公开(公告)号：US07839993B2

公开(公告)日：2010-11-23

申请号：US10821781

申请日：2004-04-09

申请人： Stefan Barkarö ,  Torbjörn Randahl

发明人： Stefan Barkarö ,  Torbjörn Randahl

IPC分类号： H04M1/00 ,  H04M9/00

CPC分类号： H03H11/30 ,  H04B3/03 ,  H04L5/1423

摘要： In a line driver/receiver circuit where the line driver is connected with its output terminals to a load for supplying a transmit signal thereto and where the receiver is connected with its input terminals to the load for simultaneously receiving a receive signal therefrom, the transmit signal on the input terminals of the receiver is canceled by connecting the output terminals of the line driver to the load via equal complex sense impedances of an impedance value that is much smaller than the impedance value of the load impedance to match the load impedance, connecting the input terminals of the receiver to the load via equal first resistors and to respective output terminal of the line driver via equal second resistors, and providing transconductance amplifiers to sense the voltage across the sense impedances and supply corresponding currents to respective input terminal of the line driver.

摘要翻译： 在线路驱动器与其输出端子连接到用于提供发送信号的负载并且其中接收机与其输入端子连接到负载以同时从其接收接收信号的线路驱动器/接收机电路中，发送信号 通过将阻抗值相等的复数检测阻抗与负载阻抗的阻抗值相比，将线路驱动器的输出端子连接到负载来抵消接收器的输入端子，以匹配负载阻抗， 通过相等的第一电阻器将接收器的输入端子连接到负载，并通过相等的第二电阻器连接到线路驱动器的相应输出端子，并且提供跨导放大器来感测检测阻抗上的电压，并将对应的电流提供给线路驱动器的相应输入端子 。

公开(公告)号：US06757834B2

公开(公告)日：2004-06-29

申请号：US09826962

申请日：2001-04-06

申请人： Torbjörn Randahl ,  Albin Johansson ,  Anders Söderbärg ,  Tore André ,  Allan Olson

发明人： Torbjörn Randahl ,  Albin Johansson ,  Anders Söderbärg ,  Tore André ,  Allan Olson

IPC分类号： G06F132

CPC分类号： H04L25/028 ,  H03G3/004 ,  H04L25/0272

摘要： To minimize power dissipation in a line driver (3) in a central office (CO) for driving a DSL connection to a network terminal (NT) with a predetermined maximum constellation size, the central office (CO) supplies the line driver (3) with a predetermined supply voltage during a training sequence, and transfers data with a predetermined power spectral density in all available channels. The network terminal (NT) measures the signal-to-noise ratio of each channel, and transfers information to the central office (CO) about channels having signal-to-noise ratios that enable transfer of data. The central office (CO) reduces the power spectral density to a lowest possible value that still enables transfer of data in all channels having signal-to-noise ratios above a predetermined threshold as set by the maximum constellation size, calculates a sum of power to be transmitted in said channels, converts said sum into a corresponding line driver output voltage, and reduces the line driver supply voltage in correspondence thereto.

摘要翻译： 为了最小化用于以预定的最大星座大小驱动到网络终端（NT）的DSL连接的中心局（CO）中的线路驱动器（3）中的功率消耗，中心局（CO）提供线路驱动器（3） 在训练序列期间具有预定的电源电压，并且在所有可用信道中以预定功率谱密度传送数据。 网络终端（NT）测量每个信道的信噪比，并将关于具有使能传输数据的信噪比的信道的信息传送到中心局（CO）。 中心局（CO）将功率谱密度降低到最低可能的值，该最小可能值仍然能够传输具有由最大星座大小设定的高于预定阈值的信噪比的所有信道中的数据， 在所述通道中发送，将所述和转换成相应的线路驱动器输出电压，并且相应地降低线路驱动器电源电压。

公开(公告)号：US06687370B1

公开(公告)日：2004-02-03

申请号：US09717119

申请日：2000-11-22

申请人： Stefan Barkarö ,  Torbjörn Randahl

发明人： Stefan Barkarö ,  Torbjörn Randahl

IPC分类号： H04M100

CPC分类号： H04L5/0058 ,  H04L5/0007 ,  H04L5/0044 ,  H04M11/062

摘要： To secure an ADSL connection between a first ADSL transceiver (4) in a central office and a second ADSL transceiver (5) on a subscriber's premises on a telephone line (1) between a SLIC (2) in the central office and a telephone (3), a request to the SLIC (2) to apply a ringing signal to the telephone line (1) is detected. In response to such detection, the first ADSL transceiver (4) switches from a normal bit rate to a lower bit rate for the ADSL connection, and orders the second ADSL transceiver (5) to do the same before the ringing signal is applied. In response to an off-hook condition, the lower bit rate is maintained for the ADSL connection. In response to an on-hook condition after the off-hook condition as well as in response to a disappearance of the ringing request without an off-hook condition, the first ADSL transceiver (4) switches back to the normal bit rate and orders the second ADSL transceiver (5) to do the same.

摘要翻译： 为了确保中心局中的第一ADSL收发器（4）与中心局的SLIC（2）之间的电话线（1）上的用户住宅上的第二ADSL收发器（5）之间的ADSL连接， 检测到向SLIC（2）向电话线（1）发送振铃信号的请求。 响应于这种检测，第一ADSL收发器（4）从正常比特率切换到用于ADSL连接的较低比特率，并且在应用振铃信号之前将第二ADSL收发器（5）命令做相同的操作。 响应于摘机状态，为ADSL连接维持较低的比特率。 响应于在摘机状态之后的挂机状况以及响应于没有摘机状态的振铃请求的消失，第一ADSL收发器（4）切换回正常比特率并且命令 第二个ADSL收发器（5）做同样的事情。

公开(公告)号：US20100289523A1

公开(公告)日：2010-11-18

申请号：US12845024

申请日：2010-07-28

申请人： STEFAN BARKARÖ ,  TORBJÖRN RANDAHL

发明人： STEFAN BARKARÖ ,  TORBJÖRN RANDAHL

IPC分类号： H03K17/16

CPC分类号： H03H11/30 ,  H04B3/03 ,  H04L5/1423

摘要： In a line driver/receiver circuit where the line driver is connected with its output terminals to a load for supplying a transmit signal thereto and where the receiver is connected with its input terminals to the load for simultaneously receiving a receive signal therefrom, the transmit signal on the input terminals of the receiver is canceled by connecting the output terminals of the line driver to the load via equal complex sense impedances of an impedance value that is much smaller than the impedance value of the load impedance to match the load impedance, connecting the input terminals of the receiver to the load via equal first resistors and to respective output terminal of the line driver via equal second resistors, and providing transconductance amplifiers to sense the voltage across the sense impedances and supply corresponding currents to respective input terminal of the line driver.

摘要翻译： 在线路驱动器与其输出端子连接到用于提供发送信号的负载并且其中接收器与其输入端子连接到负载以同时从其接收接收信号的线路驱动器/接收机电路中，发送信号 通过将阻抗值相等的复数检测阻抗与负载阻抗的阻抗值相比，将线路驱动器的输出端子连接到负载来抵消接收器的输入端子，以匹配负载阻抗， 通过相等的第一电阻器将接收器的输入端子连接到负载，并通过相等的第二电阻器连接到线路驱动器的相应输出端子，并且提供跨导放大器来感测检测阻抗上的电压，并将对应的电流提供给线路驱动器的相应输入端子 。

公开(公告)号：US06625175B1

公开(公告)日：2003-09-23

申请号：US09439131

申请日：1999-11-12

申请人： Torbjörn Randahl ,  Stefan Barkarö

发明人： Torbjörn Randahl ,  Stefan Barkarö

IPC分类号： H04J102

CPC分类号： H04M11/062

摘要： To secure an ADSL connection to an ADSL transceiver connected to a telephone line to be used also by an associated telephone, the telephone is normally kept disconnected from the telephone line and a predetermined number of bits is allocated to the ADSL connection. Upon an off-hook condition of the telephone in connection with an outgoing call, and upon a presence of a ringing signal on the telephone line or an off-hook condition of the telephone in connection with an incoming call, a predetermined lower number of bits is allocated to the ADSL connection before the telephone is connected to the telephone line.

摘要翻译： 为了确保连接到电话线的ADSL收发机的ADSL连接以供相关联的电话使用，电话机通常与电话线路断开连接，预定数量的比特分配给ADSL连接。 在与呼出呼叫相关联的电话机的摘机状态下，以及在电话线路上存在振铃信号或者与来话呼叫相关联的电话机摘机状态时，预定的较低数量的比特 在电话连接到电话线之前分配给ADSL连接。

公开(公告)号：US06636605B1

公开(公告)日：2003-10-21

申请号：US09468365

申请日：1999-12-21

申请人： Torbjörn Randahl ,  Stefan Barkarö

发明人： Torbjörn Randahl ,  Stefan Barkarö

IPC分类号： H04M100

CPC分类号： H04B3/23

摘要： At the output of a line driver (1) connected to a long transmission line, signals received on the transmission line are only a fraction of signals transmitted by the line driver on the transmission line. To minimize the transmitted signal with its distortion and noise in the receive path of the line driver, an additional driver (4) having the same voltages and currents in the signal path, is added. The additional driver (4) drives an additional load (Z2). The signal transmitted to the transmission line together with its superimposed received signal, is subtracted from the signal from the additional driver (4), which is not superimposed on any received signal. The resulting signal is reduced from transmitted signal, transmitted distortion and transmitted noise. To minimize die size and power consumption, the additional driver (4) is scaled, but the distortion remains unchanged compared to the “normal” line driver.

摘要翻译： 在连接到长传输线路的线路驱动器（1）的输出端，在传输线路上接收的信号仅是传输线路上线路驱动器传输的信号的一小部分。 为了最小化其在线路驱动器的接收路径中的失真和噪声的传输信号，在信号路径中增加具有相同电压和电流的附加驱动器（4）。 附加驱动器（4）驱动额外的负载（Z2）。 从附加驱动器（4）的信号中减去与其叠加的接收信号一起发送到传输线的信号，该信号不叠加在任何接收的信号上。 所产生的信号从发射信号，发射失真和发射噪声中减少。 为了最小化芯片尺寸和功耗，附加驱动器（4）被缩放，但是与“正常”线路驱动器相比，失真保持不变。