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Doherty amplifier and amplification circuit

A technology of Doherty amplifiers and carrier amplifiers, applied in amplifiers, amplifier types, radio frequency amplifiers, etc., can solve the problems of linear degradation of input and output characteristics, power efficiency reduction, etc., and achieve the goal of suppressing useless power consumption and power efficiency reduction Effect

Pending Publication Date: 2020-03-31
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] When amplifying elements such as FETs (Field Effect Transistor: Field Effect Transistors) operate with large signals operating near the saturation region, the power efficiency is good, but the linearity of the input and output characteristics deteriorates
[0003] In addition, when the amplifying element operates in a small-signal operation in a power region lower than the saturation region, the linearity of the input and output characteristics is good, but there is a problem that the power efficiency is lowered.

Method used

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  • Doherty amplifier and amplification circuit
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  • Doherty amplifier and amplification circuit

Examples

Experimental program
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Effect test

Embodiment approach 1

[0035] figure 1 It is a configuration diagram showing a Doherty amplifier according to Embodiment 1 of the present invention.

[0036] exist figure 1 In , the input terminal 1 is a terminal to which the signal to be amplified is input.

[0037] In Embodiment 1, an example in which the signal to be amplified is a digital signal is described. However, when the signal to be amplified is an analog signal, the digital-to-analog converters 3 and 4 are unnecessary.

[0038] exist figure 1 In , the digital-to-analog converters 3 and 4 are represented as "DAC".

[0039] The signal distributor 2 is a distributor that distributes the digital signal D input from the input terminal 1, and is realized by, for example, a digital signal processor (DSP:Digital Signal Processor).

[0040] Specifically, the signal distributor 2 compares the power P of the digital signal D input from the input terminal 1 and the threshold value P set in advance. th Compare.

[0041] If the power P of the di...

Embodiment approach 2

[0114] In Embodiment 1 described above, an example was shown in which the phase adjuster 7 has the inductance element 11 , the first variable capacitance element 12 , and the second variable capacitance element 13 .

[0115] In Embodiment 2, an example in which the phase adjuster 7 has the first inductance element 21 , the second inductance element 22 and the variable capacitance element 23 will be described.

[0116] Figure 6 It is a configuration diagram showing the phase adjuster 7 of the Doherty amplifier according to Embodiment 2 of the present invention.

[0117] exist Figure 6 Here, the first inductance element 21 is an inductor, and one end thereof is connected to the output side of the carrier amplifier 6 .

[0118] The second inductance element 22 is an inductor, one end of which is connected to the other end of the first inductance element 21 , and the other end is connected to one input side of the signal combiner 9 .

[0119] The variable capacitance element ...

Embodiment approach 3

[0132] In Embodiment 1 described above, an example was shown in which the phase adjuster 7 has the inductance element 11 , the first variable capacitance element 12 , and the second variable capacitance element 13 .

[0133] In Embodiment 2, an example in which the phase adjuster 7 has the transmission line 31 , the first variable capacitance element 32 , and the second variable capacitance element 33 will be described.

[0134] Figure 7 It is a configuration diagram showing the phase adjuster 7 of the Doherty amplifier according to Embodiment 3 of the present invention.

[0135] exist Figure 7 Among them, the transmission line 31 is a line whose one end is connected to the output side of the carrier amplifier 6 and the other end is connected to one input side of the signal synthesizer 9 .

[0136]The first variable capacitance element 32 is a variable capacitor, one end of which is connected to the output side of the carrier amplifier 6 and the other end is grounded.

[...

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Abstract

In the present invention, a signal distributor (2) outputs one signal to a carrier amplifier (6), and another signal with a 90-degree phase delay from that of the one signal to a peak amplifier (8), and adjusts a signal phase shift amount of a phase shifter (7) in accordance with the frequency of a signal to be amplified when the power level of the signal to be amplified is equal to or higher thana threshold value, or outputs the one signal to the carrier amplifier (6) without outputting the other signal to the peak amplifier (8) when the power level of the signal to be amplified is lower than the threshold value.

Description

technical field [0001] The present invention relates to a Doherty amplifier and an amplifying circuit for amplifying a signal to be amplified. Background technique [0002] When an amplifying element such as a FET (Field Effect Transistor: Field Effect Transistor) operates in a large-signal operation near the saturation region, the power efficiency is good, but the linearity of the input-output characteristic deteriorates. [0003] In addition, when the amplifying element operates in a small-signal operation in a power region lower than the saturation region, the linearity of the input-output characteristic is good, but there is a problem that the power efficiency is lowered. A Doherty amplifier is known as an amplifier that resolves this problem. [0004] The Doherty amplifier disclosed in Patent Document 1 below has the following elements (1) to (7). [0005] (1) Splitter that distributes the signal to be amplified to two signals [0006] (2) A carrier amplifier that am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/07
CPCH03F1/0288H03F2200/451H03F3/211H03F3/602H03F2200/411H03F2200/378H03F2200/546H03F2200/543H03F2203/21106H03F2203/21142H03F3/604
Inventor 中谷圭吾坂田修一新庄真太郎山中宏治
Owner MITSUBISHI ELECTRIC CORP