公开(公告)号：WO0213380A3

公开(公告)日：2003-01-09

申请号：PCT/US0124494

申请日：2001-08-03

Applicant: MAXIM INTEGRATED PRODUCTS ,  KOLLURI MADHAV V ,  MANEY J WILLIAM ,  EDWARDS CHRISTOPHER F

Inventor： KOLLURI MADHAV V ,  MANEY J WILLIAM ,  EDWARDS CHRISTOPHER F

IPC: H03G3/34

CPC classification number: H03G3/345

Abstract: Methods and apparatus for muting the output of amplifier circuits. For normal operation, the amplifiers are connected as feedback amplifiers having a gain set by the signal input and feedback circuits connected to the inverting input to the amplifier. For muting, the signal input is disconnected from the inverting input to the amplifier and the amplifier output is connected to the inverting input, making the amplifier a unity gain amplifier with respect to the input to the non-inverting input. In one embodiment, the signal input is disconnected from the inverting input to the amplifier and the amplifier output is connected to the inverting input using switching devices. In another embodiment, the amplifier output is permanently connected to the inverting input through an impedance element.

Abstract translation: 用于使放大器电路的输出静音的方法和装置。 对于正常操作，放大器被连接作为反馈放大器，其具有由信号输入设置的增益和连接到放大器的反相输入端的反馈电路。 为了静音，信号输入与反相输入端连接到放大器，放大器输出端连接到反相输入，使放大器相对于非反相输入的输入为单位增益放大器。 在一个实施例中，信号输入与放大器的反相输入断开，并且使用开关装置将放大器输出连接到反相输入。 在另一个实施例中，放大器输出通过阻抗元件永久地连接到反相输入端。

公开(公告)号：WO0213372A2

公开(公告)日：2002-02-14

申请号：PCT/US0124495

申请日：2001-08-03

Applicant: MAXIM INTEGRATED PRODUCTS ,  KOLLURI MADHAV V ,  MANEY J WILLIAM ,  EDWARDS CHRISTOPHER F

Inventor： KOLLURI MADHAV V ,  MANEY J WILLIAM ,  EDWARDS CHRISTOPHER F

IPC: H03F1/30 ,  H03F1/26

CPC classification number: H03F1/30

Abstract: The present invention is an apparatus and method to provide a high supply rejection and a full rail-to-rail output swing in an amplifier circuit. A first stage generates a first output. The first stage is powered by a second supply. A second stage is coupled to the first stage to generate an amplifier output. The second stage is powered by a first supply. The first and second supplies are different in regulation mode. By making the second supply a low noise supply, the power supply noise amplified by the first stage is minimized, with the voltage gain of the second stage regaining the rail-to-rail swing lost by the first stage due to the regulator supplying very low noise power to the first stage.

Abstract translation: 本发明是一种在放大器电路中提供高电源抑制和完整的轨到轨输出摆幅的装置和方法。 第一阶段产生第一输出。 第一阶段由第二个供应商供电。 第二级耦合到第一级以产生放大器输出。 第二阶段由第一个供应商提供。 第一和第二供应在调节模式中是不同的。 通过使第二次供电成为低噪声电源，第一级放大的电源噪声最小化，由于调节器供电非常低，第二级的电压增益恢复了第一级的轨至轨摆动损失 噪声功率达到第一阶段。

公开(公告)号：WO9938254A3

公开(公告)日：1999-09-30

申请号：PCT/US9823438

申请日：1998-11-03

Applicant: MAXIM INTEGRATED PRODUCTS

Inventor： KOLLURI MADHAV V

IPC: H03F3/30 ,  H03F3/343 ,  H03F3/45

CPC classification number: H03F3/45291 ,  H03F3/3023 ,  H03F2203/45028 ,  H03F2203/45302

Abstract: Operational amplifiers with a gain enhancement apparatus and method result in a substantial improvement in the gain of such amplifiers without change in the gain of the signal amplifying transistors. The gain enhancement is achieved by providing a circuit for having one transistor in the folded cascode stage of the amplifier substantially track the operating conditions of another transistor in the folded cascode stage, thereby substantially eliminating the unbalanced differential drive from the differential input stage that would have been required to accommodate the Early effect in the second stage. This is particularly advantageous when driving MOS output drivers wherein large voltage excursions in the second stage are required, particularly when sinking current from a load.

Abstract translation: 具有增益增强装置和方法的运算放大器导致这种放大器的增益的显着提高，而不改变信号放大晶体管的增益。 通过提供用于使放大器的折叠共源共栅级中的一个晶体管基本跟踪折叠共源共栅级中的另一晶体管的操作条件的电路来实现增益增强，从而基本上消除了来自差分输入级的不平衡差分驱动， 被要求在第二阶段适应早期效应。 这在驱动MOS输出驱动器时特别有利，其中需要第二级中的大电压偏移，特别是当从负载吸收电流时。