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1. 发明授权

US10382003B2 Digital switched attenuator 有权
公开(公告)号：US10382003B2
公开(公告)日：2019-08-13
申请号：US16225048
申请日：2018-12-19
申请人： SKYWORKS SOLUTIONS, INC.
发明人： Adrian John Bergsma
IPC分类号： H03H7/25 , H03H7/07
摘要： An attenuation cell is provided for use in a switched attenuator. The attenuation cell includes an attenuation path that has an input, a first switch, a resistive network, a second switch, and an output. The resistive network provides a desired attenuation from the input to the output. The attenuation cell also includes a bypass path in parallel with the attenuation path with a bypass switch between the input and the output. The attenuation cell also has a shunt switch coupled between the resistive network and a reference node to selectively connect the resistive network to the reference node.

2. 发明授权

US5331299A Adaptive tracking notch filter system 失效
标题翻译：自适应跟踪陷波滤波系统
公开(公告)号：US5331299A
公开(公告)日：1994-07-19
申请号：US483930
申请日：1990-02-23
申请人： Norval P. Smith
发明人： Norval P. Smith
IPC分类号： H03H7/07 , H03H11/04 , H03H7/01 , H03H17/02
CPC分类号： H03H7/07 , H03H11/04
摘要： An automatic tracking notch filter system tracks a large-magnitude narrow band signal through frequency effectively eliminating it. A frequency variable notch filter is responsive to a control input at which is applied a small amplitude AC dither signal. The resulting fluctuation in frequency of the notch filter causes corresponding fluctuations in the magnitude of the notch filter output. The output signal is rectified and band pass filtered around the dither frequency before being demodulated with the dither signal to provide a DC error signal indicating the magnitude and direction in frequency of the filter misalignment. The error signal is integrated and input to the control input of the notch filter with the dither signal such that the notch filter tracks the narrow band signal in response to the feedback signal provided at its control input.
摘要翻译：自动跟踪陷波滤波器系统通过频率跟踪大幅度窄带信号，有效消除它。频率可变陷波滤波器响应于施加小振幅AC抖动信号的控制输入。所产生的陷波滤波器的频率波动引起陷波滤波器输出幅度的相应波动。在抖动信号解调之前，输出信号被整流并且在抖动频率周围进行带通滤波，以提供指示滤波器未对准频率的幅度和方向的DC误差信号。误差信号被积分并且输入到具有抖动信号的陷波滤波器的控制输入，使得陷波滤波器响应于在其控制输入处提供的反馈信号来跟踪窄带信号。

3. 发明授权

US5294898A Wide bandwidth bandpass filter comprising parallel connected piezoelectric resonators 失效
标题翻译：宽带宽带通滤波器包括并联的压电谐振器
公开(公告)号：US5294898A
公开(公告)日：1994-03-15
申请号：US827311
申请日：1992-01-29
申请人： Lawrence Dworsky , Luke C. Bor Mang
发明人： Lawrence Dworsky , Luke C. Bor Mang
IPC分类号： H03H7/07 , H03H9/25 , H03H9/54 , H03H9/58
CPC分类号： H03H9/542 , H03H9/25 , H03H9/585 , H03H7/1708
摘要： A plurality of piezoelectric resonators (10,32,37,57,62,66,79,88,93) are utilized to form a bandpass filter (31,56,78). The resonators (10,32,37,57,62,66,79,88,93) are connected in parallel to form a plurality of parallel paths between an input (43,73,81) and an output (47,74,82) of the filter (31,56,78). A predetermined number of the piezoelectric resonators (10,32,37,57,62,66,79,88,93) provide a phase shift of approximately 180 degrees. Each parallel path has a passband and center frequency that is displaced from the passband and center frequency of other paths. Consequently, the passband of each parallel path algebraically sums and creates a filter passband that is wider than the passband of each of the filter's individual parallel paths.
摘要翻译：多个压电谐振器（10,32,37,57,62,66,79,88,93）用于形成带通滤波器（31,56,78）。谐振器（10,32,37,57,62,66,79,88,93）并联连接以在输入（43,43,81）和输出（47,74）之间形成多条平行路径， 82）过滤器（31,56,78）。预定数量的压电谐振器（10,32,37,57,62,66,79,88,93）提供大约180度的相移。每个并行路径具有从其他路径的通带和中心频率偏移的通带和中心频率。因此，每个并行路径的通带代数求和并产生比每个滤波器的各个并行路径的通带宽的滤波器通带。

4. 发明授权

US2520177A Variable rejection filter 失效
标题翻译：可变抑制滤波器
公开(公告)号：US2520177A
公开(公告)日：1950-08-29
申请号：US64205746
申请日：1946-01-18
申请人： STOOPS CHESTER W
发明人： STOOPS CHESTER W
IPC分类号： G05B11/01 , H03H7/07
CPC分类号： H03H7/07 , G05B11/013 , H03H7/1725

5. 发明授权

US1977751A Wave transmission network 失效
公开(公告)号：US1977751A
公开(公告)日：1934-10-23
申请号：US66159333
申请日：1933-03-18
申请人： AMERICAN TELEPHONE & TELEGRAPH
发明人： JULIUS ZOBEL OTTO
IPC分类号： H03H7/07 , H03H7/09
CPC分类号： H03H7/1708 , H03H7/07 , H03H7/09 , H03H7/1766

6. 发明授权

US10097153B1 Bridge-T reflectionless bandstop filter 有权
公开(公告)号：US10097153B1
公开(公告)日：2018-10-09
申请号：US15455299
申请日：2017-03-10
申请人： SPAWAR Systems Center Pacific
发明人： Jason F. Rowland , Jia-Chi S. Chieh
IPC分类号： H03H7/12 , H03H7/01 , H03H7/07
摘要： A bandstop filter is provided that includes an input port, a series bandpass resonator, a first capacitor, a bandstop resonator, a second capacitor and an output port. The combination of the first capacitor, the bandstop resonator and the second capacitor comprises a bandstop impedance magnitude and a bandstop impedance phase. The bandpass resonator impedance magnitude is substantially equal to the bandstop impedance magnitude. The bandpass resonator impedance phase is substantially 180° out of phase with the bandstop impedance phase. The series bandpass resonator, the first capacitor, the bandstop resonator and the second capacitor operate as a band stop for a predetermined frequency within the frequency band.

7. 发明授权

US06867665B2 Filters implemented in integrated circuits 有权
标题翻译：集成电路中实现的滤波器
公开(公告)号：US06867665B2
公开(公告)日：2005-03-15
申请号：US09934339
申请日：2001-08-21
申请人： Tajinder Manku , Bish Ray
发明人： Tajinder Manku , Bish Ray
IPC分类号： H01F10/00 , H01F19/04 , H01L27/00 , H01P1/20 , H03H7/07 , H03H11/04 , H03H7/00
CPC分类号： H03H7/07
摘要： An integrated RF filter for use at microwave frequencies comprising: an integrated circuit inductor with connected integrated circuit capacitors, arranged as a tank circuit, and an integrated circuit shunt resistor; the inductor, capacitors and resistor being interconnected in a bridge-T filter arrangement.
摘要翻译：一种用于微波频率的集成RF滤波器，包括：具有连接的集成电路电容器的集成电路电感器，布置为储能电路，以及集成电路分流电阻器; 电感器，电容器和电阻器以桥式T滤波器布置互连。

8. 发明授权

US5453721A Attenuator 失效
标题翻译：衰减器
公开(公告)号：US5453721A
公开(公告)日：1995-09-26
申请号：US257603
申请日：1994-06-09
申请人： Scott R. Geiger , Mark G. Obermann
发明人： Scott R. Geiger , Mark G. Obermann
IPC分类号： H03H7/07 , H03H7/24
CPC分类号： H03H7/0123 , H03H7/07
摘要： An electrical circuit (200) having an input terminal (201), an output terminal (202), and a signal common (203) is preferably used to attenuate an electrical signal. The electrical circuit (200) comprises four impedance elements (205-208) and an impedance transformer (210). A first impedance element (205) is coupled between the input terminal (201) and a first node (212), while a second impedance element (206) is coupled between the first node (212) and the output terminal (202). A third impedance element (207) is coupled between the input terminal (201) and the output terminal (202), while a fourth impedance element (208) is coupled between a second node (213) and the signal common (203). The impedance transformer (210) is coupled between the first node (212) and the second node (213) to complete the electrical circuit (200).
摘要翻译：具有输入端（201），输出端（202）和信号共用（203）的电路（200）优选用于衰减电信号。电路（200）包括四个阻抗元件（205-208）和阻抗变压器（210）。第一阻抗元件（205）耦合在输入端（201）和第一节点（212）之间，而第二阻抗元件（206）耦合在第一节点（212）和输出端（202）之间。第三阻抗元件（207）耦合在输入端（201）和输出端（202）之间，而第四阻抗元件（208）耦合在第二节点（213）和信号公共端（203）之间。阻抗变换器（210）耦合在第一节点（212）和第二节点（213）之间以完成电路（200）。

9. 发明授权

US5202651A Band-stop filter circuit suitably made into monolithic microwave integrated circuits 失效
标题翻译：带阻滤波器电路适用于单片微波集成电路
公开(公告)号：US5202651A
公开(公告)日：1993-04-13
申请号：US813369
申请日：1991-12-24
申请人： Toshihiko Yoshimasu
发明人： Toshihiko Yoshimasu
IPC分类号： H01P1/20 , H01P1/203 , H03H7/07
CPC分类号： H03H7/0123 , H03H7/1708
摘要： An image band-stop filter circuit includes a transmission line formed on a substrate of GaAs and a T circuit connected in parallel to the transmission line and having a high pass filter characteristic. The T circuit includes series-connected first and second capacitances connected in parallel to the transmission line and a stub having one end connected to a node between the first and second capacitances and the other end short-circuited. The stub has a line length which becomes inductive in an image signal band to be removed. As a result, the lengths of the transmission line and the stub can be reduced to enable the band-stop filter circuit to be made into a MMIC with ease while achieving an excellent signal transmission characteristic.
摘要翻译：图像带阻滤波器电路包括形成在GaAs衬底上的传输线和与传输线并联连接并具有高通滤波器特性的T电路。 T电路包括与传输线并联连接的串联连接的第一和第二电容，以及一端连接到第一和第二电容之间的节点，另一端短路的短截线。短截线具有在要除去的图像信号频带中变得感性的线长度。结果，可以减少传输线和短截线的长度，使带通滤波器电路能够容易地制成MMIC，同时实现优异的信号传输特性。

10. 发明授权

US4007434A Notch filter 失效
标题翻译：凹陷过滤器
公开(公告)号：US4007434A
公开(公告)日：1977-02-08
申请号：US676957
申请日：1976-04-14
申请人： James C. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Fletcher , Glenn B. Shelton
发明人： James C. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Fletcher , Glenn B. Shelton
IPC分类号： H03H1/00 , H03H7/07 , H03H7/10 , H03H7/14 , H03H13/00
CPC分类号： H03H1/00 , H03H7/07 , H03H7/1708
摘要： A notch filter for the selective attenuation of a narrow band of frequencies out of a larger band wherein a helical resonator is connected to an input circuit and an output circuit through discrete and equal capacitors, and a resistor is connected between the input and the output circuits.
摘要翻译：一种陷波滤波器，用于选择性地衰减较大频带的窄频带，其中螺旋谐振器通过离散和相等的电容器连接到输入电路和输出电路，并且电阻器连接在输入和输出电路之间。

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