公开(公告)号：US6049258A

公开(公告)日：2000-04-11

申请号：US75373

申请日：1998-05-11

申请人： Marwan A. Fawal ,  Anthony Liem Pan ,  Eric Roger Davis ,  Richard Sidney Reid

发明人： Marwan A. Fawal ,  Anthony Liem Pan ,  Eric Roger Davis ,  Richard Sidney Reid

IPC分类号： H01F17/00 ,  H01F19/04 ,  H03H7/09

CPC分类号： H01F17/0006 ,  H01F19/04 ,  H01F2019/085 ,  H03H2001/0078 ,  H03H7/427

摘要： One embodiment of the invention includes a transformer that is at least partially formed on a substrate. The transformer is for electrical isolation and signal filtering. The transformer includes the following elements. A portion of the substrate has two holes through the substrate. A ferrite core is formed in a loop through the two holes. A primary winding is made of a first metal trace. The first metal trace is formed in a spiral around one hole. The first metal trace has at least two primary terminals acting as an input to the transformer. The transformer also includes a secondary winding. The secondary winding is made of a second metal trace. The second metal trace is formed in a spiral around the other hole. The second metal trace has at least two secondary terminals acting as an output from the transformer. The parasitic capacitance of the first metal trace and the magnetizing inductance of the primary winding cause signals received at the primary terminals to be filtered as the signals are passed through the transformer to the secondary terminals.

摘要翻译： 本发明的一个实施例包括至少部分地形成在基板上的变压器。 变压器用于电气隔离和信号滤波。 变压器包括以下元件。 衬底的一部分具有穿过衬底的两个孔。 铁氧体磁芯通过这两个孔形成环路。 初级绕组由第一金属轨迹制成。 第一个金属轨迹围绕一个孔形成螺旋形。 第一金属轨迹具有至少两个初级端子用作变压器的输入端。 变压器还包括一个次级绕组。 次级绕组由第二金属轨迹制成。 第二金属轨迹围绕另一个孔形成螺旋形。 第二金属轨迹具有至少两个用作变压器的输出的次级端子。 第一金属迹线的寄生电容和初级绕组的磁化电感使得信号在初级端子处接收的信号被滤波，因为信号通过变压器到二级端子。

公开(公告)号：US06252532B1

公开(公告)日：2001-06-26

申请号：US09031368

申请日：1998-02-26

申请人： Marwan A. Fawal ,  Burton B. Lo ,  George Kwan

发明人： Marwan A. Fawal ,  Burton B. Lo ,  George Kwan

IPC分类号： H03M166

CPC分类号： H04L12/40032 ,  H04L12/413

摘要： A system for reducing electromagnetic interference emissions is described. The system can include a network interface card with an Ethernet controller circuit. The Ethernet controller circuit uses a pair of programmable digital to analog converters to generate an Ethernet output signal that includes a pre-emphasis component and a data component. The Ethernet controller circuit monitors the Ethernet output signal and adjust the levels of the pre-emphasis component and the data component by adjusting the values to the digital to analog converters. By making these adjustments, the system reduces the electromagnetic interference caused by the network interface card but maintains valid Ethernet signals.

摘要翻译： 描述了用于减少电磁干扰发射的系统。 该系统可以包括具有以太网控制器电路的网络接口卡。 以太网控制器电路使用一对可编程数模转换器来产生包括预加重组件和数据组件的以太网输出信号。 以太网控制器电路监视以太网输出信号，并通过调整数模转换器的值来调整预加重组件和数据组件的电平。 通过进行这些调整，系统降低了网络接口卡引起的电磁干扰，但维护了有效的以太网信号。

公开(公告)号：US5966382A

公开(公告)日：1999-10-12

申请号：US866566

申请日：1997-05-30

申请人： Marwan A. Fawal ,  Burton B. Lo

发明人： Marwan A. Fawal ,  Burton B. Lo

IPC分类号： H04L12/413 ,  H04L12/28 ,  H04J3/16

CPC分类号： H04L25/0266 ,  H04L12/413

摘要： A system comprising the following elements. An ethernet controller circuit for generating ethernet data signals. An isolation circuit coupled to receive the ethernet data signals and for generating ethernet output signals. The ethernet output signals including primarily a first sine wave signal, a second sign wave signal, and a set of signals. The first sine wave signal is at a frequency approximately equal to the frequency of the ethernet data signals. The second sine wave signal is at a frequency approximately one half the frequency of the first sine wave signal. The third set of signals is for transitioning between said first sine wave signal and said second sine wave signal. In this embodiment, the high frequency components of the output signals is significantly reduced, which results in reduced electromagnetic interference from the system.

摘要翻译： 一种包括以下元件的系统。 用于产生以太网数据信号的以太网控制器电路。 隔离电路，用于接收以太网数据信号并产生以太网输出信号。 以太网输出信号主要包括第一正弦波信号，第二符号波信号和一组信号。 第一个正弦波信号的频率大约等于以太网数据信号的频率。 第二正弦波信号的频率大约是第一正弦波信号的频率的一半。 第三组信号用于在所述第一正弦波信号和所述第二正弦波信号之间转换。 在本实施例中，输出信号的高频分量显着降低，从而降低了来自系统的电磁干扰。

公开(公告)号：US06452938B1

公开(公告)日：2002-09-17

申请号：US09031265

申请日：1998-02-26

申请人： Marwan A. Fawal ,  Burton B. Lo ,  Anthony L. Pan ,  George Kwan

发明人： Marwan A. Fawal ,  Burton B. Lo ,  Anthony L. Pan ,  George Kwan

IPC分类号： H04L1266

CPC分类号： H04L43/50

摘要： A system for reducing electromagnetic interference emissions is described. The system can include a network interface card with an Ethernet controller circuit. The Ethernet controller circuit generates an Ethernet output signal that includes a pre-emphasis component and a data component. The Ethernet controller circuit monitors the Ethernet output signal and adjusts the levels of the pre-emphasis component and the data component to reduce the electromagnetic interference caused by the network interface card but still fit the requirements for valid Ethernet signals.

摘要翻译： 描述了用于减少电磁干扰发射的系统。 该系统可以包括具有以太网控制器电路的网络接口卡。 以太网控制器电路产生包括预加重组件和数据组件的以太网输出信号。 以太网控制器电路监视以太网输出信号，并调整预加重组件和数据组件的电平，以减少网络接口卡引起的电磁干扰，但仍符合有效的以太网信号要求。

公开(公告)号：US5793260A

公开(公告)日：1998-08-11

申请号：US641101

申请日：1996-04-26

申请人： Marwan A. Fawal ,  Burton B. Lo ,  Ruchi Wadhawan

发明人： Marwan A. Fawal ,  Burton B. Lo ,  Ruchi Wadhawan

IPC分类号： H01L21/822 ,  H01L27/04 ,  H03K3/0231 ,  H01G9/048 ,  H03L7/085

CPC分类号： H03K3/0231

摘要： A current-controlled oscillator with first and second differential comparators (640, 840) serving as inputs, first and second voltage independent multi-layered integrated capacitors (600, 800) corresponding to the first and second comparators (640, 840), and a RS latch (700) for switching operation between the two comparators (640, 840) thereby achieving oscillation. The multi-layered integrated capacitors (600, 800) are designed to provide voltage independent capacitance.

摘要翻译： 具有用作输入的第一和第二差分比较器（640,840）的电流控制振荡器，对应于第一和第二比较器（640,840）的第一和第二电压无关多层集成电容器（600,800），以及 RS锁存器（700），用于在两个比较器（640,840）之间切换操作，从而实现振荡。 多层集成电容器（600,800）被设计成提供电压独立的电容。

公开(公告)号：US06341135B1

公开(公告)日：2002-01-22

申请号：US09032382

申请日：1998-02-26

申请人： Marwan A. Fawal ,  Burton B. Lo ,  Anthony L. Pan

发明人： Marwan A. Fawal ,  Burton B. Lo ,  Anthony L. Pan

IPC分类号： G01R1900

CPC分类号： H04L25/0266 ,  H04L12/40032 ,  H04L25/0272 ,  H04L25/028 ,  H04L25/0286 ,  H04L25/0292

摘要： NMOS transistor buffers are used to buffer the output of a system. The system can include a network interface card. The NMOS transistor buffers receive the output of the shaped Ethernet data signals and drive a transformer. The NMOS transistor buffers allow for low power consumption while a feedback monitoring system provides stability by controlling the inputs to the NMOS transistors.

摘要翻译： NMOS晶体管缓冲器用于缓冲系统的输出。 该系统可以包括一个网络接口卡。 NMOS晶体管缓冲器接收成形以太网数据信号的输出并驱动变压器。 NMOS晶体管缓冲器允许低功耗，而反馈监控系统通过控制对NMOS晶体管的输入来提供稳定性。

公开(公告)号：US5136182A

公开(公告)日：1992-08-04

申请号：US576020

申请日：1990-08-31

申请人： Marwan A. Fawal

发明人： Marwan A. Fawal

IPC分类号： G05F1/46 ,  G05F3/24 ,  H03K19/003

CPC分类号： H03K19/00384 ,  G05F1/462 ,  G05F3/245 ,  G05F3/247

摘要： A controlled voltage or current source comprises a first CMOS active voltage divider, which generates a first reference voltage at a first reference node as a first function of temperature, and a second CMOS active voltage divider, which generates a second reference voltage at a second reference node as a second function of temperature. A CMOS difference amplifier, generates the controlled voltage as a function of the difference between the first reference voltage and the second voltage reference, and of a third function of temperature. A final amplifier stage offsets changes in the source voltage. In another aspect, temperature compensated NAND and NOR gates are provided using the controlled voltage source.

摘要翻译： 受控电压或电流源包括第一CMOS有源分压器，其在第一参考节点处产生作为温度的第一函数的第一参考电压;以及第二CMOS有源分压器，其在第二参考时产生第二参考电压 节点作为温度的第二个功能。 CMOS差分放大器产生作为第一参考电压和第二参考电压之间的差的函数的受控电压和第三温度函数。 最终的放大器级别抵消源极电压的变化。 在另一方面，使用受控电压源提供温度补偿NAND和NOR门。