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    Complementary variable gain amplification
    1.
    发明授权
    Complementary variable gain amplification 有权

    公开(公告)号：US10651807B2

    公开(公告)日：2020-05-12

    申请号：US16115475

    申请日：2018-08-28

    Applicant: Qualcomm Incorporated

    Inventor： Timothy Donald Gathman ,  Chirag Dipak Patel ,  Lai Kan Leung ,  Xinmin Yu

    IPC: H03F3/04 ,  H03F1/22 ,  H03F3/68 ,  H03F1/02 ,  H03F3/195

    Abstract: An apparatus is disclosed for complementary variable gain amplification. In an example aspect, the apparatus includes a variable gain amplifier that includes multiple amplifiers. The multiple amplifiers include at least one first amplifier and at least one second amplifier cascaded together in series. The first amplifier includes a first set of transistors having a first doping type. At least a portion of the first set of transistors is configured to implement a first current mirror. The second amplifier includes a second set of transistors having a second doping type. At least a portion of the second set of transistors is configured to implement a second current mirror. The second current mirror is coupled to the first current mirror.

    Polyphase filter with interphase coupling
    4.
    发明授权
    Polyphase filter with interphase coupling 有权

    公开(公告)号：US11632098B2

    公开(公告)日：2023-04-18

    申请号：US17211716

    申请日：2021-03-24

    Applicant: Qualcomm Incorporated

    Inventor： Timothy Donald Gathman ,  Lai Kan Leung ,  Chirag Dipak Patel ,  Xinmin Yu ,  Rajagopalan Rangarajan

    IPC: H03H11/22 ,  H03H11/04

    Abstract: An example apparatus includes a polyphase transconductance-capacitor filter. The polyphase filter includes a DC bias voltage node, a plus in-phase filter unit, a minus in-phase filter unit, a plus quadrature-phase filter unit, and a minus quadrature-phase filter unit. Each filter unit respectively includes an input node, an output node, and a control node. The polyphase filter also includes a plus in-phase switch and a minus in-phase switch. The plus in-phase switch is coupled to the control node of the plus in-phase filter unit, the DC bias voltage node, and the input node of one or both of the plus quadrature-phase filter unit and the minus quadrature-phase filter unit. The minus in-phase switch is coupled to the control node of the minus in-phase filter unit, the DC bias voltage node, and the input node of one or both of the plus quadrature-phase filter unit and the minus quadrature-phase filter unit.

    Multi-band radio-frequency reception
    5.
    发明授权
    Multi-band radio-frequency reception 有权

    公开(公告)号：US10193580B2

    公开(公告)日：2019-01-29

    申请号：US15927022

    申请日：2018-03-20

    Applicant: QUALCOMM Incorporated

    Inventor： Chirag Dipak Patel ,  Lai Kan Leung ,  Xinmin Yu ,  Timothy Donald Gathman ,  Ravi Sridhara

    IPC: H04B1/00 ,  H03F3/72 ,  H03F3/24 ,  H03F1/42 ,  H04B1/06 ,  H04B1/719

    Abstract: Devices and techniques are described to extract specific frequency band signals from a wide-band radio-frequency signal. A network entity may include an antenna for receiving the wide-band radio-frequency signal and may include a receiver circuit for processing the wide-band radio-frequency signal. The receiver circuit may include a transconductance amplifier and a plurality of single-band circuits. The transconductance amplifier may be configured to generate an amplified wide-band radio-frequency signal and send it to one or more of the single-band circuits. Each single-band circuit may be configured to extract a different frequency band signal from the amplified wide-band radio-frequency signal.

    Reconfigurable amplifier
    8.
    发明授权
    Reconfigurable amplifier 有权

    公开(公告)号：US11683062B2

    公开(公告)日：2023-06-20

    申请号：US17404948

    申请日：2021-08-17

    Applicant: QUALCOMM Incorporated

    Inventor： Janakiram Sankaranarayanan ,  Jun Tan ,  Lai Kan Leung ,  Timothy Donald Gathman ,  Mehmet Ipek ,  Ojas Choksi

    IPC: H04B1/18 ,  H03F3/19

    CPC classification number: H04B1/18 ,  H03F3/19 ,  H03F2200/294 ,  H03F2200/451

    Abstract: A reconfigurable amplifier includes a first transistor having a gate coupled to an input of the reconfigurable amplifier, and a source coupled to a ground. The reconfigurable amplifier also includes a gate control circuit, and a second transistor having a gate coupled to the gate control circuit, a source coupled to a drain of the first transistor, and a drain coupled to an output of the reconfigurable amplifier, wherein the gate control circuit is configured to output a bias voltage to the gate of the second transistor in a cascode mode, and output a switch voltage to the gate of the second transistor in a non-cascode mode. The reconfigurable amplifier further includes a load coupled to the output of the reconfigurable amplifier.

    Complementary current-mode biquad with high linearity
    9.
    发明授权
    Complementary current-mode biquad with high linearity 有权

    公开(公告)号：US11296678B1

    公开(公告)日：2022-04-05

    申请号：US17136723

    申请日：2020-12-29

    Applicant: QUALCOMM Incorporated

    Inventor： Timothy Donald Gathman ,  Lai Kan Leung

    IPC: H03H11/00 ,  H03H11/04

    Abstract: Certain aspects of the present disclosure provide methods and apparatus for processing signals using a current-mode biquad filter, which may have a tunable bias current and/or tunable capacitance. One example apparatus is a current-mode biquad filter circuit that includes a first input current node, a first capacitive element coupled to the first input current node, a first output current node, a first active filter circuit coupled between the first input current node and the first output current node, and a second active filter circuit coupled between the first input current node and the first output current node. The second active filter circuit is complementary to the first active filter circuit.

    ENHANCED BROADBAND OPERATION OF AN ACTIVE MIXER
    10.
    发明申请
    ENHANCED BROADBAND OPERATION OF AN ACTIVE MIXER 审中-公开

    公开(公告)号：US20180159474A1

    公开(公告)日：2018-06-07

    申请号：US15831370

    申请日：2017-12-04

    Applicant: QUALCOMM Incorporated

    Inventor： Xinmin Yu ,  Timothy Donald Gathman ,  Lai Kan Leung

    IPC: H03D7/14

    CPC classification number: H03D7/1491 ,  H03B2200/0062 ,  H03D7/1425 ,  H03D7/1441 ,  H03D7/1458 ,  H03D2200/0043 ,  H04B1/26

    Abstract: Methods, systems, and devices for wireless communication are described for enhanced broadband operation of an active mixer. In an example, an apparatus may include an active mixer that converts between radio frequency (RF) signals and intermediate frequency (IF) signals based at least in part on an alternating current (AC) local oscillator (LO) signal, wherein a direct current (DC) current generated within the active mixer is dependent in part on a bias voltage and the AC LO signal. The apparatus may include a mixer biasing circuit that generates the bias voltage for the active mixer, a magnitude of the bias voltage having an inverse relationship to an amplitude of the AC LO signal.

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