Title:
【発明の名称】増幅器配置方法およびその方法を使用した装置
Document Type and Number:
Japanese Patent JP2003523123
Kind Code:
A
Abstract:
Limiting amplifier (116) removes amplitude variations from the input signal (110). Splitter (120) provides the constant amplitude signal to each of amplifiers (124A to 124H) via a respective switch (122A to 122H). The envelope of the input signal (110) is detected at (134) and digitized at (138). The bits of the digitized envelope signal are used to control switches (122A to 122H). The output ratings of amplifiers (124A to 124H) form a series wherein each successive output rating is twice the preceding one. Thus, the bits of the digitized envelope signal can be used to reconstruct the envelope of the output signal provided by combiner (126). Several of the amplifiers may be replaced by a single amplifier to simplify the circuit (210, FIGS. 2 and 3). The input signal may be digital removing the need for envelope detection (FIG. 4). Errors in the output may be compensated using a feedback mechanism (FIGS. 5 and 6).
Inventors:
Kennington, Peter
Application Number:
JP2001559137A
Publication Date:
July 29, 2003
Filing Date:
January 29, 2001
Export Citation:
Assignee:
Wireless Systems International Limited
International Classes:
H03F1/02; H03F3/21; H03F3/217; H03M1/74; H03F1/32; (IPC1-7): H03F1/02; H03F1/32; H03F3/21
Attorney, Agent or Firm:
Takashi Ishida (4 others)