CN102969986A - Output circuit structure of radio frequency power amplifier - Google Patents
Output circuit structure of radio frequency power amplifier Download PDFInfo
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- CN102969986A CN102969986A CN2012104691211A CN201210469121A CN102969986A CN 102969986 A CN102969986 A CN 102969986A CN 2012104691211 A CN2012104691211 A CN 2012104691211A CN 201210469121 A CN201210469121 A CN 201210469121A CN 102969986 A CN102969986 A CN 102969986A
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Abstract
The invention relates to an output circuit structure of a radio frequency power amplifier, and the output circuit structure comprises a secondary harmonic resonance network, a tertiary third harmonic resonance network and a parallel-connection fundamental wave resonance network of a drain-source capacitor. Meanwhile, the secondary harmonic resonance network is combined with the feed circuit, so that not only can a filter effect on the second harmonics be satisfied, but also an alternative-current signal of the feed circuit is free fromdoes not influencinge a power supply effect of a direct-current power supply on a leak.
Description
Technical field
The invention belongs to the output circuit field of radio-frequency power amplifier, especially a kind of output circuit structure that improves radio-frequency current power amplifier service behaviour.
Background technology
In the wireless transmission process, the decay of signal is very fast, and this decay will affect the transmission range of signal, and in order to realize more remote signal transmission, signal normally needs through launching after the radio-frequency power amplifier amplification again.
In wireless transmitting system, the requirement of radio-frequency power amplifier is mainly contained two aspects; The first, produce obvious distortion after signal amplifies through radio-frequency power amplifier, and the signal after avoiding amplifying produces obviously to adjacent channel and disturb, the linearity of radio-frequency power amplifier need to satisfy certain standard-required; The second, the radio-frequency power amplifier main dissipative cell in the portable terminal normally, therefore the efficient of radio-frequency power amplifier is very crucial, the power loss that reduces radio-frequency power amplifier itself namely improves efficiency of RF power amplifier, not only had and the saving energy, can reduce system to the requirement of heat dissipation design simultaneously.
For the designer of radio-frequency power amplifier, the problem that mainly runs at present have following some:
The first, also there is every harmonic wave in the nonlinear characteristic of radio-frequency power amplifier simultaneously so that output not only comprises fundamental signal, and the harmonic amplitude size becomes certain proportionate relationship with the fundamental signal size.In power amplifier, because fundamental power is larger, so harmonic power is also larger, particularly second harmonic and triple-frequency harmonics, and they be can not ignore the impact of system.
The second, at the feed end of radio-frequency power amplifier, need feed circuit that the direct current of DC power supply VDD is sent to the drain electrode of amplifier, but radio frequency energy can not flow away from feed end again, because so can lose radio-frequency power, reduce power amplification efficiency; On the other hand, the peak value of radiofrequency signal can form the device of feed end and damage.
Three, because radio-frequency power amplifier need to be operated in the high frequency state, so the drain-source capacitor C ds of amplifier inside can present selecting frequency characteristic to the output signal of radio-frequency power amplifier, thereby output frequency range and the effect efficient of power amplifier have been reduced.
When above-mentioned three problems occur separately, all reported multiple solution in the prior art, as in Chinese patent 200910193257, design resonant network by the output at radio-frequency power amplifier, thereby the harmonic filtration in the signal is improved the linearity of power amplifier.In Chinese patent 201080027856, then proposed a kind ofly at reactance-controlled circuit of radio-frequency power amplifier output design, reduced parasitic capacitance to the loss of output signal by increasing a parasitic capacitance with amplifier element in the reactance of fundamental frequency emission resonance.In Chinese patent 200910197660, then proposed in feed circuit, to increase the microstrip line of λ/4 and λ/8, thereby reduced in the radiofrequency signal first-harmonic and second harmonic to the impact of DC power supply.Yet for the scheme that solves simultaneously above-mentioned three problems, at present also not yet the someone propose.
Summary of the invention
In view of this, the object of the invention is to propose a kind of output circuit structure of radio-frequency power amplifier, this output circuit structure can be simply and is effectively solved simultaneously linearity problems, efficiency and the frequency range problem of power amplifier output signal.
The output circuit structure of a kind of radio-frequency power amplifier that proposes according to purpose of the present invention comprises DC power supply, the first electric capacity, the second electric capacity, the 3rd electric capacity, the first inductance, the second inductance, the 3rd inductance, the 4th inductance and the first microstrip line;
Described the second inductance and the second electric capacity are connected in turn in the drain electrode, and the second capacity earth, and this second inductance and the second electric capacity form the resonant network of adjustable secondary or triple-frequency harmonics;
Described the second inductance, the first inductance and the first electric capacity are connected in turn in the drain electrode, and the first capacity earth, and this second inductance, the first inductance and the first electric capacity form the first-harmonic resonance network in parallel of described drain-source electric capacity;
Described the 3rd inductance, the first microstrip line and the 3rd electric capacity are connected in turn in the drain electrode, and the 3rd capacity earth, and this first microstrip line and the 3rd electric capacity form the resonant network of adjustable secondary or triple-frequency harmonics;
Described the first microstrip line connects DC power supply simultaneously, forms the feed circuit to drain electrode;
Described the 4th inductance is arranged between the resonant network and parallel resonance network of second harmonic, makes the first inductance, the second inductance, the 3rd inductance, the 4th inductance and the first microstrip line form the loop.
Further, described match circuit is connected on the johning knot of described the 3rd inductance and the first microstrip line.
Preferably, further comprise the second microstrip line in the described feed circuit, be connected to the johning knot of DC power supply and the first microstrip line and the 3rd electric capacity.
Preferably, described the 3rd electric capacity is that radio frequency moves back lotus root electric capacity.
Preferably, the resonance frequency of described the first electric capacity makes this series resonant network form open circuit for first-harmonic in drain electrode less than the fundamental frequency in the output signal.
Preferably, the electrical length of described the first microstrip line is λ/4 or less than λ/4, λ is fundamental wavelength.
In the output circuit structure of the radio-frequency power amplifier that the present invention proposes, the resonant network of simultaneously integrated second harmonic and triple-frequency harmonics, and the first-harmonic resonance network in parallel of drain-source electric capacity, just second harmonic and triple-frequency harmonics carry out filtering, improve the linearity in the output signal.Drain-source electric capacity can well be eliminated by the parallel resonance network, so that the frequency range of output signal is improved on fundamental frequency.Simultaneously, the present invention is with secondary and triple-frequency harmonics resonant network and video wave network and feed circuit is creationary combines, when stoping first-harmonic and second harmonic that DC power supply is impacted, so that DC power supply can be powered for power amplifier normally.And the present invention just is being based on the ingenious property of design, for the output circuit structure of realizing above-mentioned sophisticated functions provides a cover simple and effective scheme.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of the radio-frequency power amplifier output circuit of the specific embodiment of the present invention.
Fig. 2 is the comparison diagram of modulation impedance of the present invention and prior art.
Fig. 3 is the comparison diagram of phase linearity of the present invention and prior art.
Embodiment
Just as described in the background art, in the existing radio-frequency power amplifier output circuit structure, often only consider to solve single output problem.And for the Integrated Solution that can solve simultaneously multiple output problem, because the difficulty in the design and the consideration that is in cost control, also nobody proposes at present.
Therefore, the present invention has proposed a kind of output circuit structure with the radio-frequency power amplifier that solves multiple output problem on the basis of existing technology.The resonant network of this output circuit structure is not only integrated second harmonic and triple-frequency harmonics, and the first-harmonic resonance network in parallel of drain-source electric capacity are simultaneously also with the second harmonic resonant network and feed circuit is creationary combines.So that the output circuit structure of radio-frequency power amplifier of the present invention can carry out second harmonic and triple-frequency harmonics filtering and improve video ripple frequency range, and then the linearity in the raising output signal, drain-source electric capacity can well be eliminated by the parallel resonance network on fundamental frequency, so that the first-harmonic frequency range of output signal is improved, simultaneously feed circuit is effectively worked.
The concrete scheme of this radio-frequency power amplifier output circuit structure is: comprise DC power supply, the first electric capacity, the second electric capacity, the 3rd electric capacity, the first inductance, the second inductance, the 3rd inductance, the 4th inductance and the first microstrip line; Described the second inductance and the second electric capacity are connected in turn in the drain electrode, and the second capacity earth, and this second inductance and the second electric capacity form the resonant network of adjustable secondary or triple-frequency harmonics; Described the second inductance, the first inductance and the first electric capacity are connected in turn in the drain electrode, and the first capacity earth, and this second inductance, the first inductance and the first electric capacity form the first-harmonic resonance network in parallel of described drain-source electric capacity; Described the 3rd inductance, the first microstrip line and the 3rd electric capacity are connected in turn in the drain electrode, and the 3rd capacity earth, and this first microstrip line and the 3rd electric capacity form the resonant network of secondary or triple-frequency harmonics; Described the first microstrip line connects DC power supply simultaneously, forms the feed circuit to drain electrode; Described the 4th inductance is arranged between the resonant network and first-harmonic resonance network in parallel of second harmonic, makes the first inductance, the second inductance, the 3rd inductance, the 4th inductance and the first microstrip line form the loop.
The below describes in detail radio-frequency power amplifier output circuit structure of the present invention with embodiment again.
See also Fig. 1, Fig. 1 is the structural representation of the radio-frequency power amplifier output circuit of the specific embodiment of the present invention.As shown in the figure: the grid G of radio-frequency power amplifier is input, and drain D is output, and source S is with drain-source capacitor C ds together ground connection.One end of the second inductance L 2 and the 3rd inductance L 3 is connected in parallel on the drain D.The other end of the second inductance L 2 is connected on the first inductance L 1 and the second capacitor C 2 simultaneously, the other end ground connection of this second capacitor C 2.Another termination the 4th inductance L 4 and first capacitor C 1 of the first inductance L 1, the other end ground connection of this first capacitor C 1.The other end that the 4th inductance connects connects the 3rd capacitor C 3, the first microstrip line B1 and the second microstrip line B2, the other end ground connection of the 3rd capacitor C 3 simultaneously.The other end of the first microstrip line B1 is connected on the 3rd inductance L 3, and the match circuit M1 of an output is connected on the johning knot of this first microstrip line B1 and the 3rd inductance L 3, is used for output impedance is mated and output signal is sent out.DC power supply VDD is connected on the johning knot of the first microstrip line B1 and the 3rd capacitor C 3 by one second microstrip line B2, is used for the drain electrode of radio-frequency power amplifier is powered.Wherein the first inductance L 1, the second inductance L 2, the 3rd inductance L 3, the 4th inductance L 4 and the first microstrip line B1 form a loop.
In this output circuit structure, the second inductance L 2 and the second capacitor C 2 form the resonant network of adjustable second harmonic or triple-frequency harmonics, by forming the Low ESR to second harmonic or triple-frequency harmonics, make the filtering on this resonant network of second harmonic or triple-frequency harmonics.Here for second harmonic or the selection of triple-frequency harmonics, can realize by the value of regulating the second inductance L 2 or the second capacitor C 2.
The second inductance L 2 forms again the first-harmonic resonance network in parallel of drain-source capacitor C ds simultaneously with the first inductance L 1 and the first capacitor C 1, by the first inductance L 1, the second inductance L 2 and the first capacitor C 1 resonance at fundamental frequency formation and drain-source capacitor C ds, thereby reduce the reactance of this drain-source capacitor C ds, improve output frequency range and the power amplification efficient of radio-frequency power amplifier.This first capacitor C 1 preferably is chosen for a kind of electric capacity with larger capacitance simultaneously, make the resonance frequency of this electric capacity be far smaller than fundamental frequency, so, this series resonant network becomes very large to the reactance of first-harmonic, first-harmonic forms open circuit in this series resonant network, can't conducting, reduced the loss of first-harmonic.
The first microstrip line B1 and the 3rd capacitor C 3 have also formed the resonant network of adjustable second harmonic or triple-frequency harmonics, this resonant network can carry out filtering with the second harmonic in the output signal or triple-frequency harmonics, the second harmonic and the triple-frequency harmonics that in the high frequency ac signal of drain electrode output, the linearity are had the greatest impact like this, entering between the output matching circuit just by filtering, improved the linearity of signal.Usually form complementation by the first microstrip line B1 and the 3rd capacitor C 3 resonant network that forms and the resonant network that is formed by the second inductance L 2 and the second capacitor C 2, if namely the resonant network of the second inductance L 2 and the second capacitor C 2 compositions is resonant networks of second harmonic, the resonant network that then is comprised of the first microstrip line B1 and the 3rd capacitor C 3 is chosen as the resonant network of triple-frequency harmonics, otherwise, then will be chosen as by the resonant network that the first microstrip line B1 and the 3rd capacitor C 3 form the resonant network of second harmonic.
The first microstrip line B1 plays the effect that connects DC power supply and drain D also as the feed circuit of DC power supply VDD simultaneously, and DC power supply VDD can be powered to drain D.This first microstrip line B1 is preferably the electrical length of λ/4, and namely 1/4 of fundamental wavelength, then this moment, feed circuit presented open circuit, can't circulate for first-harmonic.And for second harmonic, the networking that this first microstrip line B1 and the 3rd capacitor C 3 form is equivalent to short circuit, and second harmonic is grounded filtering at that point.For further improving the frequency range of video ripple, this first microstrip line B1 also can select to be slightly less than the electrical length of λ/4, is not enough to destroy the power supply of DC power supply as long as guarantee first-harmonic.
Further, can to be designed to electrical length be λ/8 with being connected on the second microstrip line B2 between the johning knot of DC power supply VDD and the first microstrip line B1 and the 3rd capacitor C 3, so, for second harmonic, this second microstrip line B2 forms open circuit, guarantees that DC power supply VDD is not affected by AC signal.
See also Fig. 2 and Fig. 3, Fig. 2 is the comparison diagram of modulation impedance of the present invention and prior art, and Fig. 3 is the comparison diagram of phase linearity of the present invention and prior art.As shown in Figure 2, wherein curve 1 is modulation impedance-frequency curve of the prior art, curve 2 is to use the adjustment impedance-frequency curve that obtains after the radio-frequency power amplifier output circuit structure of the present invention, can find out, suppose that modulation impedance is 2 units, frequency corresponding in the curve 1 only has 50MHz less than a bit, and the present invention has then surpassed 150MHz, so that the amplification of modulation bandwidth is above original 3 times.As shown in Figure 3, wherein curve 3 is phase linearity-frequency curves of the prior art, curve 4 is to use the phase linearity-frequency curve that obtains after the radio-frequency power amplifier output circuit structure of the present invention, can find out, take phase place up and down 10 degree as example, in the prior art, frequency surpasses 70MHz has just made phase fluctuation surpass 10 degree, and in the present invention, the frequency bandwidth between this phase region is near 350MHz, and the phase linearity that the present invention will export wire size has improved 5 times.Illustrate that the present invention improves the linearity of output signal greatly, thereby increased the bandwidth of video ripple.
In sum, the present invention proposes a kind of output circuit structure of radio-frequency power amplifier, this output circuit structure has comprised second harmonic resonant network, triple-frequency harmonics resonant network, and the series resonant network of drain-source electric capacity.Resonant network and feed circuit with second harmonic combines simultaneously, can satisfy the filter action to second harmonic, and can satisfy again the feed circuit AC signal does not affect DC power supply to the power supply function of leak.The prior art of comparing, the present invention has following advantage:
First: second harmonic and triple-frequency harmonics in the simultaneously filtering output signal so that the linearity of output signal improves, increase the bandwidth of video ripple;
Second: can eliminate drain-source electric capacity to the restriction of high-frequency signal, improve the delivery efficiency of radio-frequency power amplifier;
The the 3rd: second harmonic resonant network and feed circuit are combined, make whole output circuit structure simple and effective, reduced simultaneously the cost of this output circuit.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can in the situation that does not break away from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to embodiment illustrated herein, but will meet the widest scope consistent with principle disclosed herein and features of novelty.To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can in the situation that does not break away from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to embodiment illustrated herein, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (6)
1. the output circuit structure of a radio-frequency power amplifier, be arranged between the output and match circuit of radio-frequency power amplifier, the grid of this radio-frequency power amplifier is input, drain electrode is output, source ground is characterized in that: this output circuit structure comprises DC power supply, the first electric capacity, the second electric capacity, the 3rd electric capacity, the first inductance, the second inductance, the 3rd inductance, the 4th inductance and the first microstrip line;
Described the second inductance and the second electric capacity are connected in turn in the drain electrode, and the second capacity earth, and this second inductance and the second electric capacity form the resonant network of adjustable secondary or triple-frequency harmonics;
Described the second inductance, the first inductance and the first electric capacity are connected in turn in the drain electrode, and the first capacity earth, and this second inductance, the first inductance and the first electric capacity form the first-harmonic resonance network in parallel of described drain-source electric capacity;
Described the 3rd inductance, the first microstrip line and the 3rd electric capacity are connected in turn in the drain electrode, and the 3rd capacity earth, and this first microstrip line and the 3rd electric capacity form the resonant network of adjustable secondary or triple-frequency harmonics;
Described the first microstrip line connects DC power supply simultaneously, forms the feed circuit to drain electrode;
Described the 4th inductance is arranged between the resonant network and first-harmonic resonance network in parallel of second harmonic, makes the first inductance, the second inductance, the 3rd inductance, the 4th inductance and the first microstrip line form the loop.
2. the output circuit structure of radio-frequency power amplifier as claimed in claim 1, it is characterized in that: described match circuit is connected on the johning knot of described the 3rd inductance and the first microstrip line.
3. the output circuit structure of radio-frequency power amplifier as claimed in claim 1 is characterized in that: further comprise the second microstrip line in the described feed circuit, be connected between described the first microstrip line and the DC power supply.
4. the output circuit structure of radio-frequency power amplifier as claimed in claim 1, it is characterized in that: described the 3rd electric capacity is that radio frequency moves back lotus root electric capacity.
5. the output circuit structure of radio-frequency power amplifier as claimed in claim 1 is characterized in that: the resonance frequency of described the first electric capacity makes this series resonant network form open circuit for first-harmonic in drain electrode less than the fundamental frequency in the output signal.
6. the output circuit structure of radio-frequency power amplifier as claimed in claim 1 is characterized in that: the electrical length of described the first microstrip line is λ/4 or less than λ/4, λ is fundamental wavelength.
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Cited By (5)
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| WO2015139311A1 (en) * | 2014-03-21 | 2015-09-24 | 华为技术有限公司 | Power amplification circuit and transmitter |
| CN105979438A (en) * | 2016-05-30 | 2016-09-28 | 歌尔股份有限公司 | Wind noise-prevention microphone single body and earphone |
| CN108780012A (en) * | 2018-04-17 | 2018-11-09 | 深圳和而泰数据资源与云技术有限公司 | AC Electrical Machine Winding temperature sensing circuit, temperature monitor and alternating current generator |
| CN111181503A (en) * | 2020-01-03 | 2020-05-19 | 广州慧智微电子有限公司 | Radio frequency signal processing circuit |
| CN114362694A (en) * | 2022-03-17 | 2022-04-15 | 壹甲子(成都)通讯有限公司 | Alternating current small signal driving radio frequency microwave oscillator |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2015139311A1 (en) * | 2014-03-21 | 2015-09-24 | 华为技术有限公司 | Power amplification circuit and transmitter |
| US9866181B2 (en) | 2014-03-21 | 2018-01-09 | Huawei Technologies Co., Ltd. | Power amplification circuit and transmitter |
| CN105979438A (en) * | 2016-05-30 | 2016-09-28 | 歌尔股份有限公司 | Wind noise-prevention microphone single body and earphone |
| CN108780012A (en) * | 2018-04-17 | 2018-11-09 | 深圳和而泰数据资源与云技术有限公司 | AC Electrical Machine Winding temperature sensing circuit, temperature monitor and alternating current generator |
| CN111181503A (en) * | 2020-01-03 | 2020-05-19 | 广州慧智微电子有限公司 | Radio frequency signal processing circuit |
| CN114362694A (en) * | 2022-03-17 | 2022-04-15 | 壹甲子(成都)通讯有限公司 | Alternating current small signal driving radio frequency microwave oscillator |
| CN114362694B (en) * | 2022-03-17 | 2022-05-17 | 壹甲子(成都)通讯有限公司 | Alternating current small signal driving radio frequency microwave oscillator |
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