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公开(公告)号：US4691384A
公开(公告)日：1987-09-01
申请号：US782888
申请日：1985-10-02
申请人： Tommy L. Jobe
发明人： Tommy L. Jobe
摘要： A multi-drop communication link, consisting of a master and a plurality of slaves is intrinsically safe for use in a hazardous environment. Slaves are in parallel and communicate with the master through transmit and receive shunt-diode safety barriers. An opto-coupler interface is provided between each slave and the transmit and receive circuits communicating with the master. The opto-couplers comprise infrared emitter-detector pairs which can be spaced apart by an intrinsically safe distance.
摘要翻译： 由主机和多个从机组成的多点通信链路本质上是安全的，可用于危险环境。 从机并联并通过发射和接收并联二极管安全屏障与主机通信。 在每个从站和与主站通信的发射和接收电路之间提供光耦合器接口。 光耦合器包括可通过本质安全距离间隔开的红外发射器 - 检测器对。
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公开(公告)号：US3934213A
公开(公告)日：1976-01-20
申请号：US484190
申请日：1974-06-28
申请人： Paul E. Stuckert
发明人： Paul E. Stuckert
CPC分类号： H03H7/48
摘要： A broad band directional coupler including a conventional attenuator is disclosed. The coupler permits detection of signals propagating simultaneously in opposite directions on a single-signal path or transmission line. Detection may occur at one or a multiplicity of ports located at arbitrary positions along the line. In the specific embodiments disclosed, the attenuators employed are symmetrical, .pi., O, T, and H attenuator networks. The invention, however, is equally applicable to .pi., O, T or H attenuator networks which are not symmetrical. The specific embodiments shown employing active devices have wide frequency responses which are flat and flat to DC. Where operation down to DC is not required and where a broad band directional coupler comprised entirely of passive elements is desired, a version of the coupler circuit employing transformers is disclosed. The circuits described have application in analog and digital communication paths where two-way information flow exists and where a multiplicity of ports may share the same path.
摘要翻译： 公开了一种包括常规衰减器的宽带定向耦合器。 耦合器允许在单信号路径或传输线上检测在相反方向同时传播的信号。 可以在位于沿线的任意位置的一个或多个端口处发生检测。 在所公开的具体实施例中，所使用的衰减器是对称的，pi，O，T和H衰减器网络。 然而，本发明同样适用于不对称的π，O，T或H衰减器网络。 所示的使用有源器件的具体实施例具有宽的频率响应，其平坦且与DC平坦。 在不需要低至DC的操作的地方，并且其中期望具有完全由无源元件构成的宽带定向耦合器的情况下，公开了采用变压器的耦合器电路的形式。 所描述的电路应用于存在双向信息流的模拟和数字通信路径，并且多个端口可以共享相同的路径。
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公开(公告)号：US3849609A
公开(公告)日：1974-11-19
申请号：US35780173
申请日：1973-05-07
申请人： PHILIPS CORP
发明人： VOORMAN J
CPC分类号： H04B1/586
摘要： A hybrid circuit for coupling a two-way transmission path to a one-way transmission path and a one-way receiving path, comprising a first amplifier whose input is connected to the receiving path and whose output is connected to the two-way transmission path, a second amplifier whose input is connected to the two-way transmission path and whose output is connected to the transmission path and a third amplifier whose input is connected to the receiving path and whose output is connected to the transmission path, characterized in that the first, second and third amplifiers are current-controlled current amplifiers.
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公开(公告)号：US11190165B1
公开(公告)日：2021-11-30
申请号：US17067522
申请日：2020-10-09
申请人： Melin Ngwar
发明人： Melin Ngwar
摘要： A wideband low power active isolator that may operate with a low voltage supply and provide improved linearity and insertion loss is described. The active isolator includes parallel connected common gate amplifier and common drain amplifier that are implemented using active transistors. A RF choke configured to suppress RF signal is coupled between input to the common gate amplifier and the ground such that the common gate amplifier also functions as a current source biasing the common drain amplifier.
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公开(公告)号：US10177741B1
公开(公告)日：2019-01-08
申请号：US15240992
申请日：2016-08-18
发明人： Jongchan Kang , Hasan Sharifi
摘要： Several embodiments of an envelope tracking active circulator is disclosed with a method to cascade them. In an active transistor based circulator (active circulator), gate (base) and drain (collector) bias voltage can be adjusted by RF or microwave input envelop signal. This is called envelop tracking active circulator. In this concept, input RF signal is detected by detection circuit, such as detection diode or coupler and converted into low frequency envelop signal by the proper filtering circuitry. The generated envelop signal controls the supply voltage of the drain and gate with the proper function of the envelop signal to improve active circulator insertion loss, isolation and power handling capability. This concept can be applied to any type of solid-state FET (Field effect transistor) transistor based active circulator, as long as they have bias dependent trans-conductance and capacitances inside. For a BJT (bipolar junction transistor) based active circulator, base bias current supply modulator will be used instead of voltage supply modulator.
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公开(公告)号：US5087898A
公开(公告)日：1992-02-11
申请号：US663074
申请日：1991-02-28
摘要： An integrated semiconductor active isolator circuit which includes a negative feedback amplifier having an active semiconductor amplifier element. The control terminal of the semiconductor amplifying element defines the output of the isolator circuit and a principal conduction electrode of the semiconductor amplifying element defines an input of the isolator circuit.
摘要翻译： 一种集成半导体有源隔离器电路，其包括具有有源半导体放大器元件的负反馈放大器。 半导体放大元件的控制端限定绝缘电路的输出，半导体放大元件的主导电极限定隔离电路的输入。
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7.发明授权Wide band active circuit three-port circulator for ultra-high frequencies and microwaves 失效宽带有源电路三端口循环器用于超高频和微波
公开(公告)号：US3860893A
公开(公告)日：1975-01-14
申请号：US42974174
申请日：1974-01-02
发明人： ROPARS RAYMOND , HERVE JEAN-YVES
CPC分类号： H03H11/38
摘要： An active circuit one octave circulator made of three identical arms interconnected at the three-ports, each arm consisting of a gyrator comprising voltage and current single stage transistorized amplifiers, the impedance at each port being matched with the standard impedance of microwave circuits, and capacitive interconnecting means are provided at each end of the arms and between the two amplifiers. The circulators are designed as microwave integrated circuits.
摘要翻译： 一个有源电路由三个相互连接在三个端口上的三个相同的臂组成的一个八度循环器，每个臂由包括电压和电流单级晶体管放大器的回转器组成，每个端口的阻抗与微波电路的标准阻抗匹配，电容 互连装置设置在臂的每个端部和两个放大器之间。 循环器设计为微波集成电路。
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公开(公告)号：US09893401B2
公开(公告)日：2018-02-13
申请号：US14554995
申请日：2014-11-26
发明人： Jongchan Kang , Hasan Sharifi , Eric M. Prophet
摘要： A multi-port active circulator where each of a plurality of FET transistors has (i) a gate connected to an associated port of the multi-port active circulator via a capacitor of an associated one of a plurality of first RF chokes, each of the first RF chokes being connected to a gate of an associated FET transistor of said plurality of transistors, the associated port of said associated FET transistor and to a power supply bias connection; (ii) a source connected to a common point; and (iii) a drain connected to the gate of the same FET transistor by a feedback circuit and connected to the gate of a neighboring FET transistor via a capacitor of one of a plurality of second RF chokes, each of which coupling gates and drains of neighboring FET transistors via capacitors thereof and being connected to another power supply bias connection.
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公开(公告)号：US20050189980A1
公开(公告)日：2005-09-01
申请号：US11112426
申请日：2005-04-21
申请人： Robert Washburn , Robert McClanahan
发明人： Robert Washburn , Robert McClanahan
CPC分类号： H03F3/45475 , H03F2200/168 , H03F2203/45138 , H03F2203/45528 , H03H7/52 , H03H11/38
摘要： The present invention is an electronic isolator that provides low input to output insertion loss, high output to input insertion loss, and substantial asymmetric isolation between a source circuit and a load circuit. The invention actively reduces noise and reflected power appearing on the isolator output. In numerous embodiments, the invention operates in circuit applications from dc through millimeter wave. Multistage electronic isolator embodiments provide increased isolation and greater noise reduction. In other embodiments, the electronic isolator also removes noise appearing on its input. In another embodiment, the invention is configured for high power applications. This embodiment includes circuitry for redirecting power away from the load into resistors or other dissipative elements. In another embodiment, the electronic isolator is configured to remove signal distortion produced by one or more power amplifiers in the system.
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公开(公告)号：US5144266A
公开(公告)日：1992-09-01
申请号：US650120
申请日：1991-02-04
IPC分类号： H03H11/38
CPC分类号： H03H11/38
摘要： A broadband high frequency active MMIC circulator which includes low parasitic devices (MESFETs or HEMTs) and shunt feedback for impedance contouring in conjunction with a cascode/cascade isolation/gain network. To achieve circulation, a common series feedback node is required for each active element. While conventional active circulator topologies require the use of a resistive element for operation with a deleterious effect on noise performance, this broadband high frequency active MMIC circulator functions with either resistive or reactive common series feedback. When reactive feedback is selected, major improvements in noise performance can be realized.
摘要翻译： 包括低寄生器件（MESFET或HEMT）的宽带高频有源MMIC环路器以及与共源共栅/级联隔离/增益网络结合的阻抗轮廓的分流反馈。 为了实现循环，每个有源元件都需要一个公共的串联反馈节点。 虽然传统的有源环形器拓扑结构需要使用电阻元件进行操作，对噪声性能产生有害影响，但是这种宽带高频有源MMIC环行器具有电阻或电抗公共串联反馈功能。 当选择反馈反馈时，可以实现噪声性能的重大改进。
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