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公开(公告)号：US09374066B2
公开(公告)日：2016-06-21
申请号：US14524505
申请日：2014-10-27
发明人： Juha-Matti Kujala
CPC分类号： H03H11/405
摘要： This document discusses, among other things, a resistance multiplier configured to provide a more specific and controllable resistance value, the resistance multiplier including an amplifier configured to control a resistance across a first transistor using a received reference resistance value and to control a resistance across a second transistor using the resistance across the first transistor and a relationship between the first and second transistors.
摘要翻译： 本文件尤其讨论了被配置为提供更具体和可控电阻值的电阻倍增器，该电阻乘法器包括放大器，该放大器被配置为使用接收到的参考电阻值来控制跨第一晶体管的电阻并且控制跨越第一晶体管的电阻 使用第一晶体管两端的电阻的第二晶体管以及第一和第二晶体管之间的关系。
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公开(公告)号：US20150116038A1
公开(公告)日：2015-04-30
申请号：US14524505
申请日：2014-10-27
发明人： Juha-Matti Kujala
IPC分类号： H03F1/56
CPC分类号： H03H11/405
摘要： This document discusses, among other things, a resistance multiplier configured to provide a more specific and controllable resistance value, the resistance multiplier including an amplifier configured to control a resistance across a first transistor using a received reference resistance value and to control a resistance across a second transistor using the resistance across the first transistor and a relationship between the first and second transistors.
摘要翻译： 本文件尤其讨论了被配置为提供更具体和可控电阻值的电阻倍增器，该电阻乘法器包括放大器，该放大器被配置为使用接收到的参考电阻值来控制跨第一晶体管的电阻并且控制跨越第一晶体管的电阻 使用第一晶体管两端的电阻的第二晶体管以及第一和第二晶体管之间的关系。
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公开(公告)号：US20090237143A1
公开(公告)日：2009-09-24
申请号：US12053388
申请日：2008-03-21
CPC分类号： H03H11/405 , H03F3/45183 , H03F3/45659 , H03F2200/456 , H03F2203/45318 , H03F2203/45526 , H03F2203/45646 , H03H11/0416 , H03H11/483
摘要： A capacitance multiplier circuit is configured to sense a current through a capacitor in an RC filter of the circuit and to multiply the current so as to achieve a capacitance multiplier effect without adding additional circuitry or requiring additional power. The circuit includes an RC filter, a first signal path connected to a filter output, and a second signal path connected to an input to the filter. A current output through the filter (iout) is split between the two paths, sensed in the first path and multiplied in the second path. The multiplied current is fed back from the second path to the filter input to raise the effective capacitance of capacitor C. The capacitance multiplier circuit, in raising the effective capacitance of the capacitor in the filter, does not affect the frequency response, linearity performance and/or stability of the overall circuit.
摘要翻译： 电容乘法器电路被配置为感测通过电路的RC滤波器中的电容器的电流，并且乘以电流以实现电容倍增器效应，而不增加附加电路或需要额外的功率。 电路包括RC滤波器，连接到滤波器输出的第一信号路径和连接到滤波器的输入端的第二信号路径。 通过滤波器（iout）的电流输出在两条路径之间分开，在第一路径中感测并在第二条路径中相乘。 倍增电流从第二路径反馈到滤波器输入，以提高电容器C的有效电容。电容乘法器电路在提高滤波器中的电容器的有效电容时不影响频率响应，线性性能和 /或整体电路的稳定性。
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4.发明申请公开(公告)号：US20090108924A1
公开(公告)日：2009-04-30
申请号：US12129522
申请日：2008-05-29
IPC分类号： G05F1/10
CPC分类号： H03H11/405 , H03H11/1217
摘要： A design structure of a circuit for managing voltage swings across FETs comprising a reference precision resistor, a first and second FET, wherein a gate of the first FET is tied to a gate of the second FET, wherein a drain to source resistance of the second FET is substantially equal to or is a multiple of a resistance of the reference precision resistor, and wherein a gate voltage of the second FET is applied to a gate of the first FET to set a bias point of the first FET, and a third FET cascoded to the first FET, wherein a source of the first FET is coupled to the drain of the third FET to extend a voltage range in which respective gate voltages of the first and third FETs maintain a linear relationship with respective drain to source voltages of the first and third FETs.
摘要翻译： 一种用于管理跨FET的电压摆动的电路的设计结构，包括参考精密电阻器，第一和第二FET，其中第一FET的栅极连接到第二FET的栅极，其中第二FET的漏极 - 源极电阻 FET基本上等于或者是参考精密电阻器的电阻的倍数，并且其中第二FET的栅极电压被施加到第一FET的栅极以设置第一FET的偏置点，并且第三FET 级联到第一FET，其中第一FET的源极耦合到第三FET的漏极，以扩展电压范围，其中第一和第三FET的相应栅极电压与相应的漏极到源极电压保持线性关系 第一和第三FET。
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公开(公告)号：US06396328B2
公开(公告)日：2002-05-28
申请号：US09730448
申请日：2000-12-05
申请人： Kazuo Kawai
发明人： Kazuo Kawai
IPC分类号： G06F764
CPC分类号： H03H11/405
摘要： A variable capacitance circuit enables electrostatic capacity to be adjusted as a trimmer capacitor, and that enables a temperature characteristic to be set variably. An input voltage is made to lead by a phase angle of 90° due to a differentiating circuit, before being amplified by an in phase amplifier, thus a current with phase angle of 90° shifted is obtained in such a manner as to take out the output while passing through a resistor. Gain and/or an output resistance of the amplifier are made to set variable. If a thermistor is combined with the circuit as a resistance of the differentiating circuit, temperature coefficient can be made to set variable.
摘要翻译： 可变电容电路能够将静电电容调节为微调电容器，并且能够可变地设定温度特性。 在由相位放大器放大之前，由于微分电路使输入电压导致90°的相位角，从而获得相位角为90°偏移的电流，从而取出 输出，同时通过一个电阻。 使放大器的增益和/或输出电阻设定为可变。 如果将热敏电阻与电路组合作为微分电路的电阻，则可以将温度系数设定为可变。
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公开(公告)号：US6037843A
公开(公告)日：2000-03-14
申请号：US175605
申请日：1998-10-20
申请人： Kenneth Stephen Hunt
发明人： Kenneth Stephen Hunt
CPC分类号： H03H11/405 , H03B5/1206 , H03B5/1228 , H03B5/1271 , H03B2201/02
摘要： A controllable reactance implemented within an integrated circuit includes a first sub-circuit (20) comprising a reactive element, for example a capacitor 12, coupled in series with a transistor (14). A controllable current source (16) injects a controllable bias current through the transistor (14) to vary the effective resistance of the transistor (14) and hence the effective complex impedance of the capacitor combination. A second transistor (18) amplifies the current to increase the effective capacitance. Preferably, a second sub-circuit (24) includes corresponding components (26, 28, 30) to mirror the real component of the current flowing in the first sub-circuit (20), and transistors (32 and 34) to reflect an inverse current to the coupling node line (22) to cancel the real component of the current at the node, to thus simulate a purely capacitive circuit. An oscillator embodying this circuit is also disclosed. The invention can provide a controllable capacitance without the need for a conventional varactor diode.
摘要翻译： 在集成电路内实现的可控电抗包括第一子电路（20），其包括与晶体管（14）串联耦合的电抗元件（例如电容器12）。 可控电流源（16）通过晶体管（14）注入可控偏置电流，以改变晶体管（14）的有效电阻，从而改变电容器组合的有效复阻抗。 第二晶体管（18）放大电流以增加有效电容。 优选地，第二子电路（24）包括对应于在第一子电路（20）中流动的电流的实分量的对应部件（26,28,30），以及用于反映第一子电路（20）的晶体管（32和34） 电流到耦合节点线（22）以抵消节点处的电流的实部分量，从而模拟纯电容电路。 还公开了体现该电路的振荡器。 本发明可以提供可控电容，而不需要常规的变容二极管。
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公开(公告)号：US5327027A
公开(公告)日：1994-07-05
申请号：US814965
申请日：1991-12-24
申请人： Stewart S. Taylor
发明人： Stewart S. Taylor
CPC分类号： H03H11/405
摘要： A circuit is described herein which effectively multiplies the value of a capacitor. The circuit draws current from an input node, where this current being drawn is related to the gain of an amplifier and the value of a capacitor, thus effectively amplifying the capacitance value of a capacitor as seen at the input node.
摘要翻译： 这里描述了有效地乘以电容器的值的电路。 该电路从输入节点吸取电流，其中所绘制的电流与放大器的增益和电容器的值相关，从而有效地放大电容器的电容值，如输入节点所示。
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公开(公告)号：US4260968A
公开(公告)日：1981-04-07
申请号：US20587
申请日：1979-03-14
申请人： David G. Haigh , Wolja Saraga
发明人： David G. Haigh , Wolja Saraga
CPC分类号： H03H11/405 , H03H11/0416
摘要： A band-pass filter consists of a number of circuits resistively coupled together to form a ladder network between an input and an output. Each circuit includes a positive impedance converter terminated so as to provide an impedance inversely proportional to the square of the complex frequency, preferably a capacitatively-terminated positive impedance converter is used wherein the impedance conversion ratio is proportional to the complex frequency. The input and output of the filter are resistively terminated such that all reactive elements of the filter are contained within the said circuits. Preferably the capacitors all have the same capacitance value.
摘要翻译： 带通滤波器由许多电路电阻耦合在一起以在输入和输出之间形成梯形网络。 每个电路包括正阻抗转换器，其端接以提供与复数频率的平方成反比的阻抗，优选地使用电容端接的正阻抗转换器，其中阻抗转换比与复频率成正比。 滤波器的输入和输出被电阻地终止，使得滤波器的所有无功元件都包含在所述电路内。 电容器最好都具有相同的电容值。
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公开(公告)号：US4013975A
公开(公告)日：1977-03-22
申请号：US670673
申请日：1976-03-26
申请人： Koji Kataoka , Hisayuki Uchiike
发明人： Koji Kataoka , Hisayuki Uchiike
CPC分类号： H03H11/405 , H03G1/007 , H03G3/001
摘要： A variable resistance circuit comprising a field effect transistor, a plurality of amplifiers and a feedback circuit for one of the amplifiers with the equivalent resistance value derived from a circuit comprising the field effect transistor electrodes and a reference resistor being controlled by a digital signal or a pulse-width signal supplied to the feedback circuit.
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公开(公告)号：US20120105135A1
公开(公告)日：2012-05-03
申请号：US13287449
申请日：2011-11-02
申请人： Hans Halberstadt
发明人： Hans Halberstadt
IPC分类号： H03H11/40
CPC分类号： H03H11/405 , H03H11/481 , H03H11/483
摘要： An electrical circuit for emulating a capacitance, comprises a physical capacitor which is charged by charge flow from the input of the electrical circuit. An amplifier amplifies the voltage at the input of the electrical circuit such that the physical capacitor is charged with a larger change in voltage than the change in voltage at the input. This implements an effective multiplication of capacitance. A reset system resets the physical capacitor without drawing charge from the input of the electrical circuit. This extends the voltages which can be provided to the input.
摘要翻译： 用于仿真电容的电路包括物理电容器，其由电路的输入端通过电荷流充电。 放大器放大电路输入端的电压，使得物理电容器的电压变化比输入端的电压变化更大。 这实现了电容的有效乘法。 复位系统复位物理电容器，而不会从电路的输入中抽取电荷。 这扩展了可以提供给输入的电压。
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