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    • 9. 发明授权
    • Constant-current generator, differential amplifier, and semiconductor integrated circuit
    • 恒流发电机,差分放大器和半导体集成电路
    • US06452453B1
    • 2002-09-17
    • US09562289
    • 2000-05-01
    • Shinya FujiokaAkihiro Funyu
    • Shinya FujiokaAkihiro Funyu
    • H03F304
    • H03F1/301H03F2203/45456H03F2203/45508
    • The constant-current generator comprises a bias transistor whose drain and gate are connected to each other, and an outputting transistor. The threshold voltage of the outputting transistor is smaller than that of the bias transistor. The outputting transistor has the same source voltage and the same gate voltage as those of the bias transistor. Therefore, the gate-to-source voltages of the outputting transistor and the bias transistor are always kept equal. On the other hand, the drain-to-source current of the outputting transistor becomes larger than that of the bias transistor in accordance with the difference between the threshold voltages of the outputting transistor and the bias transistor. Accordingly, the outputting transistor can output a stable drain-to-source current even when the drain voltage of the bias transistor has shifted to lower the gate-to-source voltage thereof.
    • 恒流发生器包括漏极和栅极彼此连接的偏置晶体管和输出晶体管。 输出晶体管的阈值电压小于偏置晶体管的阈值电压。 输出晶体管具有与偏置晶体管相同的源极电压和相同的栅极电压。 因此,输出晶体管和偏置晶体管的栅极 - 源极电压总是保持相等。 另一方面,根据输出晶体管和偏置晶体管的阈值电压之差,输出晶体管的漏极 - 源极电流变得大于偏置晶体管的漏极 - 源极电流。 因此,即使当偏置晶体管的漏极电压已经偏移以降低其栅极至源极电压时,输出晶体管也可以输出稳定的漏极 - 源极电流。