Attenuator
    2.
    发明授权
    Attenuator 失效
    衰减器

    公开(公告)号:US5453721A

    公开(公告)日:1995-09-26

    申请号:US257603

    申请日:1994-06-09

    IPC分类号: H03H7/07 H03H7/24

    CPC分类号: H03H7/0123 H03H7/07

    摘要: An electrical circuit (200) having an input terminal (201), an output terminal (202), and a signal common (203) is preferably used to attenuate an electrical signal. The electrical circuit (200) comprises four impedance elements (205-208) and an impedance transformer (210). A first impedance element (205) is coupled between the input terminal (201) and a first node (212), while a second impedance element (206) is coupled between the first node (212) and the output terminal (202). A third impedance element (207) is coupled between the input terminal (201) and the output terminal (202), while a fourth impedance element (208) is coupled between a second node (213) and the signal common (203). The impedance transformer (210) is coupled between the first node (212) and the second node (213) to complete the electrical circuit (200).

    摘要翻译: 具有输入端(201),输出端(202)和信号共用(203)的电路(200)优选用于衰减电信号。 电路(200)包括四个阻抗元件(205-208)和阻抗变压器(210)。 第一阻抗元件(205)耦合在输入端(201)和第一节点(212)之间,而第二阻抗元件(206)耦合在第一节点(212)和输出端(202)之间。 第三阻抗元件(207)耦合在输入端(201)和输出端(202)之间,而第四阻抗元件(208)耦合在第二节点(213)和信号公共端(203)之间。 阻抗变换器(210)耦合在第一节点(212)和第二节点(213)之间以完成电路(200)。

    Feed forward distortion minimization circuit
    3.
    发明授权
    Feed forward distortion minimization circuit 失效
    前馈失真最小化电路

    公开(公告)号:US5077532A

    公开(公告)日:1991-12-31

    申请号:US628539

    申请日:1990-12-17

    IPC分类号: H03F1/32

    CPC分类号: H03F1/3235 H03F2201/3212

    摘要: A feed forward distortion minimization circuit which receives an input signal and routes the input signal along two signal paths is disclosed. One path, the main signal path, includes a distortion generator such as, for example, a power amplifier, which generates an output signal having a distortion component. The other path, the feed forward signal path, includes a delay line responsive to the input signal for feeding the input signal forward, without distortion. The output signal from the distortion generator is combined with a fed forward input signal to form an error signal representative of the distortion component. A feedback circuit is employed to detect a DC current or RF voltage proportional to the error signal's signal strength and to adjust the amplitude and the phase of signals in the feed forward or main signal paths to reduce the carrier to distortion ratio of the error signal. Thereafter, the error signal is subtracted from the main signal path to cancel any distortion components therein. The subtraction is controlled by circuitry which detects distortion at the main signal path output, and adjusts the amplitude and the phase of the error signal, so that when the error signal is subtracted from the main signal path, substantially all distortion is cancelled.

    摘要翻译: 公开了一种接收输入信号并沿着两个信号路径路由输入信号的前馈失真最小化电路。 一个路径,主信号路径,包括失真发生器,例如功率放大器,其产生具有失真分量的输出信号。 另一路径,前馈信号路径,包括响应于输入信号的延迟线,用于向前馈送输入信号,而不失真。 来自失真发生器的输出信号与馈送的正向输入信号组合以形成表示失真分量的误差信号。 采用反馈电路来检测与误差信号强度成比例的直流电流或射频电压,并调整前馈信号或主信号路径中信号的振幅和相位,以减小误差信号的载波失真比。 此后,从主信号路径减去误差信号以消除其中的任何失真分量。 该减法由检测主信号路径输出端的失真的电路控制,并调整误差信号的振幅和相位,使得当从主信号路径减去误差信号时,基本上全部失真均被消除。

    Method and apparatus for optimizing the performance of a power amplifier
circuit
    4.
    发明授权
    Method and apparatus for optimizing the performance of a power amplifier circuit 失效
    用于优化功率放大器电路的性能的方法和装置

    公开(公告)号:US5119040A

    公开(公告)日:1992-06-02

    申请号:US637432

    申请日:1991-01-04

    IPC分类号: H03F1/26 H03F1/32

    摘要: The present invention discloses a method and apparatus for optimizing the performance of a power amplifier circuit. In accordance therewith, one of the intermodulation products generated during a power amplifier's operation is selected. This selection is based upon the intermodulation product's amplitude. Next, the intermodulation product's amplitude is compared to a predetermined threshold. Based upon this comparison, various power amplifier circuit operating parameters are altered in order to improve the circuit's intermodulation performance or to maximize its operating capacity.

    摘要翻译: 本发明公开了一种用于优化功率放大器电路的性能的方法和装置。 因此,选择在功率放大器的操作期间产生的互调产物之一。 该选择基于互调产物的幅度。 接下来,将互调产物的幅度与预定阈值进行比较。 基于这种比较,改变各种功率放大器电路工作参数,以便改善电路的互调性能或最大化其工作容量。