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    • 2. 发明申请
    • DATA-LEVEL CLOCK RECOVERY
    • 数据级时钟恢复
    • WO2005029743A2
    • 2005-03-31
    • PCT/US2004/029347
    • 2004-09-08
    • RAMBUS INC.STOJANOVIC, Vladimir, M.
    • STOJANOVIC, Vladimir, M.
    • H04L
    • H04L7/0331H04L7/0087H04L7/0334H04L7/0337
    • A circuit for adjusting the phase of a clock signal. A first sampling circuit generates a sequence of data samples in response to transitions of the clock signal, each of the data samples having either a first state or a second state according to whether an incoming signal exceeds a first threshold. An second sampling circuit generates an error sample in response to one of the transitions of the clock signal, the error sample having either the first state or the second state according to whether the incoming signal exceeds a second threshold. A phase adjust circuit adjusts the phase of the clock signal if the sequence of data samples matches a predetermined pattern and based, at least in part, on whether the error sample has the first state or the second state.
    • 用于调整时钟信号相位的电路。 第一采样电路响应于时钟信号的转变而生成数据样本序列,根据输入信号是否超过第一阈值,每个数据样本具有第一状态或第二状态。 第二采样电路根据输入信号是否超过第二阈值,响应于时钟信号的转换之一产生误差采样,该误差采样具有第一状态或第二状态。 如果数据样本序列与预定模式匹配并且至少部分地基于该误差样本是否具有第一状态或第二状态,则相位调整电路调整时钟信号的相位。
    • 5. 发明申请
    • LINEAR TRANSFORMATION CIRCUITS
    • 线性变换电路
    • WO2007024446A2
    • 2007-03-01
    • PCT/US2006/030411
    • 2006-08-02
    • RAMBUS INC.AMIRKHANY, AmirSTOJANOVIC, Vladimir, M.ALON, EladZERBE, Jared, L.HOROWITZ, Mark, A.
    • AMIRKHANY, AmirSTOJANOVIC, Vladimir, M.ALON, EladZERBE, Jared, L.HOROWITZ, Mark, A.
    • G06F17/14
    • G06F17/141G06J1/005
    • A transform circuit includes a first circuit and a second circuit. The first circuit and the second circuit implement first and second mappings that together generate a pre-defined transform of N digital data symbols. The first circuit maps a set of N digital data symbols from N parallel data streams to N analog data symbols by generating N sets of first weighted sums of the N digital data symbols. Each respective first weighted sum is defined by a respective set of pre-determined first weighting values in a first matrix. The second circuit maps the N analog data symbols to a sequence of N output signals over N time intervals. Each of the N output signals corresponds to a respective second weighted sum of the N analog data symbols. Each respective second weighted sum is defined by a respective set of pre-determined second weighting values in a second matrix.
    • 变换电路包括第一电路和第二电路。 第一电路和第二电路实现一起产生N个数字数据符号的预定义变换的第一和第二映射。 第一电路通过产生N个数字数据符号的第一加权和的N组,将来自N个并行数据流的一组N个数字数据符号映射到N个模拟数据符号。 每个相应的第一加权和由第一矩阵中的预定的第一加权值的相应集合来定义。 第二电路在N个时间间隔内将N个模拟数据符号映射到N个输出信号的序列。 N个输出信号中的每一个对应于N个模拟数据符号的相应的第二加权和。 每个相应的第二加权和由第二矩阵中的预定的第二加权值的相应集合来定义。
    • 6. 发明申请
    • MARGIN TEST METHODS AND CIRCUITS
    • 测量方法和电路
    • WO2004105334A3
    • 2005-06-02
    • PCT/US2004015895
    • 2004-05-20
    • RAMBUS INCGARLEPP BRUNO WCHEN FRED FHO ANDREWSTOJANOVIC VLADIMIR
    • GARLEPP BRUNO WCHEN FRED FHO ANDREWSTOJANOVIC VLADIMIR
    • H04L1/20H04L1/24H04L25/03
    • H04L25/03006H04L1/20H04L1/241H04L1/242
    • Described are methods and circuits for margin testing digital receivers. Some embodiments prevent margins from collapsing in response to erroneously received data, and can thus be used in receivers that employ historical data to reduce intersymbol interference (ISI). Some embodiments detect receive errors for input data streams of unknown patterns, and can thus be used for in-system margin testing. Such systems can be adapted to dynamically alter system parameters during device operation to maintain adequate margins despite fluctuations in the system noise environment due to e.g. temperature and supply-voltage changes. Also described are methods of plotting and interpreting filtered and unfiltered error data generated by the disclosed methods and circuits. Some embodiments filter error data to facilitate pattern-specific margin testing, while other embodiments rely upon the statistics of sampled data to explore the margin characteristics of received data.
    • 描述了数字接收机边缘测试的方法和电路。 一些实施例可以防止误差响应于错误接收的数据而崩溃,并且因此可用于采用历史数据的接收机中以减少符号间干扰(ISI)。 一些实施例检测未知模式的输入数据流的接收错误,因此可以用于系统内边缘测试。 这样的系统可以适于在设备操作期间动态地改变系统参数,以保持足够的余量,尽管由于例如系统噪声环境的波动。 温度和电源电压变化。 还描述了绘制和解释由所公开的方法和电路产生的滤波和未滤波的误差数据的方法。 一些实施例对误差数据进行滤波以便于特定于图案的边缘测试,而其他实施例依赖于采样数据的统计来探索接收数据的边缘特性。
    • 7. 发明申请
    • MARGIN TEST METHODS AND CIRCUITS
    • 测量方法和电路
    • WO2004105334A2
    • 2004-12-02
    • PCT/US2004/015895
    • 2004-05-20
    • RAMBUS INC.GARLEPP, Bruno, W.CHEN, Fred, F.HO, AndrewSTOJANOVIC, Vladimir
    • GARLEPP, Bruno, W.CHEN, Fred, F.HO, AndrewSTOJANOVIC, Vladimir
    • H04L25/00
    • H04L25/03006H04L1/20H04L1/241H04L1/242
    • Described are methods and circuits for margin testing digital receivers. Some embodiments prevent margins from collapsing in response to erroneously received data, and can thus be used in receivers that employ historical data to reduce intersymbol interference (ISI). Some embodiments detect receive errors for input data streams of unknown patterns, and can thus be used for in-system margin testing. Such systems can be adapted to dynamically alter system parameters during device operation to maintain adequate margins despite fluctuations in the system noise environment due to e.g. temperature and supply-voltage changes. Also described are methods of plotting and interpreting filtered and unfiltered error data generated by the disclosed methods and circuits. Some embodiments filter error data to facilitate pattern-specific margin testing, while other embodiments rely upon the statistics of sampled data to explore the margin characteristics of received data.
    • 描述了数字接收机边缘测试的方法和电路。 一些实施例可以防止误差响应于错误接收的数据而崩溃,并且因此可用于采用历史数据的接收机中以减少符号间干扰(ISI)。 一些实施例检测未知模式的输入数据流的接收错误,因此可以用于系统内边缘测试。 这样的系统可以适于在设备操作期间动态地改变系统参数,以保持足够的余量,尽管由于例如系统噪声环境的波动。 温度和电源电压变化。 还描述了绘制和解释由所公开的方法和电路产生的滤波和未滤波的误差数据的方法。 一些实施例对误差数据进行滤波以便于特定于图案的边缘测试,而其他实施例依赖于采样数据的统计来探索接收到的数据的边缘特性。