CN102271425B - A kind of method and apparatus for protecting power amplifier - Google Patents
A kind of method and apparatus for protecting power amplifier Download PDFInfo
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- CN102271425B CN102271425B CN201110169177.0A CN201110169177A CN102271425B CN 102271425 B CN102271425 B CN 102271425B CN 201110169177 A CN201110169177 A CN 201110169177A CN 102271425 B CN102271425 B CN 102271425B
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/52—Circuit arrangements for protecting such amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3089—Control of digital or coded signals
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Abstract
A kind of method and apparatus for protecting power amplifier, this method includes：Carry out delay process and power detection processing respectively to data signal to be launched；Wherein, the duration for carrying out delay process is equal to the duration for carrying out power detection processing；After detecting that exception occurs for data signal to be launched, shut-off processing is carried out to the part of exception occurs in the data signal to be launched after delay.The device includes：Transmission signal delay unit, for carrying out delay process to data signal to be launched；Wherein, the duration for carrying out delay process is equal to the duration that power detection processing unit carries out power detection processing；Power detection processing unit, for carrying out power detection processing to data signal to be launched；Power amplifier protects execution unit, for after power detection processing unit detects that exception occurs for data signal to be launched, shut-off processing to be carried out to the part of exception occurs in the data signal to be launched after delay.The present invention can perform power amplifier safeguard measure on digital intermediate frequency link.
Description
Technical field
The present invention relates to field of mobile communication, more particularly to a kind of method and apparatus for protecting power amplifier.
Background technology
In field of mobile communication, base station system is by Base Band Unit (Base Band Unit, BBU) and Remote Radio Unit
(Radio Remote Unit, RRU) two parts are constituted.Baseband signal of the RRU transmitting chains primary recipient from BBU, and to base
Band signal carries out numeric field processing, DAC (Digital to Analog Converter) conversion, signal up-conversion, radio-frequency power
The functions such as amplification, signal filtering, finally by aerial radiation to free space.The power and quality of RRU output signals are directly determined
Determine the coverage and Zone of cell, and radio-frequency power amplifier is used as the terminal units of whole base station system, its work
Can the stability and reliability of work directly affects base station system and normally run, it is ensured that the coverage of cell and business
It is normally carried out.Simultaneously as power amplifier is RF high power device, it is the device for being easiest to damage again in the base station system course of work
Part, therefore, it is an important content that corresponding safeguard measure is taken power amplifier in product design process.
Under normal circumstances, it is to introduce some powerful abnormal signals in link processing to cause the reason for power amplifier is damaged,
These high-power signals enter after power amplifier, it is possible to power amplifier is impacted, these abnormal signals mainly include：
1) prolonged high-power signal；
2) the super high power signal of moment；
3) broadband signal；
4) than larger burr (i.e. the broadband signal of moment).
Conventional power amplifier protection technique is to control the method being combined to realize by hardware detecting circuit and software at present
's.The realization approach of this method is power output by hardware detecting circuit to transmission signal, PA (Power
Amplifier, power amplifier) temperature, VSWR (Voltage Standing Wave Ratio, voltage standing wave ratio) etc. carry out
Detection, detect may cause power amplifier damage abnormal conditions when, using power amplifier turn off or reduce transmission power by the way of come
Power amplifier is protected.
But, above-mentioned power amplification protecting method has the following disadvantages：
1) power amplifier is damaged caused by can not efficiently solving burr or wideband input signal；
2) abnormal signal that power amplifier may be caused to damage can not be judged in advance, to be protected in advance；
3) the high-power input signal of moment is a kind of main cause that power amplifier is damaged, and current this power amplifier protection side
Method can not be protected to the high-power signal of moment, because from hardware detection to moment high-power signal and then by software
Manage execution power amplifier and protect this process, the high-power signal of moment enters into power amplifier, and when taking safeguard measure, wink
Between high-power signal may disappear, therefore do not play to power amplifier real protective effect.
Application No. CN200610032779.0 disclosure of the invention a kind of base station power amplification protecting method and device, it passes through
Congestion control reduces transmission power, when there is the high-power signal of moment, and triggering by congestion control using reducing data
The power amplifier protected mode of the transmission power of the reduction of the channel signal.Because this guard method is by high layer software control realization,
Response speed is slow, when being triggered to power amplifier protection execution from abnormal signal, and the moment high-power input of power amplifier is recovered normal, because
This this method not only can not be protected effectively for the high-power abnormal signal of moment, on the contrary can be in moment high-power letter
Number disappear, when input signal recovers normal, reduced data channel due to performing, reduce the power amplifier protection of signal transmission power
Strategy, have impact on the portfolio of cell.Therefore this power amplification protecting method can not only be played to moment high-power abnormal signal
Effectively the effect of protection power amplifier, can influence being normally carried out for system business on the contrary.
The content of the invention
It is an object of the invention to provide a kind of method and apparatus for protecting power amplifier, power amplification protecting method is solved and not only can not
Power amplifier is effectively protected, the defect being normally carried out of system business can be influenceed on the contrary.
To solve the above problems, the invention provides a kind of method for protecting power amplifier, including：
Carry out delay process and power detection processing respectively to data signal to be launched；Wherein, delay process is carried out
Duration is equal to the duration for carrying out power detection processing；
After detecting that exception occurs for the data signal to be launched, to being sent out in the data signal to be launched after delay
Raw abnormal part carries out shut-off processing.
Further,
It is described that power detection processing is carried out to the data signal to be launched, specifically include：
Single-point power detection is carried out to the data signal to be launched；
It is described to detect that exception occurs for the data signal to be launched, specifically include：
The performance number of at least one signaling point is more than default single-point power threshold in the data signal to be launched；
The part that exception occurs in data signal to be launched after described pair of delay carries out shut-off processing, specifically includes：
It is more than default list by the data signal to be launched after constant power value emission delay, or by performance number
The signal point data of point power threshold is abandoned.
Further,
It is described that power detection processing is carried out to the data signal to be launched, specifically include：
Average power detection is carried out to the data signal to be launched；
It is described to detect that exception occurs for the data signal to be launched, specifically include：
The average power content of signaling point is more than default average power threshold value in the data signal to be launched；
The part that exception occurs in data signal to be launched after described pair of delay carries out shut-off processing, specifically includes：
Launch after the power of the data signal to be launched after the delay is reduced into zero step by step.
Further,
It is described that power detection processing is carried out to the data signal to be launched, specifically include：
Broadband Detection is carried out to the data signal to be launched；
It is described to detect that exception occurs for the data signal to be launched, specifically include：
Bottom performance number of being made an uproar in band outside useful signal is more than default broadband signal power threshold value；
The part that exception occurs in data signal to be launched after described pair of delay carries out shut-off processing, specifically includes：
Launch after the power of the data signal to be launched after the delay is reduced into zero step by step.
Further, methods described also includes：
After detecting that the data signal to be launched recovers normal, by the data signal to be launched after the delay
Power increase to step by step after former transmission power launch.
Correspondingly, present invention also offers a kind of device of protection power amplifier, including：
Transmission signal delay unit, for carrying out delay process to data signal to be launched；Wherein, delay process is carried out
Duration be equal to power detection processing unit carry out power detection processing duration；
The power detection processing unit, for carrying out power detection processing to the data signal to be launched；
Power amplifier protects execution unit, for detecting the data signal to be launched in the power detection processing unit
After generation exception, shut-off processing is carried out to the part of exception occurs in the data signal to be launched after delay.
Further,
The power detection processing unit includes single-point power detecting unit, for the data signal to be launched
Carry out single-point power detection；The performance number for being additionally operable at least one signaling point in the data signal to be launched is detected is big
When default single-point power threshold, judge that the data signal to be launched occurs abnormal；
The power amplifier protection execution unit is used to enter the part that exception occurs in the data signal to be launched after delay
Row shut-off is handled, and is specifically included：
The power amplifier protection execution unit is used to press the data signal to be launched after constant power value emission delay,
Or abandon the signal point data that performance number is more than default single-point power threshold.
Further,
Also include mean power detection unit in the power detection processing unit, for believing the numeral to be launched
Number carry out average power detection；The average power content for being additionally operable to the signaling point in the data signal to be launched is detected is more than
During default average power threshold value, judge that the data signal to be launched occurs abnormal；
The power amplifier protection execution unit is used to enter the part that exception occurs in the data signal to be launched after delay
Row shut-off is handled, and is specifically included：
The power amplifier protection execution unit is used to step by step reduce the power of the data signal to be launched after the delay
Launch after to zero.
Further,
Also include Broadband Detection unit in the power detection processing unit, for believing the numeral to be launched
Number carry out Broadband Detection；It is additionally operable to make an uproar bottom performance number in the band detected in addition to useful signal more than default broadband
During signal power threshold value, judge that the data signal to be launched occurs abnormal；
The power amplifier protection execution unit is used to enter the part that exception occurs in the data signal to be launched after delay
Row shut-off is handled, and is specifically included：
The power amplifier protection execution unit is used to step by step reduce the power of the data signal to be launched after the delay
Launch after to zero.
Further,
The power amplifier protection execution unit is additionally operable to detect the number to be launched in the power detection processing unit
After word signal recovers normal, the power of the data signal to be launched after the delay is increased to after former transmission power step by step and sent out
Penetrate.
After the present invention, it is ensured that in the momentary high power, continuous wave high power, width for occurring that power amplifier may be caused to damage
During band signal, before the transmission signal by delay is not also output to PA, power amplifier is just performed on digital intermediate frequency link and is protected
Shield measure, so as to effectively protect power amplifier.And by FPGA, (Field-Programmable Gate Array show for power amplifier protection
Field programmable gate array) internal realization, power amplifier protection and the fast response time recovered.In addition, this by controlling digital intermediate frequency
The method that signal shut-off carries out power amplifier protection, it is possible to achieve graceful shutdown and open transmission signal, it is to avoid high-power signal
The power amplifier caused is opened and closed suddenly to damage.
Brief description of the drawings
The position view of power amplifier protection device in Fig. 1 embodiment of the present invention；
The composition frame chart of power amplifier protection device in Fig. 2 embodiment of the present invention.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with accompanying drawing to the present invention
Embodiment be described in detail.It should be noted that in the case where not conflicting, in the embodiment and embodiment in the application
Feature can mutually be combined.
In the present embodiment, a kind of method for protecting power amplifier, applied in RRU, including：
Step 10, delay process and power detection processing are carried out to data signal to be launched respectively；
Wherein, during delay process is carried out, the duration of delay needs to be taken equal to progress power detection processing
It is long；
Carrying out power detection may include：Carry out single-point power detection, mean power inspection respectively to data signal to be launched
Survey and Broadband Detection.Single-point power detection refers to：To the work(of each signaling point in above-mentioned data signal to be launched
Rate is detected respectively, judges whether the power of current demand signal point is more than default single-point power threshold；Average power detection
Refer to：Mean power to signaling point in above-mentioned data signal to be launched is detected, judges whether the mean power is more than
Default average power threshold value；Broadband Detection refers to：To being made an uproar in the band outside useful signal, bottom power is detected, is sentenced
Whether the interior bottom power of making an uproar of the band that breaks is more than default broadband signal power threshold value.
Any testing result is more than corresponding predetermined threshold value as described above, that is, judges that the data signal to be launched occurs different
Often；
Step 20, after detecting that exception occurs for above-mentioned data signal to be launched, to the data to be launched after delay
The part that exception occurs in signal carries out shut-off processing.
In this step, it is necessary to handle strategy for the shut-off reasonable in design of abnormal signal to be transmitted, and it can be directed to
More than the data signal to be launched of above-mentioned each predetermined threshold value, different signals are correspondingly taken to turn off strategy.For more than list
The data signal to be launched of point power threshold, counts using by the transmitting of constant power value or by the abnormal signal of the generation
According to the strategy for directly abandoning transmitting zero-signal；For the data signal to be launched more than the exception of average power threshold value or broadband
Signal, using the strategy that the power of data signal to be launched is reduced to zero step by step, to carry out power amplifier protection.It is different detecting
Regular signal is eliminated, and after data signal to be launched recovers normal, former transmission power is returned to step by step using from zero, so as to effectively keep away
Exempt from the impact being turned off and on to power amplifier of input signal suddenly, i.e., data signal shut-off to be launched is carried out in digital intermediate frequency
When, generation one is launched again after being multiplied from 1 to 0 sequence of function with the power of the data signal to be launched after delay, so that
Transmission signal is set to carry out graceful shutdown；After abnormal signal disappearance, treating after 0 to 1 sequence of function and delay is generated
The data signal of transmitting is multiplied, so that data signal to be launched is smoothly opened.
The position that the power amplifier protection device of the offer of the present invention is realized in systems to signal as shown in figure 1, carry out
Attacking and defending protection is carried out before digital-to-analogue conversion.
As shown in Fig. 2 in this example, power amplifier protection device includes：Single-point power detecting unit 203, mean power inspection
Survey unit 204, Broadband Detection unit 205, transmission signal delay unit 201 and power amplifier protection execution unit 202；Wherein,
Single-point power detecting unit 203, mean power detection unit 204 and Broadband Detection unit 205 are constituted at power detection
Manage unit.
Single-point power detecting unit 203, mean power detection unit 204, Broadband Detection unit 205 are respectively used to pair
Data signal to be launched carries out single-point power detection, average power detection, Broadband Detection, and by the single-point work(detected
The interior bottom performance number of making an uproar of rate value, average power content, band is compared with the corresponding threshold value of setting, and in single-point power, be averaged work(
When any one in rate or broadband signal power value has more than corresponding threshold value, judge that the data signal to be launched is abnormal；
Transmission signal delay unit is used to carry out delay emission processing to data signal to be launched；The unit is to be launched
Signal carry out delay emission, and take maximum in the time that single-point power detection, average power detection, Broadband Detection need
For transmission signal time delay value；
Power amplifier protects execution unit 205, in single-point power detecting unit 203, mean power detection unit 204, width
When band signal detection unit 205 judges that data-signal to be launched occurs abnormal, choose power amplifier Preservation tactics and perform power amplifier
Protection.The unit chooses corresponding Preservation tactics when knowing that data-signal to be launched occurs abnormal according to abnormal conditions
(i.e.：For single-point overpower, take and a suitable performance number transmitting is lost or be reduced to transmitting data；For average
Power overpower is abnormal and broadband signal is abnormal, is believed using a numeral to be launched after 1 to 0 ordinal function and delay
Number be multiplied, by transmission signal graceful shutdown).It is normal in signal link, when recovering transmission signal, using one from 0 to 1 sequence
Array function is multiplied with transmission signal, and transmission signal is smoothly opened to recovery forward emitted signal.Power amplifier protection execution unit passes through
One is multiplied with the data signal to be launched after delay from 1 to 0 or from 0 to 1 sequence of function, so as to realize transmission signal
Graceful shutdown and open mode.When being turned off and on transmission signal, the sequence of function function used can be according to current
The parameters such as system nominal power, carrier number, carrier bandwidths, Binding experiment chooses proper sequence.Conventional linear ladder
Sequence, such as when being turned off to transmission signal, launch transmission signal shut-off in data to 0 at continuous 5, sequence can be used
Arrange (0.8,0.6,0.4,0.2,0), sequence (0.2,0.4,0.6,0.8,1) is used during opening, nonlinear sequence can also be chosen
Row, such as N values are respectively 0.2,0.4,0.6,0.8,1 during (1-N)/(1+N) sequence of function, wherein cut-off signals, are opened
Signal is that N values are respectively 0.8,0.6,0.4,0.2,0.
It is further described below with one of the present invention using example.
The method for protecting power amplifier, including：
(1) delay process and single-point power detection, average power detection and width are carried out respectively to data signal to be launched
Band signal is detected；Wherein, duration value most long the time required to the duration value of delay is equal to above-mentioned three kinds of testing processes；
(2) if detecting that the power of at least one signaling point in data signal to be launched exceedes single-point power threshold
Value, then use the strategy launched the data point by constant power value or the signal point data is directly abandoned to transmitting zero-signal；
(3) if fruit detects that the mean power of the data signal of the transmitting exceedes average power threshold value or the numeral is believed
There is abnormal broadband signal in number, then the power of data signal to be launched is reduced to zero step by step, to carry out power amplifier protection.
One of ordinary skill in the art will appreciate that all or part of step in the above method can be instructed by program
Related hardware is completed, and described program can be stored in computer-readable recording medium, such as read-only storage, disk or CD
Deng.Alternatively, all or part of step of above-described embodiment can also use one or more integrated circuits to realize.Accordingly
Each module/unit in ground, above-described embodiment can be realized in the form of hardware, it would however also be possible to employ the shape of software function module
Formula is realized.The present invention is not restricted to the combination of the hardware and software of any particular form.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the scope of the present invention.According to
The content of the invention of the present invention, can also there is other various embodiments, in the case of without departing substantially from spirit of the invention and its essence, be familiar with
Those skilled in the art is all in the spirit and principles in the present invention when that can make various corresponding changes and deformation according to the present invention
Within, any modifications, equivalent substitutions and improvements made etc. should be included within the scope of the present invention.
Claims (8)
1. a kind of method for protecting power amplifier, including：
Carry out delay process and power detection processing respectively to data signal to be launched, the power detection processing includes single-point
Power detection, average power detection and Broadband Detection；Wherein, the duration for carrying out delay process is equal to three kinds of testing process institutes
Take time most long duration value；
After detecting that exception occurs for the data signal to be launched, corresponding Preservation tactics are chosen according to abnormal conditions, it is right
The part that exception occurs in data signal to be launched after delay carries out shut-off processing；
The part that exception occurs in data signal to be launched after described pair of delay carries out shut-off processing, including：Prolong described
When after data signal to be launched power be reduced to zero step by step after launch, i.e., turn off carrying out data signal to be launched
When, generation one is launched again after being multiplied from 1 to 0 sequence of function with the power of the data signal to be launched after delay, so that
Transmission signal carries out graceful shutdown；
Disappeared in abnormal signal, after data signal to be launched recovers normal, by the data signal to be launched after the delay
Power increase to step by step after former transmission power launch, that is, generate one it is to be launched after 0 to 1 sequence of function and delay
Data signal is multiplied, so that data signal to be launched is smoothly opened.
2. the method as described in claim 1, it is characterised in that：
It is described that power detection processing is carried out to data signal to be launched, specifically include：
Single-point power detection is carried out to the data signal to be launched；
It is described to detect that exception occurs for the data signal to be launched, specifically include：
The performance number of at least one signaling point is more than default single-point power threshold in the data signal to be launched.
3. method as claimed in claim 2, it is characterised in that：
It is described that power detection processing is carried out to data signal to be launched, specifically include：
Average power detection is carried out to the data signal to be launched；
It is described to detect that exception occurs for the data signal to be launched, specifically include：
The average power content of signaling point is more than default average power threshold value in the data signal to be launched.
4. method as claimed in claim 3, it is characterised in that：
It is described that power detection processing is carried out to data signal to be launched, specifically include：
Broadband Detection is carried out to the data signal to be launched；
It is described to detect that exception occurs for the data signal to be launched, specifically include：
Bottom performance number of being made an uproar in band outside useful signal is more than default broadband signal power threshold value.
5. a kind of device of protection power amplifier, including：
Transmission signal delay unit, for carrying out delay process to data signal to be launched；Wherein, carry out delay process when
Duration value most long the time required to long three kinds of testing processes of progress equal to power detection processing unit；
The power detection processing unit, for carrying out power detection processing, the power to the data signal to be launched
Detection process includes single-point power detection, average power detection and Broadband Detection；
Power amplifier protects execution unit, for detecting that the data signal to be launched occurs in the power detection processing unit
After exception, corresponding Preservation tactics are chosen according to abnormal conditions, to exception occurs in the data signal to be launched after delay
Part carries out shut-off processing；
The power amplifier protection execution unit is used to close the part that exception occurs in the data signal to be launched after delay
Disconnected processing, including：Launch after the power of the data signal to be launched after the delay is reduced into zero step by step, that is, treated
During the data signal shut-off of transmitting, the power of a data signal to be launched after 1 to 0 sequence of function and delay is generated
Launch again after multiplication, so that transmission signal carries out graceful shutdown；
The power amplifier protection execution unit is additionally operable to detect the numeral letter to be launched in the power detection processing unit
After number recovering normal, the power of the data signal to be launched after the delay is increased to after former transmission power step by step and launched,
I.e. after abnormal signal disappearance, generation one is multiplied from 0 to 1 sequence of function with the data signal to be launched after delay, with
Data signal to be launched is set smoothly to open.
6. device as claimed in claim 5, it is characterised in that：
The power detection processing unit includes single-point power detecting unit, for being carried out to the data signal to be launched
Single-point power detection；The performance number for being additionally operable at least one signaling point in the data signal to be launched is detected is more than in advance
If single-point power threshold when, judge that the data signal to be launched occurs abnormal.
7. device as claimed in claim 6, it is characterised in that：
Also include mean power detection unit in the power detection processing unit, for entering to the data signal to be launched
Row average power detection；The average power content of the signaling point in the data signal to be launched is detected is additionally operable to more than default
Average power threshold value when, judge that the data signal to be launched occurs abnormal.
8. device as claimed in claim 7, it is characterised in that：
Also include Broadband Detection unit in the power detection processing unit, for entering to the data signal to be launched
Row Broadband Detection；It is additionally operable to make an uproar bottom performance number in the band detected in addition to useful signal more than default broadband signal
During power threshold, judge that the data signal to be launched occurs abnormal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110169177.0A CN102271425B (en) | 2011-06-22 | 2011-06-22 | A kind of method and apparatus for protecting power amplifier |
| PCT/CN2012/076078 WO2012174972A1 (en) | 2011-06-22 | 2012-05-29 | Power amplifier protection method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110169177.0A CN102271425B (en) | 2011-06-22 | 2011-06-22 | A kind of method and apparatus for protecting power amplifier |
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| CN102271425A CN102271425A (en) | 2011-12-07 |
| CN102271425B true CN102271425B (en) | 2017-07-14 |
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| CN201110169177.0A Active CN102271425B (en) | 2011-06-22 | 2011-06-22 | A kind of method and apparatus for protecting power amplifier |
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| WO (1) | WO2012174972A1 (en) |
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| CN102271425B (en) * | 2011-06-22 | 2017-07-14 | 南京中兴新软件有限责任公司 | A kind of method and apparatus for protecting power amplifier |
| CN103187936B (en) * | 2011-12-30 | 2017-04-12 | 中兴通讯股份有限公司 | Fault protection method and device for power amplifier |
| CN103188185B (en) * | 2011-12-30 | 2018-01-19 | 江苏傲龙信通科技有限公司 | Power amplification protecting method and device in digital pre-distortion |
| CN103715995B (en) * | 2012-10-08 | 2017-02-15 | 京信通信系统（中国）有限公司 | Power amplifier protection method and device |
| CN103873076A (en) * | 2012-12-14 | 2014-06-18 | 北京北广科技股份有限公司 | High-power medium wave transmitter and parallel operation control method |
| CN104009950A (en) * | 2013-02-21 | 2014-08-27 | 京信通信系统（广州）有限公司 | Method and apparatus for protecting power amplifier in digital predistortion power amplifier system |
| CN105024657A (en) * | 2014-04-30 | 2015-11-04 | 京信通信系统（中国）有限公司 | Power amplifier protection method and system |
| CN107612588B (en) * | 2017-10-26 | 2019-06-25 | 京信通信系统（中国）有限公司 | A kind of power amplification protecting method and device |
| CN108574462B (en) * | 2018-01-31 | 2021-03-26 | 中兴通讯股份有限公司 | Protection circuit and circuit protection method |
| CN109150633A (en) * | 2018-10-19 | 2019-01-04 | 京信通信系统（中国）有限公司 | A kind of method and device of power amplifier protection |
| TW202423063A (en) * | 2022-11-28 | 2024-06-01 | 南韓商三星電子股份有限公司 | Electronic device for preventing damage to radio frequency front end, and electronic system including the same |
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| CN101425680A (en) * | 2008-12-08 | 2009-05-06 | 中兴通讯股份有限公司 | Overdriving protection method and circuit |
| CN102064880A (en) * | 2009-11-13 | 2011-05-18 | 中兴通讯股份有限公司 | Radio frequency remote module and power amplifier protection method thereof |
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| CN100382470C (en) * | 2002-06-11 | 2008-04-16 | 华为技术有限公司 | Soft base station system based on fiber optic stretch and synchronous method thereof |
| CN101656513B (en) * | 2008-08-18 | 2012-05-30 | 邦讯技术股份有限公司 | Method for protecting power amplifier and protective circuit |
| CN102271425B (en) * | 2011-06-22 | 2017-07-14 | 南京中兴新软件有限责任公司 | A kind of method and apparatus for protecting power amplifier |
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| CN101425680A (en) * | 2008-12-08 | 2009-05-06 | 中兴通讯股份有限公司 | Overdriving protection method and circuit |
| CN102064880A (en) * | 2009-11-13 | 2011-05-18 | 中兴通讯股份有限公司 | Radio frequency remote module and power amplifier protection method thereof |
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| WO2012174972A1 (en) | 2012-12-27 |
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