CN203590158U - Analog pre-distorting amplifier capable of being used for linearization of radio frequency power amplifier - Google Patents
Analog pre-distorting amplifier capable of being used for linearization of radio frequency power amplifier Download PDFInfo
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- CN203590158U CN203590158U CN201320649428.XU CN201320649428U CN203590158U CN 203590158 U CN203590158 U CN 203590158U CN 201320649428 U CN201320649428 U CN 201320649428U CN 203590158 U CN203590158 U CN 203590158U
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- amplifier
- distorting
- linearization
- radio frequency
- frequency power
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Abstract
The utility model provides an analog pre-distorting amplifier capable of being used for linearization of a radio frequency power amplifier, and belongs to the technical field of communication and broadcast. The analog pre-distorting amplifier comprises a carrier amplifier and a peak amplifier which form an equilibrium structure, wherein the bias voltage of the carrier amplifier and the bias voltage of the peak amplifier are different; an input end of the carrier amplifier is grounded through a 90-degree directional coupler; and an output end of the peak amplifier is grounded through a 90-degree directional coupler. Compared with the prior art, the analog pre-distorting amplifier capable of being used for linearization of the radio frequency power amplifier has a gain extension characteristic and has the advantages of small input standing-wave ratio, low insertion loss and simplicity in debugging.
Description
Technical field
The utility model belongs to communication, broadcast technology field, particularly can be used for the linearizing analog predistortion amplifier of radio-frequency (RF) power amplification.
Background technology
In existing 3G/4G communication system and in Digital Television emission system, the linearisation of radio-frequency power amplifier is a key problem.The technology that the linearisation of power amplifier the most generally adopts is at present digital pre-distortion (Digital Predistorter, DPD) technology, the structure that is typical digital pre-distortion system referring to Fig. 1.
Adopt digital pre-distortion technology can realize good linearisation effect, but, in digital predistorter, need to use on-site programmable gate array FPGA or similar application-specific integrated circuit ASIC to carry out behavior modeling and digital pre-distortion.This just causes system configuration more complicated, and cost is higher, also inapplicable in some middle-size and small-size systems.In addition, digital predistorter need to be used analog to digital converter AD to carry out the sampling of feedback signal, is subject to the restriction of AD device, and digital predistorter is also difficult to adopt in wide-band communication system.
Therefore, in these systems, need the substitute technology of digital pre-distortion, one of selecting is exactly analog predistortion technology (Analog Predistorter), adopts the predistorter with gain extension characteristic to carry out the gain compression of compensating power amplifier.Referring to Fig. 2, it is typical analog predistortion device in prior art.Such analog predistortion device can provide predistortion required gain extension characteristic, but it has, input vswr is poor, insertion loss large, debug complicated shortcoming, has hindered the practical application of analog predistortion device.
Summary of the invention
For the shortcoming existing in above-mentioned prior art, the purpose of this utility model is to provide one and can be used for the linearizing analog predistortion amplifier of radio-frequency (RF) power amplification.It is a kind of amplifier with gain extension characteristic, has that input vswr is little, insertion loss is little, debug simple advantage.
In order to reach foregoing invention object, the technical solution of the utility model realizes as follows:
Can be used for the linearizing analog predistortion amplifier of radio-frequency (RF) power amplification, its design feature is, it comprises carrier amplifier and the peak amplifier of Compositional balance structure, and the bias voltage of carrier amplifier and peak amplifier is different.The input of carrier amplifier is through 90 degree directional coupler ground connection, peak amplifier output through 90 degree directional coupler ground connection.
The utility model, owing to having adopted said structure, can provide power gain, can use the linearisation of carrying out power amplifier as analog predistortion device again, has good input vswr characteristic simultaneously.
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Accompanying drawing explanation
Fig. 1 is prior art digital pre-distortion system structural representation;
Fig. 2 is the structural representation of analog predistortion amplifier in prior art;
Fig. 3 is structural representation of the present utility model;
Fig. 4 is gain characteristic figure in the utility model embodiment.
Embodiment
Referring to Fig. 3, the utility model analog predistortion amplifier comprises carrier amplifier 1 and the peak amplifier 2 of Compositional balance structure, and carrier amplifier 1 is different with the bias voltage of peak amplifier 2.The input of carrier amplifier 1 is through 90 degree directional coupler 3 ground connection, peak amplifier 2 output through 90 degree directional coupler 3 ground connection.
In the utility model, due to carrier amplifier 1 and peak amplifier 2 Compositional balance amplifier architectures, sort circuit has good input standing wave.And different from balance amplifier common in prior art be, the bias voltage difference of these two amplifiers, have different unlatching power, therefore its total gain has the required gain extension characteristic of analog predistortion device, and its typical gain characteristic as shown in Figure 4.Use the utility model analog predistortion amplifier, can obtain the gain that exceedes 10 dB, compensation simultaneously exceedes the gain compression of 1.5dB, can significantly improve the linearity of power amplifier.
The utility model analog predistortion amplifier can be used for, in the emission systems such as radio communication base station, TV and radio emission machine, for the linearisation of power amplifier, and can providing power gain.
Claims (1)
1. can be used for the linearizing analog predistortion amplifier of radio-frequency (RF) power amplification, it is characterized in that, it comprises carrier amplifier (1) and the peak amplifier (2) of Compositional balance structure, carrier amplifier (1) is different with the bias voltage of peak amplifier (2), the input of carrier amplifier (1) is through 90 degree directional coupler (3) ground connection, peak amplifier (2) output through 90 degree directional coupler (3) ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320649428.XU CN203590158U (en) | 2013-10-22 | 2013-10-22 | Analog pre-distorting amplifier capable of being used for linearization of radio frequency power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320649428.XU CN203590158U (en) | 2013-10-22 | 2013-10-22 | Analog pre-distorting amplifier capable of being used for linearization of radio frequency power amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203590158U true CN203590158U (en) | 2014-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320649428.XU Expired - Fee Related CN203590158U (en) | 2013-10-22 | 2013-10-22 | Analog pre-distorting amplifier capable of being used for linearization of radio frequency power amplifier |
Country Status (1)
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| CN (1) | CN203590158U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104579186A (en) * | 2013-10-22 | 2015-04-29 | 北京同方吉兆科技有限公司 | Analog predistortion amplifier suitable for radiofrequency power amplifier linearization |
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2013
- 2013-10-22 CN CN201320649428.XU patent/CN203590158U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104579186A (en) * | 2013-10-22 | 2015-04-29 | 北京同方吉兆科技有限公司 | Analog predistortion amplifier suitable for radiofrequency power amplifier linearization |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140507 Termination date: 20191022 |