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    • 165. 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。
    • 168. 发明申请
    • CLOCK DATA RECOVERY WITH SELECTABLE PHASE CONTROL
    • 时钟数据恢复与可选择的相位控制
    • WO2003021786A1
    • 2003-03-13
    • PCT/US2002/026778
    • 2002-08-23
    • RAMBUS INC.
    • CHANG, Kun-Yung, K.WEI, Jason, C.PERINO, Donald, V.
    • H03L7/085
    • H03L7/0805H03L7/07H03L7/0814H03L7/089H03L7/091H04L7/0004H04L7/0337H04L7/10
    • A clock data recovery (CDR) circuit to recover a clock signal and data signal from an input signal. The CDR circuit includes a control circuit, a select circuit and a phase adjust circuit. The control circuit generates a first control signal according to a phase relationship between the input signal and a first clock signal. The select circuit is coupled to receive the first control signal from the control circuit and coupled to receive a second control signal. The select circuit is responsive to a select signal to select either the first control signal or the second control signal to be output as a selected control signal. The phase adjust circuit is coupled to receive the selected control signal from the select circuit, the phase adjust circuit being responsive to the selected control signal to adjust the phase of the first clock signal.
    • 一种用于从输入信号恢复时钟信号和数据信号的时钟数据恢复(CDR)电路。 CDR电路包括控制电路,选择电路和相位调整电路。 控制电路根据输入信号和第一时钟信号之间的相位关系产生第一控制信号。 耦合选择电路以从控制电路接收第一控制信号并耦合以接收第二控制信号。 选择电路响应于选择信号来选择要输出的第一控制信号或第二控制信号作为选择的控制信号。 相位调整电路被耦合以从选择电路接收所选择的控制信号,相位调整电路响应所选择的控制信号来调节第一时钟信号的相位。
    • 170. 发明申请
    • CLOCK RECOVERY CIRCUIT
    • 时钟恢复电路
    • WO2002091649A2
    • 2002-11-14
    • PCT/US2002/013937
    • 2002-05-03
    • COREOPTICS, INC.
    • DORSCHKY, ClausKUPFER, Theodor
    • H04L
    • H03L7/07H03L7/095H03L7/10H03L7/107H04L7/0004H04L7/033
    • A clock recovery circuit for use with a high-speed data signal having a low signal to noise ratio is disclosed. The circuit includes a first phase locked loop circuit operating in a fast acquisition mode for acquiring the clock from a data signal, a second phase locked loop circuit for operating in a normal mode to recover the clock signal in the digital data signal once the first phase locked loop circuit has acquired the clock from the data signal, and a switch circuit responsive to switch control signals for switching between the first phase locked loop circuit and the second phase locked loop circuit after the first phase locked loop circuit has acquired the digital data signal.
    • 公开了一种与具有低信噪比的高速数据信号一起使用的时钟恢复电路。 该电路包括以快速获取模式工作的第一锁相环电路,用于从数据信号获取时钟;第二锁相环电路,用于在正常模式下操作,以在第一阶段中恢复数字数据信号中的时钟信号 锁定环电路已经从数据信号获取时钟,以及开关电路,其响应于在第一锁相环电路已经获取数字数据信号之后在第一锁相环电路和第二锁相环电路之间切换的开关控制信号 。