Phase lock loop and operating method thereof
    21.
    发明授权
    Phase lock loop and operating method thereof 有权
    锁相环及其操作方法

    公开(公告)号:US07511579B2

    公开(公告)日:2009-03-31

    申请号:US11455730

    申请日:2006-06-20

    CPC classification number: H03L7/113 H03L7/1972

    Abstract: A PLL is provided, comprising a first divider, a PFD, a loop filter, a VCO, a second divider and a controller. The first divider receives a reference signal and divides the reference signal by R to obtain a divided signal. The PFD compares the divided signal and a feedback signal to generate a compared The VCO selects one of a plurality of operating curves for oscillation based on a selection signal, and generates an oscillation signal based on an operating voltage generated by signal the loop filter. The second divider divides the oscillation signal by N to obtain the feedback signal. The controller operates in an initial mode to recursively determine the selection signal by calculating differences of the feedback signal and the divided signal. When the selection signal converges to stable, the PLL switches to a normal mode to operate on the corresponding operating curve.

    Abstract translation: 提供PLL,包括第一分频器,PFD,环路滤波器,VCO,第二分频器和控制器。 第一分频器接收参考信号并将参考信号除以R以获得分频信号。 PFD比较分频信号和反馈信号以产生比较VCO基于选择信号选择多个用于振荡的操作曲线中的一个,并且基于由环路滤波器的信号产生的工作电压产生振荡信号。 第二分频器将振荡信号除以N以获得反馈信号。 控制器以初始模式工作,通过计算反馈信号和分频信号的差异递归地确定选择信号。 当选择信号收敛到稳定时,PLL切换到正常模式,以对相应的工作曲线进行操作。

    Receivers gain imbalance calibration circuits and methods thereof
    24.
    发明申请
    Receivers gain imbalance calibration circuits and methods thereof 审中-公开
    接收机获得不平衡校准电路及其方法

    公开(公告)号:US20050157819A1

    公开(公告)日:2005-07-21

    申请号:US11037912

    申请日:2005-01-18

    CPC classification number: H04L27/364

    Abstract: A receiver comprising an in-phase channel circuit, a quadrature channel circuit, and a gain imbalance calibration circuit comprising a first circuit and a second circuit. The first circuit provides testing signals to the in-phase channel circuit and the quadrature channel circuit. Test resultant signals output from the in-phase channel circuit and the quadrature channel circuit are input to the second circuit. The second circuit calibrates the gain of baseband amplifiers of the in-phase channel and the quadrature channel circuit according to the offset between the test resultant signals, thereby enabling the test resultant signal of the in-phase channel circuit to be substantially equal to the test resultant signal of the quadrature channel circuit.

    Abstract translation: 一种接收机,包括同相信道电路,正交信道电路和包括第一电路和第二电路的增益不平衡校准电路。 第一个电路向同相通道电路和正交通道电路提供测试信号。 测试从同相通道电路和正交通道电路输出的合成信号输入到第二电路。 第二电路根据测试结果信号之间的偏移来校准同相信道和正交信道电路的基带放大器的增益,从而使得同相信道电路的测试结果信号基本上等于测试 正交信道电路的合成信号。

    Automatic Frequency Tuning in a Phase Lock Loop
    28.
    发明申请
    Automatic Frequency Tuning in a Phase Lock Loop 有权
    锁相环自动调频

    公开(公告)号:US20070132517A1

    公开(公告)日:2007-06-14

    申请号:US11164924

    申请日:2005-12-12

    CPC classification number: H03L7/10

    Abstract: A method for automatic frequency tuning in a phase lock loop suitable for use in multi-band VCO wireless systems having very limited initial frequency lock times is disclosed. A predetermined subset of VCOs out of a larger bank of VCOs is selected to serve as interpolation points. The interpolation point VCOs are pre-calibrated with a predetermined voltage and the resultingly generated frequency for each of the interpolation point VCOs is stored into memory as a (frequency, VCO) pair, one pair for each interpolation point VCO. When a desired frequency then is given to the system, an appropriate VCO is selected by interpolation using the (frequency, VCO) pairs of the two most adjacent interpolation points for tracking and locking.

    Abstract translation: 公开了一种适用于具有非常有限的初始频率锁定时间的多频带VCO无线系统的锁相环中的自动频率调谐方法。 选择较大的VCO组中的VCO的预定子集用作内插点。 内插点VCO以预定电压进行预校准,并且每个内插点VCO的最终产生的频率作为(频率,VCO)对存储到存储器中,对于每个内插点VCO为一对。 当给系统给出期望的频率时,通过使用用于跟踪和锁定的两个最相邻插值点的(频率,VCO)对进行插值来选择适当的VCO。

    Method and apparatus for demodulation
    29.
    发明申请
    Method and apparatus for demodulation 审中-公开
    用于解调的方法和装置

    公开(公告)号:US20060281433A1

    公开(公告)日:2006-12-14

    申请号:US11451425

    申请日:2006-06-13

    CPC classification number: H04B1/26

    Abstract: A demodulation method and apparatus are provided. An RF signal is down converted to generate a first in-phase signal and a first quadrature signal of a first frequency. Limiting amplification is performed on the first in-phase signal and the first quadrature signal to generate a second in-phase signal and a second quadrature signal. The frequency of the second in-phase and quadrature signals are up converted to a third in-phase signal and a quadrature signal of a second frequency. The third in-phase and quadrature signals are up converted to generate an intermediate frequency (IF) signal of a third frequency.

    Abstract translation: 提供了解调方法和装置。 RF信号被下变频以产生第一频率的第一同相信号和第一正交信号。 对第一同相信号和第一正交信号进行限幅放大以产生第二同相信号和第二正交信号。 第二同相和正交信号的频率被上变频为第三同相信号和第二频率的正交信号。 第三同相和正交信号被上变频以产生第三频率的中频(IF)信号。

Patent Agency Ranking