Title:
選択された位相長および出力インピーダンスを用いた増加されたバックオフ能力および電力付加効率を持つNウェイRF電力増幅器回路
Document Type and Number:
Japanese Patent JP4974673
Kind Code:
B2
Abstract:
An RF power amplifier circuit for amplifying an RF signal over a broad range of power with improved efficiency includes a carrier amplifier for amplifying an RF signal over a first range of power and with a power saturation level below the maximum of the broad range of power is disclosed. A plurality of peak amplifiers are connected in parallel with the carrier amplifier with each of the peak amplifiers being biased to sequentially provide an amplified output signal after the carrier amplifier approaches saturation. The input signal is applied through a signal splitter to the carrier amplifier and the plurality of peak amplifiers, and an output for receiving amplified output signals from the carrier amplifier and the plurality of peak amplifiers includes a resistive load R/2. The split input signal is applied through a 90° transformer to the carrier amplifier, and the outputs of the peak amplifiers are applied through 90° transformers to a output load. When operating below saturation, the carrier amplifier delivers power to a load of 2R and the carrier amplifier delivers current to the load, which is one-half the current at maximum power when the amplifier is saturated. In one embodiment with the output having an impedance, Z, the carrier amplifier and each peak amplifier is connected to the output through an output-matching network presenting an output impedance of less than Z to each amplifier and with each output-matching network having selected phase length to reduce reactance of the output impedance.
Inventors:
Penguly Raymond Sydney
Wood Simon Maurice
Wood Simon Maurice
Application Number:
JP2006510016A
Publication Date:
July 11, 2012
Filing Date:
April 08, 2004
Export Citation:
Assignee:
CREE INC.
International Classes:
H03F1/07; H03F3/68; H03F1/02; H03F1/32; H03F3/24; H03F3/60
Domestic Patent References:
| JP7022852A | ||||
| JP2001502493A | ||||
| JP2000513535A |
Foreign References:
| US6262629 | ||||
| WO2001095481A1 |
Other References:
Y.Yangetal,A Fully Matched N-way Doherty Amplifier with Optimized Linearity,IEEE Trans. Microwave Theory and Tech.,米国,IEEE,2003年 3月,Vol.51、 No.3,986-993
Attorney, Agent or Firm:
Sadao Kumakura
Fumiaki Otsuka
Takaki Nishijima
Hiroyuki Suda
Fumiaki Otsuka
Takaki Nishijima
Hiroyuki Suda