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    • 4. 发明授权
    • Method and system of characterization and behavioral modeling of a phase-locked loop for fast mixed signal simulation
    • 用于快速混合信号模拟的锁相环的表征和行为建模方法和系统
    • US06657500B1
    • 2003-12-02
    • US10042076
    • 2002-01-08
    • Pi-Cheng Chen
    • Pi-Cheng Chen
    • H03L700
    • G06F17/5036H03L7/0991
    • A piecewise linear phase locked loop frequency generator generates a voltage signal controlled by an input voltage. This frequency generator has a variable static frequency generator, whose frequency is selected by a control voltage and whose transfer function between control voltage and output frequency is further selected by a piecewise linear determination parameter. The piecewise linear determination parameter is the number which selects which portion of the frequency spectrum is being represented by the control voltage to frequency transfer function being selected and is a function of an input control voltage. The frequency generator has a set of n low pass filters, used to work in conjunction with the corresponding control voltage to provide frequency transfer functions which are selected by the piecewise linear determination parameter. Finally, a switch circuit is employed to select as a function of the piecewise linear determination parameter which low pass filter output should be presented as the dynamic frequency which corresponds to the original control voltage input. In addition, it is also an objective of this invention to provide a model of a phase locked loop to be simulated within a simulator to determine the function of a phase locked loop within an electronic system.
    • 分段线性锁相环频率发生器产生由输入电压控制的电压信号。 该频率发生器具有可变的静态频率发生器,其频率由控制电压选择,并且通过分段线性确定参数进一步选择控制电压和输出频率之间的传递函数。 分段线性确定参数是选择频谱的哪个部分由选择的频率传递函数的控制电压表示的数量,并且是输入控制电压的函数。 频率发生器具有一组n个低通滤波器,用于与相应的控制电压一起工作,以提供通过分段线性确定参数选择的频率传递函数。 最后,采用开关电路作为分段线性确定参数的函数来选择低通滤波器输出应当作为对应于原始控制电压输入的动态频率。 此外,本发明的目的还在于提供一种在模拟器内仿真以确定电子系统内的锁相环的功能的锁相环的模型。