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    • 52. 发明授权
    • Miller loop compensation network with capacitive drive
    • 具有电容驱动的米勒回路补偿网络
    • US5204639A
    • 1993-04-20
    • US873855
    • 1992-04-27
    • Bradley T. MooreRobert L. VyneRenwin J. Yee
    • Bradley T. MooreRobert L. VyneRenwin J. Yee
    • H03F1/08
    • H03F1/083
    • A monolithic operational amplifier (10) having an Miller loop compensation network (13) with improved capacitive drive. The monolithic operational amplifier (10) has an input stage (11), an output stage (12), and a compensation network (13). The compensation network (13) provides negative feedback between an output node (19) of the output stage (12) and an input node (16) of the output stage (12). The compensation network (13) has a compensation capacitor (26), a resistor (27), an isolation resistor (33), a shunt capacitor (28), and an isolation transistor (25). The compensation network (13) creates a dominant pole, a zero and a nondominant pole having a higher frequency than the zero. The nondominant pole improves a gain margin while preserving sufficient phase margin. The isolation transistor (25) provides improved capacitive drive.
    • 具有具有改进的电容驱动的米勒环路补偿网络(13)的单片运算放大器(10)。 单片运算放大器(10)具有输入级(11),输出级(12)和补偿网络(13)。 补偿网络(13)在输出级(12)的输出节点(19)和输出级(12)的输入节点(16)之间提供负反馈。 补偿网络(13)具有补偿电容器(26),电阻器(27),隔离电阻器(33),并联电容器(28)和隔离晶体管(25)。 补偿网络(13)产生具有比零更高频率的主极,零极和非主导极。 非优势极提高增益裕度,同时保持足够的相位裕量。 隔离晶体管(25)提供改进的电容驱动。