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    LOW LATENCY FREQUENCY SWITCHING
    24.
    发明申请
    LOW LATENCY FREQUENCY SWITCHING 审中-公开

    公开(公告)号：WO2004040787A3

    公开(公告)日：2004-05-13

    申请号：PCT/US2003/034784

    申请日：2003-10-31

    Applicant: QUALCOMM INCORPORATED

    Inventor： SHIU, Da-shan ,  ZHANG, Li ,  SY, Eugene ,  MALDONADO, David ,  DHALIWAL, Upkar

    IPC: H04B1/40

    Abstract: Techniques for improved low latency frequency switching are disclosed. In one embodiment, a controller (510) receives a frequency switch command and generates a frequency switch signal at a time determined in accordance with a system timer (520). In another embodiment, gain calibration is initiated subsequent to the frequency switch signal delayed by the expected frequency synthesizer settling time. In yet another embodiment, DC cancellation control (540) and gain control (530) are iterated to perform gain calibration, with signaling to control the iterations without need for processor (550) intervention. Various other embodiments are also presented. Aspects of the embodiments disclosed may yield the benefit of reducing latency during frequency switching, allowing for increased measurements at alternate frequencies, reduced time spent on alternate frequencies, and the capacity and throughput improvements that follow from minimization of disruption of an active communication session and improved neighbor selection.

    DUAL BANDWIDTH PHASE LOCK LOOP FILTERS FOR MULTIMODE RADIOS
    25.
    发明申请
    DUAL BANDWIDTH PHASE LOCK LOOP FILTERS FOR MULTIMODE RADIOS 审中-公开

    公开(公告)号：WO2003065584A3

    公开(公告)日：2003-08-07

    申请号：PCT/US2003/002517

    申请日：2003-01-28

    Applicant: QUALCOMM INCORPORATED

    Inventor： MALDONADO, David

    IPC: H03L7/093

    Abstract: An apparatus and method for filtering a signal in a phase lock loop is disclosed. An typical apparatus for filtering a phase error signal comprises a first filter subcircuit receiving a phase error signal from a phase comparator and filtering the error signal when enabled, a second filter subcircuit receiving the phase error signal from the phase comparator and filtering the error signal when enabled and first and second enable switches which are activated in combination to control filtering of the error signal. The first filter subcircuit is enabled by activating a first combination of the enable switches and the second filter subcircuit is enabled by activating a second combination of the enable switches. A fast acquisition subcircuit can also be used to temporarily underdampen the filter and improve overall performance of the phase lock loop circuit. The filter can be used to obtain multimode operation in a cellular radio.

    DUAL BAND ANTENNA
    28.
    发明公开
    DUAL BAND ANTENNA 失效
    双频带天线

    公开(公告)号：EP0896748A1

    公开(公告)日：1999-02-17

    申请号：EP97921428.0

    申请日：1997-04-28

    Applicant: QUALCOMM INCORPORATED

    Inventor： MALDONADO, David

    IPC: H01Q5 ,  H01Q9 ,  H01Q21

    CPC classification number: H01Q21/30 ,  H01Q5/40

    Abstract: A novel and improved dual band antenna system comprising an inner antenna element surrounded by an outer antenna element. In a first embodiment, the inner antenna element radiates and receives RF signals in a first RF band, and the outer antenna element radiates and receives RF signals in a second RF band. Optionally, the inner and outer antennas may be coupled together when operating in the first RF band in order to improve the antenna gain pattern of the dual band antenna. In a second embodiment, the inner antenna element radiates and receives RF signals in both the first and second RF bands. In this second embodiment, when operating in the second RF band, the outer antenna element is grounded, thus altering the signal length of the inner antenna element to resonate in the second RF band.

    Abstract translation: 一种新型和改进的双频带天线系统（100），包括由外部天线元件（104）包围的内部天线元件（102）。 在第一实施例中，内部天线元件（102）在第一RF频带中辐射和接收RF信号，并且外部天线元件（104）在第二RF频带中辐射和接收RF信号。 可选地，当在第一RF频带中操作时，内部天线和外部天线可以耦合在一起，以改善双频带天线（100）的天线增益模式。 在第二实施例中，内部天线元件（102）在第一和第二RF频带两者中辐射和接收RF信号。 在该第二实施例中，当在第二RF频带中操作时，外部天线元件（104）接地，从而改变内部天线元件（102）的信号长度以在第二RF频带中谐振。

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