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    • 67. 发明授权
    • Methodology for designing high speed receivers below a target bit-error-rate
    • 用于设计低于目标误码率的高速接收机的方法
    • US07277828B2
    • 2007-10-02
    • US10777238
    • 2004-02-12
    • Sridhar RamaswamySong WuBhavesh G. Bhakta
    • Sridhar RamaswamySong WuBhavesh G. Bhakta
    • G06F15/00G06F19/00
    • H04L1/24H04L1/203H04L25/0212
    • A method, and associated storage medium containing software and a system, includes extracting a time domain impulse response from parameters that characterize a communication channel, generating a probability distribution function (PDF) of an output voltage based on the impulse response; and computing a relationship between bit error rate and voltage margin based on the final probability distribution function. Generating the PDF of the output voltage may comprise one or more of the following acts: quantizing the impulse response into a plurality of quantized levels, assigning taps to the quantized levels and determining a number of taps assigned to each quantized level, determining allowable voltage levels for each quantized level, and determining a probability of occurrence of each allowable voltage level, determining a PDF for each voltage level; and convolving all of the PDFs for the various voltage levels to obtain the PDF of the output voltage.
    • 包括软件和系统的方法和相关联的存储介质包括从表征通信信道的参数中提取时域脉冲响应,基于脉冲响应产生输出电压的概率分布函数(PDF); 并基于最终概率分布函数计算误码率和电压余量之间的关系。 生成输出电压的PDF可以包括以下动作中的一个或多个:将脉冲响应量化为多个量化电平,为量化电平分配抽头并且确定分配给每个量化电平的抽头数量,确定容许电压电平 并且确定每个可允许电压电平的发生概率,确定每个电压电平的PDF; 并卷积所有PDF的各种电压电平,以获得输出电压的PDF。
    • 69. 发明申请
    • High performance sense amplifiers
    • 高性能感测放大器
    • US20050162193A1
    • 2005-07-28
    • US10765377
    • 2004-01-27
    • Robert PayneBhavesh BhaktaSridhar RamaswamySong Wu
    • Robert PayneBhavesh BhaktaSridhar RamaswamySong Wu
    • H03F3/45H03K3/356
    • H03K3/356139H03K3/356173
    • A sense amplifier and associated method comprise a regenerative latch, an input differential pair of transistors coupled to the regenerative latch, and a leakage device coupled to each of the transistors comprising the input differential pair of transistors. The leakage device is adapted to maintain the input differential pair of transistors in an on state during a pre-charge phase. In other embodiments, the sense amplifier includes a clocked buffer coupled to the outputs of the regenerative latch. The clocked buffer provides additional drive current for the sense amplifier and is clocked by a clock signal that controls the regenerative latch. In yet other embodiments, the sense amplifier includes a secondary hold latch coupled to the outputs of the regenerative latch to maintain an output decision for the sense amplifier while other portions of the sense amplifier pre-charge.
    • 读出放大器和相关联的方法包括再生锁存器,耦合到再生锁存器的输入差分对晶体管,以及耦合到每个晶体管的泄漏装置,该晶体管包括晶体管的输入差分对。 泄漏装置适于在预充电阶段期间将晶体管的输入差分对保持在导通状态。 在其他实施例中,读出放大器包括耦合到再生锁存器的输出的时钟缓冲器。 时钟缓冲器为读出放大器提供额外的驱动电流,并由控制再生锁存器的时钟信号计时。 在其他实施例中,读出放大器包括耦合到再生锁存器的输出端的次级保持锁存器,以便在读出放大器的其它部分预充电时保持读出放大器的输出判定。
    • 70. 发明授权
    • Adaptive frequency domain equalizer circuits, systems, and methods for discrete multitone based digital subscriber line modem
    • 用于离散多音频数字用户线调制解调器的自适应频域均衡器电路,系统和方法
    • US06389062B1
    • 2002-05-14
    • US09069919
    • 1998-04-30
    • Song Wu
    • Song Wu
    • H04B138
    • H04L25/03159H04L2025/03414H04L2025/03522
    • A method of modem communications between first and second modems (10, 20k) over a communications facility (TWP). The method operates the first modem (20k) to issue communications to the second modem (10) over the communications facility. These communications comprise a plurality of subchannel signals (n). The method also operates the second modem to perform various steps. In one of these steps, the second modem converts (33) the communications from time domain communications to frequency domain communications, where the frequency domain communications signals comprise a plurality of subchannel signals. Each of these plurality of subchannel signals comprises an amplitude portion and a phase portion. In another of these steps, the second modem equalizes (36) the amplitude portion of each of the plurality of subchannel signals using fixed gain factors (GE(n))corresponding to each of the plurality of subchannel signals. In still another of these steps, the second modem equalizes (37) the phase portion of each of the plurality of subchannel signals using adjustable phase factors (PE(n)) corresponding to each of the plurality of subchannel signals. The adjustable phase factors are adjusted in response to previous communications from the first modem to the second modem.
    • 在通信设施(TWP)上的第一和第二调制解调器(10,20k)之间的调制解调器通信的方法。 该方法操作第一调制解调器(20k)以通过通信设施发送到第二调制解调器(10)的通信。 这些通信包括多个子信道信号(n)。 该方法还操作第二调制解调器以执行各种步骤。 在这些步骤之一中,第二调制解调器将来自时域通信的通信(33)转换为频域通信,其中频域通信信号包括多个子信道信号。 这些多个子信道信号中的每一个包括振幅部分和相位部分。 在这些步骤的另一步骤中,第二调制解调器使用与多个子信道信号中的每一个相对应的固定增益因子(GE(n))来均衡(36)多个子信道信号中的每一个的振幅部分。 在这些步骤的另一个步骤中,第二调制解调器使用与多个子信道信号中的每一个对应的可调相位因子(PE(n))来均衡(37)多个子信道信号中的每一个的相位部分。 响应于从第一调制解调器到第二调制解调器的先前通信来调整可调相位因子。