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    LMS ADAPTIVE FILTER FOR DIGITAL CANCELLATION OF SECOND ORDER INTER-MODULATION DUE TO TRANSMITTER LEAKAGE
    1.
    发明公开
    LMS ADAPTIVE FILTER FOR DIGITAL CANCELLATION OF SECOND ORDER INTER-MODULATION DUE TO TRANSMITTER LEAKAGE 审中-公开
    LMS自适应滤波器，数字调抑制互调二阶DUE TO SENDER泄漏

    公开(公告)号：EP2127100A1

    公开(公告)日：2009-12-02

    申请号：EP08744184.6

    申请日：2008-03-21

    申请人： Skyworks Solutions, Inc.

    发明人： KAHRIZI, Masoud ,  KOMAILI, Jaleh ,  VASA, John, E.

    IPC分类号： H04B1/10 ,  H04B15/02

    CPC分类号： H04B1/525 ,  H04B1/30

    摘要： A transmit signal second-order inter-modulation (IM2) canceller for a portable handset using a full duplex mode of operation (e.g., WCDMA) is used to controllably reduce IM2 introduced by a transmit signal that appears in a received signal in a receive channel of the portable handset. The transmit signal IM2 canceller includes a delay estimator and a digital signal adjuster. The delay estimator receives a first input from a receive channel and a second input from a transmit channel. The delay estimator generates an estimate of the IM2 that the transmit channel introduces in the receive channel. The digital signal adjuster removes the estimate of the IM2 before forwarding a modified receive channel signal to a baseband subsystem of the portable handset.

    CIRCUITS, SYSTEMS, AND METHODS FOR MANAGING AUTOMATIC GAIN CONTROL IN QUADRATURE SIGNAL PATHS OF A RECEIVER
    5.
    发明公开
    CIRCUITS, SYSTEMS, AND METHODS FOR MANAGING AUTOMATIC GAIN CONTROL IN QUADRATURE SIGNAL PATHS OF A RECEIVER 审中-公开
    电路，系统用于管理自动增益控制正交信号路径的接收方法

    公开(公告)号：EP2386144A2

    公开(公告)日：2011-11-16

    申请号：EP10729435.7

    申请日：2010-01-06

    申请人： Skyworks Solutions, Inc.

    发明人： KOMAILI, Jaleh ,  VASA, John, E. ,  OBKIRCHER, Thomas

    IPC分类号： H04B1/12

    CPC分类号： H04L27/3809 ,  H03G3/3089 ,  H04L27/2647

    摘要： A system provides closed-loop gain control in a WCDMA mode and open loop control in an EDGE/GSM mode. Gain control is distributed across analog devices and a digital sealer in a wireless receiver. In the WCDMA mode, a loop filter generates an error signal that is forwarded to analog and digital control paths. The analog control path includes a first adder, a programmable hysteresis element, and a lookup table. The analog control signal is responsive to thresholds, which when used in conjunction with a previous gain value determine a new gain value. The digital control path includes a second adder, a programmable delay element, and a converter. A control word is responsive to a difference of the error signal, a calibration value, and the analog control signal. Blocker detection is provided in the WCDMA mode of operation. A controller sets system parameters using a state machine.

    ADAPTIVE PREDISTORTION FOR CONTROLLING AN OPEN LOOP POWER AMPLIFIER
    6.
    发明公开
    ADAPTIVE PREDISTORTION FOR CONTROLLING AN OPEN LOOP POWER AMPLIFIER 有权
    自适应预失真用于控制开环功率放大器

    公开(公告)号：EP2055013A2

    公开(公告)日：2009-05-06

    申请号：EP07837283.6

    申请日：2007-08-24

    申请人： Skyworks Solutions, Inc.

    发明人： KOMAILI, Jaleh ,  VASA, John, E. ,  DAMGAARD, Morten ,  RIPLEY, David, S.

    IPC分类号： H04B1/04

    CPC分类号： H04B1/0475 ,  H03F1/3241 ,  H03F1/3288 ,  H03F3/195 ,  H03F3/24 ,  H03F2201/3233 ,  H04B2001/0425

    摘要： An adaptive predlstortlon system for controlling an open loop power amplifier includes a transmitter, a receiver, a phase and amplitude determination element configured to determine amplitude, and phase characteristics of an output signal generated In the transmitter, an amplitude resampling element to generate an updated AM-AM predlstortlon signal based on the output signal generated In the transmitter, and an amplitude predlstortlon element to compare the updated AM-AM predlstortlon signal with a factory-calibrated AM-A predlstortlon signal and generate an amplitude compensation signal. The adaptive predlslortlon system Includes a phase comparison element configured to compare the signal representing transmitter characteristics with a desired phase signal, a phase resampling lement configured to generate an updated AM-PM predlstortlon signal based on the output signal generated In the transmitter, and a hasθ predistortlon element configured to compare the updated AM-PM predlstortlon signal with a factory-calibrated AM-PM redlstortlon signal and generate a phase compensation signal.