  Raju Kharataram Chaudhari ,  Sai Vaibhav Batchu ,  Pankaj Gaur

    IPC: H04B1/04 ,  H03G3/30

    CPC classification number: H04B1/0475 ,  H03G3/3036 ,  H03G2201/106

    Abstract: A TX-TX pre-compensation system that estimates unwanted coupling in a victim transmit chain caused by an aggressor transmit chain and injects a pre-compensation signal to cancel out the estimated coupling. In some embodiments, a signal measurement module estimates the amplitude, phase, and envelope delay of the coupling and an isolation pre-compensation module generates the pre-compensation signal based on the estimated amplitude, the estimated phase, the estimated envelope delay, and the difference between the carrier frequencies of the transmit chains. Since the phase of the coupling may be affected by the carrier frequency of the transmit chains, in some embodiments the phase of the pre-compensation signal is adjusted in response to a change in carrier frequency. Since the amplitude of the coupling may be affected by attenuator gain settings, in some embodiments the amplitude of the pre-compensation signal may be adjusted in response to a change in attenuator gain setting.

    VARIABLE ATTENUATOR
    28.
    发明申请
    VARIABLE ATTENUATOR 审中-公开

    公开(公告)号：US20180241375A1

    公开(公告)日：2018-08-23

    申请号：US15903220

    申请日：2018-02-23

    Applicant: SUMITOMO ELECTRIC DEVICE INNOVATIONS, INC.

    Inventor： Akio Oya ,  Makoto Kondo

    IPC: H03H11/24 ,  H01P1/22 ,  H03H7/25

    CPC classification number: H03H11/245 ,  H01P1/22 ,  H03G1/0052 ,  H03G1/007 ,  H03G2201/106 ,  H03H7/253

    Abstract: A variable attenuator (v-ATT) is disclosed. The v-ATT includes an input terminal, an output terminal, a transmission line between the input and output terminals, at least two stages provided between the transmission line and the ground, and a bias unit. Each of the stages includes a field effect transistor (FET) that varies impedance between the transmission line and the ground according to a bias provided to the gate thereof. The bias unit generates the biases each provided to the stages. One of the features of the v-ATT is that at least one of the stages receives at least one of the biases that is different from biases provided to other of the at least one of the stages.

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