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：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：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：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：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。

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：US08598917B2

公开(公告)日：2013-12-03

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。

公开(公告)号：US07944251B2

公开(公告)日：2011-05-17

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。