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    • 5. 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
    • US20060140322A1
    • 2006-06-29
    • US11022883
    • 2004-12-28
    • Terence JohnsonTimothy Miller
    • Terence JohnsonTimothy Miller
    • 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。
    • 6. 发明申请
    • Circuit and method for reducing direct current biases
    • 减少直流偏压的电路和方法
    • US20060105731A1
    • 2006-05-18
    • US10990400
    • 2004-11-18
    • Terence JohnsonNitin SharmaRyan Lobo
    • Terence JohnsonNitin SharmaRyan Lobo
    • H04B1/10
    • H03D3/008H04B1/71637
    • A method is provided for reducing a DC bias in a receiver. This method includes isolating a second circuit portion from a first circuit portion (535) and determining a second DC bias correction value for the second circuit portion that will eliminate a second DC bias at the isolated second circuit portion (540). The second circuit portion is then connected to the first circuit portion (550) and a bias-maximizing code word is generated at the first circuitry (505). A first DC bias correction value is then determined that will eliminate a first DC bias at the first circuit portion (555). The bias-maximizing code word is formed such that: a first integrated value of a first half of the bias-maximizing code word has a positive value, and a second integrated value of a second half of the bias-maximizing code word over half of the code word length has a negative value.
    • 提供了一种减少接收机中的直流偏压的方法。 该方法包括从第一电路部分(535)隔离第二电路部分,并且确定将消除隔离的第二电路部分(540)处的第二DC偏置的第二电路部分的第二DC偏置校正值。 然后,第二电路部分连接到第一电路部分(550),并且在第一电路(505)处产生偏置最大化码字。 然后确定将消除第一电路部分处的第一DC偏压(555)的第一DC偏置校正值。 偏置最大化码字形成为:偏置最大化码字的前半部分的第一积分值具有正值,偏差最大化码字的第二半的第二积分值超过偏差最大化码字的一半以上 码字长度为负值。
    • 8. 发明申请
    • Circuit and method for adjusting timing alignment using programmable codes
    • 使用可编程代码调整定时对准的电路和方法
    • US20060104337A1
    • 2006-05-18
    • US10990367
    • 2004-11-18
    • Terence JohnsonTimothy MillerNitin Sharma
    • Terence JohnsonTimothy MillerNitin Sharma
    • H04B1/707
    • H04B1/7183H04B1/71632
    • A method is provided for adjusting timing alignment in which a receiver generates a plurality of imbalanced correction codes (1310), and square waves both having the same frequency. The receiver mixes the imbalanced correction codes with the square waves to create a mixed signal (1320), and integrates the mixed signal over a correction code period to generate a signal power value (1330). The receiver adjusts a phase of the square wave in a first direction when the signal power value satisfies a first criterion (1340, 1350), and in a second direction when the signal power value satisfies a second criterion (1340, 1360). Each imbalanced correction code is symmetrical. And a total integrated value of one of the imbalanced correction codes over the correction code period is either above a first threshold, or below a second threshold, the first threshold being greater than or equal to the second threshold.
    • 提供了一种用于调整接收器产生多个不平衡校正码(1310)的定时对准的方法以及具有相同频率的方波。 接收器将不平衡校正码与方波混合以产生混合信号(1320),并且通过校正码周期对混合信号进行积分以产生信号功率值(1330)。 当信号功率值满足第一标准(1340,1350)时,接收器在第一方向上调整方波的相位,并且当信号功率值满足第二标准(1340,1360)时,第二方向调整方波的相位。 每个不平衡校正码是对称的。 并且在校正码周期中不平衡校正码之一的总积分值大于第一阈值或低于第二阈值,第一阈值大于或等于第二阈值。