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8 条记录 (耗时 0.026 秒)

    Conversion Architecture For Residual Spur Avoidance
    7.
    发明申请
    Conversion Architecture For Residual Spur Avoidance 审中-公开
    残余支线避免转换架构

    公开(公告)号：US20090209222A1

    公开(公告)日：2009-08-20

    申请号：US12032537

    申请日：2008-02-15

    申请人： Litong Li ,  Donald J. Dalebroux ,  Ronald J. Larrick

    发明人： Litong Li ,  Donald J. Dalebroux ,  Ronald J. Larrick

    IPC分类号： H04B1/26

    CPC分类号： H03D7/161

    摘要： A method and apparatus for residual spur avoidance is disclosed. One embodiment comprises a method of generating a first local oscillator signal, mixing the first local oscillator signal with a radio frequency signal to generate an intermediate frequency signal, filtering the intermediate frequency signal at a band-pass frequency, mixing the filtered intermediate frequency signal with a second local oscillator signal having a first frequency offset from the band-pass frequency to generate an output intermediate frequency signal, and switching the second local oscillator signal to a second frequency offset to avoid a spur generated from the first frequency offset, wherein the second frequency offset is the opposite sign but same magnitude offset from the band-pass frequency.

    摘要翻译： 公开了一种用于残余回波避免的方法和装置。 一个实施例包括产生第一本地振荡器信号的方法，将第一本地振荡器信号与射频信号混合以产生中频信号，以带通频率对中频信号进行滤波，将滤波后的中频信号与 第二本地振荡器信号具有从带通频率的第一频率偏移以产生输出中频信号，以及将第二本机振荡器信号切换到第二频率偏移以避免从第一频率偏移产生的杂散，其中第二本地振荡器信号 频偏是相反的符号，但与带通频率的偏移量相同。

    Phase-Locked Loop System and Method
    8.
    发明申请
    Phase-Locked Loop System and Method 审中-公开
    锁相环系统和方法

    公开(公告)号：US20090206892A1

    公开(公告)日：2009-08-20

    申请号：US12032570

    申请日：2008-02-15

    申请人： Litong Li

    发明人： Litong Li

    IPC分类号： H03L7/08

    CPC分类号： H03L7/18

    摘要： A phase-locked loop including a phase detector configured to receive inputs from a reference signal path and a feedback signal path and generate a phase detector output based upon such inputs. The phase-locked loop also includes an oscillator operatively coupled with the phase detector and configured to produce an oscillatory output in response to and based upon the phase detector output, and where the oscillatory output is applied to the feedback signal path. The reference signal path includes a mixer configured to mix a reference signal with output from a direct digital synthesizer; and a switching mechanism configured to selectively place one of a plurality of different filters in series between the mixer and the phase detector.

    摘要翻译： 一种锁相环，包括相位检测器，其被配置为从参考信号路径和反馈信号路径接收输入，并且基于这样的输入生成相位检测器输出。 锁相环还包括与相位检测器可操作地耦合的振荡器，并被配置为响应于并基于相位检测器输出而产生振荡输出，并且其中振荡输出被施加到反馈信号路径。 参考信号路径包括配置为将参考信号与来自直接数字合成器的输出混合的混频器; 以及开关机构，被配置为选择性地将多个不同滤波器中的一个串联地置于混合器和相位检测器之间。