公开(公告)号：US06870928B1

公开(公告)日：2005-03-22

申请号：US09866525

申请日：2001-05-25

申请人： Cormac S. Conroy ,  Samuel W. Sheng ,  Ara Bicakci ,  John DeCelles ,  Sang-Soo Lee

发明人： Cormac S. Conroy ,  Samuel W. Sheng ,  Ara Bicakci ,  John DeCelles ,  Sang-Soo Lee

IPC分类号： H04L25/02 ,  H04L27/00 ,  H04M1/738 ,  H04M11/06 ,  H04M1/00

CPC分类号： H04L27/0002 ,  H04L25/0266 ,  H04M1/738 ,  H04M11/062

摘要： A line interface couples signals between a data transceiver and a transmission line having a load impedance Z. The line interface includes a transformer, a driver circuit for supplying a transmit signal from the data transceiver to the transformer, and a receiver circuit for receiving a receive signal from the transformer. The transformer includes a first port coupled to the transmission line, a second port coupled to the driver circuit, a third port coupled to the receiver circuit, a first winding part having a turns ratio of 1: n, where n>1, for coupling the transmit signal from the second port to the first port, and a second winding part having a turns ratio of 1: m, where m

摘要翻译： 线路接口在数据收发器和具有负载阻抗Z的传输线之间耦合信号。线路接口包括变压器，用于从数据收发器向变压器提供发送信号的驱动器电路，以及用于接收接收器的接收器电路 来自变压器的信号。 变压器包括耦合到传输线的第一端口，耦合到驱动器电路的第二端口，耦合到接收器电路的第三端口，具有匝数比为1：n的第一绕组部件，其中n> 1，用于耦合 从第二端口到第一端口的发送信号和匝数比为1：m的第二绕组部分，其中m

公开(公告)号：US07020277B1

公开(公告)日：2006-03-28

申请号：US10011153

申请日：2001-12-05

申请人： Sang-Soo Lee ,  Samuel W. Sheng ,  Cormac S. Conroy

发明人： Sang-Soo Lee ,  Samuel W. Sheng ,  Cormac S. Conroy

IPC分类号： H04B1/52

CPC分类号： H04L25/0266

摘要： A line interface couples a data transceiver to a transmission line via a transformer, the data transceiver transmitting signals in a first frequency range and receiving signals in a second frequency range. The line interface includes an input port for receiving an input signal voltage from an analog front end (AFE) chip, an output port, a line driver for amplifying the input signal voltage and supplying a transmit signal to the output port, a line port for sending the transmit signal and receiving a receive signal, termination resistors coupled between the output port and the line port, a receive signal port for supplying the receive signal to the AFE chip, a receive amplifier formed on the AFE chip coupled to the receive signal port, and a bridge network resistively coupling the line port and the output port to the receive signal port, the bridge network having a low-pass filter characteristic.

摘要翻译： 线路接口通过变压器将数据收发器耦合到传输线，数据收发器在第一频率范围内传输信号并在第二频率范围内接收信号。 线路接口包括用于从模拟前端（AFE）芯片接收输入信号电压的输入端口，输出端口，用于放大输入信号电压并向输出端口提供发送信号的线路驱动器，用于 发送发送信号并接收接收信号，耦合在输出端口和线路端口之间的终端电阻器，用于将接收信号提供给AFE芯片的接收信号端口，耦合到接收信号端口的AFE芯片上形成的接收放大器 ，桥接网络将线路端口和输出端口电阻地耦合到接收信号端口，桥接网络具有低通滤波器特性。

公开(公告)号：US06724219B1

公开(公告)日：2004-04-20

申请号：US09882499

申请日：2001-06-15

申请人： Chun-Sup Kim ,  Ara Bicakci ,  Cormac S. Conroy ,  Sang-Soo Lee

发明人： Chun-Sup Kim ,  Ara Bicakci ,  Cormac S. Conroy ,  Sang-Soo Lee

IPC分类号： H04B303

CPC分类号： H04L25/0278 ,  H04L1/0001 ,  H04L25/028

摘要： A line driver for coupling a data transceiver to a transmission line having a load impedance via a transformer with a turns ratio of 1:n includes an input port for receiving an input signal voltage from the data transceiver, an output port for supplying an output signal voltage to the transformer, and an amplifier circuit for amplifying the input signal voltage. The amplifier circuit includes a first output stage, a second output stage coupled to the output port, an output resistor coupled to the first output stage, a feedback path from the first output stage to an input of the amplifier circuit, and a line matching network coupled between the first output stage and the second output stage, for compensating variations in the load impedance, so that a synthesized output impedance of the line driver substantially matches an actual load impedance Z of the transmission line.

摘要翻译： 用于将数据收发器耦合到具有匝数比为1：n的变压器的具有负载阻抗的传输线的线路驱动器包括用于从数据收发器接收输入信号电压的输入端口，用于提供输出信号的输出端口 变压器的电压和用于放大输入信号电压的放大器电路。 放大器电路包括第一输出级，耦合到输出端的第二输出级，耦合到第一输出级的输出电阻，从第一输出级到放大器电路的输入的反馈路径，以及线匹配网络 耦合在第一输出级和第二输出级之间，用于补偿负载阻抗的变化，使得线路驱动器的合成输出阻抗基本上与传输线的实际负载阻抗Z匹配。

公开(公告)号：US06215431B1

公开(公告)日：2001-04-10

申请号：US09323670

申请日：1999-06-01

申请人： Samuel W. Sheng ,  Cormac S. Conroy

发明人： Samuel W. Sheng ,  Cormac S. Conroy

IPC分类号： H03M100

CPC分类号： H03M1/0631 ,  H03H19/004 ,  H03M1/0614 ,  H03M1/66

摘要： A reconstruction filter is described. An input is configured to receive an output signal from a digital to analog converter. An input sampling circuit is operative to store a sample of the output signal from the digital to analog converter. An input pulse generating switch that generates a pulse, the energy of the pulse being determined by the sample of the output signal from the digital to analog converter. An amplifier receives the pulse at an amplifier input and provides an output signal at an amplifier output so that an output signal is produced that reduces distortion caused by imperfections in digital to analog converter.

摘要翻译： 描述重构滤波器。 输入被配置为从数模转换器接收输出信号。 输入采样电路用于存储来自数模转换器的输出信号的采样。 产生脉冲的输入脉冲发生开关，脉冲的能量由来自数模转换器的输出信号的样本确定。 放大器在放大器输入端接收脉冲，并在放大器输出端提供输出信号，从而产生输出信号，减少由数模转换器中的缺陷引起的失真。

公开(公告)号：US06498521B1

公开(公告)日：2002-12-24

申请号：US09998671

申请日：2001-11-29

申请人： Ara Bicakci ,  Sang-Soo Lee ,  Cormac S. Conroy

发明人： Ara Bicakci ,  Sang-Soo Lee ,  Cormac S. Conroy

IPC分类号： H03B100

CPC分类号： H04L25/0266

摘要： A dynamic supply control circuit is provided for a line driver. The line driver has an amplification factor G, receives an input signal voltage, and drives a transmission line having a load RL via a transformer having a turns ratio of 1:n. The circuit includes an input node for receiving an input signal voltage, a supply node for supplying a driving voltage to the line driver, a lift diode coupled between a fixed supply voltage and the supply node, a lift capacitor coupled between the supply node and an output node, and a lift amplifier having the amplification factor G coupled between the input node and the output node. The lift amplifier drives the lift capacitor when the input signal voltage is greater than an input threshold voltage, the input threshold voltage having a value greater than a common mode voltage of the input signal voltage.

摘要翻译： 为线路驱动器提供动态电源控制电路。 线路驱动器具有放大系数G，接收输入信号电压，并通过匝数比为1：n的变压器驱动具有负载RL的传输线。 电路包括用于接收输入信号电压的输入节点，用于向线路驱动器提供驱动电压的电源节点，耦合在固定电源电压和电源节点之间的升压二极管，耦合在电源节点和 输出节点和具有耦合在输入节点和输出节点之间的放大因子G的升降放大器。 当输入信号电压大于输入阈值电压时，升降放大器驱动提升电容器，输入阈值电压具有大于输入信号电压的共模电压的值。

公开(公告)号：US06459684B1

公开(公告)日：2002-10-01

申请号：US09250426

申请日：1999-02-16

申请人： Cormac S. Conroy ,  Samuel W. Sheng ,  Gregory T. Uehara

发明人： Cormac S. Conroy ,  Samuel W. Sheng ,  Gregory T. Uehara

IPC分类号： H04B320

CPC分类号： H04L5/023

摘要： An ADSL central office transmission system for transmitting downstream DMT signals to a plurality of remote ADSL transceiver is disclosed. The system includes a DMT digital signal transceiver that generates a time division multiplexed digital signal that includes a plurality of DMT signals to be sent on a plurality of ADSL lines. A digital to analog converter converts the time division multiplexed digital signal into a time division multiplexed analog signal that includes a plurality of analog DMT signals. The analog to digital converter has an output that outputs the time division multiplexed analog signal. A switch selectively connects the output of the digital to analog converter to each of a plurality of transmitters. The transmitters are configured to drive the plurality of ADSL lines. Thus, the plurality ADSL lines are driven by the plurality of analog DMT signals.

摘要翻译： 公开了一种用于将下行DMT信号发送到多个远程ADSL收发器的ADSL中心局传输系统。 该系统包括DMT数字信号收发器，其产生包括要在多条ADSL线路上发送的多个DMT信号的时分复用数字信号。 数模转换器将时分多路复用数字信号转换成包括多个模拟DMT信号的时分复用模拟信号。 模数转换器具有输出时分复用的模拟信号的输出。 开关选择性地将数模转换器的输出连接到多个发射器中的每一个。 发射机被配置为驱动多条ADSL线路。 因此，多个ADSL线由多个模拟DMT信号驱动。

公开(公告)号：US07276983B2

公开(公告)日：2007-10-02

申请号：US10940422

申请日：2004-09-13

申请人： Beomsup Kim ,  Cormac S. Conroy

发明人： Beomsup Kim ,  Cormac S. Conroy

IPC分类号： H03B5/12

CPC分类号： H03L7/18 ,  H03B5/1212 ,  H03B5/1228 ,  H03B5/1296 ,  H03B21/02 ,  H03L7/099 ,  H03L7/0995

摘要： A system and method are disclosed for generating a synthesized signal. A frequency synthesizer is used. The frequency synthesizer includes an input interface configured to receive an input signal having a reference frequency; a phase locked loop (PLL) coupled to the input interface, having a fractional N configuration and comprises a voltage controlled oscillator; wherein the voltage controlled oscillator is configured to generate the synthesized signal; and the voltage controlled oscillator includes an on-chip inductor.

摘要翻译： 公开了一种用于产生合成信号的系统和方法。 使用频率合成器。 频率合成器包括被配置为接收具有参考频率的输入信号的输入接口; 耦合到所述输入接口的锁相环（PLL），具有分数N配置并且包括压控振荡器; 其中所述压控振荡器被配置为产生所述合成信号; 并且压控振荡器包括片上电感器。

公开(公告)号：US07158760B1

公开(公告)日：2007-01-02

申请号：US10227634

申请日：2002-08-22

申请人： William B. Baringer ,  Cormac S. Conroy ,  Sang Oh Lee ,  Seok Kang ,  Beomsup Kim

发明人： William B. Baringer ,  Cormac S. Conroy ,  Sang Oh Lee ,  Seok Kang ,  Beomsup Kim

IPC分类号： H04B1/40 ,  H04B7/00 ,  H04B1/18

CPC分类号： H03L7/16

摘要： A system and method are disclosed for configuring a frequency synthesizer in a transceiver. Configuring a frequency synthesizer in a transceiver includes specifying a selection bit sequence wherein the selection bit sequence corresponds to a predetermined combination of transceiver characteristics; determining a plurality of synthesizer configuration parameters using the selection bit sequence; and configuring the frequency synthesizer using the plurality of synthesizer configuration parameters.

摘要翻译： 公开了一种用于在收发器中配置频率合成器的系统和方法。 在收发器中配置频率合成器包括指定选择位序列，其中选择位序列对应于收发器特性的预定组合; 使用所述选择比特序列确定多个合成器配置参数; 以及使用所述多个合成器配置参数来配置所述频率合成器。

公开(公告)号：US06292125B1

公开(公告)日：2001-09-18

申请号：US09408016

申请日：1999-09-29

申请人： Cormac S. Conroy

发明人： Cormac S. Conroy

IPC分类号： H03M180

CPC分类号： H03M1/1042 ,  H03M1/74

摘要： A digital-to-analog converter (“DAC”) and method for digital-to-analog conversion is disclosed. The DAC generally comprises a plurality of analog weights, a weight table adapted to store digital sizes of the plurality of analog weights, and a converter for searching for selected weights from the plurality of analog weights using the digital sizes stored in the weight table and for mapping a binary input to the selected analog weights. The digital sizes of all except for at least two of the analog weights are successively approximated using the assigned sizes of at least two of the analog weights. The method for digital-to-analog conversion, comprising receiving the binary input, searching for selected weights from analog weights using a weight table storing digital sizes of the analog weights, mapping the binary input to the selected weights, and outputting a sum of the selected analog weights.

摘要翻译： 公开了一种用于数模转换的数模转换器（“DAC”）和方法。 DAC通常包括多个模拟权重，适用于存储多个模拟权重的数字大小的权重表，以及用于使用存储在权重表中的数字大小从多个模拟权重中搜索所选权重的转换器， 将二进制输入映射到所选择的模拟权重。 使用至少两个模拟权重的分配尺寸，连续逼近除了至少两个模拟权重之外的所有数字大小。 一种用于数模转换的方法，包括接收二进制输入，使用存储模拟权重的数字大小的权重表搜索来自模拟权重的选定权重，将二进制输入映射到所选择的权重，并输出 选择的模拟重量。

公开(公告)号：US08224283B2

公开(公告)日：2012-07-17

申请号：US12139436

申请日：2008-06-13

申请人： Sanjeev Khushu ,  Cormac S. Conroy ,  Leonid S. Sheynblat

发明人： Sanjeev Khushu ,  Cormac S. Conroy ,  Leonid S. Sheynblat

IPC分类号： H05K11/00

CPC分类号： H04B1/034 ,  G01C21/3661 ,  H04H20/62 ,  H04H60/51 ,  H04H60/65 ,  H04H60/80

摘要： Methods and apparatus for determining an available FM frequency channel for interfacing with FM modulated output signals from a wireless device are described herein. A SPS receiver, such as a GPS receiver, can determine its position based on conventional techniques. The SPS receiver can determine one or more available FM channels over which audio output may be transmitted. The SPS receiver can use the determined position to access a local data base of available channels. Alternatively, the SPS receiver can use the determined position to access a local database of allocated channels in order to determine one or more available channels. The SPS receiver may display a prompt or message that indicates an FM channel over which output audio is modulated.

摘要翻译： 本文描述了用于确定与来自无线设备的FM调制输出信号对接的可用FM频道的方法和装置。 诸如GPS接收器的SPS接收机可以基于常规技术来确定其位置。 SPS接收机可以确定一个或多个可以在其上传输音频输出的可用FM频道。 SPS接收机可以使用确定的位置来访问可用信道的本地数据库。 或者，SPS接收机可以使用所确定的位置来访问分配的信道的本地数据库，以便确定一个或多个可用信道。 SPS接收机可以显示提示或消息，该提示或消息指示调制输出音频的FM通道。