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公开(公告)号：US20090322310A1
公开(公告)日：2009-12-31
申请号：US12399182
申请日：2009-03-06
申请人： Mark Whittington , Zaher G. Harb
发明人： Mark Whittington , Zaher G. Harb
IPC分类号： G01R35/04
CPC分类号： G01R35/002 , H03H7/24 , H03H7/40 , H03H11/30
摘要： Various embodiments of a self-calibration circuit may solve the problem that arises in high performance oscilloscopes and in particular, RF oscilloscopes, of internally providing a precision calibration signal without degrading the bandwidth, flatness of the frequency response, and input return loss of the oscilloscope. The self-calibration circuit may be configured to implement an impedance transformation technique where active and passive circuit elements with carefully chosen values are configured in an impedance converter. During self-calibration, switching elements comprised in the self-calibration circuit may be toggled to create a servo loop comprising an amplifier within the circuit, with an attenuator and resistive component acting as feedback elements. The circuit may hence become an impedance gyrator and behave as a precision source with an impedance matching the input impedance of the load circuit.
摘要翻译： 自校准电路的各种实施例可以解决在高性能示波器，特别是RF示波器中出现的内部提供精密校准信号而不降低带宽，频率响应的平坦度和输入示波器的回波损耗的问题 。 自校准电路可以被配置为实现阻抗变换技术，其中具有仔细选择的值的有源和无源电路元件被配置在阻抗转换器中。 在自校准期间，包括在自校准电路中的开关元件可以被切换以产生包括电路内的放大器的伺服回路，其中衰减器和电阻元件用作反馈元件。 因此，电路可能成为阻抗回旋器，并且作为具有与负载电路的输入阻抗匹配的阻抗的精度源。
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公开(公告)号：US07640001B2
公开(公告)日：2009-12-29
申请号：US11316301
申请日：2005-12-20
CPC分类号： H03G1/0088 , H03G5/16 , H03H7/24
摘要： A system for filtering a signal includes a plurality of filter modules coupled in series. Each filter module includes a filter and a variable gain element. Each filter is capable of. receiving an input signal, attenuating a portion of the input signal that is outside a passband associated with the filter, and outputting at least a portion of the input signal that is within the passband associated with the filter. Each variable gain element is capable of receiving a control signal and inducing a gain in an output of the filter based on the control signal.
摘要翻译： 用于滤波信号的系统包括串联耦合的多个滤波器模块。 每个滤波器模块包括滤波器和可变增益元件。 每个过滤器都有。 接收输入信号，衰减与滤波器相关联的通带外部的输入信号的一部分，以及输出与滤波器相关联的通带内的输入信号的至少一部分。 每个可变增益元件能够基于控制信号接收控制信号并且在滤波器的输出中引起增益。
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公开(公告)号：US07619502B2
公开(公告)日：2009-11-17
申请号：US11167893
申请日：2005-06-27
IPC分类号： H01C3/20
CPC分类号： H03H7/24
摘要： A potentiometer network includes a first main terminal, a second main terminal, a plurality of resistive elements connected in parallel between the first main terminal and the second main terminal, and means for embedding calibration of said resistive elements in said potentiometer network.
摘要翻译： 电位计网络包括第一主端子，第二主端子，并联连接在第一主端子和第二主端子之间的多个电阻元件，以及用于将所述电阻元件校准嵌入所述电位计网络中的装置。
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公开(公告)号：US20090231069A1
公开(公告)日：2009-09-17
申请号：US12049845
申请日：2008-03-17
申请人： Eric M. Mullen , Mark Whittington
发明人： Eric M. Mullen , Mark Whittington
IPC分类号： H01P1/22
CPC分类号： H03H7/24 , G01R13/0272
摘要： An attenuator circuit. The attenuator circuit includes a resistive divider coupled to a capacitive network including first and second capacitive dividers. The resistive divider is configured to perform an N:1 attenuation of a signal in a low frequency range. The first and second capacitive dividers are configured to perform an N:1 attenuation in the high frequency range that is a product of the attenuation provided by each (e.g., each performing an M:1 attenuation, where N=M×M, with the total attenuation of the capacitive dividers being N:1 where N=M×M). A variable capacitance divider is coupled in parallel with the second capacitive divider, and includes first and second variable capacitors that, when adjusted, change the high frequency attenuation of the attenuator circuit to match the value of the high frequency attenuation to that of the low frequency attenuation.
摘要翻译： 衰减器电路。 衰减器电路包括耦合到包括第一和第二电容分压器的电容网络的电阻分压器。 电阻分压器被配置为执行低频范围内的信号的N：1衰减。 第一和第二电容分配器被配置为在高频范围内执行N衰减，其是由每个衰减提供的衰减的乘积（例如，每个执行M = 1衰减，其中N = M×M，与总衰减 的电容分压器为N：1，其中N = MxM）。 可变电容分压器与第二电容分压器并联耦合，并且包括第一和第二可变电容器，其在调节时改变衰减器电路的高频衰减，以将高频衰减的值与低频衰减器的值相匹配 衰减。
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公开(公告)号：US20090085579A1
公开(公告)日：2009-04-02
申请号：US11864894
申请日：2007-09-28
CPC分类号： H03H7/24
摘要： There is provided an attenuation apparatus for attenuating a signal received via a first terminal thereof and outputting the attenuated signal via a second terminal thereof. The attenuation apparatus includes a first transmission path and a second transmission path which respectively have different attenuation amounts for the signal, a connection switching section that switches, between the first and second transmission paths, a transmission path connected to the first and second terminals so as to be positioned therebetween, and a first ground connection switching section that connects, to a reference potential, respective ends of the first transmission path and a contact point positioned on a path between the respective ends of the first transmission path, when the second transmission path is electrically connected to the first and second terminals so as to be positioned therebetween.
摘要翻译： 提供了一种用于衰减经由其第一端接收的信号并经由其第二端输出衰减信号的衰减装置。 衰减装置包括分别具有不同衰减量的第一传输路径和第二传输路径，连接切换部分，在第一和第二传输路径之间切换连接到第一和第二终端的传输路径，以便 以及第一接地连接切换部，其将第一传输路径的各个端部和位于第一传输路径的各端部之间的路径上的接触点的基准电位连接到第二传输路径 电连接到第一端子和第二端子以便位于它们之间。
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公开(公告)号：US20090072931A1
公开(公告)日：2009-03-19
申请号：US11876482
申请日：2007-10-22
申请人： Hon Kin Chiu
发明人： Hon Kin Chiu
IPC分类号： H01P1/22
CPC分类号： H03H7/24
摘要： An integrated digitally controlled linear-in-decibels attenuator circuit in which one or more sets of selection switches establish a desired attenuation by selectively connecting the input signal electrode to one or more corresponding resistive ladder networks connected in series, thereby providing a substantially more constant signal attenuation value over a wider frequency bandwidth. With a single resistive ladder network, attenuation control is achieved using a thermometer switching code. With multiple resistive ladder networks, coarse and fine attenuation control can be achieved using thermometer and bubble switching codes, respectively.
摘要翻译： 一种集成的数字控制线性分贝衰减器电路，其中一组或多组选择开关通过选择性地将输入信号电极连接到串联连接的一个或多个相应的电阻梯形网络来建立期望的衰减，从而提供基本上更恒定的信号 在更宽的频率带宽上的衰减值。 使用单个电阻梯形网络，使用温度计切换代码实现衰减控制。 使用多个电阻梯形网络，可以使用温度计和气泡切换代码分别实现粗略和精细的衰减控制。
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公开(公告)号：US07402991B2
公开(公告)日：2008-07-22
申请号：US11693628
申请日：2007-03-29
IPC分类号： G01R1/20
CPC分类号： H03H7/24 , G01R1/06766 , H03H11/24
摘要： A wide bandwidth attenuator input circuit for a measurement probe has a Z0 attenuator circuit coupled in series with a compensated RC attenuator circuit. The series attenuator elements of the Z0 and the compensated RC attenuator circuits are coupled via a controlled impedance transmission line to the shunt attenuator elements of the Z0 and the compensated RC attenuator circuits. The shunt element of the Z0 attenuator element terminates the transmission line in its characteristic impedance. The junction of the series and shunt attenuator elements are coupled to the input of a buffer amplifier. At low and intermediate frequencies, the compensated RC attenuator circuit attenuates an input signal while at high frequencies, the compensated RC attenuator circuit acts as a short and the Z0 attenuator circuits attenuates the input signal.
摘要翻译： 用于测量探头的宽带衰减器输入电路具有与补偿的RC衰减器电路串联耦合的Z <0> 0 衰减器电路。 Z 0的串联衰减器元件和经补偿的RC衰减器电路通过受控阻抗传输线耦合到Z 0的分流衰减器元件和经补偿的RC衰减器 电路。 Z＆lt; 0＆gt;衰减器元件的分路元件在其特性阻抗中终止传输线。 串联和分流衰减器元件的结点耦合到缓冲放大器的输入端。 在低频和中频频率下，补偿的RC衰减器电路在高频时衰减输入信号，补偿后的RC衰减器电路作为短路，而Z <0> 0衰减器电路衰减输入信号。
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公开(公告)号：US07002391B1
公开(公告)日：2006-02-21
申请号：US10400819
申请日：2003-03-27
申请人： Ulrik Riis Madsen
发明人： Ulrik Riis Madsen
IPC分类号： H03L5/00
CPC分类号： H03G1/0088 , H03H7/24
摘要： Mobile terminal design is made simpler by providing an attenuation circuit having a selectable amount of attenuation within an integrated circuit. In one embodiment, a plurality of input pins are provided so as to connect to different points of the attenuation circuit. By selecting a particular input pin, a given amount of attenuation is available between the chosen input pin and the output pin. In a second embodiment, resistors within the attenuation circuit are selectively grounded to vary the amount of attenuation between the input pin and the output pin.
摘要翻译： 通过在集成电路内提供具有可选择的衰减量的衰减电路，使移动终端设计变得更简单。 在一个实施例中，提供多个输入引脚以便连接到衰减电路的不同点。 通过选择特定的输入引脚，在所选择的输入引脚和输出引脚之间可以使用给定的衰减量。 在第二实施例中，衰减电路内的电阻器被选择地接地以改变输入引脚和输出引脚之间的衰减量。
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公开(公告)号：US6137365A
公开(公告)日：2000-10-24
申请号：US137316
申请日：1998-08-20
CPC分类号： H03H7/24 , H03G1/0088
摘要： There is disclosed a variable-gain circuit forming resistors on a semiconductor substrate. The ratio of the total resistance to the minimum resistance is made smaller than heretofore. The circuit is miniaturized. The variable-gain circuit comprises an operational amplifier, a first set of resistors R1-Rn+1, a second set of resistors Rx1-Rxm, switches SW1-SWn and a control circuit. This control circuit closes only one of the switches SW1-SWn at all times.
摘要翻译： 公开了一种在半导体衬底上形成电阻器的可变增益电路。 总电阻与最小电阻的比率比以前小。 电路小型化。 可变增益电路包括运算放大器，第一组电阻器R1-Rn + 1，第二组电阻器Rx1-Rxm，开关SW1-SWn和控制电路。 该控制电路始终仅关闭开关SW1-SWn中的一个。
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公开(公告)号：US5929719A
公开(公告)日：1999-07-27
申请号：US874376
申请日：1997-06-19
申请人： Mark Turner
发明人： Mark Turner
CPC分类号： H01R13/665 , H03H7/24
摘要： An attenuated cable is formed with an in-line attenuator conducted between two cable lengths wherein the cable lengths are rigidly joined together by a rigid hollow housing which encloses the attenuator therein. The attenuator circuit is housed within the housing, and is electrically connected to the cable lengths without the use of mechanical connections therebetween. The free ends of the cable lengths farthest from the housing are provided with standard connectors for connecting the cable to additional electrical devices such as microphones, mixers or amplifiers. Since the housing and attenuator circuit are relatively small and light relative to the larger cable lengths, the attenuated cable has substantially the same weight and flexibility as a continuous length of cable.
摘要翻译： 衰减的电缆形成有在两个电缆长度之间传导的在线衰减器，其中电缆长度通过将衰减器包围在其中的刚性中空壳体刚性地连接在一起。 衰减器电路容纳在壳体内，并且电连接到电缆长度，而不使用它们之间的机械连接。 离壳体最远的电缆长度的自由端设有用于将电缆连接到附加电气设备（如麦克风，混频器或放大器）的标准连接器。 由于壳体和衰减器电路相对于较大的电缆长度相对较小且较轻，所以衰减的电缆具有与连续长度的电缆基本上相同的重量和柔性。
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