CN2545778Y - Linear power amplifier in mobile communication base station - Google Patents
Linear power amplifier in mobile communication base station Download PDFInfo
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- CN2545778Y CN2545778Y CN02217236U CN02217236U CN2545778Y CN 2545778 Y CN2545778 Y CN 2545778Y CN 02217236 U CN02217236 U CN 02217236U CN 02217236 U CN02217236 U CN 02217236U CN 2545778 Y CN2545778 Y CN 2545778Y
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- power
- power amplifier
- potentiometer
- quiescent
- amplifier
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Abstract
The utility model relates to a linear power amplifier in mobile communication base station, which comprises a power splitter, a plurality of grid biasing circuits, a plurality of power amplifiers, a voltage regulator, a power synthesizer and an adjustable potentiometer which is connected with the outputting end of the voltage regulator. The middle tap outputting ends of the adjustable potentiometer are respectively connected with the inputting ends of a plurality of the grid biasing circuits. The potentiometer in the grid biasing circuit is adjusted firstly to make sure the quiescent working currents of each power transistor are of the same; then an output power reaches a rated value by inputting a multi-carrier frequency signal. The third-order inter-modulation of the outputting signal reaches a minimal value by adjusting the potentiometer, which is arranged at the outputting end of the voltage regulator. Then the quiescent working current is the needed and best quiescent working current of the whole last-stage power amplifier. In the prior art, adjusting and testing the quiescent working currents in category A and B power amplifier when a plurality of power transistors work together to compose the power is difficult. Compared with the power amplifier of the prior art, the utility model reduces difficulty on the basis that the cost is almost not increased.
Description
Technical field
The utility model relates to class AB LDMOS linear power amplifier, is specifically related to a kind of overloading in mobile communication base station linear power amplifier frequently.
Background technology
Overloading in communication base station linear power amplifier frequently requires very highly to the linearity, the LDMOS power transistor is because advantage such as that it has is high linear, high-gain and high efficiency and being widely adopted in the linear power amplifier frequently in overloading.Third order intermodulation is an important index describing the linear power amplifier linearity.In order to make power amplifier reach the certain power rollback, to guarantee linear index, powerful overloading frequently the final stage power amplifier of linear power amplifier almost all to adopt the power transistor of a plurality of concurrent workings to carry out power synthetic, as shown in Figure 1.The size of class AB LDMOS power amplifier third order intermodulation is except outside the Pass what and impedance matching with back-off have, and is subjected to the influence of static working current of LDMOS power transistor also very big.Under the situation of certain back-off, the minimum third order intermodulation value of corresponding amplifier has a best static working current usually.The height of grid voltage has determined the size of static working current.So the general potentiometer of adjusting in the gate bias circuit that adopts is provided with static working current.In order to make the third order intermodulation of power amplifier when the rated output power reach minimum, common way is: the first, static working current is adjusted near the current value of manufacturer's recommended; The second, the input multi-carrier frequency signals makes power output reach rated value; The 3rd, make third order intermodulation reach minimum by the potentiometer in observation of use instrument, the fine setting gate bias circuit.The static working current of this moment is exactly our desirable optimum current.Yet, under the synthetic situation of a plurality of power tube power shown in the accompanying drawing 1, consider the wherein conforming problem of each power tube grid thresholding cut-in voltage, each power tube all needs an independent potentiometer device to adjust static working current.So just require in the said first step static working current of all power tubes all to be transferred to the best in the above.Otherwise the third order intermodulation value of power amplifier is difficult to be transferred to the best.For example: the final stage of power amplifier has used 8 power tube rate of doing works synthetic, fine setting is one static working current wherein, if the third order intermodulation value of this power tube output is descended 1 decibel, can calculate in theory, the total third order intermodulation value of power amplifier only descends 0.1 decibel, and instrument is difficult to differentiate.So, above said the 3rd the step under this occasion, be difficult to prove effective.That is to say, generally speaking, when having only us to know our needed best static working current, just may under the synthetic situation of many power tube power, make the third order intermodulation value reach minimum.
Summary of the invention
The technical problems to be solved in the utility model is, linear power amplifier in a kind of mobile communication base station is provided, can overcome a plurality of power transistor concurrent workings in the prior art and carry out the defective that static working current in the class AB LDMOS power amplifier of power synthesis type is difficult for debugging the best, what exist in the solution prior art must accurately grasp the best static working current of each power transistor when its rated power is exported in advance, just can make the third order intermodulation value of whole power amplifier reach minimum problem.
The technical scheme that the utility model addresses the above problem is, construct a kind of overloading frequency linear power amplifier that is used for mobile communication base station, comprise power divider, a plurality of gate bias circuit, a plurality of power amplifier, pressurizer and power combiner, it is characterized in that, also comprise an adjustable potentiometer that is connected with described output end of voltage stabilizer, the centre tap output of described adjustable potentiometer is connected to the input of described a plurality of gate bias circuits respectively.
In above-mentioned overloading frequency linear power amplifier, comprise several 3 decibels, 90 degree directional couplers in the described power divider.
In above-mentioned overloading frequency linear power amplifier, comprise several 3 decibels, 90 degree directional couplers in the described power combiner.
The amplifier that provides by the utility model, the potentiometer that can adjust earlier in the gate bias circuit makes the static working current of each power transistor all reach consistent, importing multi-carrier frequency signals then makes power output reach rated value, adjust the potentiometer that is arranged on output end of pressure-stabilizing again and make the third order intermodulation of output signal reach minimum, the static working current of this moment is exactly the best static working current of needed whole final stage power amplifier; Adopt the utility model amplifier, compared with prior art, can be (the shared cost of potentiometer in whole power amplifier can be ignored) under the prerequisite that increases cost hardly, reduced the difficulty of carrying out static working current debugging in the class AB power amplifier of power synthesis type in a plurality of power transistor concurrent workings.
Description of drawings
Fig. 1 is the schematic block circuit diagram of the utility model amplifier.
Embodiment
As shown in Figure 1, the linear power amplifier that is provided by the utility model consists of the following components: power divider 101, gate bias circuit 102, power amplifier 103, pressurizer 104, potentiometer 105 and power combiner 106, as shown in Figure 1.Wherein, some 3 decibels of power divider 101 and power combiner 106 usefulness, 90 degree directional couplers or other form realize; Gate bias circuit 102 is a resistance-capacitance network, finishes grid filtering and adjusts power transistor grid voltage (with potentiometer adjustment wherein); The potentiometer 105 that is connected with the output of pressurizer 104 is cores of this amplifier, can adopt this potentiometer to realize the tracking of whole final stage power amplifier static working current.
As shown in Figure 1, overloading input signal is frequently delivered to power amplifier 103 through power divider 101, again by power combiner 106 output multi-carrier frequency signals.Bias voltage is delivered to potentiometer 105 after pressurizer 104 voltage stabilizings, the centre tap of potentiometer 105 is connected to gate bias circuit 102, the grid of the output control power amplifiers 103 of gate bias circuit 102.
The adjustment principle of the utility model amplifier is described below in conjunction with Fig. 1:
1) potentiometer makes the grid pressure that powers up each power transistor of back be 0V in the adjustment gate bias circuit 102, and the total quiescent current of power amplifier is 0A at this moment.
2) potentiometer of adjusting one by one in the gate bias circuit 102 (1020-1023) makes the static working current of each power amplifier 103 (1030-1033) reach consistent, the big I of current value is with reference to the recommended work electric current of manufacturer or adjust to about 1/10th of maximum drain current, the total quiescent current of power amplifier this moment is N * Id, and wherein Id is the quiescent current of single power transistor.
3) the input multi-carrier frequency signals makes power output reach rated power, and by observation of use instrument, adjust potentiometer 105 and make third order intermodulation reach minimum, the static working current of this moment is exactly the best static working current of our the whole power amplifier that needs.
The amplifier that the utility model provides, be to make the static working current of each power transistor all reach consistent by the potentiometer of adjusting in the gate bias circuit 102 (1020-1023), importing multi-carrier frequency signals then makes power output reach rated value, adjust the third order intermodulation that potentiometer 105 makes output signal again and reach minimum, the static working current of this moment is exactly the best static working current of our the whole final stage power amplifier that needs.
Adopt the utility model amplifier, compared with prior art (the shared cost of potentiometer 105 in whole power amplifier can be ignored) under the prerequisite that increases cost hardly, reduced the difficulty of carrying out static working current debugging in the class AB power amplifier of power synthesis type in a plurality of power transistor concurrent workings.
In sum, debugging of the present utility model is simple, effect is obvious, and same those skilled in the art can realize at an easy rate according to this specification.This amplifier can be widely used in the powerful overloading frequency of the various class AB LDMOS Linear Power Amplifier.
Claims (3)
1, the linear power amplifier in a kind of mobile communication base station, comprise power divider, a plurality of gate bias circuit, a plurality of power amplifier, pressurizer and power combiner, it is characterized in that, also comprise an adjustable potentiometer that is connected with described output end of voltage stabilizer, the centre tap output of described adjustable potentiometer is connected to the input of described a plurality of gate bias circuits respectively.
2, according to the described linear power amplifier of claim 1, it is characterized in that, comprise several 3 decibels, 90 directional couplers of spending in the described power divider.
3, according to the described linear power amplifier of claim 1, it is characterized in that, comprise several 3 decibels, 90 directional couplers of spending in the described power combiner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02217236U CN2545778Y (en) | 2002-04-29 | 2002-04-29 | Linear power amplifier in mobile communication base station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02217236U CN2545778Y (en) | 2002-04-29 | 2002-04-29 | Linear power amplifier in mobile communication base station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2545778Y true CN2545778Y (en) | 2003-04-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN02217236U Expired - Lifetime CN2545778Y (en) | 2002-04-29 | 2002-04-29 | Linear power amplifier in mobile communication base station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2545778Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102170268A (en) * | 2011-04-29 | 2011-08-31 | 中兴通讯股份有限公司 | Power amplification device and power amplification circuit |
| CN102170271A (en) * | 2011-04-29 | 2011-08-31 | 中兴通讯股份有限公司 | Power amplification device and power amplification circuit |
| CN102185565A (en) * | 2011-04-29 | 2011-09-14 | 中兴通讯股份有限公司 | Power amplifier and power amplifier circuit |
| WO2015090050A1 (en) * | 2013-12-18 | 2015-06-25 | 中兴通讯股份有限公司 | Amplifier system and device |
| CN107395143A (en) * | 2017-07-11 | 2017-11-24 | 南京正銮电子科技有限公司 | Third generation semiconductor biasing circuit integrated design |
-
2002
- 2002-04-29 CN CN02217236U patent/CN2545778Y/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102170268A (en) * | 2011-04-29 | 2011-08-31 | 中兴通讯股份有限公司 | Power amplification device and power amplification circuit |
| CN102170271A (en) * | 2011-04-29 | 2011-08-31 | 中兴通讯股份有限公司 | Power amplification device and power amplification circuit |
| CN102185565A (en) * | 2011-04-29 | 2011-09-14 | 中兴通讯股份有限公司 | Power amplifier and power amplifier circuit |
| WO2012146006A1 (en) * | 2011-04-29 | 2012-11-01 | 中兴通讯股份有限公司 | Power amplifier device and power amplifier circuit |
| US8773206B2 (en) | 2011-04-29 | 2014-07-08 | Zte Corporation | Power amplifier apparatus and power amplifier circuit |
| WO2015090050A1 (en) * | 2013-12-18 | 2015-06-25 | 中兴通讯股份有限公司 | Amplifier system and device |
| US9837964B2 (en) | 2013-12-18 | 2017-12-05 | Xi'an Zhongxing New Software Co. Ltd. | Amplifier system and device |
| CN107395143A (en) * | 2017-07-11 | 2017-11-24 | 南京正銮电子科技有限公司 | Third generation semiconductor biasing circuit integrated design |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SHENZHENG CITY ZTE CO., LTD. Free format text: FORMER OWNER: SHENZHENG CITY ZTE CO., LTD. SHANGHAI SECOND INSTITUTE Effective date: 20030725 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20030725 Address after: 518057 Department of law, Zhongxing building, South Science and technology road, Nanshan District hi tech Industrial Park, Shenzhen Patentee after: Zhongxing Communication Co., Ltd., Shenzhen City Address before: 200233 No. 396, Shanghai, Guilin Road Patentee before: Shanghai Inst. of No.2, Zhongxing Communication Co., Ltd., Shenzhen City |
|
| C56 | Change in the name or address of the patentee |
Owner name: ZTE CO., LTD. Free format text: FORMER NAME OR ADDRESS: SHENZHENG CITY ZTE CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Patentee after: ZTE Corporation Patentee before: Zhongxing Communication Co., Ltd., Shenzhen City |
|
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20120429 Granted publication date: 20030416 |