CN109150132A - Impedance-tumed method, device and mobile terminal - Google Patents
Impedance-tumed method, device and mobile terminal Download PDFInfo
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- CN109150132A CN109150132A CN201710464750.8A CN201710464750A CN109150132A CN 109150132 A CN109150132 A CN 109150132A CN 201710464750 A CN201710464750 A CN 201710464750A CN 109150132 A CN109150132 A CN 109150132A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/38—Impedance-matching networks
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Abstract
The present invention provides a kind of impedance-tumed method, device and mobile terminal.The described method includes: detecting the return loss of the radio frequency system current state and the total current of the radio-frequency front-end intermediate power amplifier；Total current based on the return loss and power amplifier, determines the load impedance of current state；According to the load impedance, impedance-tumed control signal is generated；Under the control signal function, matching impedance is exported.The present invention can be improved impedance-tumed speed.
Description
Technical field
The present invention relates to radio frequency arts more particularly to a kind of impedance-tumed method, device and mobile terminal.
Background technique
Impedance matching caused by maximum power transfer and reduction mismatch for reflecting in radio frequency system, and this point is for moving
Dynamic terminal is particularly important.Due to the change of communication channel, or by the interference of user, for example head, hand is close, and load impedance is not
Change avoidablely, thus caused by impedance mismatching by performances such as the output power of severe exacerbation mobile phone and radiation efficiencies,
Transceiving device even in damage mobile phone.In order to cope with the variation of load impedance, need to carry out between radio-frequency front-end and load
It is impedance-tumed, guarantee the impedance matching between radio-frequency front-end and load.
It is existing to realize impedance-tumed method, by detecting return loss, determined on Smith chart corresponding anti-
Coefficient circle is penetrated, the load impedance point on reflection coefficient circle is traversed, finally determines load impedance, by adjusting matching network
Obtain the impedance to match with load impedance.In practical applications, inventor has found that existing method needs to consume the plenty of time, adjusts
Humorous speed is slow.
Summary of the invention
Impedance-tumed method, device and mobile terminal provided by the invention, can save the time, improve impedance-tumed speed
Degree.
In a first aspect, the present invention provides a kind of impedance-tumed method, it is suitable for radio frequency system, the radio frequency system includes penetrating
Frequency front end and load, which comprises
Detect the return loss of the radio frequency system current state and the total current of the radio-frequency front-end intermediate power amplifier；
Total current based on the return loss and power amplifier, determines the load impedance point of current state；
According to the impedance of the load impedance point, the impedance-tumed control signal of the load impedance point is generated；
Under the impedance-tumed control signal function of the load impedance point, matching impedance is exported.
Optionally, the total current based on the return loss and power amplifier determines the load resistance of current state
Anti- point includes:
Determine the return loss corresponding reflection coefficient circle on Smith chart；
By on the load balance factor curve combining to Smith chart of the total current of the power amplifier, it is with the reflection
Number circle generates at least one intersection point；
If only one intersection point, determine that the intersection point is the load impedance point of current state.
Optionally, if there is multiple intersection points, the method also includes:
According to the impedance of the multiple intersection point, the impedance-tumed control signal of the multiple intersection point is generated respectively；
Respectively under the impedance-tumed control signal function of the multiple intersection point, a variety of matching impedances are exported；
The return loss under a variety of matching impedances is detected respectively；
Compare each return loss, determines that the intersection point for corresponding to maximum return loss is the load impedance point of current state.
Second aspect, the present invention provide a kind of impedance-tumed device, are suitable for radio frequency system, and the radio frequency system includes penetrating
Frequency front end and load, described device include:
Detection module, power is put in the return loss and the radio-frequency front-end for detecting the radio frequency system current state
The total current of big device；
Determining module determines the load of current state for the total current based on the return loss and power amplifier
Impedance point；
Control module generates the impedance-tumed control of the load impedance point for the impedance according to the load impedance point
Signal processed；
Adjustable matching network module, under the impedance-tumed control signal function of the load impedance point, output
With impedance.
Optionally, the determining module includes:
First determination unit, for determining the return loss corresponding reflection coefficient circle on Smith chart；
Superpositing unit, for by the load balance factor curve combining of the total current of the power amplifier to Smith chart
On, at least one intersection point is generated with the reflection coefficient circle；
Second determination unit, for when only one intersection point, determining that the intersection point is the load impedance point of current state.
Optionally, when there is multiple intersection points,
The control module, is also used to the impedance according to the multiple intersection point, generates the impedance of the multiple intersection point respectively
Tuning control signal；
The adjustable matching network module is also used to the impedance-tumed control signal function respectively in the multiple intersection point
Under, export a variety of matching impedances；
The detection module is also used to detect the return loss under a variety of matching impedances respectively；
Second determination unit is also used to each return loss of comparison, determines that the intersection point for corresponding to maximum return loss is
The load impedance point of current state.
The third aspect, the present invention provide a kind of mobile terminal, and the mobile terminal includes above-mentioned impedance-tumed device.
Impedance-tumed method, device and mobile terminal provided by the invention are obtained corresponding anti-by detection return loss
Coefficient circle is penetrated, and combines the load balance factor curve of the total current of radio-frequency front-end intermediate power amplifier, is utilized on Smith chart
The intersection point of reflection coefficient circle and load balance factor curve quickly and accurately determines load impedance, to correspondingly generate control letter
Number, export matching impedance.It compared with prior art, can the invention avoids the time-consuming process for traversing entire reflection coefficient circle
Impedance-tumed speed is improved, while changing sensitiveer, matching precision height to load impedance.
Detailed description of the invention
Fig. 1 is the flow chart of the impedance-tumed method of one embodiment of the invention；
Fig. 2 is the schematic diagram that step S12 determines load impedance point in Smith chart；
Fig. 3 is the structural schematic diagram of the impedance-tumed device of one embodiment of the invention；
Fig. 4 is the structural schematic diagram of the determining module of one embodiment of the invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
It is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
The embodiment of the present invention provides a kind of impedance-tumed method, is suitable for radio frequency system, the radio frequency system includes radio frequency
Front end and load, as shown in Figure 1, which comprises
S11, the return loss of the detection radio frequency system current state and the radio-frequency front-end intermediate power amplifier it is total
Electric current.
Forward direction (from radio-frequency front-end to the load) power of the radio frequency system and reversed (before loading to radio frequency is detected respectively
End) power, the decibel value of the difference of the two is return loss, also referred to as return loss (Return Loss, RL), for describing
The amplitude of reflection coefficient.
Detect the total current of the radio-frequency front-end intermediate power amplifier, including quiescent current and dynamic duty electric current.
S12, the total current based on the return loss and power amplifier, determine the load impedance point of current state.
On Smith chart, return loss RL uniquely corresponds to a reflection coefficient circle, according to the return loss detected
Determine its corresponding reflection coefficient circle；
Since radio-frequency front-end intermediate power amplifier is in design, debugging stage, need measured power amplifier in different loads
The current value consumed when impedance, if the identical point of current value is linked to be a curve, so that it may obtain the total of power amplifier
The load balance factor curve of electric current, each point electric current is identical on every curve, and load impedance is different.These curves are in design, debugging rank
Section just it has been determined that and it is preset in a lookup table.According to the total current of the power amplifier detected, can be looked for from look-up table
To corresponding load balance factor curve, by corresponding load balance factor curve combining to Smith chart, with predetermined reflection
Coefficient circle generates at least one intersection point.If only one intersection point, determine that the intersection point is the load impedance point of current state.
But two intersection points most ofly, can be generated, determine the negative of current state from described two intersection points using heuristic
Carry impedance point.As shown in Fig. 2, curve 0 indicates that return loss is 4.4dB, the reflection coefficient that reflectance magnitude is 0.6 in figure
Circle, curve 1 indicate that load balance factor curve when power amplifier total current is 350mA, curve 0 and curve 1 intersect at A, B two
Point, one of point must be the load impedance point of current state, and the load impedance of current state is determined from the two intersection points
Point, two steps most in this way are the load impedance that can determine current state.It specifically includes: a first optional friendship from described two intersection points
Point generates corresponding impedance-tumed control signal, under the control signal function, adjustable matching according to the impedance of A point such as A point
Network exports matching impedance, detects return loss at this time；Another intersection point is chosen again, such as B point, is repeated the above steps, first according to B
The impedance of point generates corresponding impedance-tumed control signal, under the control signal function, adjustable matching network output matching resistance
It is anti-, detect return loss at this time；Return loss in the case of two kinds is compared, the intersection point corresponding to larger return loss
The as load impedance point of current state.
As can be seen that determine load impedance point by this method, avoid existing method traversed on Smith chart it is whole
The time-consuming process of a reflection coefficient circle saves the plenty of time.
Distinguishingly, due to the influence of various non-ideal factors, the load balance factor curve of power amplifier total current may be
Irregular, unsmooth curve, at this moment with the reflection coefficient circle may more than two intersection point, but multiple intersection points need at this time
It to be handled using identical method, according to the impedance of the multiple intersection point, generate the impedance tune of the multiple intersection point respectively
Humorous control signal；Respectively under the impedance-tumed control signal function of the multiple intersection point, a variety of matching impedances are exported；It examines respectively
Survey the return loss under a variety of matching impedances；Compare each return loss, determines that the intersection point for corresponding to maximum return loss is
The load impedance point of current state.
It is taken a bit alternatively, it is also possible to successively appoint from the multiple intersection point, the resistance of the intersection point is generated according to the impedance of the point
Anti- tuning controls signal, under the impedance-tumed control signal function, exports matching impedance, detects return loss at this time, such as
Fruit return loss value is greater than preset threshold value, such as 13dB, then it is assumed that the point is the load impedance point of current state, remaining point
It does not need to reattempt.
S13, according to the impedance of the load impedance point, generate the impedance-tumed control signal of the load impedance point.
S14, under the impedance-tumed control signal function of the load impedance point, export matching impedance, i.e., with it is described negative
Carry the impedance that impedance matches.
Impedance-tumed method provided in an embodiment of the present invention obtains corresponding reflection coefficient circle by detecting return loss,
And the load balance factor curve of the total current of radio-frequency front-end intermediate power amplifier is combined, reflection coefficient circle is utilized on Smith chart
Load impedance is quickly and accurately determined with the intersection point of load balance factor curve, so that control signal is correspondingly generated, output matching
Impedance.Compared with prior art, the time-consuming process for traversing entire reflection coefficient circle is avoided, can be improved impedance-tumed speed,
Change sensitiveer, matching precision height to load impedance simultaneously.
The embodiment of the present invention also provides a kind of impedance-tumed device, is suitable for radio frequency system, and the radio frequency system includes penetrating
Frequency front end and load, as shown in figure 3, described device includes:
Detection module 31, power in the return loss and the radio-frequency front-end for detecting the radio frequency system current state
The total current of amplifier；
Determining module 32 determines the negative of current state for the total current based on the return loss and power amplifier
Carry impedance point；
Control module 33 generates the impedance-tumed of the load impedance point for the impedance according to the load impedance point
Control signal；
Adjustable matching network module 34, for exporting under the impedance-tumed control signal function of the load impedance point
Matching impedance.
The detection module 31 can detecte the forward direction of the radio frequency system by directional coupler and power detector
(from radio-frequency front-end to load) power and reversed (from radio-frequency front-end is loaded to) power, the decibel value of the difference of the two are backhaul damage
Consumption；The detection module 31 detects the total current of the radio-frequency front-end intermediate power amplifier, including static state by current sensor
Electric current and dynamic duty electric current.
Optionally, as shown in figure 4, the determining module 32 includes:
First determination unit 321, for determining the return loss corresponding reflection coefficient circle on Smith chart；
Superpositing unit 322, for the load balance factor curve combining of the total current of the power amplifier is round to Smith
On figure, at least one intersection point is generated with the reflection coefficient circle；
Second determination unit 323, for when only one intersection point, determining that the intersection point is the load impedance of current state
Point.
Further, when there is multiple intersection points,
The control module 33, is also used to the impedance according to the multiple intersection point, generates the resistance of the multiple intersection point respectively
Anti- tuning controls signal；
The adjustable matching network module 34 is also used to the impedance-tumed control signal function respectively in the multiple intersection point
Under, export a variety of matching impedances；
The detection module 31 is also used to detect the return loss under a variety of matching impedances respectively；
Second determination unit 323 is also used to each return loss of comparison, determines the intersection point for corresponding to maximum return loss
For the load impedance point of current state.
Impedance-tumed device provided in an embodiment of the present invention obtains corresponding reflection coefficient circle by detecting return loss,
And the load balance factor curve of the total current of radio-frequency front-end intermediate power amplifier is combined, reflection coefficient circle is utilized on Smith chart
Load impedance is quickly and accurately determined with the intersection point of load balance factor curve, to correspondingly generate control signal, is driven adjustable
Matching network module changes topological structure or component parameters, exports matching impedance to realize Dynamic Matching.Compared with prior art,
The time-consuming process for traversing entire reflection coefficient circle is avoided, can be improved impedance-tumed speed, while more to load impedance variation
Add sensitive, matching precision height.
The embodiment of the present invention also provides a kind of mobile terminal, and the mobile terminal includes above-mentioned impedance-tumed device.
Those of ordinary skill in the art will appreciate that realizing all or part of the process in above-described embodiment method, being can be with
Relevant hardware is instructed to complete by computer program, the program can be stored in a computer-readable storage medium
In, the program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein, the storage medium can be magnetic
Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access
Memory, RAM) etc..
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by those familiar with the art, all answers
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (7)
1. a kind of impedance-tumed method is suitable for radio frequency system, the radio frequency system includes radio-frequency front-end and load, and feature exists
In, comprising:
Detect the return loss of the radio frequency system current state and the total current of the radio-frequency front-end intermediate power amplifier；
Total current based on the return loss and power amplifier, determines the load impedance point of current state；
According to the impedance of the load impedance point, the impedance-tumed control signal of the load impedance point is generated；
Under the impedance-tumed control signal function of the load impedance point, matching impedance is exported.
2. the method according to claim 1, wherein described total based on the return loss and power amplifier
Electric current determines that the load impedance point of current state includes:
Determine the return loss corresponding reflection coefficient circle on Smith chart；
By on the load balance factor curve combining to Smith chart of the total current of the power amplifier, with the reflection coefficient circle
Generate at least one intersection point；
If only one intersection point, determine that the intersection point is the load impedance point of current state.
3. according to the method described in claim 2, it is characterized in that, if there is multiple intersection points, the method also includes:
According to the impedance of the multiple intersection point, the impedance-tumed control signal of the multiple intersection point is generated respectively；
Respectively under the impedance-tumed control signal function of the multiple intersection point, a variety of matching impedances are exported；
The return loss under a variety of matching impedances is detected respectively；
Compare each return loss, determines that the intersection point for corresponding to maximum return loss is the load impedance point of current state.
4. a kind of impedance-tumed device is suitable for radio frequency system, the radio frequency system includes radio-frequency front-end and load, and feature exists
In, comprising:
Detection module, for detect the radio frequency system current state return loss and the radio-frequency front-end intermediate power amplifier
Total current；
Determining module determines the load impedance of current state for the total current based on the return loss and power amplifier
Point；
Control module generates the impedance-tumed control letter of the load impedance point for the impedance according to the load impedance point
Number；
Adjustable matching network module, under the impedance-tumed control signal function of the load impedance point, output matching to hinder
It is anti-.
5. device according to claim 4, which is characterized in that the determining module includes:
First determination unit, for determining the return loss corresponding reflection coefficient circle on Smith chart；
Superpositing unit, for by the load balance factor curve combining of the total current of the power amplifier to Smith chart, with
The reflection coefficient circle generates at least one intersection point；
Second determination unit, for when only one intersection point, determining that the intersection point is the load impedance point of current state.
6. device according to claim 5, which is characterized in that when there is multiple intersection points,
The control module, is also used to the impedance according to the multiple intersection point, generates the impedance-tumed of the multiple intersection point respectively
Control signal；
The adjustable matching network module is also used to respectively under the impedance-tumed control signal function of the multiple intersection point, defeated
A variety of matching impedances out；
The detection module is also used to detect the return loss under a variety of matching impedances respectively；
Second determination unit is also used to each return loss of comparison, determines that it is current for corresponding to the intersection point of maximum return loss
The load impedance point of state.
7. a kind of mobile terminal, which is characterized in that the mobile terminal includes the resistance as described in any one of claim 4 to 6
Anti- tuner.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112152660A (en) * | 2020-09-25 | 2020-12-29 | Oppo（重庆）智能科技有限公司 | Control method and device of radio frequency circuit and electronic equipment |
| WO2022105501A1 (en) * | 2020-11-20 | 2022-05-27 | 青岛海尔特种电冰箱有限公司 | Control method for heating device, and heating device |
Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1541445A (en) * | 2001-08-10 | 2004-10-27 | 因芬尼昂技术股份公司 | Tunable impedance matching circuit for RF power amplifier |
| CN101005672A (en) * | 2007-01-09 | 2007-07-25 | Ut斯达康通讯有限公司 | Power amplifier based on PHS communication terminal |
| CN101297480A (en) * | 2005-10-31 | 2008-10-29 | Mks仪器股份有限公司 | Radio frequency power delivery system |
| CN101459476A (en) * | 2007-12-13 | 2009-06-17 | 启碁科技股份有限公司 | Method for tuning wireless radio frequency circuit by impedance load characteristic |
| CN101689869A (en) * | 2007-04-19 | 2010-03-31 | 脉冲芬兰有限公司 | Method and arrangement for matching an antenna |
| CN101796720A (en) * | 2007-09-07 | 2010-08-04 | 雷声公司 | Input circuitry for transistor power amplifier and method for designing such circuitry |
| CN102594286A (en) * | 2010-08-02 | 2012-07-18 | Lg伊诺特有限公司 | Apparatus and method for matching impedance using standing wave ratio information |
| CN103107793A (en) * | 2011-11-09 | 2013-05-15 | 中国科学院微电子研究所 | Transmission line automatic impedance matching system |
| CN103141024A (en) * | 2010-04-25 | 2013-06-05 | C·布隆贝格尔 | Method for determining a matching network based on poincar discs of reflection factors |
| CN103326685A (en) * | 2013-06-04 | 2013-09-25 | 湖南大学 | Radio-frequency antenna impedance self-adaption matching device and method with quantum algorithm applied |
| CN103828247A (en) * | 2011-09-19 | 2014-05-28 | 高通股份有限公司 | Adaptive tuning of an impedance matching circuit in a wireless device |
| CN105223526A (en) * | 2015-09-25 | 2016-01-06 | 沈阳东软医疗系统有限公司 | A kind of radio-frequency sending coil impedance matching circuit and method |
| CN105391502A (en) * | 2015-12-31 | 2016-03-09 | 陕西烽火电子股份有限公司 | Method for measuring actual output impedance of transmitter |
| CN105577198A (en) * | 2014-10-30 | 2016-05-11 | 联发科技股份有限公司 | Apparatus and method for controlling impedance tuning |
| CN106330128A (en) * | 2015-06-30 | 2017-01-11 | 展讯通信（上海）有限公司 | Integrated circuit achieving broadband balun |
| CN106372306A (en) * | 2016-08-31 | 2017-02-01 | 浪潮电子信息产业股份有限公司 | Method and device for determining position of load end impedor in Smith circle diagram |
-
2017
- 2017-06-19 CN CN201710464750.8A patent/CN109150132A/en active Pending
Patent Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1541445A (en) * | 2001-08-10 | 2004-10-27 | 因芬尼昂技术股份公司 | Tunable impedance matching circuit for RF power amplifier |
| CN101297480A (en) * | 2005-10-31 | 2008-10-29 | Mks仪器股份有限公司 | Radio frequency power delivery system |
| CN101005672A (en) * | 2007-01-09 | 2007-07-25 | Ut斯达康通讯有限公司 | Power amplifier based on PHS communication terminal |
| CN101689869A (en) * | 2007-04-19 | 2010-03-31 | 脉冲芬兰有限公司 | Method and arrangement for matching an antenna |
| CN101796720A (en) * | 2007-09-07 | 2010-08-04 | 雷声公司 | Input circuitry for transistor power amplifier and method for designing such circuitry |
| CN101459476A (en) * | 2007-12-13 | 2009-06-17 | 启碁科技股份有限公司 | Method for tuning wireless radio frequency circuit by impedance load characteristic |
| CN103141024A (en) * | 2010-04-25 | 2013-06-05 | C·布隆贝格尔 | Method for determining a matching network based on poincar discs of reflection factors |
| CN102594286A (en) * | 2010-08-02 | 2012-07-18 | Lg伊诺特有限公司 | Apparatus and method for matching impedance using standing wave ratio information |
| CN103828247A (en) * | 2011-09-19 | 2014-05-28 | 高通股份有限公司 | Adaptive tuning of an impedance matching circuit in a wireless device |
| CN103107793A (en) * | 2011-11-09 | 2013-05-15 | 中国科学院微电子研究所 | Transmission line automatic impedance matching system |
| CN103326685A (en) * | 2013-06-04 | 2013-09-25 | 湖南大学 | Radio-frequency antenna impedance self-adaption matching device and method with quantum algorithm applied |
| CN105577198A (en) * | 2014-10-30 | 2016-05-11 | 联发科技股份有限公司 | Apparatus and method for controlling impedance tuning |
| CN106330128A (en) * | 2015-06-30 | 2017-01-11 | 展讯通信（上海）有限公司 | Integrated circuit achieving broadband balun |
| CN105223526A (en) * | 2015-09-25 | 2016-01-06 | 沈阳东软医疗系统有限公司 | A kind of radio-frequency sending coil impedance matching circuit and method |
| CN105391502A (en) * | 2015-12-31 | 2016-03-09 | 陕西烽火电子股份有限公司 | Method for measuring actual output impedance of transmitter |
| CN106372306A (en) * | 2016-08-31 | 2017-02-01 | 浪潮电子信息产业股份有限公司 | Method and device for determining position of load end impedor in Smith circle diagram |
Non-Patent Citations (4)
| Title |
|---|
| AÑÓN, J. C R: "Prematching Tuners for Very High SWR and Power Load Pull Measurements", 《MICROWAVE JOURNAL》 * |
| T.T.哈 等: "窄带微波晶体管放大器的基本设计", 《国外舰船技术.雷达与对抗》 * |
| 徐琪: "E-PHEMT射频功率放大器的设计与仿真", 《计算机仿真》 * |
| 马传辉 等: "基于功放管最优负载阻抗的Doherty功率放大器效率提升方法", 《电子学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112152660A (en) * | 2020-09-25 | 2020-12-29 | Oppo（重庆）智能科技有限公司 | Control method and device of radio frequency circuit and electronic equipment |
| WO2022105501A1 (en) * | 2020-11-20 | 2022-05-27 | 青岛海尔特种电冰箱有限公司 | Control method for heating device, and heating device |
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