CN106374860A - Doherty power amplifier based on voltage synthesis structure - Google Patents
Doherty power amplifier based on voltage synthesis structure Download PDFInfo
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- CN106374860A CN106374860A CN201610738166.2A CN201610738166A CN106374860A CN 106374860 A CN106374860 A CN 106374860A CN 201610738166 A CN201610738166 A CN 201610738166A CN 106374860 A CN106374860 A CN 106374860A
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- power amplifier
- voltage
- amplifier
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Classifications
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- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/432—Two or more amplifiers of different type are coupled in parallel at the input or output, e.g. a class D and a linear amplifier, a class B and a class A amplifier
-
- 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
- H03F2203/21139—An impedance adaptation circuit being added at the output of a power amplifier stage
Abstract
The invention discloses a Doherty power amplifier based on a voltage synthesis structure. The Doherty power amplifier is equipped with a voltage synthesis network module. The voltage synthesis network module is connected with output ends of a carrier amplifier and a peaking amplifier and is used for synthesizing four ways of power amplifier outputs, converting differential signals into single end signals and finishing impedance matching. The carrier amplifier and the peaking amplifier are used for amplifying the input differential signals. Compared with existing current synthesis, the Doherty power amplifier has the advantages that the output impedance is 8 times of that of a current synthesis structure, it is easier to match 50 ohms, the bandwidth is wider, the loss is less, and finally, the power amplifier has higher output power and efficiency at an output power back-off point.
Description
Technical field
The invention belongs to wireless communication technology field, more particularly, to a kind of doherty power based on voltage composite structure
Amplifier.
Background technology
At present, the power amplifier in wireless communication system is very important unit, and the output of this module is direct
The scope of impact transmitter radiation, the interference magnitude to adjacent channel for the linear degree impact.Power amplifier is in transmitter system
In be power consumption the most unit, its efficiency directly affects the overall efficiency of this system.This index should in this highly energy-consuming in base station
Used time is particularly paid attention to.With the development of wireless communication technology, that has especially arrived present 4g technology occurs so that becoming increasingly complex
Modulation technique is suggested, and these modulation techniques directly results in the high peak-to-average power ratio of signal, for conventional power amplifier,
Requirement for obtaining the preferable linearity works it is necessary to be under big back-off state, which results in low-down efficiency,
In order to realize the requirement that the efficiency under rollback situation improves and meets the linearity, doherty power amplifier is widely used.
Traditional doherty structure is made up of 2 power amplifiers: a main power amplifier, an auxiliary power amplifier, main power amplifier (this power amplifier
Also referred to as carrier amplifier) it is operated in b class or ab class, (this power amplifier is also referred to as peak to auxiliary power amplifier
Amplifier) it is operated in c class.Two power amplifiers do not take turns to operate, but carrier amplifier works always,
Peaking amplifier just works to the peak value setting.Carrier amplifier 90 ° of quatrter-wavelength lines below
It is that impedance converts it is therefore an objective to when peaking amplifier works, play the apparent impedance of carrier amplifier
The effect that reduces it is ensured that when peaking amplifier work and the active load impedance step-down that forms of circuit below,
So carrier amplifier output current just becomes big.There is quarter-wave due to after carrier amplifier
Line, in order that two power amplifiers export homophase, is also required to 90 ° of phase shifts before peaking amplifier.Main power amplifier is operated in b
Class, when input signal is smaller, only main power amplifier is in running order；When the output voltage of pipe reaches peak value saturation
During point, theoretic efficiency can reach 78.5%.If at this time add excitation be twice, then, pipe is reaching peak value
Occur as soon as during half and be saturated, efficiency also reaches the 78.5% of maximum, now auxiliary power amplifier also begins to work together with main amplifier
Make (c class, thresholding is set to the half of excitation signal voltage).The introducing of auxiliary power amplifier is so that from the point of view of main power amplifier, load
Reduce, because auxiliary power amplifier functions as, to load, a negative impedance of having contacted, even if the output electricity of main power amplifier
Pressure saturation is constant, but output is because the reduction of load persistently increases (electric current flowing through load becomes big).Sharp when reaching
During the peak value encouraged, auxiliary power amplifier has also reached the maximum point of oneself efficiency, and the efficiency that two such power amplifier is combined is just much
Efficiency higher than single b class power amplifier.The maximal efficiency 78.5% of single b class power amplifier at peak value, present 78.5% effect
Rate occurs as soon as in the half of peak value.So this system structure can reach very high efficiency, and (each amplifier all reaches maximum
Delivery efficiency).For the doherty power amplifier of traditional electric current synthesis type, in carrier amplifier and
Under the conditions of peaking amplifier selects the same transistor, in maximum output power point, its output current is each road
2 times of electric current, the voltage on output voltage and each road is identical, thus output impedance is the 1/2 of each road resistance value.Typically
For, in the case of high-output power, the output impedance of transistor is often smaller.By this less resistance value 1/
2 when matching 50 ohm, it will introduces larger output matching loss, thus reducing output and efficiency, with Time Bandwidth
Can be restricted.In microwave frequency band, output is precious, it is desirable to power consumption as few as possible is in output matching net
On network.
It is excessive to there is output impedance transformation ratio in traditional doherty structure, and output matching network loss is excessive, under output
Fall and efficiency decline, the problem of Bandwidth-Constrained.
Content of the invention
It is an object of the invention to provide a kind of doherty power amplifier based on voltage composite structure is it is intended to solve
It is excessive to there is output impedance transformation ratio in traditional doherty structure, and output matching network loss is excessive, and output declines and efficiency
Decline, the problem of Bandwidth-Constrained.
The present invention is achieved in that a kind of doherty power amplifier based on voltage composite structure, described based on electricity
The doherty power amplifier being pressed into structure is provided with voltage synthesis mixed-media network modules mixed-media；
Described voltage synthesizes mixed-media network modules mixed-media, is connected with carrier amplifier and peak amplifier output terminal, for synthesizing four tunnels
Power amplifier exports, and differential signal is changed into single-ended signal and completes impedance matching.
Further, described voltage synthesis mixed-media network modules mixed-media has four input ports and a radio frequency output port, four inputs
Port is connected with carrier amplifier and peak amplifier output terminal respectively, for synthesizing four road power amplifier outputs, difference is believed simultaneously
Number it is changed into single-ended signal and complete impedance matching.
Further, described voltage synthesis mixed-media network modules mixed-media adopts two transformators, and the input of transformator is in parallel, transformator
Outfan series connection.
Further, described voltage synthesis mixed-media network modules mixed-media is multiplied by two differential pairs, and connect power supply is chopped-off head coil, and remaining cries
Secondary coil；The output of each differential pair is connected on the chopped-off head coil of a transformator, and the secondary coil of transformator is then gone here and there
Connection gets up, and the voltage swing in load is the voltage swing sum on each transformer secondary coil；Supply voltage is from transformator
The central point of chopped-off head coil accesses, and the voltage swing on chopped-off head coil is 4vdd, the electricity flowing through in chopped-off head coil and secondary coil
Flow valuve is equal, realizes input impedance r to the coupling of output impedance 4r.
Further, described carrier amplifier and peak amplifier, for amplifying the differential signal of input.
Another object of the present invention is to provide being put based on the doherty power of voltage composite structure described in a kind of being provided with
The transmitter system of big device.
Another object of the present invention is to providing a kind of wireless communication system being provided with described transmitter system.
The doherty power amplifier based on voltage composite structure that the present invention provides, is provided with voltage synthesis network mould
Block, compared with the synthesis of existing electric current, output impedance be electric current synthesis 8 times of framework it is easier to match 50 ohm, have more
Wide bandwidth and less loss, thus final power amplifier has higher rollback point output power and efficiency, its test result
As shown in Figure 2 from test result as can be seen that in peak power point the efficiency of this power amplifier be 32%, in output
At 6db rollback point, efficiency is 25%, compares at peak power point, its efficiency is reduced only by 7%.The power amplification of traditional structure
Device, at output 6db rollback point, efficiency often declines up to more than 15%.Table 1 is this based on voltage composite structure
The performance comparison table of doherty power amplifier power amplifier based on electric current composition principle with tradition.Permissible from contrast table
Find out that at output 6db rollback point, there is the efficiency drop-out value of minimum using the power amplifier of voltage composite structure.
Brief description
Fig. 1 is that the connection of the doherty power amplifier circuit based on voltage composite structure provided in an embodiment of the present invention is shown
It is intended to.
Fig. 2 is test result schematic diagram provided in an embodiment of the present invention.
Fig. 3 is the doherty power amplifier structure schematic diagram based on voltage composite structure provided in an embodiment of the present invention；
In figure: 1, carrier amplifier；2nd, peak amplifier；3rd, voltage synthesis mixed-media network modules mixed-media.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not used to
Limit the present invention.
Below in conjunction with the accompanying drawings the structure of the present invention is explained in detail.
As shown in figure 3, being included based on the doherty power amplifier of voltage composite structure of the embodiment of the present invention: carrier wave
Amplifier (carrier amplifier) 1, peak amplifier (peaking amplifier) 2, voltage synthesis mixed-media network modules mixed-media 3.
Carrier amplifier (carrier amplifier) 1 and peak amplifier (peaking amplifier) 2, are used for putting
The differential signal of big input.
Voltage synthesizes mixed-media network modules mixed-media 3, is connected with carrier amplifier1 and peaking amplifier2 outfan,
For synthesizing four road power amplifier outputs, differential signal is changed into single-ended signal and completes impedance matching.
Described voltage synthesis mixed-media network modules mixed-media has four input ports and a radio frequency output port, and four input ports are respectively
Be connected with carrier amplifier and peaking amplifier outfan, for synthesizing four road power amplifiers outputs, simultaneously
Differential signal is changed into single-ended signal and completes impedance matching.This voltage synthesis network employs two transformators, these transformations
The input of device is in parallel, and the amplitude of oscillation of input terminal voltage is limited by breakdown voltage transistor, but the outfan of transformator
It is series connection, therefore the voltage on power amplifier load can be multiplied.This voltage synthesis network is by two differential pair groups
Become, wherein connect power supply is chopped-off head coil, and remaining is secondary coil.The output of each differential pair is connected to a transformator
Chopped-off head coil on, and the secondary coil of transformator is then together in series, and the voltage swing in load is each transformer secondary output line
Voltage swing sum on circle.Supply voltage accesses from the central point of transformator chopped-off head coil, the voltage swing on chopped-off head coil
For 4vdd it is assumed that transformator adopts the conversion ratio of 1:1, the voltage swing in load is 16vdd, and the voltage swing in load is carried
High 4 times.Due to the coupling in magnetic field, the current value flowing through in chopped-off head coil and secondary coil is equal, it is achieved thereby that defeated
Enter impedance r to the coupling of output impedance 4r.
Below in conjunction with the accompanying drawings the application principle of the present invention is explained in detail.
The embodiment of the present invention four road power amplifiers are had based on the doherty power amplifier of voltage composite structure, as Fig. 3 institute
Show.Input single-ended signal, is changed into 2 pairs of differential signals after input power division network, carrier amplifier and
Peaking amplifier is made up of 2 tunnel difference power amplifiers respectively.After the differential signal of input amplifies through power amplifier,
Outfan adopts a voltage polymer fabric complexation to become.This voltage synthesizes the output that network one side can synthesize four road power amplifiers, with
When differential signal can also be changed into single-ended signal, and also the effect of impedance matching can be completed.The output electricity of the present invention
Press as each road power amplifier output voltage sum, the electric current on output current and each road is equal, thus output impedance is that each road is defeated
Go out impedance sum.Compared to the framework of electric current synthesis, output impedance synthesizes 8 times of framework for electric current, thus being easier to match
50 ohm, there is broader bandwidth and less loss, thus final power amplifier have at output rollback point higher
Output and efficiency.
Its test result as shown in Figure 2 from test result as can be seen that in peak power point this power amplifier effect
Rate is 32%, and at output 6db rollback point, efficiency is 25%,
Compare at peak power point, its efficiency is reduced only by 7%.The power amplifier of traditional structure,
At output 6db rollback point, efficiency often declines up to more than 15%.
Table 1 is the work(with tradition based on electric current composition principle for this doherty power amplifier based on voltage composite structure
The performance comparison table of rate amplifier.From contrast table as can be seen that at output 6db rollback point, using voltage composite structure
Power amplifier have minimum efficiency drop-out value.
Table 1
[1]c.wang,m.vaidyanathan,and l.e.larson,“a capacitance compensation
technique for improved linearity in cmos class-ab power amplifiers,”ieee
j.solid-state circuits.,vol.39,no.11,pp.1927–1937,nov.2004.
[2]b.koo,y.na,and s.hong,“integrate bias circuits of rf cmos cascode
power amplifier for linearity enhancement,”ieee trans.microw.theory tech.,
vol.60,no.2,pp.340–351,feb.2012.
[3]k.y.son,b.koo,and s.hong,“a cmos power amplifier with a built-in
rf predistorter for handset applications,”ieee trans.microw.theory tech.,
vol.60,no.8,pp.2571–2580,aug.2012.
[4]h.jeon,k.lee,o.lee,k.an,y.yoon,h.kim,k.w.kobayashi,c.lee,and
j.s.kenney,“a cascode feedback bias technique for linear cmos power
amplifiers in a multistage cascode topology,”ieee trans.microw.theory tech.,
vol.61,no.2
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (7)
1. a kind of doherty power amplifier based on voltage composite structure it is characterised in that described based on voltage composite structure
Doherty power amplifier be provided with voltage synthesis mixed-media network modules mixed-media；
Described voltage synthesizes mixed-media network modules mixed-media, is connected with carrier amplifier and peak amplifier output terminal, for synthesizing four road power amplifiers
Output, is changed into single-ended signal differential signal and completes impedance matching.
2. the doherty power amplifier based on voltage composite structure as claimed in claim 1 is it is characterised in that described electricity
Being pressed into mixed-media network modules mixed-media has four input ports and a radio frequency output port, four input ports respectively with carrier amplifier and
Peak amplifier output terminal connects, and for synthesizing four road power amplifier outputs, differential signal is changed into single-ended signal simultaneously and completes
Impedance matching.
3. the doherty power amplifier based on voltage composite structure as claimed in claim 1 is it is characterised in that described electricity
It is pressed into mixed-media network modules mixed-media and adopts two transformators, the input of transformator is in parallel, the outfan series connection of transformator.
4. the doherty power amplifier based on voltage composite structure as claimed in claim 1 is it is characterised in that described electricity
It is pressed into mixed-media network modules mixed-media and is multiplied by two differential pairs, connect power supply is chopped-off head coil, and remaining is secondary coil；Each differential pair
Output be connected on the chopped-off head coil of a transformator, the secondary coil of transformator is then together in series, the voltage swing in load
Width is the voltage swing sum on each transformer secondary coil；Supply voltage accesses from the central point of transformator chopped-off head coil,
Voltage swing on chopped-off head coil is 4vdd, and the current value flowing through in chopped-off head coil and secondary coil is equal, realizes input impedance r
Coupling to output impedance 4r.
5. the doherty power amplifier based on voltage composite structure as claimed in claim 1 is it is characterised in that described load
Twt amplifier and peak amplifier, for amplifying the differential signal of input.
6. a kind of transmitter system being provided with the doherty power amplifier based on voltage composite structure described in claim 1.
7. a kind of wireless communication system being provided with transmitter system described in claim 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610738166.2A CN106374860A (en) | 2016-08-26 | 2016-08-26 | Doherty power amplifier based on voltage synthesis structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610738166.2A CN106374860A (en) | 2016-08-26 | 2016-08-26 | Doherty power amplifier based on voltage synthesis structure |
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| CN201610738166.2A Pending CN106374860A (en) | 2016-08-26 | 2016-08-26 | Doherty power amplifier based on voltage synthesis structure |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108768308A (en) * | 2018-05-16 | 2018-11-06 | 清华大学 | Asymmetric Doherty power amplifier based on transistor stack structure |
| CN109889163A (en) * | 2019-02-27 | 2019-06-14 | 上海华虹宏力半导体制造有限公司 | Doherty power amplifier based on transformer |
| CN112710885A (en) * | 2020-12-18 | 2021-04-27 | 北京北方华创微电子装备有限公司 | Radio frequency sensor, matcher, matching parameter determining method and semiconductor equipment |
| CN112771778A (en) * | 2018-11-30 | 2021-05-07 | 华为技术有限公司 | Power amplifier circuit |
| CN113114153A (en) * | 2021-04-09 | 2021-07-13 | 成都通量科技有限公司 | Broadband high-isolation power divider chip |
| CN114050792A (en) * | 2022-01-10 | 2022-02-15 | 深圳飞骧科技股份有限公司 | Novel broadband Doherty radio frequency power amplifier |
| CN115940850A (en) * | 2023-02-23 | 2023-04-07 | 深圳飞骧科技股份有限公司 | Current synthesis type novel Doherty power amplifier |
| CN117176095A (en) * | 2023-08-31 | 2023-12-05 | 芯百特微电子(无锡)有限公司 | Input power self-adaptive distribution Doherty power amplifier |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108768308A (en) * | 2018-05-16 | 2018-11-06 | 清华大学 | Asymmetric Doherty power amplifier based on transistor stack structure |
| CN108768308B (en) * | 2018-05-16 | 2020-06-12 | 清华大学 | Asymmetric Doherty power amplifier based on transistor stacked structure |
| CN112771778A (en) * | 2018-11-30 | 2021-05-07 | 华为技术有限公司 | Power amplifier circuit |
| EP3855619A4 (en) * | 2018-11-30 | 2021-08-25 | Huawei Technologies Co., Ltd. | Power amplifier circuit |
| CN109889163A (en) * | 2019-02-27 | 2019-06-14 | 上海华虹宏力半导体制造有限公司 | Doherty power amplifier based on transformer |
| CN112710885A (en) * | 2020-12-18 | 2021-04-27 | 北京北方华创微电子装备有限公司 | Radio frequency sensor, matcher, matching parameter determining method and semiconductor equipment |
| CN113114153A (en) * | 2021-04-09 | 2021-07-13 | 成都通量科技有限公司 | Broadband high-isolation power divider chip |
| CN114050792A (en) * | 2022-01-10 | 2022-02-15 | 深圳飞骧科技股份有限公司 | Novel broadband Doherty radio frequency power amplifier |
| CN115940850A (en) * | 2023-02-23 | 2023-04-07 | 深圳飞骧科技股份有限公司 | Current synthesis type novel Doherty power amplifier |
| CN115940850B (en) * | 2023-02-23 | 2023-05-23 | 深圳飞骧科技股份有限公司 | Novel Doherty power amplifier of current synthesis formula |
| CN117176095A (en) * | 2023-08-31 | 2023-12-05 | 芯百特微电子(无锡)有限公司 | Input power self-adaptive distribution Doherty power amplifier |
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