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High frequency power amplifier

A technology for power amplifiers and amplifiers, applied in amplifiers, amplifier combinations, improving amplifiers to improve efficiency, etc., can solve problems such as amplifier efficiency reduction, and achieve the effect of preventing electric power from being wasted

Inactive Publication Date: 2003-01-01
SONY GRP CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because the efficiency of the DC-DC converter is at most about 80%, so even if the FET is operating at its saturation state close to 100% efficiency, the efficiency of the entire amplifier is reduced to 80% due to the efficiency of the DC-DC converter

Method used

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Embodiment Construction

[0022] The high-frequency power amplifier according to the present invention is described below with reference to the accompanying drawings.

[0023] The present invention relates to a high-frequency power amplifier, the output power of which can be continuously controlled by changing the drain voltage of a switch drive transistor. The present invention has been devised to better improve amplifier efficiency compared to conventional amplifiers using a similar approach.

[0024] Various situations in which the output of a high frequency power amplifier needs to be continuously controlled can be considered. Next, a case where continuous control is applied to a high-frequency power amplifier of an antenna output stage of a communication device for digital mobile communication such as a cellular phone or the like is shown as a suitable example. Here, examples are given and their details are described as follows. In this case, the output power of the high-frequency power amplifie...

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Abstract

The present invention relates to a high frequency power amplifier adopting the switching-driver EFTs. Said frequency power amplifier is provided with a plurality of amplifiers connected in parallel, the amplifiers including switching-driven FET's. A fixed drain voltage is applied to one amplifier and variable drain voltage is applied to another amplifier through a section including a DC-DC converter or the like that converts the voltage according to a control value of a control signal. The turning on and off of the operation of the power amplifier is controlled by a control signal. Also, the circuit constants of a matching circuit are variable. In a high output power region, the power amplifier is turned on and in a low output power region, turned off. Thereby, the decrease of efficiency of the power amplifier, owing to the DC-DC converter, may be suppressed to a minimum. The matching of the amplifier is adjusted when the power amplifier is switched on or off so as to improve efficiency. Consequently, it becomes possible to continuously control the output of the amplifier.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from Japanese Patent Application JP 2001-161918 filed May 30, 2001, the disclosure of which is incorporated herein by reference to the extent permitted by law. technical field [0003] The present invention relates to a high-frequency power amplifier using a switch-driven transistor, and more particularly, to a high-frequency power amplifier that allows continuous control of power output and improves amplification efficiency. Background technique [0004] High-frequency power amplifiers are generally used as amplifiers for antenna output stages of communication devices and the like. There are many amplifiers having various characteristics, and among these amplifiers, an amplifier having high efficiency is particularly suitable for use in a transmission section of a communication device terminal for digital mobile communication using a digital cellular phone or the like. The characteris...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/68H03F1/02H03F3/217H03G1/00
CPCH03F3/211H04B1/0458H03F1/56H03F2200/387H03F2200/421H03G1/0088H03F2203/21175H03F2203/21157H03F1/0238H04B1/0483H03F2200/391
Inventor 晴山信夫
Owner SONY GRP CORP
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