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    • 6. 发明授权
    • Constant-current circuit for logic circuit in integrated semiconductor
    • 集成半导体逻辑电路的恒流电路
    • US6023157A
    • 2000-02-08
    • US989772
    • 1997-12-12
    • Masataka Kazuno
    • Masataka Kazuno
    • H03K19/0952G05F3/24G05F3/16G05F1/10G05F3/02H02J3/38
    • G05F3/247G05F3/245
    • According to the present invention, a first voltage is generated at a drain of a first MESFET by a first stage circuit that includes a plurality of diode elements and the first MESFET with its gate and drain connected together provided between power sources. The first voltage is applied to a gate of a second MESFET that performs a source follower operation so that a constant second voltage, which is lower by the equivalent of a threshold voltage than the first voltage, is generated at the source. A third MESFET with a diode connection is provided between the second voltage source and a lower power source, and a bias voltage is generated at the drain terminal of the third MESFET. The bias voltage is supplied to the gate of a constant-current transistor, the source of which is connected to the lower power source. The current of the constant-current transistor is supplied to an SCFL circuit, the source of which is connected for common use.
    • 根据本发明,在包括多个二极管元件的第一级电路的第一MESFET的漏极处产生第一电压,并且在电源之间连接有第一MESFET的栅极和漏极连接在一起。 第一电压被施加到执行源极跟随器操作的第二MESFET的栅极,使得在源极处产生比等于第一电压的阈值电压相当的恒定的第二电压。 在第二电压源和下电源之间提供具有二极管连接的第三MESFET,并且在第三MESFET的漏极端产生偏置电压。 偏置电压被提供给恒流晶体管的栅极,其源极连接到下电源。 恒流晶体管的电流被提供给SCFL电路,SCFL电路的源极连接用于常用。