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    Local oscillator leakage control in direct conversion processes
    1.
    发明专利
    Local oscillator leakage control in direct conversion processes 有权
    直接转换过程中的局部振荡器泄漏控制

    公开(公告)号：JP2008306759A

    公开(公告)日：2008-12-18

    申请号：JP2008203318

    申请日：2008-08-06

    Applicant: Qualcomm Inc ,  クゥアルコム・インコーポレイテッドQualcomm Incorporated

    Inventor： PETERZELL PAUL E ,  MALDONADO DAVID ,  GARD KEVIN ,  SEE PUAY HOE ANDREW ,  DUNWORTH JEREMY D ,  SAHOTA KAMAL

    IPC: H03L7/183 ,  H04B1/26 ,  H04B1/30

    Abstract: PROBLEM TO BE SOLVED: To provide local oscillator leakage control in direct conversion processes. SOLUTION: A system and method for generating a local oscillator (LO) frequency in a zero intermediate frequency (IF) receiver or transmitter is presented. A signal is received from a voltage controlled oscillator (VCO). The signal has a VCO frequency. The VCO frequency is divided by a number N to produce a signal having a divided-down frequency. The signal having the VCO frequency is then mixed with the signal having the divided-down frequency to produce an output signal having an output frequency. Local oscillator leakage is reduced. Thus, the receiver or transmitter may operate in multiple wireless communication bands and modes and meet the associated specifications. COPYRIGHT: (C)2009,JPO&INPIT

    Abstract translation: 要解决的问题：在直接转换过程中提供本地振荡器泄漏控制。 提出了一种用于在零中频（IF）接收机或发射机中产生本地振荡器（LO）频率的系统和方法。 从压控振荡器（VCO）接收信号。 该信号具有VCO频率。 将VCO频率除以数字N以产生具有分频的信号。 然后将具有VCO频率的信号与具有分频频率的信号混合，以产生具有输出频率的输出信号。 本地振荡器泄漏减少。 因此，接收机或发射机可以在多个无线通信频带和模式中操作并满足相关规范。 版权所有（C）2009，JPO＆INPIT

    2.
    发明专利
    未知

    公开(公告)号：AT381815T

    公开(公告)日：2008-01-15

    申请号：AT02713398

    申请日：2002-01-10

    Applicant: QUALCOMM INC

    Inventor： PETERZELL PAUL ,  MALDONADO DAVID ,  GARD KEVIN ,  SEE PUAY HOE ,  DUNWORTH JEREMY ,  SAHOTA KAMAL

    IPC: H03L7/183 ,  H04B1/30 ,  G01N33/14 ,  H03D3/00 ,  H04B1/40

    Abstract: A system and method for generating a local oscillator (LO) frequency in a zero intermediate frequency (IF) receiver or transmitter is presented. A signal is received from a voltage controlled oscillator (VCO). The signal has a VCO frequency. The VCO frequency is divided by a number N to produce a signal having a divided-down frequency. The signal having the VCO frequency is then mixed with the signal having the divided-down frequency to produce an output signal having an output frequency. Local oscillator leakage is reduced. Thus, the receiver or transmitter may operate in multiple wireless communication bands and modes and meet the associated specifications.

    SYSTEM AND METHOD FOR POWER CONTROL CALIBRATION IN A WIRELESS COMMUNICATION DEVICE
    3.
    发明专利
    SYSTEM AND METHOD FOR POWER CONTROL CALIBRATION IN A WIRELESS COMMUNICATION DEVICE 未知

    公开(公告)号：CA2451320A1

    公开(公告)日：2003-01-03

    申请号：CA2451320

    申请日：2002-06-25

    Applicant: QUALCOMM INC

    Inventor： SAHOTA KAMAL

    IPC: H03G3/20 ,  H03G3/30 ,  H04B1/00 ,  H04B1/04 ,  H04B1/40 ,  H04B1/707 ,  H04B7/005 ,  H04B7/26 ,  H04B17/00

    Abstract: A technique for calibrating the open-loop transmit power of a wireless communication device overcomes the inherent nonlinearities in the gain contr ol input of a variable gain amplifier (VGA). In one embodiment, a feedback circuit generates a signal indicative of the transmit power. This signal is compared with a desired transmit power level, which comprises an open-loop gain component and a closed-loop gain component. The desired transmit power level is compared with the actual transmit power level and an error signal i s generated. The error signal is used to alter the gain of the VGA in the transmitter to thereby adjust the actual transmit power level to correspond with the desired transmit power level. In alternative embodiment, the receiv er portion, which also contains a VGA, is pre-calibrated in a conventional manner. During a transmitter calibration process, the transmitter is coupled to the receiver input through a mixer and filter. The pre-calibrated receive r determines the actual transmit power level. The difference is used to genera te error correction data to adjust for non linearities in the gain control inpu t of the transmitter VGA.

    4.
    发明专利
    未知

    公开(公告)号：AT381838T

    公开(公告)日：2008-01-15

    申请号：AT00976923

    申请日：2000-11-03

    Applicant: QUALCOMM INC

    Inventor： SAHOTA KAMAL

    IPC: H04L27/20 ,  H04L27/36 ,  H03B27/00 ,  H03D7/14 ,  H03D7/16 ,  H04L27/00 ,  H04L27/22 ,  H04L27/38

    Abstract: A modulator includes two modulation units and a summer (412c). Each of the first and second modulation units receives and modulates a set of carrier signals (ILO, QLO) with a set of information signals (IIN, QIN) in accordance with a particular modulation scheme to generate a respective modulated component, with the second modulated component (b) including a signal inversion relative to the first modulation component (a). The summer combines the first (a) and second (b) modulated components to generate a modulated signal. Each modulation unit can include a pair of mixers (410a, 410b; 410c, 410d) and a summer (412a; 412b). The first mixer (410a) receives and modulates an inphase carrier signal (ILO) with a first information signal (IIN). The second mixer (410b) receives and modulates a quadrature carrier signal with a second information signal (QIN). The summer (412a) receives and combines the outputs from the first and second mixers to provide the modulated component. The information signals provided to the first and second modulation units are swapped and may be inverted.

    8.
    发明专利
    未知

    公开(公告)号：AT415736T

    公开(公告)日：2008-12-15

    申请号：AT00976898

    申请日：2000-11-03

    Applicant: QUALCOMM INC

    Inventor： WALKER BRETT ,  SAHOTA KAMAL

    IPC: H03G3/30 ,  H03G3/10 ,  H04B1/04

    Abstract: Techniques for adjusting the bias current of an active circuit in a transmitter based on the signal gain of the transmitter. The bias current affects various performances including linearity, noise figure, frequency response, and others. The amount of bias current that provides the required level of performance is dependent on the power level, which can be inferred from the gain control signals used to control the variable gain elements in the transmit signal path. Initially, at least one gain control signal for at least one variable gain element in the transmit signal path is received, with each gain control signal being indicative of an amplitude of a signal to be operated on by the active circuit. The bias current of the active circuit is then adjusted in accordance with the received gain control signal(s). To ensure proper circuit performance, the bias current can be limited to within a range defined by an upper value Imax and a lower value Imin can be set to a percentage of Imax. Imax and Imin can be generated by programmable current sources, and can also be compensated for temperature and power supply variations.

    9.
    发明专利
    未知

    公开(公告)号：BR0206415A

    公开(公告)日：2004-10-19

    申请号：BR0206415

    申请日：2002-01-10

    Applicant: QUALCOMM INC

    Inventor： PETERZELL PAUL E ,  MALDONADO DAVID ,  GARD KEVIN ,  SEE ANDREW PUAY HOE ,  DUNWORTH JEREMY D ,  SAHOTA KAMAL

    IPC: H03L7/183 ,  G01N33/14 ,  H03D3/00 ,  H04B1/30 ,  H04B1/40

    Abstract: A system and method for generating a local oscillator (LO) frequency in a zero intermediate frequency (IF) receiver or transmitter is presented. A signal is received from a voltage controlled oscillator (VCO). The signal has a VCO frequency. The VCO frequency is divided by a number N to produce a signal having a divided-down frequency. The signal having the VCO frequency is then mixed with the signal having the divided-down frequency to produce an output signal having an output frequency. Local oscillator leakage is reduced. Thus, the receiver or transmitter may operate in multiple wireless communication bands and modes and meet the associated specifications.

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