CN106685448A - Cellphone radio-frequency front-end transmission link power consumption and ACLR optimal matching method - Google Patents
Cellphone radio-frequency front-end transmission link power consumption and ACLR optimal matching method Download PDFInfo
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- CN106685448A CN106685448A CN201710047172.8A CN201710047172A CN106685448A CN 106685448 A CN106685448 A CN 106685448A CN 201710047172 A CN201710047172 A CN 201710047172A CN 106685448 A CN106685448 A CN 106685448A
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- aclr
- power consumption
- power amplifier
- electric capacity
- duplexer
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/12—Neutralising, balancing, or compensation arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transmitters (AREA)
Abstract
The invention discloses a cellphone radio-frequency front-end transmission link power consumption and ACLR optimal matching method, and belongs to the technical field of cellphone frequency conversion and modulation methods. According to the invention, cellphone elements comprise a power amplifier (PA), a duplexer (DPX), an antenna switching module (ASM), a coaxial connector (Connector), and PCB mainboard. The method mainly comprises the three steps: 1, carrying out the matching of a common end link to the impedance of 50 ohm; 2, carrying out the matching of the convergence of the diplexer; 3, carrying out the matching of the loadpull of the power amplifier, wherein the loadpull comprises the efficiency loadpull, power loadpull, ALCR loadpull, and gain loadpull. Through the above three steps, the method can achieve a purpose of enabling an emitter to achieve the emission with optimal linearity and optimal efficiency. The method is suitable for a mobile terminal and is especially suitable for a cellphone terminal with an MTK platform.
Description
Technical field
Present invention relates particularly to a kind of mobile phone front end transmitting chain power consumption and ACLR Method of Optimal Matching, belong to mobile phone
Frequency-variable Modulation method and technology field.
Background technology
Radio communication is a kind of communication that the characteristic propagated in free space using electromagnetic wave signal enters row information exchange
Mode.Different from wired communication mode, signal is decayed square being inversely proportional to distance in wireless channel, and handheld terminal is received and dispatched
Non- integrated amplifier unit inside device, output is relatively low, thus need plug-in high power amplifier come meet certain communication away from
From.
Traditional handheld device meets extended telephone conversation based on voice communication with efficient saturated power amplifier
Demand, as high bandwidth, digitized, high-speed data upload the technologies such as the growth requirement downloaded, and Direct Conversion, high order modulation
Promotion so that linear power amplifier arises at the historic moment.
However, the linearity and efficiency of Linear Power Amplifier are conflicts.If depending on mobile phone terminal power-limited, that
Constant gain can be provided without any electronic equipment, the constant linearity also just cannot be provided；On the other hand, in order that
In hgher efficiency, under conditions of same output, system needs to absorb less power from power supply, and this is just inevitably pressed
Contracting gain, i.e., using Back_off technologies, as shown in Figure 1.This will cause the linearity to reduce.Concrete manifestation form be power consumption and
The contradiction of ACLR (efficiency and the linearity).
Smith circle diagrams are mainly used on the impedance matching of transmission line.As shown in Fig. 2 the figure is made up of three round systems, to
Solved using diagram method in transmission line and some waveguide problems, to avoid loaded down with trivial details computing.One transmission lines
The electrical impedance (Impedance) of (Transmission Line) can change with its length, design a set of matching
(Matching) circuit, needs the characteristics of passing through many complicated calculation procedures, Smith circle diagrams to be to omit some to calculate journeys
Sequence, intuitively efficiently makees impedance matching.
During matching and debugging, be frequently encountered power consumption it is relatively low when, ACLR surplus very littles；When ACLR surpluses are big, power consumption is very
Greatly, it is difficult to both performances are optimal simultaneously.
The content of the invention
Therefore, the present invention seeks to purpose is to provide a kind of efficient matching process, power consumption and ACLR are quickly realized most
Optimization.
Specifically, the method for the present invention is comprised the following steps：
Step one matching antenna switch module is exported to coaxial connector end link to 50ohm；
Step 2 matches the convergence of duplexer；
The Loadpull of step 3 mesh power amplifier.
Further, the step one is specially：
Baseband signal becomes rf modulated signal through Direct Conversion process, Jing after radio-frequency power amplifier amplifies, transmission
To duplexer, afterwards radio frequency stand is reached through antenna switch module, match antenna switch module to the impedance line of radio frequency stand
Mismatch, the Port1 mouths of Network Analyzer connect the outfan of antenna switch module, and Port2 mouths connect radio frequency stand, with network point
During analyzer measurement S21, start-stop frequency covers the full frequency band that pcb board is supported, usually：Start Freq=600MHz,
Stop Freq=2700MHz, observe Smith circle diagrams, according to the principle after first going here and there simultaneously, change antenna switch module and radio frequency seat
The value of inductance, electric capacity between son, makes arc near the center of circle diagram.
Further, the step 2 is specially：
The value of inductance, electric capacity between fixed antenna switch module and radio frequency stand, by the Port1 mouths of Network Analyzer work(is connect
The output of rate amplifier, Port2 mouths connect radio frequency stand, while removing power amplifier on pcb board, adjust antenna switch module
Inductance, electric capacity between duplexer, by pcb board debugging acid is connected to, and enters the pattern that send out by force, observes Smith circle diagram super bands
The degree of convergence of figure, changes inductance, the value of electric capacity between antenna switch module and duplexer, makes frequency range figure gather convergence,
Then between fixed antenna switch module and duplexer inductance, electric capacity value.
Further, the step 3 is specially：
According to the Loadpull charts of power amplifier, the efficiency circles such as most excellent ACLR circles and optimum are found out, and according to walking
Gesture, finds out a point, while take into account efficiency and ACLR, and put with this it is as a reference point, adjust duplexer and power amplifier it
Between inductance, electric capacity, frequency range figure is concentrated to this point and draw close, then fix electricity between duplexer and power amplifier
Sense, the value of electric capacity.
Further, after the step 3 is fixed between duplexer and power amplifier inductance, the value of electric capacity, also wrap
Calibration steps is included, the calibration steps is specially：
Again take one piece of complete pcb board, change inductance, the value of electric capacity that step one determines to step 3, with debugging acid with
Comprehensive test instrument observes saturation power, and ACLR and power consumption, if ACLR and power consumption are both deteriorated, the weight of return to step one are observed after calibration
New matching, if ACLR and power consumption one of them improve, another variation then observes again loadpull, and a point is found out again,
Poor that is more taken into account, inductance, the value of electric capacity between duplexer and power amplifier is adjusted, frequency range figure is made to this
A little concentrate and draw close, inductance, the value of electric capacity then fixed between duplexer and power amplifier is recalibrated afterwards, again
Observation power consumption and ACLR, the compromise balance until obtaining power consumption and ACLR.
The beneficial effects of the present invention is：The adjustment method of mobile phone front end transmitting chain match circuit of the present invention, profit
Compromise point is found out with Smith artworks, the balance of power consumption and ACLR is realized.Matching and debugging efficiency can be significantly improved, and realizes power consumption
Compromise with ACLR is balanced.The suitable mobile terminal of the present invention, the mobile phone terminal of particularly MediaTek Inc. (MTK) platform is used.
Description of the drawings
Fig. 1 is the Back_off technology schematic diagrams in background technology in gain compression method；
Fig. 2 is the Smith circle diagram schematic diagrams in background technology；
Fig. 3 is the mobile phone terminal transmitting chain system construction drawing used in embodiment；
Fig. 4 is the schematic diagram of the first step in embodiment 1；
Fig. 5 is the schematic diagram of second step in embodiment 1；
Fig. 6 is the schematic diagram of the 3rd step in embodiment 1.
Specific embodiment
The specific embodiment of the present invention is illustrated below in conjunction with the accompanying drawings：
Mobile phone components and parts used in the present embodiment include power amplifier (PA), duplexer (DPX), antenna switch module
(ASM), coaxial connector (Connector), PCB main board.Mainly realized by following 3 step：Step 1, matching common port chain
Road is to 50ohm impedances；The convergence of step 2, matching duplexer；The loadpull of step 3, mesh power amplifier, including effect
Rate loadpull, power loadpull, ALCRloadpull, gain loadpull etc..3 steps by more than, are capable of achieving transmitter
Launch in optimum linear and optimum efficiency.
System shown in Figure 3 is common mobile phone terminal transmitting chain system, and baseband signal becomes to penetrate through Direct Conversion process
Frequency modulation, Jing after radio-frequency power amplifier amplifies, transmits to duplexer, reaches radio frequency seat through antenna switch module afterwards
Son.Because the single-ended impedance of each chip on link is 50ohm, so the impedance that need to only match microstrip line or strip line is lost
Match somebody with somebody.The first step seeks to match antenna switch module to the mismatch of the impedance line of radio frequency stand.The Port1 mouths of Network Analyzer connect
The outfan of antenna switch module, Port2 mouths connect radio frequency stand, as shown in Figure 4.It is common port in view of this section of impedance line,
When measuring S21 with Network Analyzer, start-stop frequency will cover the full frequency band that pcb board is supported, usually：StartFreq=
600MHz, Stop Freq=2700MHz, observe Smith circle diagrams, according to first go here and there after and principle, change L1, the value of C1, C2,
Arc is made near the center of circle diagram.
Second step fixes L1, and the Port1 mouths of Network Analyzer are met the output of power amplifier, Port2 by the value of C1, C2
Mouth connects radio frequency stand, as shown in Figure 5.Remove power amplifier on pcb board simultaneously, prevent high-power output from damaging instrument.It is main
It is to adjust L2, L3, C3 to work, so L4 series connection 0ohm, C4, C5 do not paste device.Because antenna switch module is active device, institute
To need upper electricity, and pcb board is connected to into debugging acid, enters the pattern that send out by force.Because the duplexer of most of producers is all in capacitive,
So the preferential shunt inductance on L3, and frequency range is higher, inductance value is less, observes the convergence journey of Smith circle diagram super band figures
Degree.According to the priority of L3.L2.C3, frequency range figure is set to gather convergence.Then the value of L3.L2.C3 is fixed.
3rd step, according to the Loadpull charts that power amplifier producer provides, finds out most excellent ACLR and justifies and most excellent
Efficiency is justified, and according to tendency, finds out a point, while taking into account efficiency and ACLR, and as a reference point, regulation L4, C4 is put with this,
C5, makes frequency range figure concentrate to this point and draws close, then fixed L4, the value of C4, C5, as shown in fig. 6, in Fig. 6, Vramp=
2.0V, Vdd=3.5V, Pin=3dBm, f=824MHz.
In view of active test and the difference of non-source test, one piece of complete pcb board need to be again taken, change the L1 for determining before,
The value of C1, C2, L3.L2.C3, L4, C4, C5, with debugging acid and comprehensive test instrument observation saturation power, observes ACLR and work(after calibration
Consumption, this group matching under normal circumstances is optimal value, and ACLR and power consumption can be up to standard.If ACLR and power consumption are both deteriorated,
That will return to origin, match again according to three above-mentioned steps；If one of them improves for ACLR and power consumption, another change
Difference, then observe again loadpull, and a point is found out again, more takes into account poor that.Afterwards, L4, C4 are adjusted, C5's
Value, makes frequency range figure concentrate to this point and draws close, and then fixes L4, the value of C4, C5.Afterwards by calibration, power consumption is observed again
And ACLR.So test repeatedly, the compromise balance until obtaining power consumption and ACLR.
By these steps, expeditiously transmitting chain can be matched, it is to avoid blind to adjust the time caused to waste, with
And cannot balance efficiency and the linearity this conflict.
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, on the premise of without departing from principle of the present invention, some improvements and modifications can also be made, these improvements and modifications
Should be regarded as protection scope of the present invention.
Claims (5)
1. a kind of mobile phone front end transmitting chain power consumption and ACLR Method of Optimal Matching, it is characterised in that methods described foundation
Mobile phone components and parts include that power amplifier, duplexer, antenna switch module, coaxial connector, PCB main board are realized, methods described
Comprise the following steps：
Step one matching antenna switch module is exported to coaxial connector end link to 50ohm；
Step 2 matches the convergence of duplexer；
The Loadpull of step 3 mesh power amplifier.
2. mobile phone front end transmitting chain power consumption as claimed in claim 1 and ACLR Method of Optimal Matching, it is characterised in that
The step one is specially：
Baseband signal becomes rf modulated signal through Direct Conversion process, Jing after radio-frequency power amplifier amplifies, transmits to double
Work device, reaches radio frequency stand through antenna switch module afterwards, matches antenna switch module to the mistake of the impedance line of radio frequency stand
Match somebody with somebody, the Port1 mouths of Network Analyzer connect the outfan of antenna switch module, Port2 mouths connect radio frequency stand, with Network Analyzer
During measurement S21, start-stop frequency covers the full frequency band that pcb board is supported, usually：Start Freq=600MHz, Stop
Freq=2700MHz, observes Smith circle diagrams, according to the principle after first going here and there simultaneously, changes between antenna switch module and radio frequency stand
The value of inductance, electric capacity, makes arc near the center of circle diagram.
3. mobile phone front end transmitting chain power consumption as claimed in claim 2 and ACLR Method of Optimal Matching, it is characterised in that
The step 2 is specially：
The value of inductance, electric capacity between fixed antenna switch module and radio frequency stand, connects the Port1 mouths of Network Analyzer power and puts
The output of big device, Port2 mouths connect radio frequency stand, while remove power amplifier on pcb board, adjust antenna switch module with it is double
Inductance, electric capacity between work device, by pcb board debugging acid is connected to, and enters the pattern that send out by force, observes Smith circle diagram super band figures
Degree of convergence, change inductance, the value of electric capacity between antenna switch module and duplexer, make frequency range figure gather convergence, then
The value of inductance, electric capacity between fixed antenna switch module and duplexer.
4. mobile phone front end transmitting chain power consumption as claimed in claim 3 and ACLR Method of Optimal Matching, it is characterised in that
The step 3 is specially：
According to the Loadpull charts of power amplifier, the efficiency circles such as most excellent ACLR circles and optimum are found out, and according to tendency, looked for
Go out a point, while taking into account efficiency and ACLR, and electricity as a reference point, between regulation duplexer and power amplifier is put with this
Sense, electric capacity, make frequency range figure concentrate to this point and draw close, inductance, the electric capacity then fixed between duplexer and power amplifier
Value.
5. mobile phone front end transmitting chain power consumption as claimed in claim 4 and ACLR Method of Optimal Matching, it is characterised in that
After inductance, the value of electric capacity that the step 3 is fixed between duplexer and power amplifier, also including calibration steps, the school
Quasi- step is specially：
One piece of complete pcb board is taken again, inductance, the value of electric capacity that step one determines to step 3 is changed, with debugging acid and comprehensive survey
Instrument observes saturation power, and ACLR and power consumption are observed after calibration, if ACLR and power consumption are both deteriorated, return to step one is again
Match somebody with somebody, if ACLR and power consumption one of them improve, another variation then observes again loadpull, and a point is found out again, more
Take into account poor that, adjust inductance, the value of electric capacity between duplexer and power amplifier, make frequency range figure to this point
Concentration is drawn close, inductance, the value of electric capacity then fixed between duplexer and power amplifier, is recalibrated afterwards, is observed again
Power consumption and ACLR, the compromise balance until obtaining power consumption and ACLR.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710047172.8A CN106685448A (en) | 2017-01-20 | 2017-01-20 | Cellphone radio-frequency front-end transmission link power consumption and ACLR optimal matching method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710047172.8A CN106685448A (en) | 2017-01-20 | 2017-01-20 | Cellphone radio-frequency front-end transmission link power consumption and ACLR optimal matching method |
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| CN106685448A true CN106685448A (en) | 2017-05-17 |
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| CN102412913A (en) * | 2011-10-24 | 2012-04-11 | 惠州Tcl移动通信有限公司 | Test system and antenna debugging method for mobile communication terminal |
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| CN104378085A (en) * | 2014-11-27 | 2015-02-25 | 重庆蓝岸通讯技术有限公司 | RF impedance matching debugging method |
| CN104485900A (en) * | 2014-11-27 | 2015-04-01 | 重庆蓝岸通讯技术有限公司 | Antenna impedance matching method on basis of key index data of power amplifier |
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2017
- 2017-01-20 CN CN201710047172.8A patent/CN106685448A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120087282A1 (en) * | 2009-07-02 | 2012-04-12 | Murata Manufacturing Co., Ltd. | Wireless communication high-frequency circuit and wireless communication apparatus |
| CN102412913A (en) * | 2011-10-24 | 2012-04-11 | 惠州Tcl移动通信有限公司 | Test system and antenna debugging method for mobile communication terminal |
| CN104378085A (en) * | 2014-11-27 | 2015-02-25 | 重庆蓝岸通讯技术有限公司 | RF impedance matching debugging method |
| CN104485900A (en) * | 2014-11-27 | 2015-04-01 | 重庆蓝岸通讯技术有限公司 | Antenna impedance matching method on basis of key index data of power amplifier |
Non-Patent Citations (4)
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| FLYINGBIRDYY: "优化RF3166 PA效率之实例分析", 《百度文库》 * |
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Application publication date: 20170517 |