CN203445841U - Power amplifier circuit capable of improving linearity - Google Patents
Power amplifier circuit capable of improving linearity Download PDFInfo
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- CN203445841U CN203445841U CN201320561426.5U CN201320561426U CN203445841U CN 203445841 U CN203445841 U CN 203445841U CN 201320561426 U CN201320561426 U CN 201320561426U CN 203445841 U CN203445841 U CN 203445841U
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- power amplifier
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- amplifier circuit
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Abstract
The utility model provides a power amplifier circuit capable of improving linearity, and belongs to the technical field of communication. The power amplifier circuit can be used for adjusting the linearity of a power amplifier chip circuit under the DC bias, and comprises a power amplifier, a power detector, a switch tube, a choke inductor, a diode, a resistor, a biasing circuit and a blocking condenser. The output port of the biasing circuit is connected with the biasing voltage input port of the power amplifier. The power amplifier circuit is characterized in that the input end of the power detector is connected with one end of the blocking condenser, the output end of the power detector is connected with the input end of the switch tube, the output end of the switch tube is connected with one end of the choke inductor, the other end of the choke inductor is connected with the other end of the condenser, the anode of the diode and the input end of the power amplifier respectively, and the cathode of the diode is connected with the ground through the resistor.
Description
Technical field
the utility model belongs to communication technical field, relates in particular to a kind of power amplifier circuit that improves the linearity.
Background technology
the problem of the high peak-to-average force ratio that the multi-transceiver technology in Modern wireless communication is brought, makes the designers of transmitting set be faced with the challenge of continuous appearance, no matter, from the still use to wireless frequency spectrum of power management, all needs to build system more efficiently.Concerning power amplifier, to meet the requirement of height power ratio (PAPR) the signal linearity on the one hand, power amplifier itself need to be operated in back-off state (from the power of 1dB compression point rollback PAPR size), and power amplifier just can not be operated in maximum efficient state like this.On the other hand, in order to reduce power consumption, to raise the efficiency, need to, by power amplifier bias at lower DC point, still, when raising the efficiency, often bring comparatively serious distortion.Increase along with power, its non-linear meeting significantly increases, when the modulation signal with certain bandwidth is by after power amplifier, except inband distortion, also can produce intermodulation component, cause spread spectrum, neighboring trace signal formation is disturbed, directly have influence on the error rate of receiving system, worsen the performance of communication system.
in order to realize indexs such as meeting the needed gain of system and power, power amplifier often needs multi-stage cascade, considers linearizing design, and prime is because power consumption is lower, generally be biased in category-A operating state, and rear class (afterwards what) is often partial to the even dark AB class of AB class.Increasing along with input signal, power amplifier is except there will be gain compression, because bias current is lower, toward contact, there will be one section of gain expansion area, generally in high power region, the gain expansion of appropriateness can make up gain compression, makes to prolong after the 1dB compression point of power amplifier, thereby improves the linearity; But for non-constant enveloped modulation system, high peak-to-average force ratio brings higher linearity, amplitude and phase distortion that gain expansion is introduced are often very important.
as shown in Figure 1, while not using the utility model, the power gain curve of power amplifier increases with input signal, and the region that there will be one section of gain to skyrocket is called gain swelling, just in time contrary with the gain compression of power amplifier.The reason that this phenomenon occurs is, power amplifier reduces power consumption for obtaining higher power added efficiency, often rear class bias current is lower, in such cases, the maximum stable gain of radio frequency power tube (MSG) has the process of a sudden change, corresponding to power gain curve, be to occur one section of gain expansion area.It is favourable that suitable gain is expanded to making up the gain compression raising linearity, but cause gain to be expanded when comparatively serious when bias point is too low, can make amplitude and phase distortion more obvious, especially phase distortion, this is concerning using the power amplifier under modulation signal, can worsen its inband distortion and out-of-band distortion, bring deterioration and the spectral re-growth of Error Vector Magnitude (EVM).This can monitor when using signal source and frequency spectrograph measured power amplifier chip performance.
Summary of the invention
the utility model is exactly for the problems referred to above, and a kind of power amplifier circuit of the linearity improved that can regulate the linearity of the power amplifier chip circuit under low direct current biasing is provided.
for achieving the above object, the utility model adopts following technical scheme, the utility model comprises power amplifier, power detector, switching tube, choke induction, diode, resistance, biasing circuit and capacitance, and biasing circuit output port is connected with the bias voltage input port of power amplifier; The input of its structural feature power detector is connected with capacitance one end, the output of power detector is connected with switching tube input, switching tube output is connected with choke induction one end, the choke induction other end is connected with the electric capacity other end, diode anode, power amplifier input respectively, and diode cathode passes through grounding through resistance.
as a kind of preferred version, switching tube described in the utility model adopts MOSFET.
as another kind of preferred version, resistance described in the utility model adopts adjustable resistance.
in addition, choke induction described in the utility model adopts chip inductor.
the utility model beneficial effect.
the utility model is by introducing a negative gain branch road (diode branch road in series with a resistor), the gain of having subdued middle high power region is expanded, improve the linearity of power amplifier, realized the adjusting to the power amplifier chip circuit linearity under low direct current biasing.In addition, the utility model choke induction can stop pouring into of radiofrequency signal, and capacitance can stop the impact of power detection voltage on rf inputs; So the utility model working stability, reliable.
Accompanying drawing explanation
below in conjunction with the drawings and specific embodiments, the utility model is described further.The utility model protection range is not only confined to the statement of following content.
fig. 1 is the power gain curve of power amplifier circuit while not using the utility model.
fig. 2 is a kind of circuit structure of the utility model embodiment.
fig. 3 is the power gain curve of power amplifier circuit after use the utility model.
fig. 4 is the another kind of circuit structure of the utility model embodiment.
Embodiment
as shown in Figure 2, the utility model comprises power amplifier 201, power detector 202, switching tube 203, choke induction 204, diode 205, resistance 206, biasing circuit 207 and capacitance 208, and biasing circuit 207 output ports are connected with the bias voltage input port of power amplifier 201; The input of power detector 202 is connected with capacitance 208 one end, the output of power detector 202 is connected with switching tube 203 inputs, switching tube 203 outputs are connected with choke induction 204 one end, choke induction 204 other ends are connected with the electric capacity other end, diode 205 anodes, power amplifier 201 inputs respectively, and diode 205 negative electrodes are by resistance 206 ground connection.
described switching tube 203 adopts MOSFET.
as shown in Figure 4, described resistance 206 adopts adjustable resistance.Adjustable resistance jointly regulates the impedance of this parallel branch together with diode 205, has improved flexibility ratio; And can determine by monitoring tester the size of this resistance 206.
described choke induction 204 adopts chip inductor.Chip inductor is arranged on outside sheet, has reduced chip area.
as shown in Figure 3, although that the utility model entire gain has is unsteady slightly, the negative gain that the parallel branch forming due to diode 205 and resistance 206 is brought, has improved the gain swelling of power amplifier 201.
below in conjunction with accompanying drawing explanation the utility model setting and the course of work.
first switch mosfet, in off-state, carries out power scan to input signal, draws the gain curve of this power amplifier 201, and finds the initial input power point that occurs that gain is expanded.Then input signal is fixed as to above-mentioned input power, the detection voltage of regulating power detector 202, makes magnitude of voltage a little less than the cut-in voltage of diode 205.Finally switch mosfet is set to closure state.Thus, when input signal power increases, power detection voltage increases, increase along with radio-frequency input signals, diode 205 declines with its motional impedance of increase of rectified current, make to flow into the radiofrequency signal increased power of this parallel branch, subdued input signal compared with gain swelling large and that occur in the lower situation of direct current biasing, improved the linearity.
be understandable that, above about specific descriptions of the present utility model, only for being described, the utility model is not limited to the described technical scheme of the utility model embodiment, those of ordinary skill in the art is to be understood that, still can modify or be equal to replacement the utility model, to reach identical technique effect; As long as meet, use needs, all within protection range of the present utility model.
Claims (4)
1. the power amplifier circuit that can improve the linearity, comprise power amplifier (201), power detector (202), switching tube (203), choke induction (204), diode (205), resistance (206), biasing circuit (207) and capacitance (208), biasing circuit (207) output port is connected with the bias voltage input port of power amplifier (201); The input that it is characterized in that power detector (202) is connected with capacitance (208) one end, the output of power detector (202) is connected with switching tube (203) input, switching tube (203) output is connected with choke induction (204) one end, choke induction (204) other end is connected with the electric capacity other end, diode (205) anode, power amplifier (201) input respectively, and diode (205) negative electrode is by resistance (206) ground connection.
2. a kind of power amplifier circuit that improves the linearity according to claim 1, is characterized in that described switching tube (203) adopts MOSFET.
3. a kind of power amplifier circuit that improves the linearity according to claim 1, is characterized in that described resistance (206) adopts adjustable resistance.
4. a kind of power amplifier circuit that improves the linearity according to claim 1, is characterized in that described choke induction (204) adopts chip inductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320561426.5U CN203445841U (en) | 2013-09-11 | 2013-09-11 | Power amplifier circuit capable of improving linearity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320561426.5U CN203445841U (en) | 2013-09-11 | 2013-09-11 | Power amplifier circuit capable of improving linearity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203445841U true CN203445841U (en) | 2014-02-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320561426.5U Expired - Fee Related CN203445841U (en) | 2013-09-11 | 2013-09-11 | Power amplifier circuit capable of improving linearity |
Country Status (1)
| Country | Link |
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| CN (1) | CN203445841U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107493083A (en) * | 2016-06-13 | 2017-12-19 | 中国科学院微电子研究所 | A kind of RF power amplifier circuit with standing wave automatic protection functions |
| CN107911086A (en) * | 2017-12-25 | 2018-04-13 | 牛旭 | The radio-frequency power amplifier and radio frequency communication terminal of a kind of high linearity |
| CN109274371A (en) * | 2018-08-27 | 2019-01-25 | 上海奥令科电子科技有限公司 | A kind of high speed high linearity driving/buffer circuit |
| CN111064438A (en) * | 2019-12-25 | 2020-04-24 | 北京普能微电子科技有限公司 | Analog predistortion circuit, power amplifier and radio frequency module |
-
2013
- 2013-09-11 CN CN201320561426.5U patent/CN203445841U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107493083A (en) * | 2016-06-13 | 2017-12-19 | 中国科学院微电子研究所 | A kind of RF power amplifier circuit with standing wave automatic protection functions |
| CN107911086A (en) * | 2017-12-25 | 2018-04-13 | 牛旭 | The radio-frequency power amplifier and radio frequency communication terminal of a kind of high linearity |
| CN107911086B (en) * | 2017-12-25 | 2024-05-03 | 牛旭 | High-linearity radio frequency power amplifier and radio frequency communication terminal |
| CN109274371A (en) * | 2018-08-27 | 2019-01-25 | 上海奥令科电子科技有限公司 | A kind of high speed high linearity driving/buffer circuit |
| CN109274371B (en) * | 2018-08-27 | 2019-07-30 | 上海奥令科电子科技有限公司 | A kind of high speed high linearity driving/buffer circuit |
| CN111064438A (en) * | 2019-12-25 | 2020-04-24 | 北京普能微电子科技有限公司 | Analog predistortion circuit, power amplifier and radio frequency module |
| CN111064438B (en) * | 2019-12-25 | 2023-12-08 | 北京普能微电子科技有限公司 | Analog predistortion circuit, power amplifier and radio frequency module |
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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: 20140219 Termination date: 20150911 |
|
| EXPY | Termination of patent right or utility model |