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61. 发明授权

US4417220A Adjustable and selective electrical filters and methods of tuning them 失效
标题翻译：可调和选择性电气滤波器及其调谐方法
公开(公告)号：US4417220A
公开(公告)日：1983-11-22
申请号：US232180
申请日：1981-02-06
申请人： Brian T. Holyman , Charlton R. Baty
发明人： Brian T. Holyman , Charlton R. Baty
IPC分类号： H03H11/04 , H03B5/20 , H03H11/12 , H03J7/08 , H03H7/07 , H03B5/26 , H03H7/09
CPC分类号： H03J7/08 , H03B5/20 , H03H11/12 , H03B2200/004
摘要： A notch filter is provided with an ancillary circuit including a non-inverting amplifier and a coupling which enables the filter to form part of an oscillatory loop of which the frequency of oscillation corresponds to the frequency of maximum rejection by the notch filter. Measurement of that frequency facilitates the tuning of the notch filter, which includes capacitors constituted by varactor diodes. The gain of the ancillary circuit may be adjusted to change its mode of operation from oscillation to that of a tuned amplifier so that a sweep of the center frequency of the notch filter through a range of interest facilitates a search for an unknown interfering frequency and the simultaneous tuning of the notch filter to reject that interference.
摘要翻译：陷波滤波器设置有辅助电路，其包括非反相放大器和耦合，其使得滤波器能够形成振荡频率的一部分，其振荡频率对应于陷波滤波器的最大抑制频率。该频率的测量有利于陷波滤波器的调谐，其包括由变容二极管构成的电容器。辅助电路的增益可以被调整以将其操作模式从振荡改变为调谐放大器的工作模式，使得陷波滤波器的中心频率的扫描通过感兴趣的范围有助于搜索未知的干扰频率，并且同步调谐陷波滤波器来抑制干扰。

62. 发明授权

US4223272A Four-terminal network of adjustable transfer function 失效
标题翻译：可调传输功能的四端网络
公开(公告)号：US4223272A
公开(公告)日：1980-09-16
申请号：US954665
申请日：1978-10-25
申请人： Karl H. Feistel
发明人： Karl H. Feistel
IPC分类号： H03H11/12 , H03F1/34
CPC分类号： H03H11/12 , H03H11/1252
摘要： A four-terminal network selectively convertible into a low-pass, high-pass, band-pass, all-pass or band-stop filter comprises three cascaded stages each including an operational amplifier with a grounded noninverting input, the amplifiers of the first two stages being of the integrating type provided with capacitive feedback circuits. Resistive feedback connections extend from a main output A of the third stage to the inverting inputs of the first and third stages and from a relatively inverted output A' of the third stage to the inverting input of the second stage, their respective resistances R.sub.u, R.sub.v, R.sub.w determining the coefficients of the denominator in a biquadratic equation ##EQU1## where H(p) is the transfer function of the network and p=jf/f.sub.n is given by the ratio of an operating frequency f to a reference frequency f.sub.o. The coefficients of the numerator, which could be of either sign and may also be zero, are determined by supply resistances R.sub.a, R.sub.b, R.sub.c connected to the inverting inputs of the several amplifiers, these resistances being switchable to either of two input terminals carrying two relatively inverted signal waves. The feedback capacitances of the first two stages lie in series with respective coupling input resistors of the immediately following stages and determine therewith the reference frequency f.sub.o which can therefore be changed by varying the relative magnitudes of these parameters, either directly or through interposition of adjustable ancillary amplifiers. The supply and feedback resistances may be part of interchangeable modular inserts establishing different signal-transmission modes.
摘要翻译：可选择性地转换成低通，高通，带通，全通或带阻滤波器的四端网络包括三个级联级，每个级联级包括具有接地非反相输入的运算放大器，前两级放大器具有集成型的级提供电容反馈电路。电阻反馈连接从第三级的主输出A延伸到第一和第三级的反相输入以及从第三级的相对反相的输出A'到第二级的反相输入，它们各自的电阻Ru，Rv ，Rw确定二次方程式中的分母系数，其中H（p）是网络的传递函数，p = jf / fn由工作频率f与参考频率fo的比率给出。可以是符号也可以是零的分子的系数由连接到多个放大器的反相输入端的电源电阻Ra，Rb，Rc确定，这些电阻可切换到两个输入端子相对颠倒的信号波。前两级的反馈电容与紧随其后阶段的相应耦合输入电阻串联，并与其一起确定参考频率fo，因此可以通过直接或通过插入可调辅助线来改变这些参数的相对幅度来改变参考频率fo 放大器供应和反馈电阻可以是建立不同信号传输模式的可互换模块插件的一部分。

63. 发明授权

US4185250A Voice frequency RC active filter 失效
标题翻译：语音RC有源滤波器
公开(公告)号：US4185250A
公开(公告)日：1980-01-22
申请号：US902281
申请日：1978-05-03
申请人： John F. Regan
发明人： John F. Regan
IPC分类号： H03H11/04 , H03H11/12 , H03H11/40 , H03F3/181
CPC分类号： H03H11/12 , H03H11/0416 , H03H11/40
摘要： A voice-frequency RC-active filter comprising a plurality of resistors and generalized impedance converter networks for synthesizing the frequency response of a preselected LC filter. Each generalized impedance converter network includes a pair of operational amplifiers and a plurality of impedances Z1, Z2, Z3, Z4 and Z5 interconnected with the amplifiers to provide the network with a driving point impedance ##EQU1## in which at least one of the impedances in both the numerator and the denominator of Zi includes a film-type resistor. At least one of the film-type resistors included in the impedances Z1, Z2, Z3, Z4 and Z5 is functionally trimmed to tune the filter. The capacitors in the filter are preferably discrete polycarbonate capacitors with a capacitance tolerance of .+-.5%, and all having the same value.
摘要翻译：一种语音频率RC有源滤波器，包括多个电阻器和用于合成预选LC滤波器的频率响应的广义阻抗转换器网络。每个广义阻抗转换器网络包括一对运算放大器和与放大器互连的多个阻抗Z1，Z2，Z3，Z4和Z5，以向网络提供驱动点阻抗“IMAGE”，其中至少一个阻抗 Zi的分子和分母都包括膜型电阻。包括在阻抗Z1，Z2，Z3，Z4和Z5中的膜型电阻器中的至少一个被功能地修整以调谐滤波器。滤波器中的电容器最好是电容容差为+/- 5％的离散聚碳酸酯电容器，并且都具有相同的值。

64. 发明授权

US3603903A Linear active network device for transforming one class nonlinear devices into another 失效
标题翻译：用于将一类非线性器件转换为另一种的线性有源网络器件
公开(公告)号：US3603903A
公开(公告)日：1971-09-07
申请号：US3603903D
申请日：1968-05-27
申请人： PURDUE RESEARCH FOUNDATION
发明人： CHUA LEON O
IPC分类号： H03H11/02 , H03H11/12 , H03H7/00 , H03H11/00
CPC分类号： H03H11/12 , H03H11/02
摘要： A linear active two-port network element for synthesizing nonlinear network components with arbitrarily prescribed characteristics. The elements, by themselves or in combination, can be utilized for a variety of applications, and are particularly useful in integrated circuit technology. The element included herein is the Mutator. The Mutator essentially transforms, or mutates one class of nonlinear devices into another; for example, a nonlinear resistor may be changed to a nonlinear inductor, a nonlinear inductor to a nonlinear capacitor, a nonlinear capacitor to a nonlinear resistor, and so on.

65. 发明授权

US3525949A Active rc-filter of a desired degree 失效
标题翻译：主要RC-FILTER OF A DESIRED DEGREE
公开(公告)号：US3525949A
公开(公告)日：1970-08-25
申请号：US3525949D
申请日：1968-04-22
申请人： ERICSSON TELEFON AB L M
发明人： FJALLBRANT TORE TORSTENSSON
IPC分类号： H03H11/12 , H03F1/36
CPC分类号： H03H11/12

66. 发明授权

US2978656A Interference filter 失效
标题翻译：干扰滤波器
公开(公告)号：US2978656A
公开(公告)日：1961-04-04
申请号：US40638054
申请日：1954-01-26
申请人： WILCOX JR DWIGHT D
发明人： WILCOX JR DWIGHT D
IPC分类号： H03H11/12
CPC分类号： H03H11/12

67. 发明授权

US2668882A Amplifier 失效
公开(公告)号：US2668882A
公开(公告)日：1954-02-09
申请号：US15323950
申请日：1950-03-31
申请人： MONTFORD MORRISON
发明人： MONTFORD MORRISON
IPC分类号： H03H11/12
CPC分类号： H03H11/12

68. 发明授权

US2629025A High gain selective signal amplifier system 失效
标题翻译：高增益选择信号放大器系统
公开(公告)号：US2629025A
公开(公告)日：1953-02-17
申请号：US9029249
申请日：1949-04-29
申请人： RCA CORP
发明人： ROBERTS WALTER VAN B
IPC分类号： H03H11/12 , H04B1/16
CPC分类号： H04B1/1638 , H03H11/12

69. 发明授权

US2605358A Low pass filter 失效
标题翻译：低通滤波器
公开(公告)号：US2605358A
公开(公告)日：1952-07-29
申请号：US64439246
申请日：1946-01-30
申请人： NEHER LELAND K
发明人： NEHER LELAND K
IPC分类号： H03F3/52 , H03H11/12
CPC分类号： H03F3/52 , H03H11/12

70. 发明授权

US2546918A Rate smoothing network 失效
标题翻译：速率平滑网络
公开(公告)号：US2546918A
公开(公告)日：1951-03-27
申请号：US56577844
申请日：1944-11-29
申请人： RCA CORP
发明人： HARRY BRANSON
IPC分类号： H03H11/12
CPC分类号： H03H11/12

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