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402 条记录 (耗时 0.019 秒)

    Differential current amplifier
    72.
    发明授权
    Differential current amplifier 失效
    差分电流放大器

    公开(公告)号：US4429283A

    公开(公告)日：1984-01-31

    申请号：US320434

    申请日：1981-11-12

    申请人： Harold A. Wittlinger

    发明人： Harold A. Wittlinger

    IPC分类号： H03F3/30 ,  H03F3/45

    CPC分类号： H03F3/45179 ,  H03F3/3066 ,  H03F3/4508 ,  H03F3/45183 ,  H03F3/45278 ,  H03F2203/45141 ,  H03F2203/45221 ,  H03F2203/45274 ,  H03F2203/45278 ,  H03F2203/45658

    摘要： A differential current amplifier includes a differential input transistor pair having respective first and second unity gain current mirror amplifiers (CMA) connected in their respective output circuits. The output terminal of the CMA connected in the output circuit of the first transistor of the differential pair is connected to the input terminal of the second transistor of the differential pair. The output terminal of the CMA connected in the output circuit of the second transistor is connected to the input terminal of the first transistor. The current feedback to the input terminals of the differential pair conditions them to be responsive to input signal currents. An amplifier output current can be derived from an additional current output from one of the first and second CMA's, the additional CMA output having a gain of A relative to the unity gain output.

    摘要翻译： 差分电流放大器包括差分输入晶体管对，其具有连接在其各自的输出电路中的相应的第一和第二单位增益电流镜放大器（CMA）。 连接在差分对的第一晶体管的输出电路中的CMA的输出端连接到差分对的第二晶体管的输入端。 连接在第二晶体管的输出电路中的CMA的输出端连接到第一晶体管的输入端。 对差分对的输入端的电流反馈使它们响应于输入信号电流。 可以从第一和第二CMA之一的附加电流输出导出放大器输出电流，附加CMA输出相对于单位增益输出具有A的增益。

    Audio power amplifier
    73.
    发明授权
    Audio power amplifier 失效
    音频功率放大器

    公开(公告)号：US4241313A

    公开(公告)日：1980-12-23

    申请号：US606425

    申请日：1975-08-21

    申请人： Takao Takehara

    发明人： Takao Takehara

    IPC分类号： H03F3/185 ,  H03F3/20 ,  H03F3/30 ,  H03F3/45 ,  H03F3/16

    CPC分类号： H03F3/4508 ,  H03F3/185 ,  H03F3/3008 ,  H03F3/3023 ,  H03F3/3045 ,  H03F3/3054 ,  H03F3/45085 ,  H03F3/45179 ,  H03F3/45183 ,  H03F3/45381 ,  H03F2200/516 ,  H03F2203/45498 ,  H03F2203/45591 ,  H03F2203/45686 ,  H03F2203/45701 ,  H03F2203/45702

    摘要： An audio power amplifier comprising a first stage voltage amplifier circuit, a second stage voltage amplifier circuit and a last stage power amplifier circuit. The first stage voltage amplifier circuit is of differential amplifier type including a pair of field effect transistors for voltage amplifying an audio frequency signal. The second stage voltage amplifier circuit includes a field effect transistor for voltage amplifying the output signal from the first stage voltage amplifier circuit. The second stage voltage amplifier circuit also serves as a drive stage. The last-stage power amplifier circuit includes a pair of field effect transistors having drain voltage versus drain current characteristics similar to static plate voltage versus plate current characteristics of a triode vacuum tube for power amplifying the output signals of the second stage voltage amplifier circuit.

    摘要翻译： 一种音频功率放大器，包括第一级电压放大器电路，第二级电压放大器电路和最后级功率放大器电路。 第一级电压放大器电路是差分放大器类型，包括用于对音频信号进行电压放大的一对场效应晶体管。 第二级电压放大器电路包括用于对来自第一级电压放大器电路的输出信号进行电压放大的场效应晶体管。 第二级电压放大器电路也用作驱动级。 最后一级功率放大器电路包括一对场效应晶体管，其具有类似于用于功率放大第二级电压放大器电路的输出信号的三极管真空管的静态板电压与板电流特性的漏极电压对漏极电流特性。

    TRANSIMPEDANCE AMPLIFIERS
    75.
    发明公开
    TRANSIMPEDANCE AMPLIFIERS 审中-公开

    公开(公告)号：US20240356504A1

    公开(公告)日：2024-10-24

    申请号：US18303331

    申请日：2023-04-19

    申请人： Semtech Corporation

    发明人： Behzad FARZANEH ,  Matthew George HAGMAN ,  Christopher John BORN

    IPC分类号： H03F3/45 ,  H03F1/32 ,  H04B10/60

    CPC分类号： H03F3/4508 ,  H03F1/32 ,  H04B10/60

    摘要： This application relates to transimpedance amplifiers (TIAs), in particular to TIAs with wideband feedback. The TIA has an input stage, for receiving an input current and outputting a corresponding output voltage, with a first transistor configured as an input transistor in a first circuit branch. A reference controller is configured to provide a reference voltage with a value equal to a DC value of the output voltage and a voltage regulator is configured to receive a supply voltage and generate a regulated voltage with a voltage offset to the reference voltage, such that the voltage offset does not substantially vary with variation in at least one of the supply voltage, temperature and process variations. The regulated voltage is supplied as a supply voltage to the input stage. The TIA also includes control circuitry for controlling an effective transconductance of the first transistor to a defined value.

    OPTICAL AMPLIFICATION APPARATUS FOR A SUBMARINE OPTICAL AMPLIFIER AND RELATED OPTICAL AMPLIFIER
    76.
    发明公开
    OPTICAL AMPLIFICATION APPARATUS FOR A SUBMARINE OPTICAL AMPLIFIER AND RELATED OPTICAL AMPLIFIER 审中-公开

    公开(公告)号：US20230216265A1

    公开(公告)日：2023-07-06

    申请号：US17999562

    申请日：2021-05-27

    申请人： SUBPHOTON S.R.L.

    发明人： Daniele ANDRONI

    IPC分类号： H01S3/067 ,  H03F3/45 ,  H03F1/56

    CPC分类号： H01S3/06754 ,  H03F3/4508 ,  H03F1/565

    摘要： Optical amplification apparatus (1) for a submarine optical amplifier (90), the optical amplification apparatus (1) comprising an optical amplification system (2), comprising at least one active component (3), and a DC/DC converter (4) connected to supply the optical amplification system (2), wherein the DC/DC converter (4) comprises a first commutator (5) and a pulse modulator (6) connected to the first commutator (5) for cyclically switching with a duty cycle the first commutator (5) between a closing configuration, in which it can be passed thought by a current, and an opening configuration, in which it cannot be passed thought by the current, characterized in that the DC/DC converter (4) comprises a retroaction circuit (7) comprising, a first differential amplifier (8) connected for receiving, at a first input port, a first signal (100) representative of at least a voltage at output from the DC/DC converter (4) and at input into the optical amplification system (2) and, at a second input port, a first reference signal (201), the first differential amplifier (8) being structured for generating a first error signal (101) representative of a difference between the first signal (100) and the first reference signal (201), a second differential amplifier (9) connected to the first differential amplifier (8) for receiving, at a first respective input port, the first error signal (101) and, at a second respective input port, a second reference signal (201), the second differential amplifier (9) being structured for generating a second error signal (102) representative of a difference between the first error signal (101) and the second reference signal (201), wherein the second error signal (102) is proportional to a deviation of the voltage at output from the DC/DC converter (4) with respect to a nominal working voltage of the optical amplification system (2), in that the first input port of the first differential amplifier (8) and the first respective input port of the second differential amplifier (9) are concordant ports, and in that the pulse modulator (6) is connected to the second differential amplifier (9) for receiving the second error signal (102) and for regulating the duty cycle as a function of the second error signal (102).