CN105490650A - Power amplifier and application thereof - Google Patents
Power amplifier and application thereof Download PDFInfo
- Publication number
- CN105490650A CN105490650A CN201511023857.6A CN201511023857A CN105490650A CN 105490650 A CN105490650 A CN 105490650A CN 201511023857 A CN201511023857 A CN 201511023857A CN 105490650 A CN105490650 A CN 105490650A
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- CN
- China
- Prior art keywords
- power amplifier
- efficiency
- amplifier
- reader
- output
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 229920006395 saturated elastomer Polymers 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/68—Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
- H03F2203/20—Indexing scheme relating to power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F2203/21—Indexing scheme relating to power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F2203/211—Indexing scheme relating to power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only using a combination of several amplifiers
- H03F2203/21106—An input signal being distributed in parallel over the inputs of a plurality of power amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
- H03F2203/20—Indexing scheme relating to power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F2203/21—Indexing scheme relating to power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F2203/211—Indexing scheme relating to power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only using a combination of several amplifiers
- H03F2203/21142—Output signals of a plurality of power amplifiers are parallel combined to a common output
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- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Electromagnetism (AREA)
- General Health & Medical Sciences (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a power amplifier. The power amplifier comprises a coupler, a power amplifier body 1, a power amplifier body 2 and a combiner, wherein the power amplifier body 1 is an efficient C-type amplifier, has high gain and works in a saturated region; the power amplifier body 2 is a low-efficiency and high-linearity A-type amplifier and has low gain. Compared with the prior art, high-power output of the power amplifier is mainly achieved through the power amplifier body 1, and the high-linearity and low-efficiency power amplifier body 2 only needs to achieve the modulation function to make the power amplifier have the advantages that efficiency is high, and loss of the linearity degree is avoided.
Description
Technical Field
The invention belongs to the technical field of electronics, and particularly relates to a power amplifier and application thereof.
Background
The internet of things (internet) is an important trend of the development of information networking at present, and is called as the third wave of the world information industry after computers and the internet, wherein the radio frequency identification technology RFID has become one of the key technologies of the internet of things. The RFID technology is a non-contact automatic identification technology, which automatically identifies a target object and obtains related data by using a radio frequency signal, and has the advantages of wireless read/write identification, strong signal penetration capability, long distance, long service life, good environmental adaptability, simultaneous identification of multiple tags, easy and large information storage, rewritable data and the like, and is widely applied in recent years.
In the passive UHFRFID system, the reader/writer needs to continuously supply power to the tag in order to complete normal communication between the reader/writer and the tag. Especially for the case of reading the tag from a long distance (more than 10 meters), the antenna port of the reader/writer typically needs to output 1W of output power. And considering the insertion loss of passive devices such as a directional coupler, a switch and a feeder line behind a power amplifier in the reader-writer, the power amplifier needs to output 2W of power, and the linearity requirement is considered, the efficiency of the power amplifier adopting a ClassA or ClassAB structure is only about 15-20%, so that only the power supply of the power amplifier needs to provide more than 10W of power. When the reader-writer module is embedded into a handheld phone, the service life of a battery can be influenced, the design difficulty of heat dissipation can be increased, and the reliability of the whole handheld phone is further influenced. Based on the consideration, the efficiency of the power amplifier in the reader-writer is improved under the requirement of ensuring the linearity, so that the method has very important significance.
Disclosure of Invention
The invention aims to provide a power amplifier to solve the problems of low efficiency and low linearity in the prior art.
The technical problem to be solved by the present invention is to provide an application of the above power amplifier.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a kind of power amplifier, it includes coupler, power amplifier 1, power amplifier 2, and the combiner;
wherein,
the power amplifier 1 is a high-efficiency class-C amplifier, has high gain and works in a saturation region;
the power amplifier 2 is a low efficiency, high linearity class a amplifier with low gain.
The power amplifier 1 limits and outputs the radio frequency modulation signal coupled by the coupler, removes the modulation signal, and only outputs a carrier signal.
Wherein the power amplifier 2 implements a modulation function.
The combiner combines the carrier signal output by the power amplifier 1 and the modulation output by the power amplifier 2 into a modulation signal through the combiner.
The power amplifier is applied to a passive UHFRFID reader-writer system.
The application method is that the output of a drive amplifier of a radio frequency transmitter of the passive UHFRFID reader-writer is connected with the input of a power amplifier with high efficiency and high linearity, the output of the power amplifier with high efficiency and high linearity is connected with a coupler at a board level, and the other parts are the circuit structure of the universal passive UHFRFID reader-writer.
The power amplifier is applied to a passive UHFRFID handheld reader-writer.
The power amplifier is applied to a reader-writer system which conforms to the passive UHFRFID national standard or the national military standard.
Has the advantages that:
compared with the prior art, the high-power output of the invention is mainly realized by the high-efficiency power amplifier 1, and the high-linearity and low-efficiency power amplifier 2 only needs to realize the modulation function, so that the invention has the advantages of high efficiency and no loss of linearity. The invention is applied to the passive UHFRFID reader-writer, and can ensure that the passive UHFRFID reader-writer has higher efficiency and higher linearity. The invention is applied to the passive UHFRFID handheld reader-writer, and can ensure that the passive UHFRFID handheld reader-writer has the characteristics of long service life of a battery, low heat dissipation and high reliability. Compared with the traditional power amplifier structure, the structure of the new power amplifier has the advantage that the efficiency of the modulation signal which realizes the modulation depth of 30 percent in the UHFRFID national standard or the national military standard is improved to more than 40 percent from 15 to 20 percent.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic diagram of a passive uhf rfid system using a conventional power amplifier;
fig. 3 is a block diagram of a UHFRFID reader/writer employing the present invention.
Detailed Description
Example 1
The power amplifier shown in fig. 1 includes a coupler (1), a power amplifier 1(2), a power amplifier 2(3), and a combiner (4).
The power amplifier 1(2) is a high-efficiency class C amplifier, has high gain and works in a saturation region; the power amplifier 1(2) limits and outputs the radio frequency modulation signal coupled by the coupler, removes the modulation signal and only outputs the carrier signal.
The power amplifier 2(3) is a low-efficiency, high-linearity class-a amplifier, has low gain, and realizes a modulation function.
The combiner (4) combines the carrier signal output by the power amplifier 1(2) and the modulation output by the power amplifier 2(3) into a modulation signal through the combiner.
Example 2
Fig. 2 is a schematic diagram of a passive uhf rfid system using a conventional power amplifier.
In the passive UHFRFID system, the reader/writer needs to continuously supply power to the tag in order to complete normal communication between the reader/writer and the tag. Especially for the case of reading the tag from a long distance (more than 10 meters), the antenna port of the reader/writer typically needs to output 1W of output power. And considering the insertion loss of passive devices such as a directional coupler, a switch and a feeder line behind a power amplifier in the reader-writer, the power amplifier needs to output 2W of power, and the linearity requirement is considered, the efficiency of the power amplifier adopting a ClassA or ClassAB structure is only about 15-20%, so that only the power supply of the power amplifier needs to provide more than 10W of power. When the reader-writer module is embedded into a handheld phone, the service life of a battery can be influenced, the design difficulty of heat dissipation can be increased, and the reliability of the whole handheld phone is further influenced.
The new power amplifier circuit structure can be easily applied to a passive UHFRFID reader-writer system, as shown in figure 3.
The output of the drive amplifier of the radio frequency transmitter is connected with the input of the power amplifier, the output of the power amplifier is connected with the coupler of the board level, and the other parts are a universal reader-writer circuit structure. The new power amplifier performs the same function as the conventional power amplifier, but has higher efficiency and high linearity.
Example 3
The high-efficiency and high-linearity power amplifier can be applied to a reader-writer system which accords with the passive UHFRFID national standard or the national military standard.
For a modulation signal that achieves a modulation depth of 30% in the national UHFRFID standard or the national military standard, a new power amplifier configuration is adopted, and if it is finally required that 80% of the power of a 2W modulation signal comes from a high efficiency (e.g., 65% efficiency) power amplifier 1 and 20% of the power comes from a low linearity and efficiency (e.g., 18% efficiency) power amplifier 2, the efficiency of the new power amplifier is about 42.5% ((1.6/0.65 +0.4/0.18)/2), and sufficient linearity can be maintained. Therefore, compared with the traditional power amplifier structure, the efficiency of the novel power amplifier structure is improved from 15% -20% to more than 40%.
Claims (8)
1. A power amplifier is characterized in that the power amplifier comprises a coupler (1), a power amplifier 1(2), a power amplifier 2(3) and a combiner (4);
wherein,
the power amplifier 1(2) is a high-efficiency class C amplifier, has high gain and works in a saturation region;
power amplifier 2(3) is a low efficiency, high linearity class a amplifier with low gain.
2. The power amplifier of claim 1, wherein the power amplifier 1(2) limits the output of the rf modulated signal coupled from the coupler and removes the modulated signal, thereby outputting only the carrier signal.
3. The power amplifier of claim 1, wherein the power amplifier 2(3) implements a modulation function.
4. The power amplifier according to claim 1, wherein the combiner (4) combines the carrier signal output from the power amplifier 1(2) and the modulation output from the power amplifier 2(3) into a single modulation signal through the combiner.
5. Use of the power amplifier of claim 1 in a passive uhf rfid reader system.
6. The application of claim 5, wherein the passive UHFRFID reader RF transmitter has its driver amplifier output connected to the input of the high efficiency and high linearity power amplifier, and its output connected to the board level coupler.
7. Use of the power amplifier of claim 1 in a passive uhf rfid handheld reader.
8. Use of the power amplifier of claim 1 in a passive uhf rfid national standard or national military standard reader system compliance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511023857.6A CN105490650A (en) | 2015-12-31 | 2015-12-31 | Power amplifier and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511023857.6A CN105490650A (en) | 2015-12-31 | 2015-12-31 | Power amplifier and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105490650A true CN105490650A (en) | 2016-04-13 |
Family
ID=55677428
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201511023857.6A Pending CN105490650A (en) | 2015-12-31 | 2015-12-31 | Power amplifier and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105490650A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1157676A (en) * | 1994-09-14 | 1997-08-20 | 艾利森公司 | Efficient linear power amplification |
| US20060139091A1 (en) * | 2004-12-29 | 2006-06-29 | Fratti Roger A | Power amplifier employing thin film ferroelectric phase shift element |
| CN1805273A (en) * | 2005-01-12 | 2006-07-19 | 华为技术有限公司 | Method for improving efficiency of power amplifier |
| US7688137B2 (en) * | 2007-08-10 | 2010-03-30 | Electronics And Telecommunications Research Institute | Low power consuming mixed mode power amplifier |
| CN202197251U (en) * | 2011-07-21 | 2012-04-18 | 北京瑞德艾迪科技有限公司 | Power amplifying system |
| US20150137885A1 (en) * | 2013-11-18 | 2015-05-21 | Auriga Measurement Systems, LLC | Dual path rf amplifier circuit |
| CN205336243U (en) * | 2015-11-05 | 2016-06-22 | 北京动力源科技股份有限公司 | Well low frequency high power tube drive circuit and have electrical equipment of this circuit |
-
2015
- 2015-12-31 CN CN201511023857.6A patent/CN105490650A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1157676A (en) * | 1994-09-14 | 1997-08-20 | 艾利森公司 | Efficient linear power amplification |
| US20060139091A1 (en) * | 2004-12-29 | 2006-06-29 | Fratti Roger A | Power amplifier employing thin film ferroelectric phase shift element |
| CN1805273A (en) * | 2005-01-12 | 2006-07-19 | 华为技术有限公司 | Method for improving efficiency of power amplifier |
| US7688137B2 (en) * | 2007-08-10 | 2010-03-30 | Electronics And Telecommunications Research Institute | Low power consuming mixed mode power amplifier |
| CN202197251U (en) * | 2011-07-21 | 2012-04-18 | 北京瑞德艾迪科技有限公司 | Power amplifying system |
| US20150137885A1 (en) * | 2013-11-18 | 2015-05-21 | Auriga Measurement Systems, LLC | Dual path rf amplifier circuit |
| CN205336243U (en) * | 2015-11-05 | 2016-06-22 | 北京动力源科技股份有限公司 | Well low frequency high power tube drive circuit and have electrical equipment of this circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160413 |