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    • 2. 发明申请
    • CIRCUIT AND METHOD FOR DYNAMICALLY ADJUSTING A FILTER BANDWIDTH
    • 用于动态调整滤波器带宽的电路和方法
    • WO2006071508A2
    • 2006-07-06
    • PCT/US2005/044974
    • 2005-12-13
    • FREESCALE SEMICONDUCTOR, INC.JOHNSON, Terence, L.MILLER, Timothy, R.
    • JOHNSON, Terence, L.MILLER, Timothy, R.
    • H03D3/24
    • H03L7/093H03D13/00H03L7/0991H04L7/0004H04L7/033
    • A tracking circuit (100) is provided for controlling a locally-generated clock. A receive channel (110) in the tracking circuit receives an incoming signal and a local clock, generates a local signal based on the local clock, and compares the local signal and the incoming signal to generate a data signal and an unfiltered phase error signal. A loop filter (120) filters the unfiltered phase error signal to provide a filtered phase error signal. A numerically controlled oscillator (140) generates a correction clock based on the filtered phase error signal. And a filter control circuit (160) provides one or more filter control signals to control operational parameters of the loop filter. The correction clock is provided to the receive channel to modify at least one of the phase and frequency of the local clock. In addition, a sample switch (125) may also be provided to sample the unfiltered phase error signal.
    • 提供跟踪电路(100)用于控制本地产生的时钟。 跟踪电路中的接收通道(110)接收输入信号和本地时钟,基于本地时钟产生本地信号,并且比较本地信号和输入信号以产生数据信号和未滤波的相位误差信号。 环路滤波器(120)对未滤波的相位误差信号进行滤波以提供滤波的相位误差信号。 数控振荡器(140)基于滤波的相位误差信号产生校正时钟。 并且滤波器控制电路(160)提供一个或多个滤波器控制信号以控制环路滤波器的操作参数。 校正时钟被提供给接收通道以修改本地时钟的相位和频率中的至少一个。 此外,还可以提供采样开关(125)以对未滤波的相位误差信号进行采样。
    • 3. 发明申请
    • CIRCUIT AND METHOD FOR DYNAMICALLY ADJUSTING A FILTER BANDWIDTH
    • 用于动态调整滤波器带宽的电路和方法
    • WO2006071508A3
    • 2007-02-22
    • PCT/US2005044974
    • 2005-12-13
    • FREESCALE SEMICONDUCTOR INCJOHNSON TERENCE LMILLER TIMOTHY R
    • JOHNSON TERENCE LMILLER TIMOTHY R
    • H03D3/24
    • H03L7/093H03D13/00H03L7/0991H04L7/0004H04L7/033
    • A tracking circuit (100) is provided for controlling a locally-generated clock. A receive channel (110) in the tracking circuit receives an incoming signal and a local clock, generates a local signal based on the local clock, and compares the local signal and the incoming signal to generate a data signal and an unfiltered phase error signal. A loop filter (120) filters the unfiltered phase error signal to provide a filtered phase error signal. A numerically controlled oscillator (140) generates a correction clock based on the filtered phase error signal. And a filter control circuit (160) provides one or more filter control signals to control operational parameters of the loop filter. The correction clock is provided to the receive channel to modify at least one of the phase and frequency of the local clock. In addition, a sample switch (125) may also be provided to sample the unfiltered phase error signal.
    • 提供跟踪电路(100)用于控制本地产生的时钟。 跟踪电路中的接收通道(110)接收输入信号和本地时钟,基于本地时钟产生本地信号,并且比较本地信号和输入信号以产生数据信号和未滤波的相位误差信号。 环路滤波器(120)对未滤波的相位误差信号进行滤波以提供滤波的相位误差信号。 数控振荡器(140)基于滤波的相位误差信号产生校正时钟。 并且滤波器控制电路(160)提供一个或多个滤波器控制信号以控制环路滤波器的操作参数。 校正时钟被提供给接收通道以修改本地时钟的相位和频率中的至少一个。 此外,还可以提供采样开关(125)以对未滤波的相位误差信号进行采样。