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    • 64. 发明授权
    • Audio signal amplifying circuit
    • 音频信号放大电路
    • US5825251A
    • 1998-10-20
    • US759952
    • 1996-12-03
    • Eiji Nakagawa
    • Eiji Nakagawa
    • H03F1/00H03F3/21H03F3/72H03G3/34H03F1/14H04B15/00
    • H03F1/305H03F3/72H03G3/348
    • An audio signal amplifying circuit includes a switch circuit disposed between a first power source line and a second power source line for bootstrapping, and a capacitor for bootstrapping disposed between the second power source line and a line to which an output terminal is connected. The switch circuit is controlled from ON to OFF upon receiving a muting signal, and is provided with a first switch circuit constituted by Darlington connected transistors having an NPN type transistor as the output stage thereof and a second switch circuit constituted by a PNP type transistor disposed in parallel with the NPN type transistor. The sum of the rated current values of the NPN type transistor in the first switch circuit and the rated current value of the PNP type transistor in the second switch circuit is selected to be equal to or more than the maximum supply current value for the second power source line, and the rated current of the PNP type transistor in the second switch circuit is selected to be smaller than the rated current values of the transistors in the first switch circuit.
    • 音频信号放大电路包括设置在第一电源线和用于自举的第二电源线之间的开关电路,以及设置在第二电源线与输出端子连接的线路之间的自举电容器。 开关电路在接收到静噪信号时由ON变为OFF,并且具有由具有NPN型晶体管作为其输出级的Darlington连接的晶体管构成的第一开关电路和由配置在PNP型晶体管上的PNP型晶体管构成的第二开关电路 与NPN型晶体管并联。 选择第一开关电路中的NPN型晶体管的额定电流值与第二开关电路中的PNP型晶体管的额定电流值之和等于或大于第二功率的最大供给电流值 源极线,并且第二开关电路中的PNP型晶体管的额定电流被选择为小于第一开关电路中的晶体管的额定电流值。