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Transmitter

A technology of transmitter and modulated wave, which is applied in the direction of modulated carrier system, transmission system, gain control, etc.

Inactive Publication Date: 2005-06-08
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in the conventional EER technology, although the efficiency is improved by changing the voltage applied to the drain terminal or the collector terminal in synchronization with the amplitude component, the voltage applied to the base terminal or the gate terminal of the high-frequency power amplifier is kept constant, thereby Fixed the operation type of high-frequency power amplifier

Method used

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Comparison scheme
Effect test

Embodiment 1

[0034] figure 1 is a circuit block diagram of an exemplary configuration of a transmitter implementing the EER technology according to Embodiment 1 of the present invention. figure 1 The shown transmitter includes an OFDM signal generation unit 101 as a modulated wave signal generation unit; a phase / amplitude separation unit 102; a first voltage conversion unit 103 and a second voltage conversion unit 104, each voltage conversion unit from A phase / amplitude separation unit 102 receives an amplitude component as an input voltage, and changes an output voltage level according to the voltage level of the amplitude component; a high-frequency power amplifier 105, which has a base terminal or a gate terminal, and a collector terminal or a drain terminal , the output voltage of the first voltage conversion unit 103 is applied to the base terminal or the gate terminal, and the output voltage of the second voltage conversion unit 104 is applied to the collector terminal or the drain...

Embodiment 2

[0053] figure 2 is a circuit block diagram of an exemplary configuration of a transmitter implementing the EER technology according to Embodiment 2 of the present invention. Note here that in figure 2 In , the same reference numerals as in Embodiment 1 refer to the same components, and their descriptions are omitted.

[0054] Such as figure 2 As shown, the difference between the transmitter in this embodiment and Embodiment 1 is that the modulated wave signal output by the OFDM signal generating unit 101 is directly provided to the quadrature modulator 106, and the amplitude component generating unit 108 is used to generate the modulated wave signal from the modulated wave signal The amplitude component is extracted, thereby eliminating the phase / amplitude separation unit 102.

[0055] According to this configuration, not the phase component but the modulated wave signal itself is used as the input signal of the quadrature modulator 106 . Therefore, a reduction in modul...

Embodiment 3

[0064] Figure 3A , Figure 3B and Figure 3C is the first voltage converting unit 103 ( figure 1 and figure 2 Graphs of specific exemplary operations of ). Figure 4A , Figure 4B and Figure 4C is a graph used to illustrate the operation of a conventional transmitter. In the following description, the operation of the conventional transmitter will be explained first, and then the operation of the transmitter according to this embodiment will be explained.

[0065] The efficiency of high-frequency power amplifiers varies as follows according to the type of operation: in ideal conditions, the maximum efficiency of type A operation is 50%, the maximum efficiency of type B operation is 78.5%, and the gain of type B operation is 6dB lower than that of type A operation . Therefore, generally considering the characteristics of efficiency and gain, type AB is selected as the operation type of many high-frequency power amplifiers.

[0066] In this embodiment, in order to e...

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Abstract

In the range (R3), the amplitude component voltage (VA) of the modulated wave signal from the OFDM signal generation unit is equivalent to the average output power, and the output voltage (voltage applied to the base or gate) of the first voltage conversion unit is fixed , so that the high frequency power amplifier performs Type AB operation. In the range (R4), VA is greater than VA in R3, the output voltage of the first voltage conversion unit increases, thereby changing the operation type of the high frequency power amplifier from type AB to type A. In the range (R2), VA is smaller than VA in R3, the output voltage of the first voltage conversion unit is lowered, thereby changing the operation type of the high frequency power amplifier from type AB to type B. The efficiency at the average power time is improved without reducing the maximum output power of the high frequency power amplifier in the transmitter.

Description

field of invention [0001] The present invention relates to wireless transmitters. Background technique [0002] Generally, in a modulated signal including amplitude modulation, particularly in multi-value modulation such as QAM (Quadrature Amplitude Modulation), a high-frequency power amplifier that transmits electric power to an antenna requires a linear operation. For this reason, type A or type AB is used as the operation type of the high-frequency power amplifier. [0003] However, in accordance with changes in communication broadband, a communication technique utilizing multiple carriers such as OFDM (Orthogonal Frequency Division Multiplexing) has come to be used. Also, conventional high-frequency power amplifiers operating in Type A and Type AB do not have high efficiency. That is, in OFDM, due to overlapping of subcarriers, large electric powers appear instantaneously and completely randomly, and the ratio of average power to instantaneous maximum power or PAPR (Pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G3/30H04B1/02H04B1/04H04L27/26H04L27/36H05B41/16H05B41/24
CPCH04L27/2614H04L27/2626
Inventor 秋月泰司田边充田中宏一郎
Owner PANASONIC CORP