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High-efficiency amplifier

An amplifier and high-efficiency technology, which is applied to high-frequency amplifiers, amplifiers, and improved amplifiers to improve efficiency. It can solve problems such as linear variation and peak amplifier linear variation, and achieve the effect of improving linearity and efficiency.

Inactive Publication Date: 2007-03-28
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem of linearity degradation of the peaking amplifier
In addition, because the carrier amplifier is designed to operate near the maximum efficiency point near saturation, there is a problem of linearity degradation
In addition, when the instantaneous signal level of the RF signal is higher than the specified level, there is a problem that the efficiency of the carrier amplifier exceeds the maximum efficiency and falls instead.

Method used

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Examples

Experimental program
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Effect test

Embodiment approach 1

[0032] FIG. 1 is a configuration diagram showing a high-efficiency amplifier according to Embodiment 1 of the present invention.

[0033] In the figure, the input-side branch circuit 2, for example, receives an RF signal (input signal) from the input terminal 1, branches the RF signal, and outputs it to two lines. Also, the input side branch circuit 2 constitutes an input signal branch unit.

[0034] The carrier amplifier 3 , which is the first amplifier, amplifies one RF signal branched by the input side branch circuit 2 , and outputs the amplified RF signal to the 1 / 4 wavelength line 4 .

[0035] The analog predistortion circuit 5 is connected between the input side branch circuit 2 and the 1 / 4 wavelength line 6 and is a distortion compensation circuit for compensating the nonlinear distortion of the peak amplifier 7 .

[0036] The peak amplifier 7, which is the second amplifier, amplifies the RF signal when the signal level (power) of the RF signal passing through the 1 / 4 ...

Embodiment approach 2

[0054] 3 is a configuration diagram showing a high-efficiency amplifier according to Embodiment 2 of the present invention. In the drawings, since the same symbols as those in FIG. 1 denote the same or corresponding parts, description thereof will be omitted.

[0055] The analog predistortion circuit 11 is connected between the input side branch circuit 2 and the carrier amplifier 3 , and is a distortion compensating circuit for compensating nonlinear distortion of the carrier amplifier 3 .

[0056] In Embodiment 1 above, the analog predistortion circuit 5 is connected between the input side branch circuit 2 and the 1 / 4 wavelength line 6 to show an example of compensating the non-linear distortion of the peak amplifier 7, and it may further be set so that An analog pre-compensation circuit 11 is connected between the side branch circuit 2 and the carrier amplifier 3 to compensate the nonlinear distortion of the carrier amplifier 3 .

[0057] This provides an effect of further...

Embodiment approach 3

[0059] FIG. 4 is a configuration diagram showing a high-efficiency amplifier according to Embodiment 3 of the present invention. In the drawings, since the same symbols as those in FIG. 1 denote the same or corresponding parts, description thereof will be omitted.

[0060] The limiter circuit 12, which is a level limiter circuit, limits the amplitude of the RF signal below a specified level when the amplitude of an RF signal branched by the input side branch circuit 2 rises above a specified level, and outputs it to the carrier. Amplifier 3.

[0061] The phase modulation circuit 13 adjusts the RF signal so that the passing phase of the RF signal before being output through the carrier amplifier 3 is consistent with the passing phase before being output through the peak amplifier 7 .

[0062] The operation will be described below.

[0063] The limiter circuit 12, which is a level limiter circuit, has a saturation characteristic by which the amplitude level of the RF signal is...

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Abstract

An analog pre-distortion circuit (5) is connected between an input-side branching circuit (2) and a quarter-wavelength line (6). This compensates for the nonlinear distortion of a peak amplifier (7), with the result that the linearity of the whole amplifier can be improved.

Description

technical field [0001] The present invention relates to, for example, high-efficiency linear amplification of a high-efficiency amplifier for RF (Radio Frequency: radio frequency) signals. Background technique [0002] RF amplifiers for broadcasting and communication are desired to efficiently and linearly amplify an RF signal which is an input signal. [0003] However, generally in amplifiers, improving efficiency and improving linearity cannot be achieved at the same time. [0004] The efficiency of an amplifier increases as the power level of the input signal increases, with the amplifier achieving maximum efficiency near saturation. In addition, in a region where the power of the input signal further increases and is completely saturated, the efficiency has a characteristic of decreasing on the contrary. [0005] In recent years, when the PAPR (Peak to Average Power Ratio) large modulation wave used in broadcasting and mobile communications is input to the amplifier, c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/07H03F1/32H03F3/19H03F1/02
CPCH03F1/0288H03F1/3276
Inventor 堀口健一中山正敏高木直
Owner MITSUBISHI ELECTRIC CORP