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    Gain enhancement technique for operational amplifiers
    1.
    发明公开
    Gain enhancement technique for operational amplifiers 失效
    操作维护者Verstärkung。

    公开(公告)号：EP0649218A1

    公开(公告)日：1995-04-19

    申请号：EP94307374.2

    申请日：1994-10-07

    申请人： Hewlett-Packard Company

    发明人： Badyal, Rajeev ,  Shu, Shao F.

    IPC分类号： H03F3/45

    CPC分类号： H03F3/45179 ,  H03F3/45192 ,  H03F3/45636 ,  H03F3/45659 ,  H03F2203/45028 ,  H03F2203/45122 ,  H03F2203/45174 ,  H03F2203/45184 ,  H03F2203/45462 ,  H03F2203/45641 ,  H03F2203/45651

    摘要： A folded cascode operational amplifier using an improved gain enhancement technique is described. The folded cascode includes an input section, a cascode current mirror section, and a cascode current section. A first fully-differential operational amplifier is coupled to the cascode current mirror section to provide improved gain enhancement thereto and a second fully-differential operational amplifier is coupled to the cascode current source section to provide improved gain enhancement thereto. The differential inputs of the first fully-differential operational amplifier are coupled to feedback nodes of the cascode current mirror section and the differential outputs of the first fully-differential operational amplifier are coupled to control nodes of the cascode current mirror section. The differential inputs of the second fully-differential operational amplifier are coupled to feedback nodes of the cascode current source section and the differential outputs of the second fully-differential operational amplifier are coupled to control nodes of the cascode current mirror section. Coupling the feedback nodes of both current sources to a single fully-differential operational amplifier increases the common mode noise rejection of the corresponding section.

    摘要翻译： 描述了使用改进的增益增强技术的折叠共源共栅运算放大器。 折叠共源共栅包括输入部分，共源共栅电流镜部分和共源共栅电流部分。 第一全差分运算放大器耦合到共源共栅电流镜部分以提供改进的增益增益，并且第二全差分运算放大器耦合到共源共栅电流源部分以提供改进的增益增益。 第一全差分运算放大器的差分输入耦合到共源共栅电流镜部分的反馈节点，并且第一全差分运算放大器的差分输出耦合到共源共栅电流镜部分的控制节点。 第二全差分运算放大器的差分输入耦合到共源共栅电流源部分的反馈节点，第二全差分运算放大器的差分输出耦合到共源共栅电流镜部分的控制节点。 将两个电流源的反馈节点耦合到单个全差分运算放大器会增加相应部分的共模噪声抑制。