公开(公告)号：US20040163120A1

公开(公告)日：2004-08-19

申请号：US10780362

申请日：2004-02-17

Applicant: Broadcom Corporation

Inventor： Theodore F. Rabenko ,  James C. H. Thi ,  John D. Horton JR. ,  Thomas J. Quigley ,  Lisa V. Denney ,  Jonathan S. Min ,  Christopher R. Jones ,  Henry Samueli ,  Fang Lu ,  Feng Chen ,  Sean F. Nazareth

IPC: H04N007/173 ,  H04L012/50 ,  H04Q011/00 ,  H04L012/66 ,  G01R031/08 ,  G08C015/00 ,  H04L012/26 ,  G06F011/00 ,  H04J003/14 ,  H04J001/16 ,  H04L001/00

CPC classification number: H04L12/2801 ,  H04J3/0655 ,  H04L1/0003

Abstract: A method for communicating information is disclosed wherein a time slot is allocated in a time division multiple access system for a transmission from a subscriber to a headend. Synchronization of a clock of the subscriber with respect to a clock of the headend is enhanced using a message transmitted from the headend to the subscriber which is indicative of an error in a subscriber transmission time with respect to the time slot. A feedback loop process is used to determine at least one of fractional symbol timing correction and carrier phase correction of a transmission from the subscriber to the headend. Filter coefficients are generated at the headend from a ranging signal transmitted from the subscriber to the headend and transmitting the filter coefficients from the headend to the subscriber, the filter coefficients being used by the subscriber to compensate for noise in a transmission from the subscriber to the headend.

公开(公告)号：US20040165690A1

公开(公告)日：2004-08-26

申请号：US10789546

申请日：2004-02-27

Applicant: Broadcom Corporation

Inventor： Tarek Kaylani ,  Fang Lu ,  Henry Samueli

IPC: H04K001/00 ,  H04L025/00

CPC classification number: G06F5/14 ,  G06F1/025 ,  G06F5/12 ,  G06F2205/061 ,  G06F2205/126 ,  H03L7/07 ,  H03L7/081 ,  H03L7/085 ,  H03L7/0996 ,  H03L7/23 ,  H04J3/062

Abstract: To synchronize a regularly occurring pulse train to the average of a bunched pulse train, an oscillator generates a plurality of differently phase shifted signals at a given frequency. One of the phase shifted signals is selected as an output signal. The output signal is compared with the bunched pulse train. The selected phase shifted signal is changed responsive to the comparison so the output signal occurs at the average frequency of the bunched pulse train. The oscillator is formed as a plurality of differential amplifier stages having equal controllable delays. The stages are connected together to form a ring oscillator. The output signal is compared with the bunched pulse train through a FIFO. A signal representative of the state of the FIFO is used as an error signal to control the selection of the phase shifted signal to be used as the output signal. A phase locked loop that synchronizes the phase shifted signal generating oscillator to a frequency reference is nested in the control loop that selects one of the phase shifted signals as the output signal.

Abstract translation: 为了使定期发生的脉冲串与聚束脉冲串的平均值同步，振荡器以给定频率产生多个不同的相移信号。 选择一个相移信号作为输出信号。 将输出信号与聚束脉冲串进行比较。 所选择的相移信号响应于比较而改变，因此输出信号以聚束脉冲串的平均频率发生。 振荡器形成为具有相同可控延迟的多个差分放大器级。 这些级连接在一起以形成环形振荡器。 输出信号通过FIFO与聚束脉冲序列进行比较。 代表FIFO状态的信号被用作误差信号，以控制用作输出信号的相移信号的选择。 将相移信号产生振荡器与频率基准同步的锁相环嵌套在选择相移信号之一作为输出信号的控制回路中。

公开(公告)号：US20030026283A1

公开(公告)日：2003-02-06

申请号：US09916576

申请日：2001-07-30

Applicant: Broadcom Corporation

Inventor： Bruce J. Currivan ,  Jonathan S. Min ,  Fang Lu

IPC: H04B007/216

CPC classification number: H04L12/44 ,  H04L12/2801

Abstract: A system for detecting collisions in a shared communications medium, such as a TDMA medium, includes a receive path adapted to generate a first intermediate signal, a second intermediate signal, and a data symbol sequence from an input signal. A preamble detection module generates a correlation metric from the first intermediate signal. A power measurement module generates a power indication signal from the second intermediate signal. A noise measurement module generates a noise indication signal from the second intermediate signal and the data symbol sequence. A processing module is adapted to characterize the input signal as a collision for certain values of correlation metric, power indication signal, and noise indication signal.

Abstract translation: 用于检测诸如TDMA介质的共享通信介质中的冲突的系统包括适于从输入信号生成第一中间信号，第二中间信号和数据符号序列的接收路径。 前导码检测模块从第一中间信号生成相关度量。 功率测量模块从第二中间信号产生功率指示信号。 噪声测量模块从第二中间信号和数据符号序列产生噪声指示信号。 处理模块适于将输入信号表征为相关度量，功率指示信号和噪声指示信号的某些值的冲突。

公开(公告)号：US20020191684A1

公开(公告)日：2002-12-19

申请号：US10164367

申请日：2002-06-10

Applicant: Broadcom Corporation

Inventor： Jonathan S. Min ,  Fang Lu

IPC: H04B001/38

CPC classification number: H04L25/03343 ,  H04J3/0682 ,  H04L5/023 ,  H04L27/34 ,  H04L2027/002 ,  H04W52/54

Abstract: The present invention provides a system and method for performing ranging operations in a cable modem system. In accordance with embodiments of the present invention, transmission times, transmission power levels, transmission carrier frequencies, and pre-equalization parameters are adjusted to provide for robust operation of the cable modem system. More particularly, iterative processing steps are used to provide coefficient ordering, scaling, and aligning between the multiple cable modems and the cable modem termination system present in a cable modem system.

Abstract translation: 本发明提供一种用于在电缆调制解调器系统中执行测距操作的系统和方法。 根据本发明的实施例，调整传输时间，传输功率电平，传输载波频率和预均衡参数以提供电缆调制解调器系统的鲁棒操作。 更具体地，使用迭代处理步骤来提供多个电缆调制解调器和存在于电缆调制解调器系统中的电缆调制解调器终端系统之间的系数排序，缩放和对准。

公开(公告)号：US20020180001A1

公开(公告)日：2002-12-05

申请号：US10198408

申请日：2002-07-19

Applicant: Broadcom Corporation

Inventor： Agnes N. Woo ,  Kenneth R. Kindsfater ,  Fang Lu

IPC: H01L029/00

CPC classification number: H01L23/50 ,  H01F17/0006 ,  H01F17/0013 ,  H01F2017/0053 ,  H01F2021/125 ,  H01L23/5227 ,  H01L23/60 ,  H01L27/0248 ,  H01L27/0251 ,  H01L27/08 ,  H01L2924/0002 ,  H01L2924/3011 ,  H03B5/1212 ,  H03B5/1228 ,  H03B5/1243 ,  H03B5/364 ,  H03D7/161 ,  H03D7/18 ,  H03G1/0029 ,  H03H11/1291 ,  H03J1/0075 ,  H03J3/04 ,  H03J3/08 ,  H03J3/185 ,  H03J2200/10 ,  H03L7/10 ,  H03L7/23 ,  H04B1/28 ,  H01L2924/00

Abstract: An integrated receiver with channel selection and image rejection substantially implemented on a single CMOS integrated circuit is described. A receiver front end provides programable attenuation and a programable gain low noise amplifier. Frequency conversion circuitry advantageously uses LC filters integrated onto the substrate in conjunction with image reject mixers to provide sufficient image frequency rejection. Filter tuning and inductor Q compensation over temperature are performed on chip. The filters utilize multi track spiral inductors. The filters are tuned using local oscillators to tune a substitute filter, and frequency scaling during filter component values to those of the filter being tuned. In conjunction with filtering, frequency planning provides additional image rejection. The advantageous choice of local oscillator signal generation methods on chip is by PLL out of band local oscillation and by direct synthesis for in band local oscillator. The VCOs in the PLLs are centered using a control circuit to center the tuning capacitance range. A differential crystal oscillator is advantageously used as a frequency reference. Differential signal transmission is advantageously used throughout the receiver. ESD protection is provided by a pad ring and ESD clamping structure that maintains signal integrity. Also provided are shunts at each pin to discharge ESD build up. The shunts utilize a gate boosting structure to provide sufficient small signal RF performance, and minimal parasitic loading.

Abstract translation: 描述了基本上在单个CMOS集成电路上实现的具有信道选择和图像抑制的集成接收机。 接收机前端提供可编程衰减和可编程增益低噪声放大器。 频率转换电路有利地使用集成到衬底上的LC滤波器与图像抑制混合器结合，以提供足够的图像频率抑制。 过滤器调谐和电感Q补偿温度在芯片上执行。 滤波器采用多轨螺旋电感。 使用本地振荡器调整滤波器以调整替代滤波器，以及滤波器组件值期间的频率缩放与被调谐的滤波器的频率缩放。 结合滤波，频率规划提供了额外的镜像抑制。 片上本地振荡器信号产生方法的有利选择是通过PLL带外本地振荡和通过频带本地振荡器的直接合成。 PLL中的VCO使用控制电路居中，使调谐电容范围居中。 差分晶体振荡器有利地用作频率参考。 差分信号传输有利地用于整个接收机。 ESD保护由保护信号完整性的焊盘环和ESD钳位结构提供。 还提供每个引脚上的分流器，以放电ESD积聚。 分流器利用栅极升压结构来提供足够的小信号RF性能和最小的寄生负载。

公开(公告)号：US20010055319A1

公开(公告)日：2001-12-27

申请号：US09780179

申请日：2001-02-09

Applicant: Broadcom Corporation

Inventor： Thomas J. Quigley ,  Jonathan S. Min ,  Lisa V. Denney ,  Henry Samueli ,  Sean F. Nazareth ,  Feng Chen ,  Fang Lu ,  Christopher R. Jones

IPC: H04N007/173 ,  H04J001/00

CPC classification number: H04L25/03343 ,  H04B1/1036 ,  H04J3/0664 ,  H04J3/0682 ,  H04J3/1694 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0061 ,  H04L1/203 ,  H04L7/0004 ,  H04L7/0029 ,  H04L7/033 ,  H04L12/2801 ,  H04L49/90 ,  H04L49/9094 ,  H04L2025/03808 ,  Y02D50/10

Abstract: A number of features for enhancing the performance of a cable transmission system in which data is transmitted between a cable modem termination system at a headend and a plurality of cable modems located different distances from the headend. The power transmission level, slot timing, and equalization of the cable modems are set by a ranging process. Data is transmitted by the modems in fragmented form. Various measures are taken to make transmission from the cable modems robust. The upstream data transmission is controlled to permit multiple access from the cable modems.

Abstract translation: 用于增强电缆传输系统的性能的许多特征，其中数据在前端的电缆调制解调器终端系统与位于与头端不同距离的多个电缆调制解调器之间传输。 电缆调制解调器的功率传输电平，时隙定时和均衡由测距过程设置。 调制解调器以分段形式传输数据。 采取各种措施使电缆调制解调器的传输稳健。 控制上游数据传输以允许来自电缆调制解调器的多次访问。