公开(公告)号：US08289046B2

公开(公告)日：2012-10-16

申请号：US13173706

申请日：2011-06-30

申请人： Joseph Aziz ,  Andrew Chen ,  Derek Tam ,  Ark-Chew Wong ,  Agnes Neves Woo ,  Marcel Lugthart

发明人： Joseph Aziz ,  Andrew Chen ,  Derek Tam ,  Ark-Chew Wong ,  Agnes Neves Woo ,  Marcel Lugthart

IPC分类号： H03K17/16 ,  H03K19/003

CPC分类号： H04L25/0298

摘要： According to one exemplary embodiment, an active termination circuit includes at least one active termination branch, where the at least one active termination branch includes at least one transistor for providing an active termination output. The at least one active termination branch further includes an amplifier driving the at least one transistor, where the amplifier has a non-inverting input coupled to the active termination output via a feedback network. The amplifier controls a current flowing through the at least one transistor so as to provide the active termination output. The active termination output can be provided at a drain of the at least one transistor, where a source of the at least one transistor is coupled to ground through a degeneration transistor and a tail current sink.

摘要翻译： 根据一个示例性实施例，有源终端电路包括至少一个有源终端分支，其中所述至少一个有源终端分支包括用于提供有源终端输出的至少一个晶体管。 所述至少一个有源终端分支还包括驱动所述至少一个晶体管的放大器，其中所述放大器具有经由反馈网络耦合到所述有源终端输出的非反相输入。 放大器控制流过至少一个晶体管的电流，以便提供有源终端输出。 可以在至少一个晶体管的漏极处提供有源终端输出，其中至少一个晶体管的源极通过退化晶体管和尾部电流吸收器耦合到地。

公开(公告)号：US20100259300A1

公开(公告)日：2010-10-14

申请号：US12384795

申请日：2009-04-08

申请人： Joseph Aziz ,  Andrew Chen ,  Ark-Chew Wong ,  Derek Tam

发明人： Joseph Aziz ,  Andrew Chen ,  Ark-Chew Wong ,  Derek Tam

IPC分类号： H03K19/0175

CPC分类号： H03K19/017581 ,  H04L25/0282

摘要： In one embodiment, a circuit for providing a tail current for a line driver includes an adjustable current source. The adjustable current source includes a number of current source cells coupled together in a parallel configuration, where the current source cells are configured to provide the tail current for the line driver in response to a digital control signal. The circuit can further include a digital core coupled to the adjustable current source, where the digital core provides the digital control signal. The digital control signal provides a number of bits, where each bit controls one of the current source cells. In one embodiment, a current source cell can comprise a number of current source sub-cells. The current source cells can be configured to provide the tail current for the line driver in response to the digital control signal when the line driver is operating in a class AB mode.

摘要翻译： 在一个实施例中，用于为线路驱动器提供尾电流的电路包括可调电流源。 可调电流源包括以并联配置耦合在一起的多个电流源电池，其中电流源单元被配置为响应于数字控制信号为线路驱动器提供尾电流。 该电路还可以包括耦合到可调节电流源的数字核心，其中数字核心提供数字控制信号。 数字控制信号提供多个位，其中每个位控制当前源单元之一。 在一个实施例中，电流源单元可以包括多个电流源子单元。 当线路驱动器在AB类模式下操作时，当前源单元可被配置为响应于数字控制信号为线路驱动器提供尾电流。

公开(公告)号：US20110254584A1

公开(公告)日：2011-10-20

申请号：US13173706

申请日：2011-06-30

申请人： Joseph Aziz ,  Andrew Chen ,  Derek Tam ,  Ark-Chew Wong ,  Agnes Neves Woo ,  Marcel Lugthart

发明人： Joseph Aziz ,  Andrew Chen ,  Derek Tam ,  Ark-Chew Wong ,  Agnes Neves Woo ,  Marcel Lugthart

IPC分类号： H03K17/16

CPC分类号： H04L25/0298

摘要： According to one exemplary embodiment, an active termination circuit includes at least one active termination branch, where the at least one active termination branch includes at least one transistor for providing an active termination output. The at least one active termination branch further includes an amplifier driving the at least one transistor, where the amplifier has a non-inverting input coupled to the active termination output via a feedback network. The amplifier controls a current flowing through the at least one transistor so as to provide the active termination output. The active termination output can be provided at a drain of the at least one transistor, where a source of the at least one transistor is coupled to ground through a degeneration transistor and a tail current sink.

摘要翻译： 根据一个示例性实施例，有源终端电路包括至少一个有源终端分支，其中所述至少一个有源终端分支包括用于提供有源终端输出的至少一个晶体管。 所述至少一个有源终端分支还包括驱动所述至少一个晶体管的放大器，其中所述放大器具有经由反馈网络耦合到所述有源终端输出的非反相输入。 放大器控制流过至少一个晶体管的电流，以便提供有源终端输出。 可以在至少一个晶体管的漏极处提供有源终端输出，其中至少一个晶体管的源极通过退化晶体管和尾部电流吸收器耦合到地。

公开(公告)号：US07982491B2

公开(公告)日：2011-07-19

申请号：US12384793

申请日：2009-04-08

申请人： Joseph Aziz ,  Andrew Chen ,  Derek Tam ,  Ark-Chew Wong ,  Agnes Neves Woo ,  Marcel Lugthart

发明人： Joseph Aziz ,  Andrew Chen ,  Derek Tam ,  Ark-Chew Wong ,  Agnes Neves Woo ,  Marcel Lugthart

IPC分类号： H03K17/16 ,  H03K19/003

CPC分类号： H04L25/0298

摘要： According to one exemplary embodiment, an active termination circuit includes at least one active termination branch, where the at least one active termination branch includes at least one transistor for providing an active termination output. The at least one active termination branch further includes an amplifier driving the at least one transistor, where the amplifier has a non-inverting input coupled to the active termination output via a feedback network. The amplifier controls a current flowing through the at least one transistor so as to provide the active termination output. The active termination output can be provided at a drain of the at least one transistor, where a source of the at least one transistor is coupled to ground through a degeneration transistor and a tail current sink.

摘要翻译： 根据一个示例性实施例，有源终端电路包括至少一个有源终端分支，其中所述至少一个有源终端分支包括用于提供有源终端输出的至少一个晶体管。 所述至少一个有源终端分支还包括驱动所述至少一个晶体管的放大器，其中所述放大器具有经由反馈网络耦合到所述有源终端输出的非反相输入。 放大器控制流过至少一个晶体管的电流，以便提供有源终端输出。 可以在至少一个晶体管的漏极处提供有源终端输出，其中至少一个晶体管的源极通过退化晶体管和尾部电流吸收器耦合到地。

公开(公告)号：US08183885B2

公开(公告)日：2012-05-22

申请号：US12384795

申请日：2009-04-08

申请人： Joseph Aziz ,  Andrew Chen ,  Ark-Chew Wong ,  Derek Tam

发明人： Joseph Aziz ,  Andrew Chen ,  Ark-Chew Wong ,  Derek Tam

IPC分类号： H03K19/094

CPC分类号： H03K19/017581 ,  H04L25/0282

摘要： In one embodiment, a circuit for providing a tail current for a line driver includes an adjustable current source. The adjustable current source includes a number of current source cells coupled together in a parallel configuration, where the current source cells are configured to provide the tail current for the line driver in response to a digital control signal. The circuit can further include a digital core coupled to the adjustable current source, where the digital core provides the digital control signal. The digital control signal provides a number of bits, where each bit controls one of the current source cells. In one embodiment, a current source cell can comprise a number of current source sub-cells. The current source cells can be configured to provide the tail current for the line driver in response to the digital control signal when the line driver is operating in a class AB mode.

摘要翻译： 在一个实施例中，用于为线路驱动器提供尾电流的电路包括可调电流源。 可调电流源包括以并联配置耦合在一起的多个电流源电池，其中电流源单元被配置为响应于数字控制信号为线路驱动器提供尾电流。 该电路还可以包括耦合到可调节电流源的数字核心，其中数字核心提供数字控制信号。 数字控制信号提供多个位，其中每个位控制当前源单元之一。 在一个实施例中，电流源单元可以包括多个电流源子单元。 当线路驱动器在AB类模式下操作时，当前源单元可被配置为响应于数字控制信号为线路驱动器提供尾电流。

公开(公告)号：US20100259340A1

公开(公告)日：2010-10-14

申请号：US12384793

申请日：2009-04-08

申请人： Joseph Aziz ,  Andrew Chen ,  Derek Tam ,  Ark-Chew Wong ,  Agnes Neves Woo ,  Marcel Lugthart

发明人： Joseph Aziz ,  Andrew Chen ,  Derek Tam ,  Ark-Chew Wong ,  Agnes Neves Woo ,  Marcel Lugthart

IPC分类号： H03H7/38

CPC分类号： H04L25/0298

摘要： According to one exemplary embodiment, an active termination circuit includes at least one active termination branch, where the at least one active termination branch includes at least one transistor for providing an active termination output. The at least one active termination branch further includes an amplifier driving the at least one transistor, where the amplifier has a non-inverting input coupled to the active termination output via a feedback network. The amplifier controls a current flowing through the at least one transistor so as to provide the active termination output. The active termination output can be provided at a drain of the at least one transistor, where a source of the at least one transistor is coupled to ground through a degeneration transistor and a tail current sink.

摘要翻译： 根据一个示例性实施例，有源终端电路包括至少一个有源终端分支，其中所述至少一个有源终端分支包括用于提供有源终端输出的至少一个晶体管。 所述至少一个有源终端分支还包括驱动所述至少一个晶体管的放大器，其中所述放大器具有经由反馈网络耦合到所述有源终端输出的非反相输入。 放大器控制流过至少一个晶体管的电流，以便提供有源终端输出。 可以在至少一个晶体管的漏极处提供有源终端输出，其中至少一个晶体管的源极通过退化晶体管和尾部电流吸收器耦合到地。

公开(公告)号：US20110204967A1

公开(公告)日：2011-08-25

申请号：US12660430

申请日：2010-02-25

申请人： Ark-Chew Wong ,  Joseph Aziz ,  Derek Tam ,  Kevin Chan

发明人： Ark-Chew Wong ,  Joseph Aziz ,  Derek Tam ,  Kevin Chan

IPC分类号： H04B3/00

CPC分类号： H04B3/30 ,  H04L25/0272

摘要： Disclosed is a false-link protection circuit comprising at least one native switch coupled between a communication terminal of a first differential switch and a communication terminal of a second differential switch. The at least one native switch is configured to provide an attenuation path for a pulse link signal received by either communication terminal when the first and second differential switches are in a powered down state. According to one embodiment, a method to attenuate a pulse link signal comprises activating a native switch of a false-link protection circuit by powering down first and second differential switches, receiving a pulse link signal at a communication terminal of one of the first and second differential switches, and attenuating the pulse link signal by diverting it through the false-link protection circuit when the first and second differential switches are in a powered down state.

摘要翻译： 公开了一种假连接保护电路，其包括耦合在第一差分开关的通信终端和第二差分开关的通信终端之间的至少一个本地开关。 至少一个本地开关被配置为当第一和第二差分开关处于断电状态时，为通信终端接收的脉冲链路信号提供衰减路径。 根据一个实施例，一种衰减脉冲链路信号的方法包括通过断电第一和第二差分开关来激活假链路保护电路的本地交换机，在第一和第二差分开关之一的通信终端处接收脉冲链路信号 差分开关，并且当第一和第二差分开关处于掉电状态时，通过将其通过假链路保护电路分流来衰减脉冲链路信号。

公开(公告)号：US08228091B2

公开(公告)日：2012-07-24

申请号：US12660430

申请日：2010-02-25

申请人： Ark-Chew Wong ,  Joseph Aziz ,  Derek Tam ,  Kevin Chan

发明人： Ark-Chew Wong ,  Joseph Aziz ,  Derek Tam ,  Kevin Chan

IPC分类号： H03K19/007

CPC分类号： H04B3/30 ,  H04L25/0272

摘要： Disclosed is a false-link protection circuit comprising at least one native switch coupled between a communication terminal of a first differential switch and a communication terminal of a second differential switch. The at least one native switch is configured to provide an attenuation path for a pulse link signal received by either communication terminal when the first and second differential switches are in a powered down state. According to one embodiment, a method to attenuate a pulse link signal comprises activating a native switch of a false-link protection circuit by powering down first and second differential switches, receiving a pulse link signal at a communication terminal of one of the first and second differential switches, and attenuating the pulse link signal by diverting it through the false-link protection circuit when the first and second differential switches are in a powered down state.

摘要翻译： 公开了一种假连接保护电路，其包括耦合在第一差分开关的通信终端和第二差分开关的通信终端之间的至少一个本地开关。 至少一个本地开关被配置为当第一和第二差分开关处于断电状态时，为通信终端接收的脉冲链路信号提供衰减路径。 根据一个实施例，一种衰减脉冲链路信号的方法包括通过断电第一和第二差分开关来激活假链路保护电路的本地交换机，在第一和第二差分开关之一的通信终端处接收脉冲链路信号 差分开关，并且当第一和第二差分开关处于掉电状态时，通过将其通过假链路保护电路分流来衰减脉冲链路信号。

公开(公告)号：US20100225362A1

公开(公告)日：2010-09-09

申请号：US12381227

申请日：2009-03-09

申请人： Andrew Chen ,  Joseph Aziz ,  Derek Tam

发明人： Andrew Chen ,  Joseph Aziz ,  Derek Tam

IPC分类号： H03B1/00

CPC分类号： H03F3/45183 ,  H03F3/45744 ,  H03F2200/447 ,  H03F2203/45682 ,  H03F2203/45688

摘要： According to one exemplary embodiment, a transmitter module includes a line drive including a current digital-to-analog converter, where the line driver provides an analog output waveform. The current digital-to-analog converter receives a digitally filtered input waveform including at least two voltage steps. The at least two voltage steps of the digitally filtered input waveform cause a rise time of the analog output waveform to have a reduced dependency on process, voltage, and temperature variations in the line driver, while meeting stringent rise time requirements. The digitally filtered input waveform has an initial voltage level and a final voltage level, where the final voltage level is substantially equal to a sum of the at least two voltage steps of the digitally filtered input waveform.

摘要翻译： 根据一个示例性实施例，发射机模块包括线路驱动器，其包括当前的数模转换器，其中线路驱动器提供模拟输出波形。 当前的数模转换器接收包括至少两个电压步骤的经数字滤波的输入波形。 数字滤波的输入波形的至少两个电压阶段导致模拟输出波形的上升时间对线路驱动器中的过程，电压和温度变化的依赖性降低，同时满足严格的上升时间要求。 经数字滤波的输入波形具有初始电压电平和最终电压电平，其中最终电压电平基本上等于数字滤波输入波形的至少两个电压阶跃之和。

公开(公告)号：US20110199129A1

公开(公告)日：2011-08-18

申请号：US13095688

申请日：2011-04-27

申请人： Andrew Chen ,  Joseph Aziz ,  Derek Tam

发明人： Andrew Chen ,  Joseph Aziz ,  Derek Tam

IPC分类号： H03B1/00

CPC分类号： H03F3/45183 ,  H03F3/45744 ,  H03F2200/447 ,  H03F2203/45682 ,  H03F2203/45688

摘要： According to one exemplary embodiment, a transmitter module includes a line drive including a current digital-to-analog converter, where the line driver provides an analog output waveform. The current digital-to-analog converter receives a digitally filtered input waveform including at least two voltage steps. The at least two voltage steps of the digitally filtered input waveform cause a rise time of the analog output waveform to have a reduced dependency on process, voltage, and temperature variations in the line driver, while meeting stringent rise time requirements. The digitally filtered input waveform has an initial voltage level and a final voltage level, where the final voltage level is substantially equal to a sum of the at least two voltage steps of the digitally filtered input waveform.

摘要翻译： 根据一个示例性实施例，发射机模块包括线路驱动器，其包括当前的数模转换器，其中线路驱动器提供模拟输出波形。 当前的数模转换器接收包括至少两个电压步骤的经数字滤波的输入波形。 数字滤波的输入波形的至少两个电压阶段导致模拟输出波形的上升时间对线路驱动器中的过程，电压和温度变化的依赖性降低，同时满足严格的上升时间要求。 经数字滤波的输入波形具有初始电压电平和最终电压电平，其中最终电压电平基本上等于数字滤波输入波形的至少两个电压阶跃之和。