General-purpose wideband amplifier
    11.
    发明授权
    General-purpose wideband amplifier 失效
    通用宽带放大器

    公开(公告)号:US07602246B2

    公开(公告)日:2009-10-13

    申请号:US10932545

    申请日:2004-09-01

    IPC分类号: H03F3/45 H03F3/16

    摘要: A single-stage amplifier includes (1) first and second “gain” transistors coupled in a common source configuration, (2) first and second resistors providing self-biasing for the first and second transistors, respectively, (3) first and second current sources providing bias currents for the first and second transistors, respectively, and (4) a load impedance coupled between the drains of the first and second transistors. The amplifier may further include (5) third and fourth “compensation” transistors coupled in parallel with, and used to compensate parasitic capacitances of, the first and second transistors, respectively, and (6) third and fourth resistors providing self-biasing for the third and fourth transistors, respectively. Variable gain may be achieved by varying the bias currents for the gain transistors. A two-stage amplifier may be formed with two stages coupled in cascade, with each stage including most or all of the circuit elements of the single-stage amplifier.

    摘要翻译: 单级放大器包括(1)以公共源配置耦合的第一和第二“增益”晶体管,(2)分别为第一和第二晶体管提供自偏压的第一和第二电阻器,(3)第一和第二电流 源极分别为第一和第二晶体管提供偏置电流,以及(4)耦合在第一和第二晶体管的漏极之间的负载阻抗。 放大器还可以包括(5)分别与第一和第二晶体管并联耦合并用于补偿第一和第二晶体管的寄生电容的第三和第四“补偿”晶体管,以及(6)第三和第四电阻器为 第三和第四晶体管。 可以通过改变增益晶体管的偏置电流来实现可变增益。 可以形成两级放大器,其级联耦合两级,每级包括单级放大器的大部分或全部电路元件。