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    • 8. 发明授权
    • Bias circuit and amplifier
    • 偏置电路和放大器
    • US09294044B2
    • 2016-03-22
    • US14213946
    • 2014-03-14
    • KABUSHIKI KAISHA TOSHIBA
    • Shusuke KawaiMasahiro HosoyaTong WangToshiya MitomoShigehito SaigusaTetsuro Itakura
    • H03F3/04H03F1/30
    • H03F1/301H03F2200/18H03F2200/447H03F2200/78
    • A bias circuit according to an embodiment is a bias circuit that supplies a bias voltage to an amplifying element. The bias circuit of the embodiment includes a first current source that has a characteristic of varying an output current with the surrounding temperature variations, and a second current source that has a different output characteristic from the first current source and that can control the output current. The bias circuit of the embodiment also includes a comparator for comparing the output current of the first current source with the output current of the second current source, and a bias supply part that controls the output current of the second current source on the basis of the comparison result of the comparator and supplies a bias voltage to the amplifying element in accordance with the comparison result.
    • 根据实施例的偏置电路是向放大元件提供偏置电压的偏置电路。 该实施例的偏置电路包括具有随着周围温度变化而改变输出电流的特性的第一电流源和具有与第一电流源不同的输出特性并且可以控制输出电流的第二电流源。 该实施例的偏置电路还包括用于将第一电流源的输出电流与第二电流源的输出电流进行比较的比较器,以及基于第二电流源控制第二电流源的输出电流的偏置电源部分 比较器的比较结果,并根据比较结果向放大元件提供偏置电压。