公开(公告)号：US06703865B2

公开(公告)日：2004-03-09

申请号：US09983818

申请日：2001-10-26

Applicant: Kevin T. Chan

Inventor： Kevin T. Chan

IPC: H03K190175

CPC classification number: H04L25/0266 ,  Y10T307/305

Abstract: A line driver selectively drives one of two transmission lines. The line driver includes a differential amplifier connected to first and second differential switches. The first differential switch is connected between an output of the differential amplifier and a first of two transmission lines. The second differential switch is connected to the output of the differential amplifier and to the second of two transmission lines. The first and second differential switches are controlled by respective first and second control signals. The output of the differential amplifier is connected to either the first or the second transmission line in response to the first and second control signals. The differential switches include loopback protection to an prevent an incoming signal from passing from one transmission line to another during power down mode.

公开(公告)号：US06538508B2

公开(公告)日：2003-03-25

申请号：US09969793

申请日：2001-10-04

Applicant: Yee Ling Cheung ,  Kevin T. Chan ,  Siavash Fallahi

Inventor： Yee Ling Cheung ,  Kevin T. Chan ,  Siavash Fallahi

IPC: H03F136

CPC classification number: H03G1/0088

Abstract: A programmable gain amplifier (PGA) has an amplifier and a variable resistor that is connected to the output of the amplifier. The variable resistor includes a resistor that is connected to a reference voltage and multiple parallel taps that tap off the resistor. A two-stage switch network having fine stage switches and coarse stage switches connects the resistor taps to an output node of the PGA. The taps and corresponding fine stage switches are arranged into two or more groups, where each group has n-number of fine stage switches and corresponding taps. One terminal of each fine stage switch is connected to the corresponding resistor tap, and the other terminal is connected to an output terminal for the corresponding group. The coarse stage switches select from among the groups of fine stage switches, and connect to the output of the PGA. During operation, one selected tap is connected to the output of the PGA by closing the appropriate fine stage switch and coarse stage switch, where the selected tap defines a selected group of the fine stage switches. Additionally, one fine stage switch is closed in each of the non-selected groups of fine stage switches. In one embodiment, the location of the closed switches in the non-selected groups is the mirror image of the location in an adjacent group. This reduces the transient voltages that occur when tap selection changes from one group to another.

Abstract translation: 可编程增益放大器（PGA）具有放大器和连接到放大器输出端的可变电阻器。 可变电阻器包括连接到参考电压的电阻器和分离电阻器的多个并联抽头。 具有精细级开关和粗级开关的两级开关网络将电阻抽头连接到PGA的输出节点。 抽头和相应的精细级开关被布置成两组或更多组，其中每组具有n个细级开关和相应的抽头。 每个精细级开关的一个端子连接到相应的电阻抽头，另一个端子连接到相应组的输出端子。 粗级开关从精细级开关组中选择，并连接到PGA的输出。 在运行期间，一个选择的分接头通过关闭适当的细级开关和粗级开关连接到PGA的输出，其中所选择的分接头定义了选定的精细级开关组。 此外，每个非选择的精细级开关组中的一个精细级开关闭合。 在一个实施例中，未选择组中的闭合开关的位置是相邻组中位置的镜像。 这样可以减少轻敲选择从一个组变为另一组时发生的瞬态电压。

公开(公告)号：US08443124B2

公开(公告)日：2013-05-14

申请号：US12659739

申请日：2010-03-19

Applicant: Kevin T. Chan ,  Michael Q. Le

Inventor： Kevin T. Chan ,  Michael Q. Le

IPC: G06F13/12 ,  H04L12/50

CPC classification number: H04L12/40013 ,  H04J3/0685 ,  H04L12/28 ,  H04L12/4625 ,  H04L43/00

Abstract: A physical layer device (PLD) includes a first serializer-deserializer (SERDES) device and a second SERDES device. Each SERDES device includes an analog portion with a serial port that is configured to communicate serial data with various network devices, and a digital portion that is configured to communicate parallel data with other various network devices. The PLD includes a first signal path that is configured to route serial data signals between the analog portions of the SERDES devices, bypassing the digital portions of the SERDES devices. Therefore, the SERDES devices can directly communicate serial data without performing parallel data conversion. A second signal path is configured to route recovered clock and data signals between the analog portions of the SERDES devices, but still bypassing the digital portions of the SERDES devices. The recovered clock and data signals are then regenerated before being transmitted over a network device.

公开(公告)号：US20110207421A1

公开(公告)日：2011-08-25

申请号：US13099031

申请日：2011-05-02

Applicant: Kevin T. Chan

Inventor： Kevin T. Chan

IPC: H01Q11/12

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：US07957711B2

公开(公告)日：2011-06-07

申请号：US12620215

申请日：2009-11-17

Applicant: Kevin T. Chan

Inventor： Kevin T. Chan

IPC: H04B1/04

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：US07933341B2

公开(公告)日：2011-04-26

申请号：US09797428

申请日：2001-02-28

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: H04L25/02

CPC classification number: H04L25/4975 ,  G09G5/006 ,  G09G2370/18 ,  H03M1/0604 ,  H03M1/1215 ,  H04L25/03146 ,  H04L25/03343 ,  H04L25/497

Abstract: Various systems and methods related to equalization precoding in a communications channel are disclosed. In one implementation preceding is performed on signals transmitted over an optical channel. In one implementation preceding 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，对通过光信道传输的信号执行以前的实现。 在一个实现中，并行执行解码操作，以便于在相对低成本的电路中实现高速处理。 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：US20100322120A1

公开(公告)日：2010-12-23

申请号：US12796329

申请日：2010-06-08

Applicant: Kevin T. Chan

Inventor： Kevin T. Chan

IPC: H04L5/14 ,  H04B15/00

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：US07733994B2

公开(公告)日：2010-06-08

申请号：US11383679

申请日：2006-05-16

Applicant: Kevin T. Chan

Inventor： Kevin T. Chan

IPC: H04B1/10 ,  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：US20100080271A1

公开(公告)日：2010-04-01

申请号：US12536024

申请日：2009-08-05

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

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

IPC: H04B1/38 ,  H04L27/00

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：US20090135890A1

公开(公告)日：2009-05-28

申请号：US12320041

申请日：2009-01-15

Applicant: Kevin T. Chan ,  Michael Q. Le

Inventor： Kevin T. Chan ,  Michael Q. Le

IPC: H04B1/38

CPC classification number: H04L12/40013 ,  H04J3/0685 ,  H04L12/28 ,  H04L12/4625 ,  H04L43/00

Abstract: A physical layer device (PLD) includes a first serializer-deserializer (SERDES) device and a second SERDES device. Each SERDES device includes an analog portion with a serial port that is configured to communicate serial data with various network devices, and a digital portion that is configured to communicate parallel data with other various network devices. The PLD includes a first signal path that is configured to route serial data signals between the analog portions of the SERDES devices, bypassing the digital portions of the SERDES devices. Therefore, the SERDES devices can directly communicate serial data without performing parallel data conversion. A second signal path is configured to route recovered clock and data signals between the analog portions of the SERDES devices, but still bypassing the digital portions of the SERDES devices. The recovered clock and data signals are then regenerated before being transmitted over a network device.

Abstract translation: 物理层设备（PLD）包括第一串行器 - 解串器（SERDES）设备和第二SERDES设备。 每个SERDES设备包括具有被配置为与各种网络设备通信串行数据的串行端口的模拟部分，以及被配置为与其他各种网络设备通信并行数据的数字部分。 PLD包括第一信号路径，其被配置为在SERDES设备的模拟部分之间路由串行数据信号，绕过SERDES设备的数字部分。 因此，SERDES设备可以直接通信串行数据，而无需执行并行数据转换。 第二信号路径被配置为在SERDES设备的模拟部分之间路由恢复的时钟和数据信号，但仍然绕过SERDES设备的数字部分。 恢复的时钟和数据信号在通过网络设备发送之前被重新生成。