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1. 发明授权

US10128819B2 High rejection wideband bandpass N-path filter 有权
公开(公告)号：US10128819B2
公开(公告)日：2018-11-13
申请号：US15003417
申请日：2016-01-21
申请人： QUALCOMM Incorporated
发明人： Hajir Hedayati , Milad Darvishi , Jeremy Darren Dunworth , Faramarz Sabouri
IPC分类号： H03H11/08 , H03H11/42 , H03H19/00 , H03H11/40 , H03H11/50
摘要： Certain aspects of the present disclosure provide an N-path filter implemented using a generalized impedance converter (GIC) circuit. The GIC circuit is configured such that the N-path filter has a desired frequency response, which may include a wide passband with steeper rejection than a conventional N-path filter with only a single pole in each filter path. Certain aspects of the present disclosure provide an N-path filter having a frequency response with multiple concurrent passbands. In certain aspects, the N-path filter with multiple passbands is implemented using the GIC circuit. In other aspects, the N-path filter may include a bandpass response circuit where an inductance of the bandpass response circuit may be implemented using gyrators.

2. 发明授权

US08514035B2 RF front-end with on-chip transmitter/receiver isolation using a gyrator 有权
标题翻译：射频前端采用片内发射器/接收器隔离使用回转器
公开(公告)号：US08514035B2
公开(公告)日：2013-08-20
申请号：US12727309
申请日：2010-03-19
申请人： Mohyee Mikhemar , Hooman Darabi
发明人： Mohyee Mikhemar , Hooman Darabi
IPC分类号： H03H11/08 , H04B1/38
CPC分类号： H03H11/42 , H03H11/32 , H03H11/342 , H04B5/0093 , H04B2001/485
摘要： An RF front-end with on-chip transmitter/receiver isolation using a gyrator is presented herein. The RF front end is configured to support full-duplex communication and includes a gyrator and a transformer. The gyrator includes two transistors that are configured to isolate the input of a low-noise amplifier (LNA) from the output of a power amplifier (PA). The gyrator is further configured to isolate the output of the PA from the input of the LNA. The gyrator is at least partially or fully capable of being integrated on silicon-based substrate.
摘要翻译：本文介绍了使用回转器的片内发射机/接收机隔离的RF前端。 RF前端被配置为支持全双工通信，并且包括回转器和变压器。回转器包括被配置为将低噪声放大器（LNA）的输入与功率放大器（PA）的输出隔离的两个晶体管。回转器还被配置为将PA的输出与LNA的输入隔离。回转器至少部分或完全能够集成在硅基基板上。

3. 发明授权

US4510585A Electronic filter 失效
标题翻译：电子滤波器
公开(公告)号：US4510585A
公开(公告)日：1985-04-09
申请号：US199536
申请日：1980-10-22
申请人： Franklin W. Mayo , Miles A. Smither
发明人： Franklin W. Mayo , Miles A. Smither
IPC分类号： H03H11/04 , H03H11/08 , H03H19/00 , G01V1/22 , H03K17/16
CPC分类号： H03H19/008
摘要： An improved duty cycle controlled filter, wherein a resistance is included in every circuit path that exists between a switch terminal and an amplifier terminal. Such improved filter produces low distortion and has been found to be especially useful in data acquisition circuits of seismic exploration systems.
摘要翻译：一种改进的占空比控制滤波器，其中在开关端子和放大器端子之间存在的每个电路路径中包括电阻。这种改进的滤波器产生低失真，并且已经被发现在地震勘探系统的数据采集电路中特别有用。

4. 发明授权

US4015207A Anti-reciprocal network 失效
标题翻译：反互联网
公开(公告)号：US4015207A
公开(公告)日：1977-03-29
申请号：US628591
申请日：1975-11-04
申请人： Johannes Otto Voorman
发明人： Johannes Otto Voorman
IPC分类号： H03H11/08 , H03H11/16 , H03H11/40 , H03H11/42 , H03H11/50 , H03H7/44 , H03H11/00
CPC分类号： H03H11/42
摘要： An anti-reciprocal network including at least a first and a second port each with two terminals, the ports being included in a closed loop which has at least three impedance elements. The network also includes two amplifiers which are coupled to the two ports, wherein each of the amplifiers includes a transistor.
摘要翻译：包括至少第一和第二端口的反互联网络，每个端口都具有两个端子，所述端口包括在具有至少三个阻抗元件的闭环中。网络还包括耦合到两个端口的两个放大器，其中每个放大器包括晶体管。

5. 发明授权

US3895309A Sub networks for filter ladder networks 失效
标题翻译：滤波梯形网络的子网络
公开(公告)号：US3895309A
公开(公告)日：1975-07-15
申请号：US43217674
申请日：1974-01-10
申请人： POST OFFICE
发明人： ROLLETT JOHN MORTIMER , WISE DAVID RICHARD
IPC分类号： H03H11/08 , H03H11/12 , H03F1/36
CPC分类号： H03H11/12
摘要： The invention concerns a subnetwork of a filter circuit which is useful for detecting the dialing tone used in a telephone system. The arrangement employs active devices such as operational amplifiers in circuit with passive resistive and capactive elements to simulate an inductance S. Although it is known to modify a gyrator circuit to produce a 1/s2 function it has hitherto been considered that the use of such simulated functions in a ladder filter network would produce an unstable arrangement. It has been found that the combination of a 1/s2 element in series with a simulated 1/s element is stable and suitable for use in ladder filter networks.
摘要翻译：本发明涉及一种用于检测在电话系统中使用的拨号音的滤波器电路的子网络。该装置采用诸如运算放大器之类的有源器件，具有无源电阻和有源元件的电路以模拟电感S.尽管已知修改回转器电路以产生1 / s2功能，但迄今为止已经认为使用这种模拟梯形滤波器网络中的功能将产生不稳定的布置。已经发现，与模拟1 / s元件串联的1 / s2元件的组合是稳定的并且适用于梯形滤波器网络。

6. 发明授权

US3886469A Filter networks 失效
标题翻译：过滤器网络
公开(公告)号：US3886469A
公开(公告)日：1975-05-27
申请号：US43217474
申请日：1974-01-10
申请人： POST OFFICE
发明人： ROLLETT JOHN MORTIMER , WISE DAVID RICHARD
IPC分类号： H03H11/08 , H03H11/12 , H03F1/36
CPC分类号： H03H11/12
摘要： Filter networks have generally been constructed from passive components in the form of resistor, capacitor and inductors. This invention uses active devices in a subnetwork to simulate inductors and combines the subnetworks to provide the desired filter characteristic such as a Butterworth, Tchebychev or pseudo-elliptic filters which are particularly useful in telephone circuitry for handling the audio tones uses in dialling.

7. 发明授权

US5263192A Integrated resonant circuit with temperature compensated quality factor 失效
标题翻译：具有温度补偿品质因子的集成谐振电路
公开(公告)号：US5263192A
公开(公告)日：1993-11-16
申请号：US863892
申请日：1992-04-06
申请人： James G. Mittel , John J. Parkes, Jr.
发明人： James G. Mittel , John J. Parkes, Jr.
IPC分类号： H03H11/08 , H04B1/26
CPC分类号： H03H11/08
摘要： A filter (13) for providing temperature compensation for the quality factor thereof comprises transconductance amplifiers (23 and 24) in a gyrator configuration coupled between an input node (21) and an output node (22). A parallel capacitor (25) is coupled between the input node (21) and a supply voltage, and a parallel resistor (26) is coupled between the input node (21) and the supply voltage. A series capacitor (27) is coupled to the output node (22), and a series resistor (28) is coupled between the second capacitor (27) and the supply voltage.
摘要翻译：用于为其品质因数提供温度补偿的滤波器（13）包括耦合在输入节点（21）和输出节点（22）之间的回转器配置中的跨导放大器（23和24）。并联电容器（25）耦合在输入节点（21）和电源电压之间，并联电阻器（26）耦合在输入节点（21）和电源电压之间。串联电容器（27）耦合到输出节点（22），串联电阻器（28）耦合在第二电容器（27）和电源电压之间。

8. 发明授权

US4560963A Analog RC active filter 失效
标题翻译：模拟RC有源滤波器
公开(公告)号：US4560963A
公开(公告)日：1985-12-24
申请号：US579830
申请日：1984-02-13
申请人： Robin Sharpe
发明人： Robin Sharpe
IPC分类号： H01L27/01 , H03H11/12 , H03H11/08 , H03H7/06
CPC分类号： H01L27/016 , H03H11/1204
摘要： An RC active filter device which is implemented with integrated circuit technology. Each RC filter element of the device has a distributed series resistance and a distributed shunt capacitance. The series resistance is formed by a strip of resistive material which overlies a resistive plate (or substrate) with an intervening insulating layer to form the shunt capacitance. The filter device can be designed to have a pass-band ripple response which is not affected by variation in nominal absolute resistance and capacitance values resulting from process spreads. These variations only stretch or compress the filter response along the frequency axis. The filter device comprises three RC filter elements and an operational amplifier. The RC filter elements nearest the operational amplifier determine a low pass band, while the input filter element prevents high frequency components outside the low pass band being leaked directly to the filter device output.
摘要翻译：采用集成电路技术实现的RC有源滤波器。器件的每个RC滤波器元件都具有分布式串联电阻和分布式并联电容。串联电阻由电阻材料条形成，该电阻材料覆盖在具有中间绝缘层的电阻板（或衬底）上以形成分流电容。滤波器器件可以被设计为具有通带波纹响应，其不受由工艺扩展产生的标称绝对电阻和电容值的变化的影响。这些变化只能沿着频率轴拉伸或压缩滤波器响应。滤波器装置包括三个RC滤波器元件和运算放大器。最接近运算放大器的RC滤波器元件确定低通带，而输入滤波器元件可防止低通带外的高频分量直接泄漏到滤波器器件输出。

9. 发明授权

US4193033A Quadrature transposition stage 失效
标题翻译：正交转置阶段
公开(公告)号：US4193033A
公开(公告)日：1980-03-11
申请号：US900918
申请日：1978-04-28
申请人： Johannes O. Voorman
发明人： Johannes O. Voorman
IPC分类号： H03C1/60 , H03D3/00 , H03H11/08 , H03H11/34 , H03H11/36 , H03H19/00 , H04L27/02 , H04L27/10 , H04L27/152 , H04L27/22 , H04L27/34 , H04L27/14
CPC分类号： H03D3/00 , H03C1/60 , H03H11/08 , H03H11/34 , H03H11/36 , H03H19/00 , H04L27/1525 , H04L27/22
摘要： Quadrature transposition stage has two signal channels, each containing a filter. A gyrator circuit is coupled between the filters. The result is that the two filters have exactly the same transfer function which reduces signal distortion in such circuits as an FSK demodulator.
摘要翻译：正交转置阶段有两个信号通道，每个信号通道都包含一个滤波器。回转器电路耦合在滤波器之间。结果是两个滤波器具有完全相同的传递函数，这降低了诸如FSK解调器的电路中的信号失真。

10. 发明授权

US4078205A Electronic filter circuit 失效
标题翻译：电子滤波电路
公开(公告)号：US4078205A
公开(公告)日：1978-03-07
申请号：US624806
申请日：1975-11-03
申请人： Michael Marion Van Schoiack
发明人： Michael Marion Van Schoiack
IPC分类号： H03H11/08 , H03H11/12 , H03F1/34
CPC分类号： H03H11/126
摘要： To eliminate the high frequency portion of an input signal while permitting low frequency and DC portions to pass, the electronic filter utilizes an n-1 order active network in combination with a capacitor to generate a shunt current, thereby providing a low pass filter having n-order operating characteristics. Included in the active network is an active element, such as an operational amplifier, which responds to an input signal by creating a voltage across the capacitor, resulting in a shunt current that in turn provides the desired filter characteristics. In certain special cases the n-order active filter can utilize a differentiating element in combination with n-2 order active network along with the capacitor to achieve n-order operating characteristics.
摘要翻译：为了在允许低频和直流部分通过的同时消除输入信号的高频部分，电子滤波器利用与电容器组合的n-1级有源网络来产生并联电流，从而提供具有n个低通滤波器的低通滤波器 - 操作特点。有源网络中包括有源元件，例如运算放大器，其通过在电容器两端产生电压来响应输入信号，导致分流电流，从而提供所需的滤波器特性。在某些特殊情况下，n阶有源滤波器可以与电容器一起利用与n-2阶有源网络结合的微分元件来实现n阶工作特性。

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