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    • 10. 发明授权
    • Signal amplifier circuit arrangement with output current limiting
function
    • 具有输出电流限制功能的信号放大器电路布置
    • US4410859A
    • 1983-10-18
    • US316633
    • 1981-10-30
    • Hisao Kuwahara
    • Hisao Kuwahara
    • H03F1/42H03F1/52H03F3/45H03G11/02
    • H03F3/45085H03F1/52H03G11/02H03F2203/45598H03F2203/45601H03F2203/45604H03F2203/45664H03F2203/45674
    • A signal amplifier circuit arrangement includes an input amplifying circuit having a current mirror load circuit and an output transistor having its base connected to the output of the input amplifying circuit, its collector connected to the output terminal of the signal amplifying circuit and its emitter connected to a power supply terminal. In the signal amplifier circuit arrangement a current detection resistor is connected between the emitter of the output transistor and the power supply terminal and a diode is connected between the emitter or collector of the output transistor and the collector of a diode-connected transistor of the current mirror circuit. When a large current flows through the output transistor due to the short-circuiting of the output terminal, the diode connected in series with the emitter-base path of a transistor in the current mirror circuit is rendered conductive by a voltage drop developed across the current detection resistor, thus providing a current negative feedback to the base of the output transistor through the current mirror circuit for restricting the collector current of the output transistor.
    • 信号放大器电路装置包括具有电流反射镜负载电路和输出晶体管的输入放大电路,其基极连接到输入放大电路的输出,其集电极连接到信号放大电路的输出端,其发射极连接到 电源端子。 在信号放大器电路装置中,电流检测电阻连接在输出晶体管的发射极和电源端之间,二极管连接在输出晶体管的发射极或集电极与电流二极管连接的晶体管的集电极之间 镜电路。 当由于输出端子的短路而使大电流流过输出晶体管时,与电流镜电路中的晶体管的发射极 - 基极路径串联的二极管通过跨过电流的电压降而导通 检测电阻器,从而通过电流镜电路向输出晶体管的基极提供电流负反馈,以限制输出晶体管的集电极电流。