公开(公告)号：US06332004B1

公开(公告)日：2001-12-18

申请号：US09429892

申请日：1999-10-29

Applicant: Kevin T. Chan

Inventor： Kevin T. Chan

IPC: H04B300

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 converted to a current-mode analog waveform by a digital-to-analog converter (DAC). A discrete-time analog filter is integrated with the DAC line driver to provide additional EMI emissions suppression. A multiplicity of output cells produce an output signal that is responsive to a plurality of digitized input data samples. A timing circuit generates timing signals for dividing each digitized input data sample into a first time segment and a second time segment. A control logic connected to each output cell generates control signals to drive each output cell to produce a portion of the output signal for the first time segment and the full output signal for the second time segment.

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/模转换器（DAC）转换为电流模式模拟波形。 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。 多个输出单元产生响应多个数字化输入数据样本的输出信号。 定时电路产生用于将每个数字化的输入数据样本分成第一时间段和第二时间段的定时信号。 连接到每个输出单元的控制逻辑产生控制信号以驱动每个输出单元以产生第一时间段的输出信号的一部分和第二时间段的全输出信号。

公开(公告)号：US08346192B2

公开(公告)日：2013-01-01

申请号：US13437570

申请日：2012-04-02

Applicant: Kevin T. Chan

Inventor： Kevin T. Chan

IPC: H04B1/04 ,  H04W52/02

CPC classification number: H04B1/02 ,  H04W52/52

Abstract: A transmitter includes a detection element to determine when a current power requirement of a communication link is less than the standard transmit power. The current power requirement may be determined by a current operation condition of the communication link, for instance. The transmit power of the transmitter may be set to be less than the standard power in any of a variety of ways. For example, a center tap voltage of the transmitter may be reduced. In another example, a class of operation of the transmitter may be changed. In yet another example, the transmitter may include a current mirror having a plurality of diode-connected transistors coupled in parallel, thereby reducing the current at output terminals of the transmitter. Reducing the current at the output terminals decreases the output power of the transmitter, which may reduce the power consumed by the transmitter.

Abstract translation: 发射机包括检测元件，用于确定通信链路的当前功率需求何时小于标准发射功率。 例如，当前功率需求可以由通信链路的当前操作条件来确定。 发射机的发射功率可以以各种方式中的任何一种设置为小于标准功率。 例如，可以减小发射机的中心抽头电压。 在另一示例中，可以改变发射机的一类操作。 在又一示例中，发射机可以包括具有并联耦合的多个二极管连接的晶体管的电流镜，从而降低发射器的输出端处的电流。 降低输出端子处的电流会降低发射机的输出功率，从而降低发射机的功耗。

公开(公告)号：US08254506B2

公开(公告)日：2012-08-28

申请号：US12796329

申请日：2010-06-08

Applicant: Kevin T. Chan

Inventor： Kevin T. Chan

IPC: H03D1/04

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：US07864689B2

公开(公告)日：2011-01-04

申请号：US10612729

申请日：2003-07-02

Applicant: Kevin T. Chan

Inventor： Kevin T. Chan

IPC: H04L12/28

CPC classification number: H04L69/18 ,  H04L69/14 ,  H04L69/324 ,  H04L69/40

Abstract: Providing and configuring communication links may include determining a usable media pair from all existing media pairs and selecting any one channel from all existing channels. The selected channel may be assigned to any one of the media pairs. Any one or any combination of media pairs may be monitored in order to detect the existence of a communication signal on any of the media pairs. Some or all of the existing media pairs may be monitored to determine which of the media pair may be capable of facilitating communication at a maximum communication speed and if not, at a reduced speed. Any selected channel may be cross-connected to any one of the existing media pairs, which may be capable of facilitating communication at the maximum or reduced communication speed.

Abstract translation: 提供和配置通信链路可以包括确定来自所有现有媒体对的可用媒体对，并且从所有现有信道中选择任何一个信道。 可以将所选择的频道分配给任何一个媒体对。 可以监视媒体对的任何一种或任何组合，以便检测任何媒体对上的通信信号的存在。 可以监视部分或全部现有媒体对，以确定媒体对中的哪一个可能能够以最大通信速度促进通信，如果不是，则以降低的速度。 任何所选择的信道可以交叉连接到现有媒体对中的任何一个，其可以有助于以最大或降低的通信速度进行通信。

公开(公告)号：US07778333B2

公开(公告)日：2010-08-17

申请号：US11676768

申请日：2007-02-20

Applicant: Kevin T. Chan

Inventor： Kevin T. Chan

IPC: H04L25/00 ,  H04B3/00

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：US07599447B2

公开(公告)日：2009-10-06

申请号：US11948502

申请日：2007-11-30

Applicant: Kevin T. Chan

Inventor： Kevin T. Chan

IPC: H04L27/00

CPC classification number: H04B15/00 ,  H04B15/02 ,  H04B2215/067 ,  H04L25/0276 ,  H04L25/0286 ,  H04L25/08

Abstract: In a transmitter that includes a plurality of partitioned DAC processing cells coupled to a corresponding plurality of partitioned encoder processing cells, a method for processing signals may include aggregating outputs of each of the plurality of partitioned DAC processing cells to generate an analog output signal. The transmitter may be a direct drive transmitter. The generated analog output signal may be a reduced emissions analog signal. The plurality of encoder processing cells may be partitioned into at least a group of odd encoder processing cells and a group of even encoder processing cells. The plurality of DAC processing cells may be partitioned into at least a group of odd DAC processing cells for processing outputs of the group of odd encoder processing cells and a group of even DAC processing cells for processing outputs of the group of even encoder processing cells.

Abstract translation: 在包括耦合到对应的多个分割编码器处理单元的多个分割DAC处理单元的发射机中，处理信号的方法可以包括聚合多个分割的DAC处理单元中的每一个的输出以产生模拟输出信号。 发射机可以是直接驱动发射机。 所产生的模拟输出信号可以是减少的发射模拟信号。 多个编码器处理单元可以被划分为至少一组奇数编码器处理单元和一组偶数编码器处理单元。 多个DAC处理单元可以划分为至少一组奇数DAC处理单元，用于处理奇数编码器处理单元组的输出和用于处理偶数编码器处理单元组的输出的一组偶数DAC处理单元。

公开(公告)号：US07587181B2

公开(公告)日：2009-09-08

申请号：US10986020

申请日：2004-11-12

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

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

IPC: H04B1/04

CPC classification number: H04B1/581

Abstract: Provided is a method and system for controlling current characteristics in a transceiver having a transmitter. The transmitter includes a plurality of current cells. Each cell is configurable for operating in different modes. The method includes determining a first probability associated with transmitting data at a particular symbolic level and determining a second probability associated with each cell being used during a transmission at the particular symbolic level. Next, one of the modes for each cell is selected in accordance with anticipated performance requirements. An average current of the transmitter is then calculated based upon the determined first and second probabilities and the selected modes.

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。 发射机包括多个当前小区。 每个单元都可配置为以不同的模式运行。 该方法包括确定与在特定符号级别发送数据相关联的第一概率，并且确定与在特定符号级别的传输期间正在使用的每个小区相关联的第二概率。 接下来，根据预期的性能要求选择每个单元的模式之一。 然后基于所确定的第一和第二概率和所选择的模式来计算发射机的平均电流。

公开(公告)号：US07423569B2

公开(公告)日：2008-09-09

申请号：US11409277

申请日：2006-04-24

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：US06931073B2

公开(公告)日：2005-08-16

申请号：US10095233

申请日：2002-03-11

Applicant: Kevin T. Chan

Inventor： Kevin T. Chan

IPC: H04B3/23 ,  H04L12/10 ,  H04B3/00

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：US06925130B2

公开(公告)日：2005-08-02

申请号：US10612083

申请日：2003-07-02

Applicant: Kevin T. Chan

Inventor： Kevin T. Chan

IPC: H03M1/66 ,  H04B15/00 ,  H04B15/02 ,  H04L25/02 ,  H04L25/08 ,  H04L27/04 ,  H04L27/12

CPC classification number: H04B15/00 ,  H04B15/02 ,  H04B2215/067 ,  H04L25/0276 ,  H04L25/0286 ,  H04L25/08

Abstract: A reduced emission transmitter may include an encoder block, which may be partitioned into a first group comprising odd encoder processing cells and a second group comprising even encoder processing cells. A DAC block may also be partitioned into a first group comprising odd DAC processing cells and a second group comprising even DAC processing cells. The first group of encoder processing cells may be coupled to the first group of DAC processing cells and the second group of encoder processing cells may be coupled to the second group of DAC processing cells. The first group of encoder processing cells may be clocked using a first clock signal and the second group of encoder processing cells may be clocked using a second clock signal, the second clock signal being a delayed version of the first clock signal.

Abstract translation: 减少发射发射器可以包括编码器块，其可以被划分为包括奇数编码器处理单元的第一组和包括偶数编码器处理单元的第二组。 DAC块也可以被划分成包括奇数DAC处理单元的第一组和包括偶数DAC处理单元的第二组。 第一组编码器处理单元可以耦合到第一组DAC处理单元，并且第二组编码器处理单元可以耦合到第二组DAC处理单元。 可以使用第一时钟信号对第一组编码器处理单元进行计时，并且第二组编码器处理单元可以使用第二时钟信号来计时，第二时钟信号是第一时钟信号的延迟版本。