公开(公告)号：US06297696B1

公开(公告)日：2001-10-02

申请号：US09593705

申请日：2000-06-15

Applicant: Mehdy Abdollahian ,  James R. Griffiths ,  Theodore L. Tewksbury

Inventor： Mehdy Abdollahian ,  James R. Griffiths ,  Theodore L. Tewksbury

IPC: H03F328

CPC classification number: H03F3/602

Abstract: Apparatus and method for reducing reflected power in a radio frequency amplifier. A first directional coupler divides the radio frequency signal to first and second quadrature signals. First and second amplifiers amplify each of the quadrature signals. A second directional coupler combines signals from the amplifiers to produce a combined signal. A third directional coupler samples a portion of the reflected power received on the second directional coupler output. A control signal is derived from sampling the reflected power. A variable load impedance connected to the remaining output port of the second directional coupler has an impedance value which changes with respect to a control signal and the impedance is varied so as to substantially match the impedance received by the first output port.

Abstract translation: 降低射频放大器反射功率的装置和方法。 第一定向耦合器将射频信号划分为第一和第二正交信号。 第一和第二放大器放大每个正交信号。 第二定向耦合器组合来自放大器的信号以产生组合信号。 第三定向耦合器对在第二定向耦合器输出上接收的反射功率的一部分进行采样。 通过对反射功率的采样导出控制信号。 连接到第二定向耦合器的剩余输出端口的可变负载阻抗具有相对于控制信号改变的阻抗值，并且阻抗被改变，以便基本匹配由第一输出端口接收的阻抗。

公开(公告)号：US06590448B1

公开(公告)日：2003-07-08

申请号：US09654434

申请日：2000-09-01

Applicant: Rodney T. Burt

Inventor： Rodney T. Burt

IPC: H03F328

CPC classification number: H03F3/68 ,  H03F3/45071 ,  H04R2225/59 ,  Y10S257/919

Abstract: A technique is disclosed which facilitates the layout of op amp cells, for example, two-stage op amp cells or three-stage op amp cells, to provide larger operational amplifiers. In accordance with one aspect, the op amp cells can be suitably coupled in parallel to provide a larger operational amplifier. This paralleling aspect can be facilitated by connecting the respective negative and positive inputs of a predetermined number of input gm stages together, connecting the outputs of a predetermined number of output gm stages together, and connecting a predetermined number of intermediate internal nodes between the input gm stages and the output gm stages together, without the occurrence of saturation of the internal nodes. In addition, the input and output characteristics of operational amplifier can be suitably improved. Further, the plurality of op amp cells can be selectively configurable to be connected in parallel with other op amp cells through the use of, for example, manual switches or other suitable electrical contacts, jumpers and the like, or programmable switches. Moreover, the op amp cells can be suitably configured in various arrangements, such as a two-stage cell having a first gm stage with a single-ended output, a two-stage cell having a first gm stage with a differential output, or a three-stage op amp cell. As a result, the method of the present invention can provide a substantial advantage in the design of integrated circuits in which the development costs are high, and multiple custom mask sets are too expensive to be practical.

Abstract translation: 公开了一种有利于运算放大器的布局的技术，例如两级运算放大器或三级运算放大器，以提供更大的运算放大器。 根据一个方面，运算放大器电池可以适当地并联耦合以提供更大的运算放大器。 通过将预定数量的输入gm级的相应负和正输入连接在一起，将预定数量的输出gm级的输出连接在一起，并将预定数量的中间内部节点连接在输入gm之间，可以促进并行方面 阶段和输出gm阶段，而不会发生内部节点的饱和。 此外，可以适当地提高运算放大器的输入和输出特性。 此外，可以通过使用例如手动开关或其它合适的电触点，跳线等或可编程开关来选择性地配置多个运算放大器单元与其它运算放大器并联连接。 此外，可以以各种布置适当地配置运算放大器单元，例如具有单端输出的第一gm级的两级单元，具有差分输出的第一gm级的两级单元，或者 三级运算放大器。 结果，本发明的方法可以在开发成本高的集成电路的设计中提供显着的优点，并且多个定制掩模组太贵而不实际。