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1. 发明授权

US3568007A Filter and substitute for resonant reed relay 失效
标题翻译：过滤器和替代继电器继电器
公开(公告)号：US3568007A
公开(公告)日：1971-03-02
申请号：US3568007D
申请日：1969-01-21
申请人： JESSE H MINER
发明人： MINER JESSE H
IPC分类号： H03D3/04 , H03G11/06 , H03H11/12 , H03K9/06 , H01H47/32
CPC分类号： H03H11/1213 , H03D3/04 , H03G11/06 , H03H11/1208 , H03K9/06
摘要： A monostable multivibrator is connected to a differential amplifier to perform the following functions: signal limiter, band-pass filter, low-pass filter, high-pass filter and frequency modulation detector.

2. 发明授权

US3170120A Active comb filter 失效
标题翻译：主动梳状滤波器
公开(公告)号：US3170120A
公开(公告)日：1965-02-16
申请号：US5814660
申请日：1960-09-23
申请人： JENSEN GAROLD K , MCGEOGH JAMES E
发明人： JENSEN GAROLD K , MCGEOGH JAMES E
IPC分类号： G01S13/52 , G01S13/526 , G01S13/53 , H03H9/54 , H03H11/04
CPC分类号： H03H11/04 , G01S13/52 , G01S13/526 , G01S13/53 , H03H9/545 , H03H11/1208

3. 发明申请

US20180323770A1 VARIABLE FILTER 审中-公开
公开(公告)号：US20180323770A1
公开(公告)日：2018-11-08
申请号：US16031911
申请日：2018-07-10
申请人： Anlotek Limited
发明人： Jorgen Staal Nielsen , Richard Nichols
IPC分类号： H03H11/12 , H03G3/30
CPC分类号： H03H11/1208 , H03G3/3042 , H03H11/1291 , H03H2210/012 , H03H2210/015
摘要： A variable filter has a signal loop defined between a signal input and a signal output. A plurality of circuit elements connected in the signal loop, the plurality of circuit elements comprising a frequency tunable resonator, and an adjustable scaling block that applies a gain factor that is adjustable in a range that comprises a positive gain and a negative gain. A controller is connected to 1) tune the frequency tunable resonator; and to 2) adjust the gain factor of the adjustable scaling block between a negative gain factor to a positive gain factor providing for variable Q independent of frequency.

4. 发明授权

US3754192A Electromechanical frequency selective devices 失效
标题翻译：机电频率选择器件
公开(公告)号：US3754192A
公开(公告)日：1973-08-21
申请号：US3754192D
申请日：1972-01-05
申请人： PHILIPS CORP
发明人： PALFREEMAN J
IPC分类号： H03H9/02 , H03H9/64 , H03H9/72 , H03F3/04
CPC分类号： H03H9/76 , H03H9/6403 , H03H11/1208
摘要： Electromechanical frequency selective filters are disclosed wherein a wafer of piezoelectric material converts an electric input signal into a surface wave by means of an input transducer comprising electrodes of conductive material on the surface of the wafer. The surface wave is converted into an electric output signal by means of an output transducer comprising two combshaped interdigital electrodes made of conductive material and arranged on the same surface of the wafer of piezoelectric material. Either or both of the transducers are split into a plurality of sub-electrodes which are electrically insulated from one another. Signals produced at output transducer sub-electrodes are separately applied to associated unidirectional amplifiers whose outputs are combined to obtain a desired overall output signal.
摘要翻译：公开了机电频率选择滤波器，其中压电材料晶片通过包括晶片表面上的导电材料电极的输入换能器将电输入信号转换成表面波。表面波通过包括由导电材料制成的两个梳形叉指电极的输出换能器转换成电输出信号，并布置在压电材料晶片的同一表面上。换能器中的任一个或两个被分成彼此电绝缘的多个子电极。在输出变换器子电极处产生的信号分别应用于相关联的单向放大器，其输出被组合以获得期望的总输出信号。

5. 发明授权

US3221265A Crystal filter circuits 失效
标题翻译：晶体滤波电路
公开(公告)号：US3221265A
公开(公告)日：1965-11-30
申请号：US21736462
申请日：1962-08-16
申请人： SECR AVIATION
发明人： SYDNEY CHESTER ALAN
IPC分类号： H03H11/12
CPC分类号： H03H11/1208 , H03H11/1213

6. 发明申请

US20190013789A1 VARIABLE-FREQUENCY LC FILTER, HIGH-FREQUENCY FRONTEND MODULE, AND COMMUNICATION APPARATUS 审中-公开
公开(公告)号：US20190013789A1
公开(公告)日：2019-01-10
申请号：US16130224
申请日：2018-09-13
申请人： Murata Manufacturing Co., Ltd.
发明人： Hirotsugu Mori
IPC分类号： H03H7/01 , H03H7/12 , H03H11/12
CPC分类号： H03H7/0115 , H03H7/0153 , H03H7/075 , H03H7/09 , H03H7/12 , H03H7/175 , H03H7/1758 , H03H7/1766 , H03H7/1775 , H03H7/1791 , H03H11/1208
摘要： A variable-frequency LC filter that has sharp attenuation characteristics and that does not increase the size of a substrate and a high-frequency frontend module using such a variable-frequency LC filter are provided. A first variable capacitor and a second variable capacitor are disposed on a principal surface such that strength of magnetic field coupling caused between a first inductor and a third inductor is greater than strength of magnetic field coupling caused between a second inductor and the first inductor and than strength of magnetic field coupling caused between the second inductor and the third inductor.

7. 发明申请

US20170149411A1 VARIABLE FILTER 审中-公开
公开(公告)号：US20170149411A1
公开(公告)日：2017-05-25
申请号：US15360813
申请日：2016-11-23
申请人： Anlotek Limited
发明人： Jorgen Staal Nielsen , Richard Nichols
IPC分类号： H03H11/12 , H03G3/30
CPC分类号： H03H11/1208 , H03G3/3042 , H03H11/1291 , H03H2210/012 , H03H2210/015
摘要： A variable filter has a signal loop defined between a signal input and a signal output. A plurality of circuit elements connected in the signal loop, the plurality of circuit elements comprising a frequency tunable resonator, and an adjustable scaling block that applies a gain factor that is adjustable in a range that comprises a positive gain and a negative gain. A controller is connected to 1) tune the frequency tunable resonator; and to 2) adjust the gain factor of the adjustable scaling block between a negative gain factor to a positive gain factor providing for variable Q independent of frequency.

8. 发明授权

US5543756A Combined crystal and LC filter 失效
标题翻译：组合晶体和LC滤光片
公开(公告)号：US5543756A
公开(公告)日：1996-08-06
申请号：US442715
申请日：1995-05-12
申请人： Thomas H. Anderson
发明人： Thomas H. Anderson
IPC分类号： H03H11/04 , H03H11/12 , H03H9/00
CPC分类号： H03H11/1208
摘要： A circuit for an intermediate frequency filter combines a variable bandwidth series resonant filter circuit and a parallel resonant filter circuit. A variable output impedance drives the filter and a variable input impedance amplifier buffers the output of the filter. The output impedance of the driver is made to track the input impedance of the output buffer. Changes in the gain of the filter with respect to bandwidth are relatively small. The noise figure of the filter remains low. The circuit is not operated in the non-linear region of the crystal because relatively low drive currents are needed at narrow bandwidths so that the crystal is not overdriven. The LC filter tunes out the stray capacitance from the load of the crystal filter.
摘要翻译：用于中频滤波器的电路组合可变带宽串联谐振滤波器电路和并联谐振滤波器电路。可变输出阻抗驱动滤波器，可变输入阻抗放大器缓冲滤波器的输出。使驱动器的输出阻抗跟踪输出缓冲器的输入阻抗。滤波器相对于带宽的增益的变化相对较小。滤波器的噪声系数保持不变。该电路不工作在晶体的非线性区域，因为在窄带宽下需要较低的驱动电流，因此晶体不会过载。 LC滤波器从晶体滤波器的负载调整寄生电容。

9. 发明授权

US5530391A Filter circuit with a resonator operated in series resonance 失效
标题翻译：具有谐振器的串联谐振器的滤波电路
公开(公告)号：US5530391A
公开(公告)日：1996-06-25
申请号：US204492
申请日：1994-03-02
申请人： Rolf Bohme , Johann Burkhart , Johann Traub , Konrad Hirsch
发明人： Rolf Bohme , Johann Burkhart , Johann Traub , Konrad Hirsch
IPC分类号： H03H11/04 , H03H9/54 , H03H11/12
CPC分类号： H03H11/1208
摘要： A filter that has a resonator operated in series resonance and a two-pole terminal resonator circuit with a resonator whose electric conductance can be divided into a useful component and a parasitic component. A first differential stage actuated by a signal source and having two active elements whose ground connections are each linked to a respective current source and to a respective connection of the two-terminal resonator. A compensation circuit having two connections and which simulates the parasitic component of the resonator electric conductance is connected to a second differential stage which actuated by the signal source, is of the same type as the first differential stage, and has two active elements whose ground connections are each linked to a respective current source and to a respective connection of the compensation circuit. An evaluation circuit is linked to the two mutually reversed, i.e. connected in phase opposition, output connections of the two differential stages.
摘要翻译：具有以串联谐振器工作的谐振器的滤波器和具有谐振器的双极端子谐振器电路，该谐振器的电导率可分为有用分量和寄生分量。由信号源致动并具有两个有源元件的第一差分级，其接地连接各自连接到相应的电流源和两端谐振器的相应连接。具有两个连接并且模拟谐振器电导的寄生分量的补偿电路连接到由信号源致动的第二差分级，其具有与第一差分级相同的类型，并且具有两个有源元件，其接地连接各自连接到相应的电流源和补偿电路的相应连接。评估电路与两个差分级的两个相互反向的，即相位相反的输出连接相连。

10. 发明授权

US08686788B2 Filter circuit 有权
标题翻译：滤波电路
公开(公告)号：US08686788B2
公开(公告)日：2014-04-01
申请号：US13387117
申请日：2009-06-26
申请人： Ivan Stefanov Uzunov , Peter Borissov Statev , Buen Dimov Boyanov , Rumen Mihajlov Bradvarov
发明人： Ivan Stefanov Uzunov , Peter Borissov Statev , Buen Dimov Boyanov , Rumen Mihajlov Bradvarov
IPC分类号： H03K5/00
CPC分类号： H03H9/545 , H03H11/1208
摘要： A circuit and method for filtering a signal. An amplifier receives an input signal and generates a differential output signal. A first resonator having series and parallel resonant frequencies is connected to the positive output port of the amplifier. A second resonator having series and parallel resonant frequencies is connected to the negative output port of the amplifier. The first and second resonators are coupled at a connection point. A buffering device receives the combined outputs of the resonators and outputs a filtered signal. The filtering method receives signals and passes them through the elements of the filter circuit to generate a filtered output signal.
摘要翻译：一种用于过滤信号的电路和方法。放大器接收输入信号并产生差分输出信号。具有串联和并联谐振频率的第一谐振器连接到放大器的正输出端口。具有串联和并联谐振频率的第二谐振器连接到放大器的负输出端口。第一和第二谐振器在连接点处耦合。缓冲装置接收谐振器的组合输出并输出滤波信号。滤波方法接收信号并将其通过滤波器电路的元件，以产生滤波后的输出信号。

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