CN208158549U - High Linear offsets structure - Google Patents
High Linear offsets structure Download PDFInfo
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- CN208158549U CN208158549U CN201820425499.4U CN201820425499U CN208158549U CN 208158549 U CN208158549 U CN 208158549U CN 201820425499 U CN201820425499 U CN 201820425499U CN 208158549 U CN208158549 U CN 208158549U
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- 230000009021 linear effect Effects 0.000 title claims abstract description 33
- 239000003990 capacitor Substances 0.000 claims description 9
- 230000005611 electricity Effects 0.000 claims 1
- 238000000034 method Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 238000004891 communication Methods 0.000 description 7
- 230000003321 amplification Effects 0.000 description 6
- 238000003199 nucleic acid amplification method Methods 0.000 description 6
- 229910002601 GaN Inorganic materials 0.000 description 2
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 2
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Abstract
The utility model discloses a kind of High Linears to offset structure comprising：It includes the power splitter with RF signal input end, the first amplifier, the second amplifier, phase shifter, the synthesizer with signal output end；Output signal is divided into two-way by the power splitter, the signal output end all the way of the power splitter is connected to the first amplifier, another signal output end of power splitter is connected to phase shifter, and the phase shifter is connected to the second amplifier, and second amplifier out is connected to synthesizer.It is solved the problems, such as when the utility model is the case where meeting efficiency requirements linear inadequate.
Description
Technical field
The utility model relates to the linear technique fields of multi-field communication, offset structure more particularly, to a kind of High Linear,
It is related in the communication repeater stations amplification module such as CDMA, WCDMA and TD-LTE, for improving the linearity of power amplifier.
Background technique
In communication system, communication quality and coverage area and equipment size all depend primarily on power amplifier.And lead to
The final power amplifier of power amplifier is from material and manufacturing process in letter system, mainly have LDMOS pipe, GaAs pipe and
Gallium nitride pipe three types.Preferably still efficiency is slightly lower for the linear index of GaAs pipe, and cost is also not satisfactory, so being not suitable for
It is used in repeater, the linear and efficiency index of gallium nitride pipe is all not bad, but high expensive, also fails to a large amount of in repeater
It uses, and LDMOS pipe is evolved by first generation semiconductor, cost is relatively low for it, and early stage is linear not so good, but with communication system
Upgrading and later period itself technique continuously improve, at present or the mainstream configuration of Mobile communication direct base station.
The linear and efficiency of power amplifier can not get both as bear's paw just as fish.The two indexs, which always are, penetrates
The target that frequency designer chases stresses a side sometimes, mutually balances sometimes.And in entire radio frequency system intermediate power amplifier
The two indexs directly influence the volume and linearization performance of complete machine again, it is seen that the importance of the two indexs.
For the linear of power amplifier, elder generation take many means, also obtain satisfied effect.
It is broadly divided into rollback method, feed forward approach, pre-distortion method, rollback method for the method for linear target improvement at present
The output power of former power amplifier is reduced, signal drops to half or the output of more small-power, and it is extra not need additionally to increase
Device meets index request by rollback the disadvantage is that sacrificing efficiency, is the optimal selection of middle low power amplifier.And feed forward approach
It is most complicated ameliorative way, introduces signal from output, first reversely refilter main signal, master is offseted after distorted signal is amplified and is put
The distorted signal of big device, this method effect be also most it will be evident that but high expensive, and when producing in enormous quantities index consistency
It is not high.
For in terms of efficiency, has to sacrifice point if deliberately improving efficiency that linearly, also to improve sometimes
The cost of power amplifier.Doherty technology is evolved by two-way balance amplifier, its efficiency is than normal equilibrium formula power
Amplifier will at least improve 15%, but linear index will similarly decline very much, need that predistorter is cooperated to be remedied, ability
Reach satisfied result.
With the increase of communication and data service, Conventional power amplifiers have been difficult to meet application demand.Substantially institute
Radio-frequency power amplifier be all it is nonlinear, can all have non-linear distortion signal.When output power is smaller, linearly refer to
It marks, but low efficiency.And output power it is larger when, high-efficient, linear index is but with being degrading.The utility model is exactly full
It is solved the problems, such as when the case where sufficient efficiency requirements linear inadequate.
Utility model content
The purpose of this utility model is exactly to solve the above-mentioned problems, to provide a kind of High Linear and offset structure, meeting
It is solved the problems, such as when the case where efficiency requirements linear inadequate.
In order to solve the above technical problems, the utility model, which provides a kind of High Linear, offsets structure comprising：It includes tool
There are power splitter, the first amplifier, the second amplifier, phase shifter, the synthesizer with signal output end of RF signal input end；
Output signal is divided into two-way by the power splitter, and the signal output end all the way of the power splitter is connected to the first amplifier, power splitter
Another signal output end be connected to phase shifter, the phase shifter is connected to the second amplifier, and second amplifier out connects
It is connected to synthesizer.
Compared with prior art, High Linear provided by the utility model offsets structure in practice, and signal enters function
Function is divided into two-way after putting device, enters main power amplifier all the way, and main power amplifier work linearly refers in slightly biased high-efficient conventional sense
Indicate deterioration.In addition all the way enter cancellation amplifier, the power grade of a cancellation amplifier rank smaller than main power amplifier,
Cancellation amplifier works in the nonlinear state of saturation, is distorted very serious.And enter the signal and main signal of cancellation amplifier
Opposite in phase, final two paths of signals enter combiner, and the distorted signal of the main power amplifier of signal cancellation of cancellation amplifier output reaches
Improve linear target.
Further, first amplifier includes capacitance C1, power amplifier A1, inductance L1, capacitor C2；
Second amplifier includes capacitance C4, inductance L3, offsets amplifier A2, inductance L4, capacitance C5；
The two-way output end of power splitter PD is connected with one end of capacitance C1, phase shifter PS respectively, the capacitance
The other end of C1 is connect with the input terminal of the one end inductance L2 and power amplifier A1, the first amplifier of another termination of inductance L2
The source level of negative voltage VG1, power amplifier A1 are grounded, one end phase of the output end and inductance L1 and capacitor C2 of power amplifier A1
It connects, the other end of another termination the first amplifier positive voltage VD1, the capacitor C2 of inductance L1 engage the input for the S that grows up to be a useful person
Interface；
Another one end for being terminated at capacitance C4 of the phase shifter PS, the capacitance C4 other end and the one end inductance L3
And offset amplifier A2 input terminal and be connected, the negative voltage VG2 of the second amplifier of another termination of the inductance L3, the counteracting is put
The source level ground connection of big device A2, offsets amplifier A2 output end and connect respectively with one end of inductance L4, capacitance C5, the inductance
The other end of the positive voltage VD2, the capacitance C5 of the second amplifier of another termination of L4 engage the another way input for the S that grows up to be a useful person
End；
High Linear signal after the output end output offset of the synthesizer S.
The utility model is primarily adapted for use in high power amplifier, and the linear structure (technology) that offsets is mainly by main power
Amplifier (the first amplifier) and offset power amplifier (the second amplifier) composition.Main power amplifier and offset power amplification
The two paths of signals amplitude of device output is different, and phase is also opposite.Offset small-power distorted signal and the master of power amplifier output
The distorted signal of power amplifier output is cancelled out each other, and influences smaller, distorted signal amplitude meeting to the power of useful signal output
What is improved is obvious.
In practice, function is divided into two-way after signal enters power amplifier, enters main power amplifier, main power amplifier work all the way
In slightly biased high-efficient conventional sense, linear index has deterioration.In addition enter cancellation amplifier, the power of cancellation amplifier all the way
A grade rank smaller than main power amplifier, cancellation amplifier work in the nonlinear state of saturation, are distorted very serious.And
Into the signal and main signal opposite in phase of cancellation amplifier, final two paths of signals enters combiner, cancellation amplifier output
The distorted signal of the main power amplifier of signal cancellation reaches and improves linear target.
Detailed description of the invention
Fig. 1 is that High Linear offsets structural principle block diagram；
Fig. 2 is that High Linear offsets structure detailed circuit diagram.
Specific embodiment
In order to be easy to understand the technical means, creative features, achievement of purpose, and effectiveness of the utility model, under
In conjunction with specific embodiments, the utility model is further described in face.
The embodiments of the present invention provides a kind of High Linear and offsets structure, referring to Fig. 1 comprising：It includes tool
There are power splitter, the first amplifier, the second amplifier, phase shifter, the synthesizer with signal output end of RF signal input end；
Output signal is divided into two-way by the power splitter, and the signal output end all the way of the power splitter is connected to the first amplifier, power splitter
Another signal output end be connected to phase shifter, the phase shifter is connected to the second amplifier, and second amplifier out connects
It is connected to synthesizer.
The utility model is described in detail below with reference to Fig. 2：
As can be seen from Figure 2, first amplifier includes capacitance C1, power amplifier A1, inductance L1, capacitor C2；
And second amplifier includes capacitance C4, inductance L3, offsets amplifier A2, inductance L4, capacitance C5；
The connection relationship of first amplifier and the second amplifier and power splitter PD, synthesizer S etc. are described below.
Referring to fig. 2, the two-way output end of power splitter PD is connected with one end of capacitance C1, phase shifter PS respectively, described
The other end of capacitance C1 is connect with the input terminal of the one end inductance L2 and power amplifier A1, another termination first of inductance L2
The source level of the negative voltage VG1 of amplifier, power amplifier A1 are grounded, the output end and inductance L1 and capacitor C2 of power amplifier A1
One end connect, the engagement of the other end of another termination the first amplifier positive voltage VD1, the capacitor C2 of inductance L1 grows up to be a useful person S's
One input interface,.
Another one end for being terminated at capacitance C4 of the phase shifter PS, the capacitance C4 other end and the one end inductance L3
And offset amplifier A2 input terminal and be connected, the negative voltage VG2 of the second amplifier of another termination of the inductance L3, the counteracting is put
The source level ground connection of big device A2, offsets amplifier A2 output end and connect respectively with one end of inductance L4, capacitance C5, the inductance
The other end of the positive voltage VD2, the capacitance C5 of the second amplifier of another termination of L4 engage the another way input for the S that grows up to be a useful person
End.High Linear signal after the output end output offset of the synthesizer S.
Radiofrequency signal is divided into two-way after entering power splitter PD, and signal is after capacitance C1 by power amplifier A1 all the way
Amplification, negative voltage VG1 and positive voltage VD1 pass through inductance L2 and inductance L1 respectively and power to power amplifier A1, after amplification
Useful signal pass through capacitance C2 again and enter combiner S (i.e. the synthesizer S of Fig. 1).The another way letter of power splitter PD output
It number first passes through after phase shifter PS to enter after approach capacitance C4 again and offsets amplifier A2, offset amplifier A2 work in small-power
Saturation distortion state, and the signal for entering counteracting amplifier A2 is the signal overturn by phase shifter PS, offsets amplifier A2
The distorted signal of output enters the useful signal neutralization that combiner S and power amplifier A1 is exported after passing through capacitance C5, loses
True signal counteracts fraction useful signal, and the distorted signal of main signal is also eliminated, so that it may improve to greatest extent
Linearly, achieve the effect that High Linear offsets.
When using, the difference power offseted between power amplifier and main power amplifier is suitable, and general main power is put
Big device performance number is ten times of cancellation amplifier performance number.If the too big signal for offseting power amplifier output of difference compared with
It is small, it is not enough to offset the distorted signal of main power amplifier, it may appear that the unconspicuous situation of improvement.And if offseting power
Amplifier output signal is excessive, after being completely counterbalanced by the distorted signal of main power amplifier, there are also more remaining offseting signal, this
When, the effect of counteracting is not had not only, also will affect the efficiency of entire power amplifier.
The useful signal of main power amplifier output is slightly distorted, and cancellation amplifier exports complete distorted signal.Phase shifter PS
It is also an important link, the size of phase-shift phase directly affects the effect of counteracting, and it is excellent not have counteracting when having big difference not only
The effect of change, or even the case where also will cause secondary disturbance indicator.The phase-shift phase of phase shifter is according to the first amplifier and second
Amplifier enters the phase decision of combiner, and the phase that amplifier input is offset by adjusting the second link makes main power amplification
Device and the two paths of signals for offseting power amplifier output must assure that 180 ° ± 5 ° of phase phase difference when entering combiner S, deviation
The effect of smaller counteracting will be better.The utility model cancellation techniques effect is more apparent, and it is simple that circuit compares predistortion circuit, easily
In realization.
The utility model for improving power for putting in the communication repeater stations amplification modules such as CDMA, WCDMA and TD-LTE
The linearity of big device.
It will be understood by those skilled in the art that the respective embodiments described above are to realize the specific implementation of the utility model
Example, and in practical applications, can to it, various changes can be made in the form and details, without departing from the spirit of the utility model
And range.
Claims (2)
1. a kind of High Linear offsets structure, which is characterized in that it includes：It include the power splitter with RF signal input end,
First amplifier, the second amplifier, phase shifter, the synthesizer with signal output end；
Output signal is divided into two-way by the power splitter, and the signal output end all the way of the power splitter is connected to the first amplifier, function
Another signal output end of device is divided to be connected to phase shifter, the phase shifter is connected to the second amplifier, the second amplifier output
End is connected to synthesizer.
2. High Linear according to claim 1 offsets structure, which is characterized in that first amplifier includes capacitance
C1, power amplifier A1, inductance L1, capacitor C2；
Second amplifier includes capacitance C4, inductance L3, offsets amplifier A2, inductance L4, capacitance C5；
The two-way output end of power splitter PD is connected with one end of capacitance C1, phase shifter PS respectively, the capacitance C1's
The other end is connect with the input terminal of the one end inductance L2 and power amplifier A1, the negative electricity of the first amplifier of another termination of inductance L2
VG1, the source level ground connection of power amplifier A1 are pressed, the output end of power amplifier A1 connects with one end of inductance L1 and capacitor C2,
The input that the other end of another termination the first amplifier positive voltage VD1, the capacitor C2 of inductance L1 engage the S that grows up to be a useful person connects
Mouthful；
Another one end for being terminated at capacitance C4 of the phase shifter PS, the capacitance C4 other end and the one end inductance L3 and is supported
The amplifier A2 input terminal that disappears is connected, the negative voltage VG2 of the second amplifier of another termination of the inductance L3, the counteracting amplifier
The source level of A2 is grounded, and is offset amplifier A2 output end and is connect respectively with one end of inductance L4, capacitance C5, the inductance L4's
The other end of the positive voltage VD2, the capacitance C5 of the second amplifier of another termination engage the another way input terminal for the S that grows up to be a useful person；
High Linear signal after the output end output offset of the synthesizer S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820425499.4U CN208158549U (en) | 2018-03-28 | 2018-03-28 | High Linear offsets structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820425499.4U CN208158549U (en) | 2018-03-28 | 2018-03-28 | High Linear offsets structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208158549U true CN208158549U (en) | 2018-11-27 |
Family
ID=64379169
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820425499.4U Expired - Fee Related CN208158549U (en) | 2018-03-28 | 2018-03-28 | High Linear offsets structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208158549U (en) |
-
2018
- 2018-03-28 CN CN201820425499.4U patent/CN208158549U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181127 |
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| CF01 | Termination of patent right due to non-payment of annual fee |