公开(公告)号：WO02075920A3

公开(公告)日：2003-03-27

申请号：PCT/US0206483

申请日：2002-03-05

Applicant: RF MICRO DEVICES INC

Inventor： STEEL VICTOR E ,  JORGENSON JON D ,  VU KHOI TAM

IPC: H03F1/02

CPC classification number: H03F1/0277

Abstract: An amplifier provides two or more selectively enabled amplifier segments allowing a source signal to be amplified with a selectable output power. A bias circuit responsive to a bias control signal enables selectable combinations of one or more amplifier segments, thus allowing selection of a desired output power. Selecting a desired output signal power via the bias control signal corresponds to selecting an overall amplifier quiescent current that decreases with decreasing output signal power. Thus, the amplifier permits a controlling system, such as a mobile terminal (e.g., cellular telephone) to amplify a transmit signal with a selectable transmit signal output power and corresponding level of amplifier quiescent power consumption. Preferably, each segment comprises one or more transistor amplification stages which, when enabled by the bias circuit, are biased to permit maximum power linear amplification for the transmit signal.

Abstract translation: 放大器提供两个或更多个选择性使能的放大器段，允许以可选择的输出功率放大源信号。 响应于偏置控制信号的偏置电路使得能够选择一个或多个放大器段的组合，从而允许选择期望的输出功率。 通过偏置控制信号选择所需的输出信号功率对应于选择随着输出信号功率的降低而减小的整体放大器静态电流。 因此，放大器允许诸如移动终端（例如，蜂窝电话）之类的控制系统以可选择的发射信号输出功率和相应的放大器静态功率消耗水平来放大发射信号。 优选地，每个段包括一个或多个晶体管放大级，当由偏置电路使能时，该晶体管放大级被偏置以允许发射信号的最大功率线性放大。

公开(公告)号：AU2002332018A1

公开(公告)日：2003-04-22

申请号：AU2002332018

申请日：2002-10-03

Applicant: RF MICRO DEVICES INC

Inventor： JORGENSON JON D ,  DENING DAVID ,  STEEL VICTOR E

IPC: H03G3/30 ,  H03F1/02

Abstract: The present invention eliminates the need for complex impedance networks or parallel amplification stages for multi-mode mobile terminals. A wideband power amplifier is configured to amplify signals in different frequency bands corresponding to different operating modes. The supply voltage of the wideband power amplifier is adjusted in light of the load impedance of radiating circuitry to achieve a desired output power for the respective operating modes.