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    • 5. 发明授权
    • High frequency fractional-N divider
    • 高频分数N分频器
    • US08093930B2
    • 2012-01-10
    • US12077651
    • 2008-03-19
    • Juan Qiao
    • Juan Qiao
    • H03B19/00
    • H03L7/193H03L7/1974
    • A divider can include a phase selection circuit that switches between a plurality of phase-separated clock signals in response to a fractional control signal to form a selected clock signal, the selected clock signal being utilized to generate a second clock signal; and a counter that receives the second clock signal and generates the fractional control signal and a transition control signal, the transition control signal indicating when the second clock signal should switch states in response to a transition of the selected clock signal, the counter generating a feed-back clock signal.
    • 分频器可以包括相位选择电路,其响应于分数控制信号在多个相位分离的时钟信号之间切换以形成所选择的时钟信号,所选择的时钟信号用于产生第二时钟信号; 以及接收第二时钟信号并产生分数控制信号和转移控制信号的计数器,转移控制信号指示第二时钟信号何时应该响应于所选择的时钟信号的转变而切换状态,计数器产生馈送 反时钟信号。
    • 6. 发明申请
    • High frequency fractional-N divider
    • 高频分数N分频器
    • US20090237128A1
    • 2009-09-24
    • US12077651
    • 2008-03-19
    • Juan Qiao
    • Juan Qiao
    • H03B19/00H03L7/06
    • H03L7/193H03L7/1974
    • A divider can include a phase selection circuit that switches between a plurality of phase-separated clock signals in response to a fractional control signal to form a selected clock signal, the selected clock signal being utilized to generate a second clock signal; and a counter that receives the second clock signal and generates the fractional control signal and a transition control signal, the transition control signal indicating when the second clock signal should switch states in response to a transition of the selected clock signal, the counter generating a feed-back clock signal.
    • 分频器可以包括相位选择电路,其响应于分数控制信号在多个相位分离的时钟信号之间切换以形成所选择的时钟信号,所选择的时钟信号用于产生第二时钟信号; 以及接收第二时钟信号并产生分数控制信号和转移控制信号的计数器,转移控制信号指示第二时钟信号何时应该响应于所选择的时钟信号的转变而切换状态,计数器产生馈送 反时钟信号。
    • 7. 发明授权
    • Phase and frequency detector with zero static phase error
    • 相位和频率检测器具有零静态相位误差
    • US07598775B2
    • 2009-10-06
    • US12004271
    • 2007-12-19
    • Pengfei HuJuan QiaoZhongyuan Chang
    • Pengfei HuJuan QiaoZhongyuan Chang
    • H03D13/00
    • H03D13/00H03L7/0891
    • A method and circuit for phase and frequency detection having zero static phase error for use in a phase-locked loop system is presented. The phase and frequency detector utilizes a first phase and frequency detector configured to generate first and second pulsed PFD signals. Pulse blocking circuitry is utilized to provide first and second output signals based on the first and second pulsed signals respectively, wherein a time period when both first and second output signals are asserted is substantially reduced from a time period when both first and second pulsed signals are asserted. By reducing the time the first and second output signals are simultaneously asserted, the effects of charge pump current source mismatch are minimized and static phase error is reduced.
    • 提出了一种用于相位和频率检测的方法和电路,具有用于锁相环系统的零静态相位误差。 相位和频率检测器利用被配置为产生第一和第二脉冲PFD信号的第一相位和频率检测器。 脉冲阻塞电路被用于分别基于第一和第二脉冲信号提供第一和第二输出信号,其中第一和第二输出信号被断言的时间周期从第一和第二脉冲信号两者的时间段大大减少 断言 通过减少第一和第二输出信号同时断言的时间,电荷泵电流源失配的影响被最小化,静态相位误差降低。
    • 8. 发明授权
    • Digital spread spectrum method based on precise phase delta-sigma algorithm
    • 基于精确相位Δ-Σ算法的数字扩频方法
    • US08009719B2
    • 2011-08-30
    • US11904895
    • 2007-09-28
    • Zhuyan ShaoJuan QiaoQichang Wu
    • Zhuyan ShaoJuan QiaoQichang Wu
    • H04B1/69
    • H04B15/02H03L7/197H03L7/23H04B2215/067
    • A method and apparatus for generating a spread spectrum reference clock is presented. A method and apparatus is presented for receiving a spread spectrum parameter from a phase lock loop, wherein the spread spectrum parameter includes a multiple-level parameter comprising a plurality of phase signals; quantizing a spread spectrum profile associated with the spread spectrum parameter; mapping the quantized profile; generating control signals based on the mapping, wherein the control signals include an integer control signal and a phase control signal; dividing a phase signal of the plurality of phase signals with the integer control signal; synchronizing the divided phase signal using the phase control signal; and providing a reference clock for a spread spectrum clock generator based on the synchronizing.
    • 提出了一种用于产生扩频参考时钟的方法和装置。 一种用于从锁相环接收扩频参数的方法和装置,其中扩频参数包括包含多个相位信号的多电平参数; 量化与扩频参数相关联的扩频谱; 绘制量化曲线; 基于所述映射生成控制信号,其中所述控制信号包括整数控制信号和相位控制信号; 用整数控制信号分割多个相位信号的相位信号; 使用相位控制信号同步分频相位信号; 以及基于同步为扩频时钟发生器提供参考时钟。