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    • 2. 发明授权
    • Error amplifier reference circuit
    • 误差放大器参考电路
    • US06144250A
    • 2000-11-07
    • US239047
    • 1999-01-27
    • Richard T. OwenDennis P. O'Neill
    • Richard T. OwenDennis P. O'Neill
    • G05F3/26G05F1/10G05F3/16
    • G05F3/265
    • An error amplifier circuit is provided having a pair of current mirror transistors driven by a pair of current sources, where one of the current mirror transistors operates at a lower current density than the other, and further having a resistor in an emitter circuit of the transistor operating at the lower current density and a summing node in the emitter circuit between the emitter of the one transistor and the resistor. A feedback circuit including a second resistor and a base-emitter circuit of a third transistor is in series between a feedback node coupled to the base of the feedback transistor and the summing node, such that a current from the feedback circuit is summed with the current conducted by the emitter of the one transistor. The error amplifier is balanced when the voltage at the feedback node is equal to a predetermined voltage, which can have substantially zero temperature coefficient at a voltage as low as one bandgap voltage. A resistive divider may be coupled to the feedback node, such that the error amplifier is balanced when the voltage at a node of the resistive divider is at a predetermined voltage greater than the bandgap voltage. The error amplifier may be used, among other applications, as a control circuit for a low dropout voltage regulator which is capable of producing a regulated output voltage, having nominally zero temperature drift over a wide operating range, substantially equal to or greater than the bandgap voltage.
    • 提供一种误差放大器电路,其具有由一对电流源驱动的一对电流镜像晶体管,其中电流镜像晶体管中的一个以比另一个更低的电流密度工作,并且还在晶体管的发射极电路中具有电阻器 在较低电流密度下操作,并且在一个晶体管的发射极和电阻之间的发射极电路中的求和节点。 包括第三晶体管的第二电阻器和基极 - 发射极电路的反馈电路串联在耦合到反馈晶体管的基极和求和节点的反馈节点之间,使得来自反馈电路的电流与电流相加 由一个晶体管的发射极导通。 当反馈节点处的电压等于预定电压时,误差放大器是平衡的,其在低至一个带隙电压的电压下可以具有基本上为零的温度系数。 电阻分压器可以耦合到反馈节点,使得当电阻分压器的节点处的电压处于大于带隙电压的预定电压时,误差放大器是平衡的。 除了其他应用之外,误差放大器可以用作用于低压差稳压器的控制电路,其能够产生稳定的输出电压,其在宽的工作范围内具有基本上等于或大于带隙的标称零温度漂移 电压。