CN101699766A - Method for enhancing linearity and efficiency of radio-frequency power amplifier - Google Patents
Method for enhancing linearity and efficiency of radio-frequency power amplifier Download PDFInfo
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- CN101699766A CN101699766A CN200910193257A CN200910193257A CN101699766A CN 101699766 A CN101699766 A CN 101699766A CN 200910193257 A CN200910193257 A CN 200910193257A CN 200910193257 A CN200910193257 A CN 200910193257A CN 101699766 A CN101699766 A CN 101699766A
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Abstract
The invention relates to the field of radio-frequency power amplifiers, in particular to a method for enhancing linearity and efficiency of a radio-frequency power amplifier, which is realized in a way that: a capacitor is connected to the output end of the radio-frequency power amplifier, and the other end of the capacitor is connected to the ground. As the output end of the radio-frequency power amplifier is connected with the capacitor which is connected with the ground in parallel, the radio-frequency power amplifier is in the Class-F operating state. The capacitor can reduce the even harmonic impedance of the output end of the radio-frequency power amplifier and enhance the odd harmonic impedance; and the change of the harmonic impedance can affect the amplitude-amplitude distortion and the amplitude-phase distortion of the radio-frequency power amplifier as well as the voltage waveform and the current waveform of the output signal, thereby enhancing the linearity and the efficiency of the radio-frequency power amplifier. The method can have the same effect as an LC harmonic oscillation network, eliminates the influence on the efficiency of the radio-frequency power amplifier due to low inductance Q value in the LC harmonic oscillation network, and has the advantages of simple and easy implementation and low cost.
Description
Technical field
The present invention relates to the radio-frequency power amplifier technical field, specifically be meant to be used for a kind of method that the radio-frequency power amplifier periphery is used to improve linearity of radio-frequency power amplifier and efficient.
Background technology
In the wireless transmission process, the decay of signal is very fast, and this decay will influence the transmission range of signal, and in order to realize the signal transmission of farther distance, signal is launched after need amplifying through radio-frequency power amplifier usually again.
In wireless transmitting system, requirement to radio-frequency power amplifier mainly contains two aspects: the first, amplify the back for fear of signal through radio-frequency power amplifier and produce obvious distortion, and the signal after avoiding amplifying produces obviously adjacent channel and disturbs, and the linearity of radio-frequency power amplifier need satisfy the certain standard requirement; The second, the radio-frequency power amplifier main dissipative cell in the portable terminal normally, thereby the efficient of radio-frequency power amplifier is very crucial, the power loss that reduces radio-frequency power amplifier itself promptly improves efficiency of RF power amplifier, not only help saving the energy, can reduce the requirement of system simultaneously heat dissipation design.
But the linearity and the efficient that improve radio-frequency power amplifier are conflicting often, and the efficient of promptly improving radio-frequency power amplifier after the linearity can variation, can variation and improve the linearity of radio-frequency power amplifier after the efficient.For example, the conventional method of raising linearity of radio-frequency power amplifier mainly contains power roll-back method, feed forward approach and pre-distortion method.Wherein the power roll-back method directly adopts the method for back-off to improve the linearity, and this method implements very simple, but can cause the efficient of radio-frequency power amplifier obviously to descend.With respect to the power roll-back method, the efficient of radio-frequency power amplifier can be high behind employing feed forward approach and the pre-distortion method, but these two kinds of methods implement relatively complicated, cost is higher, and adopting after these two kinds of methods the linearity of radio-frequency power amplifier relevant with conditions of work such as its working temperature, supply voltage and input powers, operation conditions change might cause its linearity rapid deterioration.Also has a kind of method that improves linearity of radio-frequency power amplifier and efficient at present, it increases the harmonic impedance that a LC resonant network is regulated the radio-frequency power amplifier output by the output at radio-frequency power amplifier, and the change of harmonic impedance can influence the amplitude-amplitude distortion and the amplitude-phase distortion of radio-frequency power amplifier, thereby reaches the purpose of regulating linearity of radio-frequency power amplifier; Regulating harmonic impedance simultaneously makes the electric current that flows through above it when the voltage on the transistor in the radio-frequency power amplifier reaches maximum be controlled to minimum value, can reduce the power loss of transistor self like this, thereby reach the purpose that improves efficiency of RF power amplifier.As shown in Figure 1, be the raising linearity of radio-frequency power amplifier of increase and the LC resonant network of efficient in the frame of broken lines, wherein L1, C1 and L2, C2 difference resonance are in second order and quadravalence harmonic frequency place, thereby reduce the second order and the quadravalence harmonic impedance of radio-frequency power amplifier output, improve the harmonic impedance at three rank and five rank place simultaneously, make that the voltage of radio-frequency power amplifier output is the opposite approximate square wave of phase place with current waveform, to reach the purpose that improves efficiency of RF power amplifier.L1, C1 in the method requirement resonant network of this raising linearity of radio-frequency power amplifier and efficient and L2, C2 difference resonance are in second order and quadravalence harmonic frequency place, thereby it is very high to the required precision of inductance capacitance value, and because resonant network is located immediately at the output of radio-frequency power amplifier, the limited Q value of resonant network directly affects the efficient of radio-frequency power amplifier.In sum, all there is problem in varying degrees in the method for improving linearity of radio-frequency power amplifier and efficient at present, still needs a kind ofly effectively can improve linearity of amplifier degree and efficient and simple method simultaneously.
Summary of the invention
The problem that the present invention need solve provides a kind of method that simply and effectively can improve linearity of radio-frequency power amplifier and efficient simultaneously, and this method is not high to the required precision of element, thereby convenient in the debugging of radio-frequency power amplifier.
For addressing the above problem, the technical solution used in the present invention is: a kind of method that improves linearity of radio-frequency power amplifier and efficient promptly connects an electric capacity at described radio-frequency power amplifier output, electric capacity other end ground connection.
Further, connect another electric capacity, electric capacity other end ground connection at the radio-frequency power amplifier inter-stage.
Export the electric capacity that termination is linked to ground in the lump at radio-frequency power amplifier, make radio-frequency power amplifier be in F class operating state.This electric capacity can reduce the even-order harmonic impedance of radio-frequency power amplifier output, improve the odd harmonic impedance that radio-frequency power amplifies output simultaneously, the change of harmonic impedance can influence the amplitude-amplitude distortion and the amplitude-phase distortion of radio-frequency power amplifier, thereby reaches the purpose that improves linearity of radio-frequency power amplifier; The change of harmonic impedance simultaneously can influence the voltage waveform and the current waveform of output signal, after the output increase of radio-frequency power amplifier is parallel to the electric capacity on ground, the voltage current waveform of radio-frequency power amplifier output is shaped as approximate square wave (wherein current waveform is a half-wave), and voltage is opposite with the phase place of current waveform, like this when the voltage on the transistor in the radio-frequency power amplifier reaches maximum and the electric current that flows through above it is controlled to minimum value, can reduce the power loss of transistor self like this, thereby reach the purpose that efficiency of RF power amplifier is provided.
Compared with prior art, beneficial effect of the present invention is:
Described method only need increase an electric capacity that is parallel to ground at the output of radio-frequency power amplifier and get final product, this electric capacity can play the effect identical with the LC resonant network, and has eliminated the not high influence to efficiency of RF power amplifier of inductance Q value in the LC resonant network; And the required precision to described electric capacity is not high, simple, and cost is low.
Description of drawings
Fig. 1 increases the circuit diagram that the LC resonant network improves linearity of radio-frequency power amplifier and efficient for existing at the radio-frequency power amplifier output;
Fig. 2 is of the present invention to increase electric capacity to improve the circuit diagram of linearity of radio-frequency power amplifier and efficient at the radio-frequency power amplifier output;
Fig. 3 is of the present invention all to increase the circuit diagram that electric capacity improves linearity of radio-frequency power amplifier and efficient at radio-frequency power amplifier inter-stage and output.
Embodiment
For the ease of it will be appreciated by those skilled in the art that the present invention is described in further detail below in conjunction with drawings and Examples.
Fig. 2 is first kind of preferred circuit diagram of implementing of the present invention.It increases an electric capacity that is parallel to ground by the output at radio-frequency power amplifier and regulates the harmonic impedance of radio-frequency power amplifier output, thereby reaches the purpose that improves linearity of radio-frequency power amplifier and efficient.As shown in Figure 2, input signal is connected to radio-frequency power amplifier PA input, the PA output is exported signal by matching network, one end of capacitor C 1 is connected to the output of radio-frequency power amplifier PA, other end ground connection, the output of inductance L 1 one termination radio-frequency power amplifier PA, the other end links to each other with power supply VCC.Radio-frequency power amplifier PA is used for input signal is amplified, matching network is used for converting load impedance to a lower impedance to improve the power output capacity of radio-frequency power amplifier, inductance L 1 plays choking effect, capacitor C 1 is used to regulate the harmonic impedance of radio-frequency power amplifier output, thereby make radio-frequency power amplifier be in F class operating state, it can reduce the even-order harmonic impedance of radio-frequency power amplifier output, improve the odd harmonic impedance that radio-frequency power amplifies output simultaneously, the change of harmonic impedance can influence the amplitude-amplitude distortion and the amplitude-phase distortion of radio-frequency power amplifier, thereby reaches the purpose that improves linearity of radio-frequency power amplifier; The change of harmonic impedance simultaneously can influence the voltage waveform and the current waveform of output signal, after the output increase of radio-frequency power amplifier PA is connected to the capacitor C 1 on ground, the voltage current waveform of radio-frequency power amplifier output is shaped as approximate square wave (wherein current waveform is a half-wave), and voltage is opposite with the phase place of current waveform, the electric current that flows through above it when the voltage on the transistor in the radio-frequency power amplifier reaches maximum is controlled to minimum value, can reduce the power loss of transistor self like this, thereby reach the purpose that efficiency of RF power amplifier is provided.
Required precision to capacitor C 1 in this programme is not high, is convenient to the debugging to radio-frequency power amplifier.During concrete enforcement, the value of described capacitor C 1 changes according to desired load impedance size of radio-frequency power amplifier PA output and operating frequency.As the load impedance that requires hour, then the value of electric capacity requires relatively large; When the load impedance that requires was big, then the value of electric capacity required to want littler; And the value of electric capacity requires more little when operating frequency is high more.
Fig. 3 is second kind of preferred circuit diagram of implementing of the present invention.It regulates the harmonic impedance of radio-frequency power amplifier output by all increasing an electric capacity that is parallel to ground at the inter-stage of radio-frequency power amplifier and output, thereby improves linearity of radio-frequency power amplifier and efficient simultaneously.As shown in Figure 3, amplifier PA1 is connected between input signal and the matching network 1, the other end of matching network 1 links to each other with the input of amplifier PA2, matching network 2 is connected between the output and output signal of PA2, one end of capacitor C 1 and the output of PA1 with and choke induction L1 link to each other, the other end of capacitor C 1 links to each other with ground, the other end of inductance L 1 is connected with power supply VCC1, one end of capacitor C 2 links to each other with the output of PA2 and choke induction L2 one end, the other end of capacitor C 2 links to each other with ground, the other end of inductance L 2 links to each other with power supply VCC2, wherein PA1 is used for input signal is carried out first order amplification, the impedance transformation that matching network 1 is used for seeing into from the PA2 input becomes a higher impedance, to improve the gain of radio-frequency power amplifier, PA2 is used for the signal after amplifying through PA1 is amplified once more, matching network 2 is used for converting load impedance to a lower impedance to improve the power output capacity of radio-frequency power amplifier, capacitor C 1, C2 is used to regulate the harmonic impedance of the radio-frequency power amplifier first order and second level output, thereby make radio-frequency power amplifier PA1, PA2 all is in F class operating state, it can reduce the even-order harmonic impedance of radio-frequency power amplifier inter-stage and output, improve the odd harmonic impedance, the change of harmonic impedance can influence the amplitude-amplitude distortion and the amplitude-phase distortion of radio-frequency power amplifier, thereby reaches the purpose that improves linearity of radio-frequency power amplifier; The change of same harmonic impedance also can influence the voltage waveform and the current waveform of output signal, after the inter-stage of radio-frequency power amplifier and output increase are parallel to the electric capacity on ground, the voltage current waveform of radio-frequency power amplifier output is shaped as approximate square wave (wherein current waveform is a half-wave), and voltage is opposite with the phase place of current waveform, the electric current that flows through above it when the voltage on the transistor in the radio-frequency power amplifier reaches maximum is controlled to minimum value, can reduce the power loss of transistor self like this, thereby reach the purpose that efficiency of RF power amplifier is provided.When physical circuit was implemented, capacitor C 1 was not fixed with respect to the position of matching network 1, and regulated harmonic impedance and can use separately yet at the electric capacity that the inter-stage utilization is parallel to ground.
The value of capacitor C 1, C2 does not repeat them here with embodiment one in the foregoing description.
Need to prove, conceive under the prerequisite its any minor variations of doing and be equal to replacement not breaking away from the present invention, all should belong to protection scope of the present invention.
Claims (2)
1. a method that improves linearity of radio-frequency power amplifier and efficient is characterized in that: connect an electric capacity at described radio-frequency power amplifier output, electric capacity other end ground connection.
2. RF power amplifier intervalve matching circuit according to claim 1 is characterized in that: further, connect another electric capacity at the radio-frequency power amplifier inter-stage, electric capacity other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN200910193257A CN101699766A (en) | 2009-10-22 | 2009-10-22 | Method for enhancing linearity and efficiency of radio-frequency power amplifier |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910193257A CN101699766A (en) | 2009-10-22 | 2009-10-22 | Method for enhancing linearity and efficiency of radio-frequency power amplifier |
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| CN101699766A true CN101699766A (en) | 2010-04-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105305982A (en) * | 2015-12-09 | 2016-02-03 | 韦晓娟 | Electronic valve feedback-free low-distortion audio amplifier |
-
2009
- 2009-10-22 CN CN200910193257A patent/CN101699766A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105305982A (en) * | 2015-12-09 | 2016-02-03 | 韦晓娟 | Electronic valve feedback-free low-distortion audio amplifier |
| CN105305982B (en) * | 2015-12-09 | 2018-01-23 | 韦晓娟 | Electron tube feedback-less low distortion audio amplifier circuit |
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Open date: 20100428 |