CN207218643U - A kind of radio-frequency power amplifier - Google Patents
A kind of radio-frequency power amplifier Download PDFInfo
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- CN207218643U CN207218643U CN201721109141.2U CN201721109141U CN207218643U CN 207218643 U CN207218643 U CN 207218643U CN 201721109141 U CN201721109141 U CN 201721109141U CN 207218643 U CN207218643 U CN 207218643U
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Abstract
The utility model belongs to wireless communication system technologies field, discloses a kind of radio-frequency power amplifier, including power tube, electric bridge, output coupling capacitor, the output matching circuit being sequentially connected；The output matching circuit uses the combination of microstrip line and electric capacity；First order power tube, second level power tube, first order electric bridge are sequentially connected, the output end of first order electric bridge is connected with third level power tube, fourth stage power tube respectively, first output matching circuit is between third level power tube and second level electric bridge, second output matching circuit is between fourth stage power tube and second level electric bridge, the input of second level electric bridge is connected with the first output coupling capacitor, the second output coupling capacitor respectively, and the output end of second level electric bridge is connected with the 3rd output matching circuit, RF output end respectively.The utility model realizes low cost and the miniaturization of low frequency RF power amplifier.
Description
Technical field
It the utility model is related to wireless communication system technologies field, more particularly to a kind of radio-frequency power amplifier.
Background technology
For radio communication, emitter is essential, and in emitter can not be exactly radio-frequency power amplification
Device.As digital mobile communication technology develops rapidly, to increase channel capacity, communication channel experienced from 150M and move on to 800-
900MHz, develop again to 3300-3600MHz frequency ranges now to 2300-2600MHz again later.Sent out to save frequency spectrum resource
A variety of systems are put on display：Frequency division multiple access, time division multiple acess, CDMA etc. have been used to digital mobile communication system.Go out again now
MC-CDMA (CDMA-MC) and OFDM (OFDM) system are showed.Moreover, new qam mode
Also reach its maturity, its maximum feature is to save frequency bandwidth.All these systems have common feature：1st, overloading wave system is belonged to
System；2nd, base-band signal spectrum has larger dynamic range.For example, in third generation gsm system, while enter system difference carrier wave
Level between may have up to 100dB difference.As can be seen here, along with the development of Modern Communication System, to power amplification
The requirement of device also more and more higher.
For the linearity, the power amplifier of communication system is always applied in large-scale condition, is operated in other words
Near P1dB operating point, this non-linear hour becomes even more serious：Third order intermodulation distortion, harmonic distortion, amplitude modulation(PAM) transfer are lost
Very, amplitude modulation and phase modulation transfer mistake etc. can all occur.When multicarrier inputs, influence maximum to system transmission signal is that three ranks are handed over
Adjust distortion.Under many occasions, in order to ensure the linearity of power amplifier, but cost is that efficiency reduces, power output reduces.
So the linearisation of power amplifier increasingly becomes focus of concern, although the development of microelectric technique, chip technology
Improve constantly the linearity of power amplifier, but linearity proposition of the lifting change of communication system always to power amplifier is higher
Requirement.RF linear high power amplifier is in the systems such as radar, radio communication, navigation, satellite communication, countermeasures set
Have a wide range of applications, be one of critical component of Modern wireless communication, therefore to the research of RF linear high power amplifier
Have very important significance.
In order to meet the requirement of linear and efficiency, prior art is realized typically in the form of Doherty power amplifiers, for
Low frequency radio frequency power amplifier, due to pipe price costly, therefore the problem of cost is higher be present.
Utility model content
The purpose of this utility model is to provide a kind of radio-frequency power amplifier, and low frequency radio frequency is realized with brand-new matching way
The low cost of power amplifier and miniaturization.
The utility model discloses a kind of radio-frequency power amplifier, including be sequentially connected power tube, electric bridge, output coupling
Electric capacity, output matching circuit；The output matching circuit uses the combination of microstrip line and electric capacity；
The power tube includes first order power tube, second level power tube, third level power tube, fourth stage power tube；Institute
Stating electric bridge includes first order electric bridge, second level electric bridge；The output coupling capacitor includes the first output coupling capacitor, the second output
Coupled capacitor；The output matching circuit includes the first output matching circuit, the second output matching circuit；
Wherein, the first order power tube, the second level power tube, the first order electric bridge are sequentially connected, and described
The output end of one-level electric bridge is connected with the third level power tube, the fourth stage power tube respectively, first output matching
For circuit between the third level power tube and the second level electric bridge, second output matching circuit is located at the described 4th
Between level power tube and the second level electric bridge, the input of the second level electric bridge is electric with first output coupling respectively
Hold, second output coupling capacitor connection, the output end of the second level electric bridge respectively with the 3rd output matching circuit,
RF output end connects.
Preferably, first output matching circuit includes the first microstrip line, the first electric capacity, the second electric capacity, the 7th electric capacity；
One end of first microstrip line is connected with the output end of the third level power tube, first microstrip line it is another
One end is connected with first output coupling capacitor；
One end of first electric capacity and second electric capacity is both connected on first microstrip line, first electric capacity
It is grounded with the other end of second electric capacity；One end of 7th electric capacity is connected with first output coupling capacitor, institute
State the other end ground connection of the 7th electric capacity.
Preferably, second output matching circuit includes the second microstrip line, the 3rd electric capacity, the 4th electric capacity, the 8th electric capacity；
One end of second microstrip line is connected with the output end of the fourth stage power tube, second microstrip line it is another
One end is connected with second output coupling capacitor；
One end of 3rd electric capacity and the 4th electric capacity is both connected on second microstrip line, the 3rd electric capacity
It is grounded with the other end of the 4th electric capacity；One end of 8th electric capacity is connected with second output coupling capacitor, institute
State the other end ground connection of the 8th electric capacity.
Preferably, the 3rd output matching circuit includes the 3rd microstrip line, the 9th electric capacity；
One end of 9th electric capacity is connected on the 3rd microstrip line, the other end ground connection of the 9th electric capacity.
The one or more technical schemes provided in the embodiment of the present application, have at least the following technical effects or advantages：
In the embodiment of the present application, output matching circuit uses the combination of microstrip line and electric capacity, by changing microstrip line
Shape and width can adjust the volume of radio-frequency power amplifier, and radio-frequency power amplifier is had maximum synthesis output work
Rate and efficiency, efficiency and linear requirement are disclosure satisfy that, realize low cost and the miniaturization of low frequency RF power amplifier.
Brief description of the drawings
It is required in being described below to embodiment to use in order to illustrate more clearly of the technical scheme in the present embodiment
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are one embodiment of the present utility model, for this
For the those of ordinary skill of field, on the premise of not paying creative work, it can also be obtained according to these accompanying drawings other
Accompanying drawing.
Fig. 1 is a kind of schematic diagram for radio-frequency power amplifier that the utility model embodiment provides.
Embodiment
The embodiment of the present application by providing a kind of radio-frequency power amplifier, with realize low frequency RF power amplifier it is low into
Sheet and miniaturization.
The technical scheme of the embodiment of the present application is in order to solve the above technical problems, general thought is as follows：
A kind of radio-frequency power amplifier, it is characterised in that including be sequentially connected power tube, electric bridge, output coupling capacitor,
Output matching circuit；The output matching circuit uses the combination of microstrip line and electric capacity；
The power tube includes first order power tube, second level power tube, third level power tube, fourth stage power tube；Institute
Stating electric bridge includes first order electric bridge, second level electric bridge；The output coupling capacitor includes the first output coupling capacitor, the second output
Coupled capacitor；The output matching circuit includes the first output matching circuit, the second output matching circuit；
Wherein, the first order power tube, the second level power tube, the first order electric bridge are sequentially connected, and described
The output port of one-level electric bridge is connected with the third level power tube, the fourth stage power tube respectively, first output
With circuit between the third level power tube and the second level electric bridge, second output matching circuit is positioned at described the
Between level Four power tube and the second level electric bridge, the input port of the second level electric bridge respectively with first output coupling
Electric capacity, second output coupling capacitor connection, the output port of the second level electric bridge respectively with the 3rd output matching
Circuit, radio frequency output port connection.
Output matching circuit of the present utility model using microstrip line and electric capacity combination, by change microstrip line shape and
Width can adjust the volume of radio-frequency power amplifier, and radio-frequency power amplifier is had maximum synthesis power output and effect
Rate, efficiency and linear requirement are disclosure satisfy that, realize low cost and the miniaturization of low frequency RF power amplifier.
In order that technical problem to be solved in the utility model, technical scheme and beneficial effect are clearer, understand, with
Under in conjunction with the accompanying drawings and embodiments, the utility model is further elaborated.It is it should be appreciated that described herein specific real
Example is applied only to explain the utility model, is not used to limit the utility model.
As shown in figure 1, it is a kind of schematic diagram of radio-frequency power amplifier preferred embodiment provided by the utility model.This reality
Applying example includes first order power tube Q1, second level power tube Q2, first order electric bridge H1, third level power tube Q3, fourth stage power amplifier
Pipe Q4, the first output matching circuit, the first output coupling capacitor C5, the second output matching circuit, the second output coupling capacitor C6,
Second level electric bridge H2, the 3rd output matching circuit.
First output matching circuit includes the first microstrip line 10, the first electric capacity C1, the second electric capacity C2, the 7th electric capacity
C7.One end of first microstrip line 10 is connected with the output end of the third level power tube Q3, first microstrip line 10
The other end is connected with the first output coupling capacitor C5；In addition, the first electric capacity C1 and the second electric capacity C2 one end
It is both connected on first microstrip line 10, the first electric capacity C1 and the second electric capacity C2 other end are grounded；It is described
7th electric capacity C7 one end is connected with the first output coupling capacitor C5, the other end ground connection of the 7th electric capacity C7.
Second output matching circuit includes the second microstrip line 11, the 3rd electric capacity C3, the 4th electric capacity C4, the 8th electric capacity
C8.One end of second microstrip line 11 is connected with the output end of the fourth stage power tube Q4, second microstrip line 11
The other end is connected with the second output coupling capacitor C6；In addition, the 3rd electric capacity C3 and the 4th electric capacity C4 one end
It is both connected on second microstrip line 11, the 3rd electric capacity C3 and the 4th electric capacity C4 other end are grounded；It is described
8th electric capacity C8 one end is connected with the second output coupling capacitor C6, the other end ground connection of the 8th electric capacity C8.
3rd output matching circuit includes the 3rd microstrip line 12 and the 9th electric capacity C9.
Two input ports of the second level electric bridge H2 are defeated with the first output coupling capacitor C5 and second respectively
Go out coupled capacitor C6 connections；Two output ends of the second level electric bridge H2 respectively with one end of the 3rd microstrip line 12 and
Output end connects；One end of 3rd microstrip line 12 is connected with second level electric bridge H2 isolation end, the 3rd microstrip line 12
The other end be connected with one end of the 9th electric capacity C9, the other end of the 9th electric capacity C9 ground connection.
The course of work of above-mentioned radio-frequency power amplifier approximately as：
Radio-frequency input signals passes through dual-stage amplifier (first order power tube Q1 and second level power tube Q2) respectively, wherein,
First order power tube Q1 is gain module, and for second level power tube Q2 to push away amplification module, dual-stage amplifier completes the pre- of radiofrequency signal
Amplification, and by signal output to first order electric bridge H1.First order electric bridge H1 divides the signal into two-way：Pass through third level power amplifier all the way
Pipe Q3, another way pass through fourth stage power tube Q4；Third level power tube Q3 output impedance is matched to 50 Ω so that single tube work
Make, in AB classes, fourth stage power tube Q4 output impedance to be matched into 50 Ω so that single tube is also operated in AB classes, two paths of signals warp
Second level electric bridge H2 and output matching circuit are crossed, so as to reach peak power output.
When radio-frequency power amplifier works, mainly there are following three kinds of working conditions：
(1) under small-power input state, fourth stage power tube Q4 is in cut-off state, only third level power tube Q3 works
Make, drawn by the active load of output end, third level power tube Q3 load is drawn to the higher output state of efficiency, together
When it is linearly preferable；
(2) under mid power input state, fourth stage power tube Q4 starts working, active due to fourth stage power tube Q4
Traction, third level power tube Q3 output voltage are maintained at presaturation state, at the same third level power tube Q3 load impedance by
2Ropt changes to Ropt, and fourth stage power tube Q4 load impedance is changed from open circuit to Ropt.So the working condition of power amplifier by
Maximal efficiency output state changes to peak power output state, in the case of maintaining efficiency constant in theory (it is actual under
Drop) output relatively high power；
(3) under high-power input state, third level power tube Q3 and the fourth stage power tube Q4 load are drawn to
Ropt, equivalent to AB class power combings, output reaches maximum.
Above-mentioned radio-frequency power amplifier can be used for 450MHz frequency ranges.
In other embodiments, radio-frequency power amplifier can also be that the radio-frequency power being made up of more stages power tube amplifies
Device, under this structure, except including the output matching circuit positioned at third level power tube and fourth stage power tube, second level electric bridge
Output matching circuit beyond, the front-located power amplifiers at different levels before final stage include output matching circuit.
A kind of radio-frequency power amplifier that the utility model embodiment provides comprises at least following technique effect：
In the embodiment of the present application, output matching circuit uses the combination of microstrip line and electric capacity, by changing microstrip line
Shape and width can adjust the volume of radio-frequency power amplifier, and radio-frequency power amplifier is had maximum synthesis output work
Rate and efficiency, efficiency and linear requirement are disclosure satisfy that, realize low cost and the miniaturization of low frequency RF power amplifier.
It should be noted last that above embodiment is only illustrating the technical solution of the utility model rather than limit
System, although the utility model is described in detail with reference to example, it will be understood by those within the art that, can be right
The technical solution of the utility model is modified or equivalent substitution, without departing from the spirit and model of technical solutions of the utility model
Enclose, it all should cover among right of the present utility model.
Claims (4)
1. a kind of radio-frequency power amplifier, it is characterised in that including the power tube, electric bridge, output coupling capacitor, defeated being sequentially connected
Go out match circuit；The output matching circuit uses the combination of microstrip line and electric capacity；
The power tube includes first order power tube, second level power tube, third level power tube, fourth stage power tube；The electricity
Bridge includes first order electric bridge, second level electric bridge；The output coupling capacitor includes the first output coupling capacitor, the second output coupling
Electric capacity；The output matching circuit includes the first output matching circuit, the second output matching circuit；
Wherein, the first order power tube, the second level power tube, the first order electric bridge are sequentially connected, the first order
The output end of electric bridge is connected with the third level power tube, the fourth stage power tube respectively, first output matching circuit
Between the third level power tube and the second level electric bridge, second output matching circuit is located at the fourth stage work(
Put between pipe and the second level electric bridge, the input of the second level electric bridge respectively with first output coupling capacitor, institute
The connection of the second output coupling capacitor is stated, the output end of the second level electric bridge exports with the 3rd output matching circuit, radio frequency respectively
End connection.
2. radio-frequency power amplifier according to claim 1, it is characterised in that first output matching circuit includes the
One microstrip line, the first electric capacity, the second electric capacity, the 7th electric capacity；
One end of first microstrip line is connected with the output end of the third level power tube, the other end of first microstrip line
It is connected with first output coupling capacitor；
One end of first electric capacity and second electric capacity is both connected on first microstrip line, first electric capacity and institute
The other end for stating the second electric capacity is grounded；One end of 7th electric capacity is connected with first output coupling capacitor, and described
The other end ground connection of seven electric capacity.
3. radio-frequency power amplifier according to claim 1, it is characterised in that second output matching circuit includes the
Two microstrip lines, the 3rd electric capacity, the 4th electric capacity, the 8th electric capacity；
One end of second microstrip line is connected with the output end of the fourth stage power tube, the other end of second microstrip line
It is connected with second output coupling capacitor；
One end of 3rd electric capacity and the 4th electric capacity is both connected on second microstrip line, the 3rd electric capacity and institute
The other end for stating the 4th electric capacity is grounded；One end of 8th electric capacity is connected with second output coupling capacitor, and described
The other end ground connection of eight electric capacity.
4. radio-frequency power amplifier according to claim 1, it is characterised in that the 3rd output matching circuit includes the
Three microstrip lines, the 9th electric capacity；
One end of 9th electric capacity is connected on the 3rd microstrip line, the other end ground connection of the 9th electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721109141.2U CN207218643U (en) | 2017-08-31 | 2017-08-31 | A kind of radio-frequency power amplifier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721109141.2U CN207218643U (en) | 2017-08-31 | 2017-08-31 | A kind of radio-frequency power amplifier |
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| CN207218643U true CN207218643U (en) | 2018-04-10 |
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| CN201721109141.2U Active CN207218643U (en) | 2017-08-31 | 2017-08-31 | A kind of radio-frequency power amplifier |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113541622A (en) * | 2020-04-15 | 2021-10-22 | 深圳市大富科技股份有限公司 | Power amplification circuit, 5G communication circuit and communication equipment |
-
2017
- 2017-08-31 CN CN201721109141.2U patent/CN207218643U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113541622A (en) * | 2020-04-15 | 2021-10-22 | 深圳市大富科技股份有限公司 | Power amplification circuit, 5G communication circuit and communication equipment |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 430205 Hubei city of Wuhan province Jiangxia Hidden Dragon Island Tan lake two Road No. 1 Patentee after: CITIC Mobile Communication Technology Co., Ltd Address before: 430073 Hubei province Wuhan Dongxin East Lake high tech Development Zone, Road No. 5 Patentee before: Wuhan Hongxin Telecommunication Technologies Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 430205 No.1 tanhu 2nd Road, Canglong Island, Jiangxia District, Wuhan City, Hubei Province Patentee after: CITIC Mobile Communication Technology Co.,Ltd. Address before: 430205 No.1 tanhu 2nd Road, Canglong Island, Jiangxia District, Wuhan City, Hubei Province Patentee before: CITIC Mobile Communication Technology Co., Ltd |