公开(公告)号：WO1991012671A1

公开(公告)日：1991-08-22

申请号：PCT/US1991000306

申请日：1991-01-15

Applicant: MOTOROLA, INC.

Inventor： MOTOROLA, INC. ,  SIWIAK, Kazimierz ,  MINASI, David, H.

IPC: H04B01/04

CPC classification number: H04B1/0458 ,  H04B2001/0416

Abstract: A radio-frequency amplifier (50) has an impedance transformation network (66) with a control input (70) for controlling the transformation characteristic of the transformation network (66). The radio-frequency amplifier (50) amplifies an input signal to produce an amplified radio-frequency output signal to a load (68). The control circuit selects a power level for the output signal, in response to a control signal, by transforming the impedance of the load to a transformed impedance at the output of the radio-frequency amplifier, so that the efficiency of the radio-frequency amplifier is not substantially degraded as the power level for the output signal is changed.

Abstract translation: 射频放大器（50）具有阻抗变换网络（66），其具有用于控制变换网络（66）的变换特性的控制输入（70）。 射频放大器（50）放大输入信号以产生对负载（68）的放大的射频输出信号。 控制电路响应于控制信号，通过将负载的阻抗变换为在射频放大器的输出处的变换阻抗来选择输出信号的功率电平，使得射频放大器的效率 随着输出信号的功率电平改变，基本上不会劣化。

公开(公告)号：WO1989006476A1

公开(公告)日：1989-07-13

申请号：PCT/US1988004440

申请日：1988-12-13

Applicant: MOTOROLA, INC.

Inventor： MOTOROLA, INC. ,  SIWIAK, Kazimierz ,  JASINSKI, Leon ,  STEEL, Francis, Robert (deceased)

IPC: H04Q07/00

CPC classification number: H04W84/025

Abstract: An acknowledge back (ack-back) paging system (100) is provided which includes a central station (110) which transmits a group of message signals to a group of ack-back pagers (121, 122, ...) which are addressed as a group. The users of the group of addressed ack-back pagers indicate a response to their respective pagers thus providing ack-back data. The pagers in the group of addressed ack-back pagers (121, 122, ...) then simultaneously transmit back to the central station (110) their ack-back data on different frequency subbands, a different frequency sub-band being allocated to each of the pagers (121, 122, ...) in the group.