CN203039643U - Four-stage double-balanced power amplifier - Google Patents
Four-stage double-balanced power amplifier Download PDFInfo
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- CN203039643U CN203039643U CN 201220743648 CN201220743648U CN203039643U CN 203039643 U CN203039643 U CN 203039643U CN 201220743648 CN201220743648 CN 201220743648 CN 201220743648 U CN201220743648 U CN 201220743648U CN 203039643 U CN203039643 U CN 203039643U
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- power amplifier
- power
- transformation circuit
- output
- inverter circuit
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Abstract
The utility model relates to the technical field of power amplifier design, in particular to a four-stage double-balanced power amplifier. The power amplifier is of a four-stage structure, a power amplification input end is connected with a first power divider, and two ways of output of the first power divider are connected with input ends of a second power divider and a third power divider respectively. One way of output of the second power divider is serially connected with a 90-degree phase transformation circuit, a master power amplifier and an impedance transformation circuit Z01 in sequence, the other way is serially connected with a first slave power amplifier, an impedance transformation circuit Z02 and an impedance transformation circuit Z03 in sequence, and then the two ways are converged to be connected to a power amplification output end via an impedance transformation circuit Z0. One way of output of the third power divider is sequentially serially connected with another 90-degree phase transformation circuit and a second slave power amplifier and then connected between the impedance transformation circuit Z02 and the impedance transformation circuit Z03, and the other way is sequentially serially connected with a 180-degree phase transformation circuit and a third slave power amplifier and then connected to the front of the impedance transformation circuit Z0 to be connected to the power amplification output end via the impedance transformation circuit Z0. The power amplifier is beneficial to improvement of power amplification efficiency.
Description
Technical field
The utility model relates to the Designing power amplifier technical field, particularly a kind of quadravalence double-balance power amplifier.
Background technology
In recent years, social informatization, transmission networkization, contents diversification, terminal mobile, the business-like continuous development of operation have promoted quick replacement and the development of high-speed mobile communication system and wideband multimedia broadcast system.Along with the continuous increase of wireless signal transmission bandwidth, the frequency selective fading that wireless channel is intrinsic and arrowband disturb becomes the principal element that influences the wireless transmission effect.
In the system that adopts the OFDM modulation system, its PAPR is higher than other mobile communication system (probability that PAPR surpasses 12dB can reach 1%) at present, and present comparatively ripe second order and the peak efficiencies scope of three rank Doherty power amplifiers only are respectively 6dB and 9dB, can not meet the demands.
Tradition second order Doherty power amplifier structure, as shown in Figure 1.Tradition Doherty power amplifier structure is made up of 2 power amplifiers: a main power amplifier, and an auxiliary power amplifier, main power amplifier are operated in category-B or AB class, and auxiliary power amplifier is operated in the C class.Two power amplifiers do not take turns to operate, but main power amplifier works always, and auxiliary power amplifier is just worked (this power amplifier also is called peak amplifier) to the peak value of setting.90 ° of quatrter-wavelength lines of main power amplifier back are the impedance conversion, purpose is when auxiliary power amplifier is worked, play the effect that the apparent impedance with main power amplifier reduces, when guaranteeing auxiliary power amplifier work and the active load impedance step-down formed of the circuit of back, it is big that main like this power amplifier output current just becomes.Because there has been quatrter-wavelength line main power amplifier back, in order to make two power amplifier output homophases, also need 90 ° of phase shifts in the auxiliary power amplifier front.
Three road traditional Doherty circuit as shown in Figure 2, this circuit has 3 efficiency peak points in certain power rollback scope in theory, but the problem of its existence is: when power output reaches certain level, the load-modulate action interrupts of main power amplifier and be in degree of depth saturation condition, thus serious linear problem caused.Simultaneously, when selected device power ratio was 1:1:1, the position that first efficiency peak point occurs was the same with two-way symmetry Doherty, and when rollback 6dB place, this structure can not be widened high efficiency scope, just further improves efficient in the scope of rollback 6dB.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of quadravalence double-balance power amplifier is provided, and this power amplifier is conducive to improve power amplification efficiency.
For achieving the above object, the technical solution of the utility model is: a kind of quadravalence double-balance power amplifier, described power amplifier is the quadravalence structure, the power amplifier input is connected with the input of first power splitter, the output one tunnel of described first power splitter is connected to the input of second power splitter, and another road is connected to the input of the 3rd power splitter;
The output one tunnel of described second power splitter is connected in series 90 ° of phse conversion circuit, main power amplifier and impedance inverter circuit Z successively
01, another road is connected in series first successively from power amplifier, impedance inverter circuit Z
02With impedance inverter circuit Z
03, then two-way converges, through impedance inverter circuit Z
0Be connected to the power amplifier output;
The output one tunnel of described the 3rd power splitter is connected in series another 90 ° of phse conversion circuit and second successively from power amplifier, then is connected to described impedance inverter circuit Z
02With impedance inverter circuit Z
03Between; Another road of the output of described the 3rd power splitter is connected in series 180 ° of phse conversion circuit and the 3rd successively from power amplifier, then is connected to described impedance inverter circuit Z
0Before, with through described impedance inverter circuit Z
0Be connected to the power amplifier output.
Compared to prior art, the beneficial effects of the utility model are:
1, can design with the 3dB electric bridge of 3 90 degree at input, dwindle circuit area;
2, further raise the efficiency, can be when back-off 12dB, efficient at first reaches peak value, and 4 efficiency peak points are arranged, no matter in low-power during still at high power, compares with three the tunnel, can both further raise the efficiency;
3, present high-power pipe all is to tubular construction usually, therefore is inconvenient to design with three line structures, and adopts four line structures, just can conveniently design pipe with two.
The utility model is described in further detail below in conjunction with drawings and the specific embodiments.
Description of drawings
Fig. 1 is second order Doherty power amplifier structure chart in the prior art.
Fig. 2 is three road Doherty power amplifier structure charts in the prior art.
Fig. 3 is the circuit structure diagram of the utility model embodiment.
Fig. 4 is the utility model embodiment efficient and power output graph of a relation.
Embodiment
The utility model quadravalence double-balance power amplifier, as shown in Figure 3, described power amplifier is the quadravalence structure, the power amplifier input is connected with the input of first power splitter, the output one tunnel of described first power splitter is connected to the input of second power splitter, and another road is connected to the input of the 3rd power splitter;
The output one tunnel of described second power splitter is connected in series 90 ° of phse conversion circuit, main power amplifier and impedance inverter circuit Z successively
01, another road is connected in series first successively from power amplifier, impedance inverter circuit Z
02With impedance inverter circuit Z
03, then two-way converges, through impedance inverter circuit Z
0Be connected to the power amplifier output;
The output one tunnel of described the 3rd power splitter is connected in series another 90 ° of phse conversion circuit and second successively from power amplifier, then is connected to described impedance inverter circuit Z
02With impedance inverter circuit Z
03Between; Another road of the output of described the 3rd power splitter is connected in series 180 ° of phse conversion circuit and the 3rd successively from power amplifier, then is connected to described impedance inverter circuit Z
0Before, with through described impedance inverter circuit Z
0Be connected to the power amplifier output.
Operation principle to the utility model quadravalence double-balance power amplifier is further described below.
At first the symbol that can occur in the following analysis is described:
,
,
,
: main power amplifier, from power amplifier 1, from power amplifier 2, from the operating voltage of power amplifier 3
: the saturation voltage of power amplifier
: each section
The characteristic impedance of transformation line
: main power amplifier power (
) and gross power (
) ratio
1, during peak power
Have
,
,
,
If
In like manner,
If
Be main power amplifier power (
) and gross power (
) ratio, then have
So
, got by (1)
In like manner can get,
,
Wherein
For peak value power amplifier 1 power (
) with peak value power amplifier 1 and peak value power amplifier 2 power and (
+
) the ratio,
For peak value power amplifier 1 and peak value power amplifier 2 power and power (
+
) and peak value power amplifier 1, peak value power amplifier 2 power and peak value power amplifier 3 sums (
+
+
) the ratio.
Again
2, low-power is when having only main power amplifier to work
Suppose that transmission line does not have consumption, is had by power conservation
Again
Calculate with the category-B power amplifier,
When
The time, main power amplifier reaches voltage saturation, at this moment
3, main power amplifier voltage is saturated, when auxiliary power amplifier 1 is opened
Have
When
The time, peak value power amplifier 1 also reaches voltage saturation, at this moment
4, main power amplifier and auxiliary power amplifier 1 voltage saturation are when auxiliary power amplifier 2 is opened
Have
When
The time, peak value power amplifier 2 also reaches voltage saturation, namely
At this moment
5, main power amplifier and auxiliary power amplifier 1,2 voltage saturations are when auxiliary power amplifier 3 is opened
Have
To sum up, the efficient of four road Doherty is:
The utility model efficient and power output relation are as shown in Figure 4.
More than be preferred embodiment of the present utility model, all changes of doing according to technical solutions of the utility model when the function that produces does not exceed the scope of technical solutions of the utility model, all belong to protection range of the present utility model.
Claims (1)
1. quadravalence double-balance power amplifier, it is characterized in that: described power amplifier is the quadravalence structure, the power amplifier input is connected with the input of first power splitter, the output one tunnel of described first power splitter is connected to the input of second power splitter, and another road is connected to the input of the 3rd power splitter;
The output one tunnel of described second power splitter is connected in series 90 ° of phse conversion circuit, main power amplifier and impedance inverter circuit Z successively
01, another road is connected in series first successively from power amplifier, impedance inverter circuit Z
02With impedance inverter circuit Z
03, then two-way converges, through impedance inverter circuit Z
0Be connected to the power amplifier output;
The output one tunnel of described the 3rd power splitter is connected in series another 90 ° of phse conversion circuit and second successively from power amplifier, then is connected to described impedance inverter circuit Z
02With impedance inverter circuit Z
03Between; Another road of the output of described the 3rd power splitter is connected in series 180 ° of phse conversion circuit and the 3rd successively from power amplifier, then is connected to described impedance inverter circuit Z
0Before, with through described impedance inverter circuit Z
0Be connected to the power amplifier output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220743648 CN203039643U (en) | 2012-12-29 | 2012-12-29 | Four-stage double-balanced power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220743648 CN203039643U (en) | 2012-12-29 | 2012-12-29 | Four-stage double-balanced power amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203039643U true CN203039643U (en) | 2013-07-03 |
Family
ID=48691728
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220743648 Expired - Fee Related CN203039643U (en) | 2012-12-29 | 2012-12-29 | Four-stage double-balanced power amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203039643U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109660214A (en) * | 2018-12-20 | 2019-04-19 | 佛山臻智微芯科技有限公司 | One kind being applied to the 5th third-generation mobile communication base station Doherty power amplifier |
-
2012
- 2012-12-29 CN CN 201220743648 patent/CN203039643U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109660214A (en) * | 2018-12-20 | 2019-04-19 | 佛山臻智微芯科技有限公司 | One kind being applied to the 5th third-generation mobile communication base station Doherty power amplifier |
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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 |
Granted publication date: 20130703 Termination date: 20151229 |
|
| EXPY | Termination of patent right or utility model |