CN103973234A - Harmonic inhibition combinational circuit for radio frequency power amplifier - Google Patents
Harmonic inhibition combinational circuit for radio frequency power amplifier Download PDFInfo
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- CN103973234A CN103973234A CN201310039803.3A CN201310039803A CN103973234A CN 103973234 A CN103973234 A CN 103973234A CN 201310039803 A CN201310039803 A CN 201310039803A CN 103973234 A CN103973234 A CN 103973234A
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Abstract
The invention relates to a harmonic inhibition combinational circuit for a radio frequency power amplifier, belongs to the technical field of harmonic inhibition, and particularly relates to the harmonic inhibition combinational circuit for the radio frequency power amplifier. The invention provides the harmonic inhibition combinational circuit for the radio frequency power amplifier, with a good harmonic inhibition effect and a simple structure. The harmonic inhibition combinational circuit comprises a power amplifier and an output matching circuit, wherein the output end of the power amplifier is connected with the input end of the output matching circuit. The harmonic inhibition combinational circuit has the structural key points of further comprising an even-order harmonic inhibition transmission line and a three-order harmonic inhibition transmission line, wherein the even-order harmonic inhibition transmission line is connected with the input end or the output end of the output matching circuit, and the three-order harmonic inhibition transmission line is connected with the input end or the output end of the output matching circuit.
Description
Technical field
The invention belongs to harmonic wave and suppress technical field, relate in particular to a kind of radio-frequency power amplifier harmonic wave and suppress combinational circuit.
Background technology
Along with the develop rapidly of wireless communication technology, the linear properties of wireless transceiver is required progressively to improve.Radio-frequency power amplifier, as the afterbody in transmitter, has affected the linear properties of whole transceiver to a great extent.Conventionally, the afterbody of radio-frequency power amplifier adopts AB power-like amplifier, due to the impact of nonlinear distortion, in the time that signal is increased to a certain degree, radio-frequency power amplifier produces series of harmonic because being operated in inelastic region, affect to a great extent the linear properties of radio-frequency power amplifier, become so suppress harmonic wave the important measures that improve linearity of radio-frequency power amplifier.
Summary of the invention
The present invention is exactly for the problems referred to above, provides the radio-frequency power amplifier harmonic wave that a kind of harmonic suppression effect is good and simple in structure to suppress combinational circuit.
For achieving the above object, the present invention adopts following technical scheme, the present invention includes power amplifier, output matching circuit, the output of power amplifier is connected with the input of output matching circuit, its structural feature also comprises that even-order harmonic suppresses transmission line and triple-frequency harmonics suppresses transmission line, even-order harmonic suppresses transmission line and is connected with input or the output of output matching circuit, and triple-frequency harmonics suppresses transmission line and is connected with input or the output of output matching circuit.
As a kind of preferred version, it is short circuit λ/4 transmission lines that even-order harmonic of the present invention suppresses transmission line, and λ is fundamental wavelength.
As another kind of preferred version, triple-frequency harmonics of the present invention suppresses transmission line for open circuit λ/12 transmission line or short circuit λ/6 transmission line, and λ is fundamental wavelength.
Secondly, short circuit of the present invention λ/4 transmission line is connected with the input of output matching circuit, and open circuit λ/12 transmission line is connected with the output of output matching circuit.
In addition, transmission line of the present invention is microstrip transmission line.
Beneficial effect of the present invention:
Even-order harmonic of the present invention suppresses transmission line and is connected with input or the output of output matching circuit, and triple-frequency harmonics suppresses transmission line and is connected with input or the output of output matching circuit; The harmonic wave of having realized producing in working band absorbs effectively.Test result shows: the present invention all has good absorption to secondary, four inferior even-order harmonics and triple-frequency harmonics, increases substantially the linearity of amplifier circuit.
Brief description of the drawings
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.Protection range of the present invention is not only confined to the statement of following content.
Fig. 1 is schematic block circuit diagram of the present invention.
In Fig. 2 the present invention, even-order harmonic suppresses transmission line and triple-frequency harmonics inhibition transmission line on-position schematic diagram.
Fig. 3 is using short circuit λ/4 transmission line and the simulation in the frequency-domain result figure of λ/12 transmission line as harmonic wave inhibition transmission line that open a way in the present invention.
Fig. 4 is using short circuit λ/4 transmission line and the test result figure of λ/12 transmission line as harmonic wave inhibition transmission line that open a way in the present invention.
Fig. 5 does not connect the radio-frequency power amplifier power output change curve that even-order harmonic suppresses transmission line and triple-frequency harmonics inhibition transmission line.
Fig. 6 uses short circuit of the present invention λ/4 transmission line and open circuit λ/12 transmission line to suppress the radio-frequency power amplifier power output change curve of transmission line as harmonic wave.
Embodiment
As shown in Figure 1, the present invention includes power amplifier, output matching circuit, the output of power amplifier is connected with the input of output matching circuit, its structural feature also comprises that even-order harmonic suppresses transmission line and triple-frequency harmonics suppresses transmission line, even-order harmonic suppresses transmission line and is connected with input or the output of output matching circuit, and triple-frequency harmonics suppresses transmission line and is connected with input or the output of output matching circuit.As shown in Figure 2, the on-position of even-order harmonic inhibition transmission line and triple-frequency harmonics inhibition transmission line can be optional in position 1～4.
It is short circuit λ/4 transmission lines that described even-order harmonic suppresses transmission line, and λ is fundamental wavelength.Short circuit λ/4 transmission line is that length is the short-circuited transmission line of N × λ '/4, the number of times that wherein N is harmonic wave, and λ ' is the corresponding wavelength of N subharmonic.For the even-order harmonic such as second harmonic, four-time harmonic, this short-circuited transmission line is the integral multiple of even-order harmonic corresponding wavelength λ '/2, inhibited to even-order harmonic.
Described triple-frequency harmonics suppresses transmission line for open circuit λ/12 transmission line or short circuit λ/6 transmission line, and λ is fundamental wavelength.In the time suppressing transmission line with open circuit λ/12 transmission line as triple-frequency harmonics, λ/12 transmission line is that length is that λ "/4, λ " is the corresponding wavelength of triple-frequency harmonics, and "/4 lines have good inhibitory action to triple-frequency harmonics to open circuit λ just; When with short circuit λ/6 transmission lines during as three humorous inhibition transmission lines, λ/6 transmission line is that length is λ, and "/2, "/2 lines have good inhibitory action to triple-frequency harmonics to short circuit λ just.
Described short circuit λ/4 transmission line is connected with the input of output matching circuit, and open circuit λ/12 transmission line is connected with the output of output matching circuit.
Described transmission line is microstrip transmission line.
In the present invention, circuit can be made on Rogers4350B type pcb board.Plate thickness is 0.508mm, and corresponding 50 ohm microstrip line widths are about 1.07mm, according to the formula of effective dielectric constant
relation with velocity of wave and wavelength
can obtain fundamental wavelength λ.
As shown in Figure 3, taking working frequency points 2.4GHz as example, can find out that this harmonic suppression circuit has good absorption to 4.8GHz (second harmonic) and 7.2GHz (triple-frequency harmonics) frequency, also has obvious inhibitory action for 9.6GHz (four-time harmonic).And for first-harmonic, the impact of this harmonic suppression circuit is very little, 0.3dB has only decayed.
As shown in Figure 4, can find out that the simulation result of itself and Fig. 3 is comparatively approaching, verify the accuracy of this harmonic suppression circuit.
As shown in Figure 5, the value during taking input power as-10dBm is as example, the power output of first-harmonic, second harmonic, triple-frequency harmonics and four-time harmonic be respectively 31.2dBm ,-4.8dBm ,-14.6dBm and-24.7dBm.
As shown in Figure 6, equally taking input power as-10dBm is as example, the power output of first-harmonic, second harmonic, triple-frequency harmonics and four-time harmonic be respectively 30.8dBm ,-21.7dBm ,-48dBm and-25.5dBm.Compared with Fig. 5, can find out that this harmonic suppression circuit has comparatively significantly absorption to second harmonic and triple-frequency harmonics, also has inhibitory action to four-time harmonic.
Be understandable that, above about specific descriptions of the present invention, only for being described, the present invention is not limited to the described technical scheme of the embodiment of the present invention, those of ordinary skill in the art is to be understood that, still can modify or be equal to replacement the present invention, to reach identical technique effect; Use needs as long as meet, all within protection scope of the present invention.
Claims (5)
1. a radio-frequency power amplifier harmonic wave suppresses combinational circuit, comprise power amplifier, output matching circuit, the output of power amplifier is connected with the input of output matching circuit, characterized by further comprising even-order harmonic and suppress transmission line and triple-frequency harmonics inhibition transmission line, even-order harmonic suppresses transmission line and is connected with input or the output of output matching circuit, and triple-frequency harmonics suppresses transmission line and is connected with input or the output of output matching circuit.
2. a kind of radio-frequency power amplifier harmonic wave suppresses combinational circuit according to claim 1, it is characterized in that it is short circuit λ/4 transmission lines that described even-order harmonic suppresses transmission line, and λ is fundamental wavelength.
3. a kind of radio-frequency power amplifier harmonic wave suppresses combinational circuit according to claim 2, it is characterized in that described triple-frequency harmonics suppresses transmission line for open circuit λ/12 transmission line or short circuit λ/6 transmission line.
4. a kind of radio-frequency power amplifier harmonic wave suppresses combinational circuit according to claim 3, it is characterized in that described short circuit λ/4 transmission line is connected with the input of output matching circuit, and open circuit λ/12 transmission line is connected with the output of output matching circuit.
5. a kind of radio-frequency power amplifier harmonic wave suppresses combinational circuit according to claim 1, it is characterized in that described transmission line is microstrip transmission line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310039803.3A CN103973234A (en) | 2013-01-31 | 2013-01-31 | Harmonic inhibition combinational circuit for radio frequency power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310039803.3A CN103973234A (en) | 2013-01-31 | 2013-01-31 | Harmonic inhibition combinational circuit for radio frequency power amplifier |
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| Publication Number | Publication Date |
|---|---|
| CN103973234A true CN103973234A (en) | 2014-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310039803.3A Pending CN103973234A (en) | 2013-01-31 | 2013-01-31 | Harmonic inhibition combinational circuit for radio frequency power amplifier |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104579189A (en) * | 2015-02-04 | 2015-04-29 | 广东工业大学 | Circuit structure for improving harmonic performance of radio frequency power amplifier |
| CN104716906A (en) * | 2015-04-03 | 2015-06-17 | 广东工业大学 | Method and circuit structure for improving efficiency of wide-band radio frequency power amplifier |
| CN107425814A (en) * | 2017-08-07 | 2017-12-01 | 杭州电子科技大学 | A kind of broadband Doherty power amplifier based on compensation parasitic capacitance |
| CN107508560A (en) * | 2017-08-11 | 2017-12-22 | 杭州电子科技大学 | A kind of Doherty power amplifier and its implementation for strengthening bandwidth performance |
| WO2019051660A1 (en) * | 2017-09-13 | 2019-03-21 | 北京泰龙电子技术有限公司 | Radio-frequency power supply for improving efficiency of radio-frequency power amplifier |
-
2013
- 2013-01-31 CN CN201310039803.3A patent/CN103973234A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104579189A (en) * | 2015-02-04 | 2015-04-29 | 广东工业大学 | Circuit structure for improving harmonic performance of radio frequency power amplifier |
| CN104716906A (en) * | 2015-04-03 | 2015-06-17 | 广东工业大学 | Method and circuit structure for improving efficiency of wide-band radio frequency power amplifier |
| CN107425814A (en) * | 2017-08-07 | 2017-12-01 | 杭州电子科技大学 | A kind of broadband Doherty power amplifier based on compensation parasitic capacitance |
| CN107508560A (en) * | 2017-08-11 | 2017-12-22 | 杭州电子科技大学 | A kind of Doherty power amplifier and its implementation for strengthening bandwidth performance |
| WO2019051660A1 (en) * | 2017-09-13 | 2019-03-21 | 北京泰龙电子技术有限公司 | Radio-frequency power supply for improving efficiency of radio-frequency power amplifier |
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| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140806 |