公开(公告)号：US08422591B2

公开(公告)日：2013-04-16

申请号：US13090379

申请日：2011-04-20

Applicant: Oscar E. Agazzi ,  Gottfried Ungerboeck ,  Keshab K. Parhi ,  Christian A. Lutkemeyer ,  Pieter Vorenkamp ,  Kevin T. Chan ,  Myles H. Wakayama

Inventor： Oscar E. Agazzi ,  Gottfried Ungerboeck ,  Keshab K. Parhi ,  Christian A. Lutkemeyer ,  Pieter Vorenkamp ,  Kevin T. Chan ,  Myles H. Wakayama

IPC: H04L27/00

CPC classification number: H04L25/4975 ,  H03M1/0604 ,  H03M1/1215 ,  H04L25/03133 ,  H04L25/03146 ,  H04L25/03343 ,  H04L25/497 ,  H04L2025/03503

Abstract: Various systems and methods related to equalization precoding in a communications channel are disclosed. In one implementation precoding is performed on signals transmitted over an optical channel. In one implementation precoding and decoding operations are performed in parallel to facilitate high speed processing in relatively low cost circuits. Initialization of the precoders may be realized by transmitting information related to the characteristics of the channel between transceiver pairs.

Abstract translation: 公开了与通信信道中的均衡预编码相关的各种系统和方法。 在一个实现中，对通过光信道发射的信号执行预编码。 在一个实现中，并行执行预编码和解码操作以便于在相对低成本的电路中进行高速处理。 可以通过发送与收发器对之间的信道的特性相关的信息来实现预编码器的初始化。

公开(公告)号：US20110013725A1

公开(公告)日：2011-01-20

申请号：US12858224

申请日：2010-08-17

Applicant: Kevin T. Chan

Inventor： Kevin T. Chan

IPC: H04L25/03

CPC classification number: H04B3/23 ,  H04B3/32 ,  H04L25/0272 ,  H04L25/085

Abstract: A power efficient and reduced electromagnetic interference (EMI) emissions multi-transmitter system for unshielded twisted pair (UTP) data communication applications. For each transmitter, digital transmit data is converted to a current-mode differential signal analog waveform by a digital-to-analog converter (DAC). The output current from each DAC is used to generate the required transmit voltage on the respective UTP line. Timing circuitry staggers the time base of each transmitter to reduce the aggregate EMI emissions of the multi-transmitter system.

Abstract translation: 用于非屏蔽双绞线（UTP）数据通信应用的功率高效和降低的电磁干扰（EMI）发射多发射机系统。 对于每个发射器，数字发射数据由数模转换器（DAC）转换为电流模式差分信号模拟波形。 来自每个DAC的输出电流用于在相应的UTP线路上产生所需的发射电压。 定时电路交错了每个发射机的时基，以减少多发射机系统的总EMI辐射。

公开(公告)号：US07835292B2

公开(公告)日：2010-11-16

申请号：US10612025

申请日：2003-07-02

Applicant: Kevin T. Chan

Inventor： Kevin T. Chan

IPC: H04L12/28

CPC classification number: H04L1/22

Abstract: Aspects of the invention include determining or choosing any usable media pair from all existing media pairs of a first device. Any channel may be selected from all existing channels and the selected channel is chosen so that it is different from a general channel assignment corresponding to the determined usable media pair. The selected channel may be assigned to the media pair. A second device may be notified of the assigned channel which corresponds to the media pair chosen from all the media pairs. The second device may cross-connect a corresponding equivalent channel and media pair. The first and second device may be adapted to negotiate the assignment of the selected channel to any one of the media pairs. Alternatively, a particular channel and media pair assignment may be selected from a plurality of predetermined channel and media pair assignments and utilized by the first and second device.

Abstract translation: 本发明的方面包括确定或选择来自第一设备的所有现有媒体对的任何可用媒体对。 可以从所有现有信道中选择任何信道，并且选择所选择的信道，使得其与对应于所确定的可用媒体对的通用信道分配不同。 可以将所选择的频道分配给媒体对。 可以向第二设备通知与从所有媒体对中选择的媒体对相对应的分配的频道。 第二设备可以交叉连接相应的等效信道和媒体对。 第一和第二设备可以适于协调所选择的频道的分配到媒体对中的任何一个。 或者，可以从多个预定信道和媒体对分配中选择特定信道和媒体对分配，并由第一和第二设备使用。

公开(公告)号：US07769102B2

公开(公告)日：2010-08-03

申请号：US11999315

申请日：2007-12-04

Applicant: Kevin T. Chan

Inventor： Kevin T. Chan

IPC: H04L27/00 ,  H04L25/00

CPC classification number: H04L25/08 ,  H04B3/23 ,  H04B3/32 ,  H04L12/10 ,  H04L25/0276 ,  H04L25/0282 ,  H04L25/0286 ,  H04L25/03834 ,  H04L25/14

Abstract: A power efficient and reduced electromagnetic interference (EMI) emissions transmitter for unshielded twisted pair (UTP) data communication applications. Transmit data is processed by a digital filter. The digital filter output data is converted to a current-mode analog waveform by a digital-to-analog converter (DAC). The digital filter is integrated with the DAC binary decoder in a memory device such as a ROM with time multiplexed output. DAC line driver cells are adaptively configurable to operate in either a class-A or a class-B mode depending on the desired operational modality. A discrete-time analog filter is integrated with the DAC line driver to provide additional EMI emissions suppression. An adaptive electronic transmission signal cancellation circuit separates transmit data from receive data in a bidirectional communication system operating in full duplex mode. For a multi-transmitter system, timing circuitry staggers the time base of each transmitter to reduce the aggregate EMI emissions of the multi-transmitter system.

Abstract translation: 用于非屏蔽双绞线（UTP）数据通信应用的功率高效和降低的电磁干扰（EMI）发射器。 发送数据由数字滤波器处理。 数字滤波器输出数据通过数/模转换器（DAC）转换为电流模式模拟波形。 数字滤波器与DAC二进制解码器集成在诸如具有时间复用输出的ROM的存储器件中。 DAC线路驱动器单元可以自适应地配置，以根据所需的操作模式在A类或B类模式下工作。 离散时间模拟滤波器与DAC线路驱动器集成，以提供额外的EMI发射抑制。 自适应电子传输信号消除电路在全双工模式下工作的双向通信系统中分离发送数据与接收数据。 对于多发射机系统，定时电路交错了每个发射机的时基，以减少多发射机系统的总EMI辐射。

公开(公告)号：US07589655B2

公开(公告)日：2009-09-15

申请号：US12204482

申请日：2008-09-04

Applicant: Yee Ling Cheung ,  Kevin T. Chan ,  Jan Mulder

Inventor： Yee Ling Cheung ,  Kevin T. Chan ,  Jan Mulder

IPC: H03M1/66

CPC classification number: H03F3/45183 ,  H03F2203/45466

Abstract: Provided is a method and system for controlling current characteristics in a transceiver having a transmitter. The method includes identifying a phase control signal from an adjacent current cell preceding the particular current cell in time and logically ORing the phase control signal from the preceding cell with a phase control signal from the particular current cell.

Abstract translation: 提供了一种用于控制具有发射机的收发机中的电流特性的方法和系统。 该方法包括在时间上识别来自特定当前小区之前的相邻当前小区的相位控制信号，并且将来自前一小区的相位控制信号与来自特定当前小区的相位控制信号进行逻辑或运算。

公开(公告)号：US20080129332A1

公开(公告)日：2008-06-05

申请号：US11980541

申请日：2007-10-31

Applicant: Kevin T. Chan

Inventor： Kevin T. Chan

IPC: H03K19/003

CPC classification number: H04L25/0298

Abstract: A communication system includes an integrated circuit (IC) die having an on-chip source termination. The on-chip source termination can be a non-precision resistor, such as an unsilicided poly resistor, or any other suitable termination. As compared to an off-chip source termination, the on-chip source termination can reduce voltage peaking and/or voltage overshoot in the IC die and/or at a load that is connected to the IC die. The IC die can further include a line driver to provide a source current. A bias generator can be included to provide a bias current to the line driver. The bias generator can include a first current source coupled to an off-chip resistor and a second current source coupled to an on-chip resistor. An output voltage of the IC die can be adjusted by manipulating a trim control of the off-chip resistor and/or a trim control of the on-chip resistor.

Abstract translation: 通信系统包括具有片上源极端接的集成电路（IC）管芯。 片上源极端接可以是非精密电阻器，例如非硅化聚电阻器，或任何其它合适的端接。 与片外源极端接相比，片上源极端接可以降低IC芯片中的电压峰化和/或电压过冲和/或连接到IC芯片的负载。 IC芯片还可以包括线驱动器以提供源极电流。 可以包括偏置发生器以向线路驱动器提供偏置电流。 偏置发生器可以包括耦合到片外电阻器的第一电流源和耦合到片上电阻器的第二电流源。 IC芯片的输出电压可以通过操作片外电阻器的微调控制和/或片上电阻器的微调控制来调节。

公开(公告)号：US06954490B2

公开(公告)日：2005-10-11

申请号：US10162974

申请日：2002-06-05

Applicant: Kevin T. Chan

Inventor： Kevin T. Chan

IPC: H04B1/38 ,  H04B3/00 ,  H04B3/23 ,  H04B15/00 ,  H04J11/00 ,  H04L5/16 ,  H04L12/10 ,  H04L25/00 ,  H04L25/02 ,  H04L25/03 ,  H04L25/08 ,  H04L25/14 ,  H04L25/49 ,  H04L27/00 ,  H04L27/04

CPC classification number: H04L25/08 ,  H04B3/23 ,  H04B3/32 ,  H04L12/10 ,  H04L25/0276 ,  H04L25/0282 ,  H04L25/0286 ,  H04L25/03834 ,  H04L25/14

Abstract: A power efficient and reduced electromagnetic interference (EMI) emissions transmitter for unshielded twisted pair (UTP) data communication applications. Transmit data is interpolated by N and processed by a digital filter to obtain the pulse shape required by the particular communication application. The digital filter output data is converted to a current-mode analog waveform by a digital-to-analog converter (DAC). The digital filter is integrated with the DAC binary decoder in a memory device such as a ROM with time multiplexed output. When implemented in such manner, the logical implementation and memory replaces digital filtering circuits, DAC decoding logic circuit and re-synchronization logic circuits that are conventionally implemented in hardware. Thus, the hardware functionality of these circuits is rendered into arithmetic form and implemented in a memory device.

Abstract translation: 用于非屏蔽双绞线（UTP）数据通信应用的功率高效和降低的电磁干扰（EMI）发射器。 发送数据由N内插并由数字滤波器处理以获得特定通信应用所需的脉冲形状。 数字滤波器输出数据通过数/模转换器（DAC）转换为电流模式模拟波形。 数字滤波器与DAC二进制解码器集成在诸如具有时间复用输出的ROM的存储器件中。 当以这种方式实现时，逻辑实现和存储器替代了常规地以硬件实现的数字滤波电路，DAC解码逻辑电路和重新同步逻辑电路。 因此，这些电路的硬件功能被呈现为算术形式并在存储器件中实现。

公开(公告)号：US06804304B1

公开(公告)日：2004-10-12

申请号：US09429988

申请日：1999-10-29

Applicant: Kevin T. Chan

Inventor： Kevin T. Chan

IPC: H04B300

CPC classification number: H04B3/23 ,  H04L12/10

Abstract: A power efficient and reduced electromagnetic interference (EMI) emissions multi-transmitter system for unshielded twisted pair (UTP) data communication applications. For each transmitter, digital transmit data is converted to a current-mode differential signal analog waveform by a digital-to-analog converter (DAC). The output current from each DAC is used to generate the required transmit voltage on the respective UTP line. Timing circuitry staggers the time base of each transmitter to reduce the aggregate EMI emissions of the multi-transmitter system.

Abstract translation: 用于非屏蔽双绞线（UTP）数据通信应用的功率高效和降低的电磁干扰（EMI）发射多发射机系统。 对于每个发射器，数字发射数据由数模转换器（DAC）转换为电流模式差分信号模拟波形。 来自每个DAC的输出电流用于在相应的UTP线路上产生所需的发射电压。 定时电路交错了每个发射机的时基，以减少多发射机系统的总EMI辐射。

公开(公告)号：US06744831B2

公开(公告)日：2004-06-01

申请号：US10087239

申请日：2002-03-01

Applicant: Kevin T. Chan

Inventor： Kevin T. Chan

IPC: H04B110

CPC classification number: H04B3/32 ,  H04B1/586 ,  H04B3/23 ,  H04L12/10

Abstract: An adaptive electronic transmission signal cancellation circuit for separating transmit data from receive data in a bidirectional communication system operating in full duplex mode is disclosed. The output of a main transmitter responsive to a first bias current is connected to the output of a receiver through an internal resistor. A first replica transmitter responsive to a second bias current and matched to the main transmitter current gain and rise/fall time characteristics is connected to the input terminal of the receiver, and produces a cancellation voltage between the output terminal of the main transmitter and the input terminal of the receiver as a function of the second bias current and the internal resistor. A second replica transmitter matched to the current gain and rise/fall time characteristics of the main transmitter and the first replica transmitter and responsive to the second bias current is connected to the output terminal of the main transmitter for canceling excess current, developed by the first replica transmitter, at the output terminal of the main transmitter.

Abstract translation: 公开了一种用于在全双工模式下工作的双向通信系统中从发送数据与接收数据分离的自适应电子传输信号消除电路。 响应于第一偏置电流的主发射机的输出通过内部电阻器连接到接收器的输出端。 响应于第二偏置电流并与主发射机电流增益和上升/下降时间特性匹配的第一复制发射机连接到接收机的输入端，并且在主发射机的输出端和输入端之间产生抵消电压 接收器的端子作为第二偏置电流和内部电阻器的函数。 与主发射机和第一复制发射机的当前增益和上升/下降时间特性匹配的第二复制发射机并响应于第二偏置电流连接到主发射机的输出端，用于消除由第一 复制发射机，在主发射机的输出端。

公开(公告)号：US06594304B2

公开(公告)日：2003-07-15

申请号：US10124967

申请日：2002-04-18

Applicant: Kevin T. Chan

Inventor： Kevin T. Chan

IPC: H04B138

CPC classification number: H04L25/08 ,  H04B3/23 ,  H04B3/32 ,  H04L12/10 ,  H04L25/0276 ,  H04L25/0282 ,  H04L25/0286 ,  H04L25/03834 ,  H04L25/14

Abstract: A power efficient and reduced electromagnetic interference (EMI) emissions transmitter for unshielded twisted pair (UTP) data communication applications. Transmit data is processed by a digital filter. The digital filter output data is converted to a current-mode analog waveform by a digital-to-analog converter (DAC). The digital filter is integrated with the DAC binary decoder in a memory device such as a ROM with time multiplexed output. DAC line driver cells are adaptively configurable to operate in either a class-A or a class-B mode depending on the desired operational modality. A discrete-time analog filter is integrated with the DAC line driver to provide additional EMI emissions suppression. An adaptive electronic transmission signal cancellation circuit separates transmit data from receive data in a bidirectional communication system operating in full duplex mode. For a multi-transmitter system, timing circuitry staggers the time base of each transmitter to reduce the aggregate EMI emissions of the multi-transmitter system.

Abstract translation: 用于非屏蔽双绞线（UTP）数据通信应用的功率高效和降低的电磁干扰（EMI）发射器。 发送数据由数字滤波器处理。 数字滤波器输出数据通过数/模转换器（DAC）转换为电流模式模拟波形。 数字滤波器与DAC二进制解码器集成在具有时间复用输出的ROM等存储器件中。 DAC线路驱动器单元可以自适应地配置，以根据所需的操作模式在A类或B类模式下工作。 离散时间模拟滤波器与DAC线路驱动器集成，以提供额外的EMI发射抑制。 自适应电子传输信号消除电路在全双工模式下工作的双向通信系统中分离发送数据与接收数据。 对于多发射机系统，定时电路交错了每个发射机的时基，以减少多发射机系统的总EMI辐射。