公开(公告)号：US07592863B2

公开(公告)日：2009-09-22

申请号：US11755125

申请日：2007-05-30

申请人： Hassan Elwan ,  Amr Fahim ,  Edward Youssounan ,  Ahmed A. Emira ,  Dejun Wang

发明人： Hassan Elwan ,  Amr Fahim ,  Edward Youssounan ,  Ahmed A. Emira ,  Dejun Wang

IPC分类号： H03K5/00

CPC分类号： H03H11/10 ,  H03H11/1291 ,  H03H11/525

摘要： A noise shaping and voltage gain filtering third order electrical circuit and method comprises at least one pair of input resistors; a Frequency Dependent Negative Resistance (FDNR) filter positioned in between the at least one pair of input resistors; a feedback resistor; and an amplifier operatively connected to the feedback resistor and the at least one pair of input resistors, wherein as an electrical signal is introduced to the electrical circuit, the FDNR filter is adapted to filter signal blockers out of the electrical signal prior to the electrical signal reaching the amplifier for signal amplification, wherein the FDNR filter does not contribute noise to a signal-to-noise ratio (SNR) of the electrical signal, and wherein a transfer function of the FDNR filter is substantially elliptical in shape.

摘要翻译： 噪声整形和电压增益滤波三阶电路和方法包括至少一对输入电阻器; 位于所述至少一对输入电阻器之间的频率相关负电阻（FDNR）滤波器; 反馈电阻; 以及可操作地连接到所述反馈电阻器和所述至少一对输入电阻器的放大器，其中当电信号被引入所述电路时，所述FDNR滤波器适于在所述电信号之前将所述电信号中的信号阻挡器滤波 到达用于信号放大的放大器，其中FDNR滤波器不对电信号的信噪比（SNR）贡献噪声，并且其中FDNR滤波器的传递函数的形状基本上是椭圆形的。

公开(公告)号：US4132966A

公开(公告)日：1979-01-02

申请号：US825536

申请日：1977-08-18

申请人： Dan Hilberman

发明人： Dan Hilberman

IPC分类号： H03H11/52 ,  H03H5/04

CPC分类号： H03H11/525

摘要： A single amplifier is arranged in an immittance network for simulating a pure frequency dependent negative resistor (FDNR).

公开(公告)号：US20120313428A1

公开(公告)日：2012-12-13

申请号：US13577702

申请日：2010-07-21

申请人： Kenji Kuniyoshi

发明人： Kenji Kuniyoshi

IPC分类号： H04B3/54 ,  H03H7/01

CPC分类号： H04B3/54 ,  H03H11/48 ,  H03H11/525

摘要： The object of the invention is to propose a communication system using an electronic choke circuit which has impedance slightly varied with a load variation and is prevented from having negative resistance and can stabilize circuit operation. A terminal device includes an electronic choke circuit separating DC power supplied from a management device and a communication signal from each other. The electronic choke circuit includes a variable impedance element constituted by a transistor having its collector and its emitter respectively connected to a first terminal and a third terminal, and an inductor and a resistor connected in series with the variable impedance element. A series circuit of a first resistor and a first capacitor is interposed between the first terminal and a second terminal, and the first capacitor has its one end connected to a base of the variable impedance element. A second capacitor is interposed between the third terminal and a fourth terminal. A second resistor suppresses a phenomenon that resistance characteristics of a circuit between an input terminal and an output terminal have a negative resistance region within a frequency band including a frequency of the communication signal.

摘要翻译： 本发明的目的是提出一种使用电阻抗电路的通信系统，该电路具有随负载变化稍微变化的阻抗，并且防止其具有负电阻并且可以稳定电路操作。 终端装置包括分离从管理装置提供的DC电力和彼此的通信信号的电子扼流圈电路。 电子扼流电路包括由其集电极和发射极分别连接到第一端子和第三端子的晶体管构成的可变阻抗元件，以及与可变阻抗元件串联连接的电感器和电阻器。 第一电阻器和第一电容器的串联电路插入在第一端子和第二端子之间，并且第一电容器的一端连接到可变阻抗元件的基极。 第二电容器插在第三端子和第四端子之间。 第二电阻器抑制输入端子和输出端子之间的电路的电阻特性在包括通信信号的频率的频带内具有负电阻区域的现象。

公开(公告)号：US07619472B1

公开(公告)日：2009-11-17

申请号：US12132834

申请日：2008-06-04

申请人： Ahmet Tekin ,  Hassan Elwan ,  Edward Youssoufian

发明人： Ahmet Tekin ,  Hassan Elwan ,  Edward Youssoufian

IPC分类号： H03F3/45

CPC分类号： H03F3/45475 ,  H03F2200/336 ,  H03F2203/45134 ,  H03F2203/45136 ,  H03F2203/45138 ,  H03F2203/45521 ,  H03F2203/45526 ,  H03F2203/45591 ,  H03H11/1291 ,  H03H11/32 ,  H03H11/525

摘要： A fully differential amplifier that amplifies and filters a signal band of a communications channel, the signal band including a desired signal and at least one blocker signal of an adjacent communications channel, the fully differential amplifier includes a fully differential operational amplifier (op-amp) with a common mode feedback, the fully differential operational amplifier amplifying the desired signal, a variable input resistance connected to an input of the fully differential op-amp, and an asymmetric floating frequency dependent negative resistance (AFFDNR) filter connected to the fully differential op-amp between the input and an output of the fully differential op-amp. A plurality of inputs of the fully differential op-amp may be virtually grounded to reduce swings in a voltage. The AFFDNR filter filters the at least one blocker signal and includes a plurality of resistors that implement a high order filtering of the at least one blocker signal.

摘要翻译： 一种全差分放大器，其对通信信道的信号频带进行放大和滤波，所述信号频带包括期望信号和至少一个相邻通信信道的阻塞信号，全差分放大器包括全差分运算放大器（运算放大器） 具有共模反馈，全差分运算放大器放大所需信号，连接到全差分运算放大器的输入的可变输入电阻，以及连接到全差分运算放大器的非对称浮动频率相关负电阻（AFFDNR）滤波器 在全差分运算放大器的输入和输出之间。 全差分运算放大器的多个输入可以实际上接地以减少电压中的摆动。 AFFDNR滤波器对至少一个阻塞信号进行滤波，并且包括实现至少一个阻塞信号的高阶滤波的多个电阻器。

公开(公告)号：US20080297239A1

公开(公告)日：2008-12-04

申请号：US11755125

申请日：2007-05-30

申请人： Hassan Elwan ,  Amr Fahim ,  Edward Youssounan ,  Ahmed A. Emira ,  Dejun Wang

发明人： Hassan Elwan ,  Amr Fahim ,  Edward Youssounan ,  Ahmed A. Emira ,  Dejun Wang

IPC分类号： H03B1/04

CPC分类号： H03H11/10 ,  H03H11/1291 ,  H03H11/525

摘要： A noise shaping and voltage gain filtering third order electrical circuit and method comprises at least one pair of input resistors; a Frequency Dependent Negative Resistance (FDNR) filter positioned in between the at least one pair of input resistors; a feedback resistor; and an amplifier operatively connected to the feedback resistor and the at least one pair of input resistors, wherein as an electrical signal is introduced to the electrical circuit, the FDNR filter is adapted to filter signal blockers out of the electrical signal prior to the electrical signal reaching the amplifier for signal amplification, wherein the FDNR filter does not contribute noise to a signal-to-noise ratio (SNR) of the electrical signal, and wherein a transfer function of the FDNR filter is substantially elliptical in shape.

摘要翻译： 噪声整形和电压增益滤波三阶电路和方法包括至少一对输入电阻器; 位于所述至少一对输入电阻器之间的频率相关负电阻（FDNR）滤波器; 反馈电阻; 以及可操作地连接到所述反馈电阻器和所述至少一对输入电阻器的放大器，其中当电信号被引入所述电路时，所述FDNR滤波器适于在所述电信号之前将所述电信号中的信号阻挡器滤波 到达用于信号放大的放大器，其中FDNR滤波器不对电信号的信噪比（SNR）贡献噪声，并且其中FDNR滤波器的传递函数的形状基本上是椭圆形的。

公开(公告)号：US4686486A

公开(公告)日：1987-08-11

申请号：US751853

申请日：1985-07-05

申请人： Alan J. Greaves ,  Phillip J. Hunter

发明人： Alan J. Greaves ,  Phillip J. Hunter

IPC分类号： H03H11/10 ,  H03H11/52 ,  H03F3/181

CPC分类号： H03H11/10 ,  H03H11/525

摘要： A fourth (or higher) order filter has a series resonant section terminated by a parallel resonant section, both based on frequency dependent negative resistance (FDNR). The FDNR, resistance and capacitance (representing damping) of the series section are provided by a capacitive potential divider (C41,C42) connected between low impedance input (A) to the filter and an intermediate terminal forming the input of a unity-gain amplifier (A4) whose output is connected via a resistance (R4O) to the tapping point of the divider; the intermediate terminal is connected via a second resistance (R1) to the parallel section.

摘要翻译： 第四（或更高）阶滤波器具有由并联谐振部分端接的串联谐振部分，均基于频率依赖负电阻（FDNR）。 串联部分的FDNR，电阻和电容（代表阻尼）由连接到滤波器的低阻抗输入（A）和形成单位增益放大器的输入的中间端子之间的电容分压器（C41，C42）提供 （A4），其输出通过电阻（R4O）连接到分频器的分接点; 中间端子经由第二电阻（R1）连接到并联部分。

公开(公告)号：US4315229A

公开(公告)日：1982-02-09

申请号：US125049

申请日：1980-02-27

申请人： Alan J. Greaves ,  Philip E. Greenaway ,  Charles Nightingale

发明人： Alan J. Greaves ,  Philip E. Greenaway ,  Charles Nightingale

IPC分类号： H03H11/10 ,  H03H11/52 ,  H03H11/04 ,  H03H7/075

CPC分类号： H03H11/10 ,  H03H11/52 ,  H03H11/525

摘要： A filter network that exhibits a bandstop response comprises a network of basically low pass or high pass structure. The network is developed by choosing a bandstop transfer function, a fourth-orderelliptic is disclosed, which is converted to a low pass function. This function describes a passive low pass LC ladder network including a negative impedance element. A Bruton transformation is applied to the passive LC network to give an active version including an ungrounded negative resistance network in a series arm and frequency-dependent negative resistances in shunt arms without requiring inductance coils for its implementation.

摘要翻译： 呈现带阻响应的滤波器网络包括基本上低通或高通结构的网络。 通过选择带阻传递函数来开发网络，公开了第四个椭圆形，将其转换为低通函数。 该功能描述了一个无源低通LC梯形网络，包括负阻抗元件。 将Bruton变换应用于无源LC网络，以提供包括串联臂中的未接地负电阻网络和分流臂中的频率依赖负电阻的有源版本，而不需要用于其实现的电感线圈。

公开(公告)号：US3999154A

公开(公告)日：1976-12-21

申请号：US644281

申请日：1975-12-24

申请人： Charles E. Schmidt

发明人： Charles E. Schmidt

IPC分类号： H03H11/52 ,  H03H7/44

CPC分类号： H03H11/525

摘要： The one-port network here includes a pair of terminals and a single differential-input operational amplifier having an output electrically connected through the parallel combination of a resistor R3 and a capacitor C3 to a first input of the amplifier, through a resistor R4 to a second input of the amplifier, and through the series combination of the resistor R3 and a resistor R5 to one terminal of the network which is electrically connected to a ground reference potential. The second input of the amplifier is also connected to ground through a resistor R6. The first and second inputs of the amplifier are electrically connected through an associated capacitor C1 and resistor R2 to the other terminal of the network. With the capacitances of the two capacitors normalized to values of unity and with the initial constraint that the normalized conductance of the resistor R4 be equal to the sum of the normalized conductances of the resistors R2 and R6, the admittance presented across the network terminals corresponds to that of the parallel combination of an FDNR, a capacitor, and a resistor. With the additional constraint that the product of the normalized conductances of the resistors R3 and R6 be equal to the product of the normalized conductances of the resistors R4 and R5, the impedance presented across the network terminals corresponds to that of the parallel combination of an FDNR and a capacitor. With both the initial constraint and the alternate constraint that the product of the normalized conductances of the resistors R4 and R5 be equal to the sum of the product of the normalized conductances of the resistors R2 and R6 and the product of the normalized conductances of the resistors R3 and R6, the impedance simulated across the network terminals corresponds to that of the parallel combination of an FDNR and a frequency-independent negative resistance. The network impedance is converted to that of an ideal FDNR by connecting a resistor having an appropriate resistance across the network terminals.

公开(公告)号：US3996538A

公开(公告)日：1976-12-07

申请号：US644282

申请日：1975-12-24

申请人： Charles E. Schmidt

发明人： Charles E. Schmidt

IPC分类号： H03H11/52 ,  H03H7/44

CPC分类号： H03H11/525

摘要： The series combination of an FDNR and a resistor is simulated across a pair of terminals of a one-port network which includes a single differential input operational amplifier. One terminal of the network is connected through a first resistor and a second resistor to associated first and second differential inputs of the amplifier. The output of the amplifier is connected through a third resistor to the first input of the amplifier, through the series combination of a first capacitor and a fourth resistor to the second input of the amplifier; and through the series combination of the third resistor and a fifth resistor to the other terminal of the network which is connected to ground. This other terminal is also connected through a second capacitor to the second input of the amplifier. With the capacitances of the capacitors normalized to unity, the product of the normalized resistances of the second and fifth resistors being equal to the product of the normalized resistances of the first and fourth resistors, and the normalized resistances of the third and fifth resistors being the same value, the impedance presented across the one port of the network corresponds to that of an FDNR in series with a resistor.

摘要翻译： 在单端口网络的一对端子上模拟FDNR和电阻器的串联组合，该单端口网络包括单个差分输入运算放大器。 网络的一个端子通过第一电阻器和第二电阻器连接到放大器的相关联的第一和第二差分输入端。 放大器的输出通过第三电阻器连接到放大器的第一输入端，通过第一电容器和第四电阻器的串联组合到放大器的第二输入端; 并且通过第三电阻器和第五电阻器的串联组合到连接到地的网络的另一端子。 该另一端子也通过第二电容器连接到放大器的第二输入端。 在电容器的电容标准化为单位的情况下，第二和第五电阻器的归一化电阻的乘积等于第一和第四电阻器的归一化电阻的乘积，并且第三和第五电阻器的归一化电阻为 相同的值，在网络的一个端口上呈现的阻抗对应于与电阻器串联的FDNR的阻抗。

公开(公告)号：US3990025A

公开(公告)日：1976-11-02

申请号：US644280

申请日：1975-12-24

申请人： Man Shek Lee

发明人： Man Shek Lee

IPC分类号： H03H11/52 ,  H03H7/44

CPC分类号： H03H11/525

摘要： The one-port network here includes a pair of terminals having a resistor R7 electrically connected therebetween, and a differential-input operational amplifier having an output electrically connected through a resistor R3 to a first input of the amplifier and through a resistor R4 to a second input of the amplifier. The first input of the amplifier is connected through a capacitor C5 to one terminal of the network which is electrically connected to a ground reference potential. The second input of the amplifier is also connected to ground through a resistor R6. The first and second inputs of the amplifier are electrically connected through resistor R1 and capacitor C2, respectively, to the other terminal of the network. With the initial constraint that the value of the conductance of the resistor R4 be equal to the product of the capacitance of the capacitor C2 and the conductance of the resistor R3 divided by the capacitance of the capacitor C5, the network simulates the parallel combination of an FDNR, a capacitor, and a resistor across the terminals thereof. Particular other additional relations between values of network elements cause the simulated capacitance and/or the simulated resistance to vanish in order to simulate an FDNR singularly.

摘要翻译： 这里的单端口网络包括一对具有电连接在其间的电阻器R7的端子和差分输入运算放大器，该输出运算放大器的输出通过电阻器R3电连接到放大器的第一输入端并通过电阻器R4连接到第二 放大器的输入。 放大器的第一输入端通过电容器C5连接到电连接到接地参考电位的网络的一个端子。 放大器的第二个输入端也通过一个电阻R6接地。 放大器的第一和第二输入分别通过电阻器R1和电容器C2电连接到网络的另一个端子。 由于电阻器R4的电导值的值等于电容器C2的电容与电阻器R3的电导的乘积除以电容器C5的电容的初始约束，网络模拟了电容器C2的并联组合 FDNR，电容器和其两端的电阻器。 网络元件的值之间的特别其他附加关系导致模拟电容和/或模拟电阻消失，以便单独模拟FDNR。