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    • 1. 发明授权
    • Electrical current source circuitry for a bus
    • 总线电流源电路
    • US5254883A
    • 1993-10-19
    • US872919
    • 1992-04-22
    • Mark A. HorowitzJames A. GasbarroWingyu Leung
    • Mark A. HorowitzJames A. GasbarroWingyu Leung
    • G06F3/00G05F1/613G11C11/401H03K19/0175H03K19/0185H04L25/02H03K19/003
    • H04L25/0282H03K19/018585H04L25/0298
    • Electrical current source circuitry for a bus is described. The circuitry includes transistor circuitry coupled between the bus and ground for controlling bus current, control circuitry coupled to the transistor circuitry, and a controller coupled to the control circuitry for controlling the transistor circuitry. The controller comprises a variable level circuit comprising setting circuitry for setting a desired current for the bus and transistor reference circuitry coupled to the setting circuitry. The variable level circuit provides a first voltage. Voltage reference circuitry provides a reference voltage. Comparison circuitry is coupled to the voltage reference circuitry and to the variable level circuit for comparing the first voltage with the reference voltage. Logic circuitry is responsive to a trigger signal from the comparison circuitry. An output of the logic circuitry is coupled to the control circuitry in order to turn on the transistor circuitry in a manner dependent upon an output of the logic circuitry.
    • 描述了用于总线的电流源电路。 电路包括耦合在总线和地之间的晶体管电路,用于控制总线电流,耦合到晶体管电路的控制电路以及耦合到控制电路的用于控制晶体管电路的控制器。 控制器包括可变电平电路,其包括用于设置用于总线的期望电流的设置电路和耦合到该设置电路的晶体管参考电路。 可变电平电路提供第一电压。 电压参考电路提供参考电压。 比较电路耦合到电压参考电路和可变电平电路,用于将第一电压与参考电压进行比较。 逻辑电路响应来自比较电路的触发信号。 逻辑电路的输出耦合到控制电路,以便以取决于逻辑电路的输出的方式接通晶体管电路。