CN105915182A - Post-distortion linearized Doherty power amplifier based on ferroelectric capacitor - Google Patents
Post-distortion linearized Doherty power amplifier based on ferroelectric capacitor Download PDFInfo
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- CN105915182A CN105915182A CN201610225143.1A CN201610225143A CN105915182A CN 105915182 A CN105915182 A CN 105915182A CN 201610225143 A CN201610225143 A CN 201610225143A CN 105915182 A CN105915182 A CN 105915182A
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- interdigital
- microstrip line
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- power amplifier
- strip
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
- H03F1/0288—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers using a main and one or several auxiliary peaking amplifiers whereby the load is connected to the main amplifier using an impedance inverter, e.g. Doherty amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
Abstract
The invention discloses a post-distortion linearized Doherty power amplifier based on a ferroelectric capacitor. The power amplifier comprises a main power amplification module and an auxiliary power amplification module which are connected in parallel, wherein input ends of the main power amplification module and the auxiliary power amplification module are taken as a total input end of the Doherty power amplifier; a phase shift module is connected in series between the input end of the auxiliary power amplification module and a part input end; a phase shift module is connected in parallel between an output end of the main power amplification module and an output end of the auxiliary module; the output end of the main power amplification module is compensated by the phase shift module and then synthesized with the output end of the auxiliary power amplification module to form total output; the ferroelectric capacitor is connected in series between the input end of the auxiliary power amplification module and the phase shift module; and the ferroelectric capacitor is connected to an adjustable direct-current bias voltage. The power amplifier disclosed by the invention is characterized in that the direct-current bias voltage of the ferroelectric capacitor is changed, so that source-pull matching of the auxiliary power amplification module can be adjusted, and thus gain-compression distortion compensation can be implemented to main power amplification output.
Description
Technical field
The present invention relates to microwave circuits field, be specifically related to the high linearity of a kind of rear anti-aliasing techniques based on ferroelectric capacitor structure
Doherty power amplifier.
Background technology
Along with development and the constantly progress of wireless telecommunications, peak-to-average force ratio is required more and more higher by many modulation systems, and therefore power amplifier is linear
Degree seems more and more important, in order to obtain the higher linearity, generally uses the method such as power amplifier rollback and feedforward, and these methods will be led
Cause the relatively low efficiency of power amplifier and complicated structure.In Doherty (Doherty) power amplifier scheme, obtain simultaneously higher efficiency and
The preferably linearity is relatively difficult.
At present, in direction research both domestic and external, under the conditions of holding is high efficiency, improves the Doherty linearity, generally uses pre-
The mode of distortion, but pre-distortion technology needs substantial amounts of digital circuit to coordinate, and microwave circuit and intermediate-frequency circuit the most easily produce
The crosstalk of signal, structure is the most more complicated, and the use in present wireless system base-station will be very restricted.At high power bar
Under part, in Doherty power amplifier, the gain compression distortion of main power amplifier cannot solve all the time, and this largely constrains Doherty merit
Put the raising of the linearity.
Ferroelectric capacitor structure has makes the dielectric constant of material change by adjustment DC bias field, so that the capacitance of ferroelectric capacitor
Change, it is possible to achieve power amplifier match circuit adjustable.Along with system adjustable and the continuous of miniaturization are wanted by wireless telecommunication system
Ask, use adjustable ferroelectric capacitor technology to realize high linearity Doherty power amplifier and will have wide practical value.
Summary of the invention
In view of this, it is an object of the invention to provide a kind of post-distortion linearization Doherty power amplifier based on ferroelectric capacitor, this structure has
With good grounds demand, utilizes adjustable ferroelectric capacitor to carry out the source traction coupling of auxiliary power amplifier, so that the Doherty power amplifier linearity
Improved.
It is an object of the invention to be achieved through the following technical solutions, a kind of post-distortion linearization Doherty merit based on ferroelectric capacitor
Putting, the input including the main power amplifier module being connected in parallel and auxiliary power amplifier module, described main power amplifier module and auxiliary power amplifier module is made
For total input of Doherty power amplifier, between the input of auxiliary power amplifier module with portion's input, it is connected in series with phase shifting formwork
Block, is connected in parallel to phase shift module between the outfan of main power amplifier module and the outfan of supplementary module, the outfan of main power amplifier module leads to
Cross and after synthesizing with auxiliary power amplifier outfan after phase shift module compensates, become total output, the input of described auxiliary power amplifier module and phase shifting formwork
Also being connected in series with ferroelectric capacitor between block, this ferroelectric capacitor connects adjustable Dc bias.
Further, described ferroelectric capacitor includes having the inner opening ring part of upper shed and under shed, the outward opening annular that Open Side Down
Portion, the first interdigital microstrip line unit and the second interdigital microstrip line unit, described inner opening ring part and outward opening ring part all have a left side
Lower open end and bottom right open end, the lower-left open end of described inner opening ring part and the lower-left opening of outward opening ring part
Portion connects, and the bottom right open end of described inner opening ring part is connected with the bottom right open end in external-open degree of lip-rounding portion, described inner opening ring
The upper shed in shape portion and under shed form two curved portions separated, and two curved portions are oppositely arranged, two curved portions by be set up in parallel the
One interdigital microstrip line unit and the second interdigital microstrip line unit connect, and the first interdigital microstrip line unit and the second interdigital microstrip line unit divide
Do not connect bias voltage.
Further, described first interdigital microstrip line unit includes the first interdigital structure and the second interdigital structure, described first interdigital structure
With the second interdigital structure all include the first interdigital microstrip line and the second interdigital microstrip line, described first interdigital microstrip line include multiple mutually
By one and the between the first parallel and evenly distributed interdigital unit of strip, and multiple the first interdigital unit of strip being parallel to each other
The orthogonal first strip microstrip line of the one interdigital unit of strip connects；Described second interdigital microstrip line includes multiple be parallel to each other and all
Pitched with the second strip by one between the second interdigital unit of strip of even arrangement, and multiple the second interdigital unit of strip being parallel to each other
Refer to that the orthogonal second strip microstrip line of unit connects；The described first interdigital unit of strip and the interdigital unit of the second strip interlock two-by-two
Arrangement；The two ends of the second strip microstrip line of described first interdigital microstrip line and the two of the second strip microstrip line of the second interdigital microstrip line
End connects.
Further, described second interdigital microstrip line unit includes that third fork refers to structure and the 4th interdigital structure, and described third fork refers to structure
With the 4th interdigital structure all include third fork refer to microstrip line and the 4th interdigital microstrip line, described third fork refer to microstrip line include multiple mutually
By one and the between the parallel and evenly distributed interdigital unit of Article 3 shape, and multiple interdigital unit of Article 3 shape being parallel to each other
The interdigital unit of three strips orthogonal Article 3 shape microstrip line connects；Described 4th interdigital microstrip line includes multiple be parallel to each other and all
Pitched with Article 4 shape by one between the interdigital unit of Article 4 shape of even arrangement, and multiple interdigital unit of Article 4 shape being parallel to each other
Refer to that unit orthogonal Article 4 shape microstrip line connects；The described interdigital unit of Article 3 shape unit interdigital with Article 4 shape interlocks two-by-two
Arrangement；Described third fork refers to the two of the two ends of the Article 4 shape microstrip line of microstrip line and the Article 4 shape microstrip line of the 4th interdigital microstrip line
End connects.
Further, described main power model, auxiliary power module and phase shift module are layed on medium substrate, and described medium substrate is adopted
By Rogers 4350 medium, DIELECTRIC CONSTANT εrIt is 2 to 5, loss angle tangent tg σ≤10-3, thickness 0.254mm.
Further, described ferroelectric capacitor uses ferroelectricity barium strontium titanate ferroelectric material, dielectric constant 350, thickness 0.01mm.
Owing to have employed technique scheme, present invention have the advantage that:
The present invention by traditional Doherty (Doherty) power amplifier auxiliary power amplifier source traction match circuit in add adjustable ferrum
Electricity capacitance structure, it is achieved the Doherty power amplifier of High Linear；By changing the Dc bias of ferroelectric capacitor, it becomes possible to adjust auxiliary merit
The source traction coupling put, it is achieved the gain compression distortion compensation that main power amplifier is exported；Need not other complicated circuit additional, it is achieved merit
The high linearity put, volume is little is prone to integrated with other microwave circuit, has the strongest practicality and application prospect.
Accompanying drawing explanation
In order to make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is made the most in detail
Thin description, wherein:
Fig. 1 is the circuit diagram of present invention post-distortion linearization based on ferroelectric capacitor Doherty power amplifier；
Fig. 2 is the ferroelectric capacitor structure chart of present invention post-distortion linearization based on ferroelectric capacitor Doherty power amplifier；
Fig. 3 be the present invention ferroelectric capacitor structure in symmetrical interdigital microstrip line cellular construction figure；
Fig. 4 is the enlarged drawing in Fig. 3 at I.
Detailed description of the invention
Below with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail；Should be appreciated that preferred embodiment only for
The present invention is described rather than in order to limit the scope of the invention.
As it is shown in figure 1, a kind of post-distortion linearization Doherty power amplifier based on ferroelectric capacitor, including the main power amplifier module being connected in parallel
1 with auxiliary power amplifier module 2, the most defeated as Doherty power amplifier of described main power amplifier module and the input of auxiliary power amplifier module
Entering end, be connected in series with phase shift module between input and portion's input of auxiliary power amplifier module, the outfan of main power amplifier module is with auxiliary
Helping and be connected in parallel to phase shift module between the outfan of module, wherein phase shift module 3 has 90 ° of phase shifts, make main power amplifier module 1 with
There is between the two-way of auxiliary power amplifier module 2 parallel connection the phase contrast of 90 °.The outfan of main power amplifier module is compensated by phase shift module
Total output is become with auxiliary power amplifier outfan, the also company of series connection between input and the phase shift module of described auxiliary power amplifier module after synthesizing afterwards
Being connected to ferroelectric capacitor 4, this ferroelectric capacitor connects adjustable Dc bias.
Present invention post-distortion linearization based on ferroelectric capacitor Doherty power amplifier use ferroelectric capacitor structure participate in auxiliary merit
The source traction coupling put, by changing the Dc bias of ferroelectric capacitor, the mode of the dielectric constant changing ferroelectric material adjusts ferroelectricity electricity
The capacitance held, thus realize being adjusted flexibly of auxiliary power amplifier source traction coupling；In high power conditions, by adjusting the appearance of ferroelectric capacitor
Value realizes the gain expansion of auxiliary power amplifier, compensates the gain compression distortion of main power amplifier.
Described main power model, auxiliary power module and phase shift module are layed on medium substrate, and described medium substrate uses Rogers
4350 media, DIELECTRIC CONSTANT εrIt is 2 to 5, loss angle tangent tg σ≤10-3, thickness 0.254mm.Described ferroelectric capacitor uses
Ferroelectricity barium strontium titanate ferroelectric material, dielectric constant 350, thickness 0.01mm.
As in figure 2 it is shown, described ferroelectric capacitor includes having the external-open that the inner opening ring part of upper shed and under shed, opening 8 are downward
Mouth ring part, two interdigital microstrip line unit 11: the i.e. first interdigital microstrip line unit and the second interdigital microstrip line unit, described interior
Open annular portion and outward opening ring part all have lower-left open end 12 and bottom right open end 13, described inner opening ring part
Lower-left open end is connected with the lower-left open end of outward opening ring part, the bottom right open end of described inner opening ring part and external-open
The bottom right open end in degree of lip-rounding portion connects, and the upper shed of described inner opening ring part forms two curved portions 6,7 separated with under shed,
Two curved portions are oppositely arranged, and two curved portions are connected by the first interdigital microstrip line unit being set up in parallel and the second interdigital microstrip line unit
Connecing, the first interdigital microstrip line unit and the second interdigital microstrip line unit connect bias voltage respectively.
As it is shown on figure 3, described first interdigital microstrip line unit includes the first interdigital structure and the second interdigital structure, described first interdigital
Structure and the second interdigital structure all include the first interdigital microstrip line and the second interdigital microstrip line, and described first interdigital microstrip line includes multiple
It is parallel to each other and the first evenly distributed interdigital unit of strip 21, and passes through between multiple the first interdigital unit of strip being parallel to each other
One is connected with the first orthogonal first strip microstrip line 22 of the interdigital unit of strip；Described second interdigital microstrip line includes multiple
It is parallel to each other and the second evenly distributed interdigital unit of strip 211, and passes through between multiple the second interdigital unit of strip being parallel to each other
One is connected with the second orthogonal second strip microstrip line 212 of the interdigital unit of strip；The described first interdigital unit of strip and second
The interdigital unit of strip is staggered two-by-two；The two ends of the second strip microstrip line of described first interdigital microstrip line and the second interdigital microstrip line
The second strip microstrip line two ends connect.
The second described in the present invention interdigital microstrip line unit and the structure of the first interdigital microstrip line unit are identical, the most superfluous
State.
In the present embodiment, the interdigital microstrip transmission line unit in two, left and right (the first interdigital microstrip line unit and the second interdigital microstrip line list
Unit) it is equivalent to variable capacitance.5 is through hole ground connection, a length of l of the interdigital unit of strip, and width is w, and gap is s.Interior annulus
Radius is R1, outer toroid radius is R2, annular width is d.The present invention by adjust the length of the interdigital unit of strip, width,
Spacing between gap and interdigital structure, it is possible to obtain required phase place.
When passband central frequency is about 2.4GHz, medium substrate all uses bst thin film ferroelectric material, dielectric constant 350, thickness
Degree is 0.01mm, direct current supply voltage 150～240 volts of adjustment.The inner parameter initial value of ferroelectric capacitor is determined respectively by emulation,
L=0.15mm, w=0.05mm, s=0.03mm, R1=1.3mm, R2=3.6mm, d=0.8mm.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, it is clear that those skilled in the art is permissible
The present invention is carried out various change and modification without departing from the spirit and scope of the present invention.So, if the present invention these amendment and
Modification belongs within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these changes and modification exists
In.
Claims (6)
1. a post-distortion linearization Doherty power amplifier based on ferroelectric capacitor, it is characterised in that: include the main power amplifier module being connected in parallel
With auxiliary power amplifier module, described main power amplifier module inputs as the total of Doherty power amplifier with the input of auxiliary power amplifier module
End, is connected in series with phase shift module, the outfan of main power amplifier module and auxiliary between input and portion's input of auxiliary power amplifier module
Being connected in parallel to phase shift module between the outfan of module, the outfan of main power amplifier module is defeated with auxiliary power amplifier after being compensated by phase shift module
Become total output after going out end synthesis, between input and the phase shift module of described auxiliary power amplifier module, be also connected in series with ferroelectric capacitor,
This ferroelectric capacitor connects adjustable Dc bias.
Post-distortion linearization Doherty power amplifier based on ferroelectric capacitor the most according to claim 1, it is characterised in that: described ferroelectricity
Electric capacity includes having the inner opening ring part of upper shed and under shed, the outward opening ring part that Open Side Down, the first interdigital microstrip line list
Unit and the second interdigital microstrip line unit, described inner opening ring part and outward opening ring part all have lower-left open end and bottom right opening
End, the lower-left open end of described inner opening ring part is connected with the lower-left open end of outward opening ring part, described inner opening ring
The bottom right open end in shape portion is connected with the bottom right open end in external-open degree of lip-rounding portion, the upper shed of described inner opening ring part and under shed
Forming the curved portions of two separation, two curved portions are oppositely arranged, and two curved portions are by the first interdigital microstrip line unit of being set up in parallel and the
Two interdigital microstrip line unit connect, and the first interdigital microstrip line unit and the second interdigital microstrip line unit connect bias voltage respectively.
Post-distortion linearization Doherty power amplifier based on ferroelectric capacitor the most according to claim 2, it is characterised in that: described first
Interdigital microstrip line unit includes that the first interdigital structure and the second interdigital structure, described first interdigital structure and the second interdigital structure all include
First interdigital microstrip line and the second interdigital microstrip line, described first interdigital microstrip line includes multiple be parallel to each other and evenly distributed first
Between the interdigital unit of strip, and multiple the first interdigital unit of strip being parallel to each other by one the most vertical with the first interdigital unit of strip
The first straight strip microstrip line connects；Described second interdigital microstrip line includes multiple be parallel to each other and the second evenly distributed strip is interdigital
By one and the second interdigital unit of strip orthogonal second between unit, and multiple the second interdigital unit of strip being parallel to each other
Strip microstrip line connects；The described first interdigital unit of strip and the interdigital unit of the second strip are staggered two-by-two；Described first interdigital micro-
The two ends of the second strip microstrip line of band wire are connected with the two ends of the second strip microstrip line of the second interdigital microstrip line.
Post-distortion linearization Doherty power amplifier based on ferroelectric capacitor the most according to claim 3, it is characterised in that: described second
Interdigital microstrip line unit includes that third fork refers to structure and the 4th interdigital structure, and described third fork refers to that structure and the 4th interdigital structure all include
Third fork refers to microstrip line and the 4th interdigital microstrip line, and described third fork refers to that microstrip line includes multiple be parallel to each other and the evenly distributed the 3rd
A unit interdigital with Article 3 shape is passed through the most vertical between the interdigital unit of strip, and multiple interdigital unit of Article 3 shape being parallel to each other
Straight Article 3 shape microstrip line connects；Described 4th interdigital microstrip line includes multiple be parallel to each other and evenly distributed Article 4 shape is interdigital
By one and the interdigital unit of Article 4 shape the orthogonal 4th between unit, and multiple interdigital unit of Article 4 shape being parallel to each other
Strip microstrip line connects；The described interdigital unit of Article 3 shape unit interdigital with Article 4 shape is staggered two-by-two；Described third fork refers to micro-
The two ends of the Article 4 shape microstrip line of band wire are connected with the two ends of the Article 4 shape microstrip line of the 4th interdigital microstrip line.
5. according to the post-distortion linearization Doherty power amplifier based on ferroelectric capacitor described in Claims 1 to 4 any one, it is characterised in that:
Described main power model, auxiliary power module and phase shift module are layed on medium substrate, and described medium substrate uses Rogers 4350
Medium, dielectric constant 3.48, thickness 0.254mm.
6. according to the post-distortion linearization Doherty power amplifier based on ferroelectric capacitor described in Claims 1 to 4 any one, it is characterised in that:
Described ferroelectric capacitor uses ferroelectricity barium strontium titanate ferroelectric material, dielectric constant 350, thickness 0.01mm.
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Cited By (3)
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| CN106656054A (en) * | 2016-10-14 | 2017-05-10 | 重庆邮电大学 | High-linearity Doherty power amplifier based on active non-Forster circuit |
| CN106936394A (en) * | 2017-01-12 | 2017-07-07 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Distortion low-noise amplifier after Larger Dynamic |
| CN111682852A (en) * | 2020-06-23 | 2020-09-18 | 重庆邮电大学 | High-efficiency three-way doherty power amplifier based on power dividing ratio and phase-adjustable bridge |
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| CN111682852A (en) * | 2020-06-23 | 2020-09-18 | 重庆邮电大学 | High-efficiency three-way doherty power amplifier based on power dividing ratio and phase-adjustable bridge |
| CN111682852B (en) * | 2020-06-23 | 2024-01-26 | 重庆嘉旦微电子有限公司 | High-efficiency three-way doherty power amplifier based on power ratio and phase adjustable bridge |
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| CN105915182B (en) | 2018-07-27 |
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Effective date of registration: 20230310 Address after: 400030 b1-804, 8th floor, building B1, R & D building 62-1, Xuecheng Avenue, Xiyong street, high tech Zone, Shapingba District, Chongqing Patentee after: Chongqing Jiadan Microelectronics Co.,Ltd. Address before: 400065 Chongqing Nan'an District huangjuezhen pass Chongwen Road No. 2 Patentee before: CHONGQING University OF POSTS AND TELECOMMUNICATIONS |