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    • 3. 发明授权
    • Differential amplifier having a protection circuit
    • 差分放大器具有保护电路
    • US5905617A
    • 1999-05-18
    • US17674
    • 1998-02-03
    • Yujiro Kawasoe
    • Yujiro Kawasoe
    • H03F3/45H03F1/52H02H3/18
    • H03F1/52
    • In a differential amplifier, when an output node of an output buffer circuit is short-circuited to a high potential supply node, the difference between the potential at an output node of an amplifying circuit and the potential at the output node of the buffer circuit becomes so great as not to be produced in normal operation. A short-circuit protection circuit detects such a state and interrupts or limits a base current supplied to an output transistor of an output pull signal generating circuit, suppressing the flow of excess current into the output node of the buffer circuit.
    • 在差分放大器中,当输出缓冲器电路的输出节点与高电位电源节点短路时,放大电路的输出节点处的电位与缓冲电路的输出节点处的电位之间的差成为 在正常运行中不会产生如此之大。 短路保护电路检测这种状态,并且中断或限制提供给输出拉出信号发生电路的输出晶体管的基极电流,从而抑制进入缓冲电路输出节点的过剩电流。