CN110995171A - Doherty power amplifier module system and bias circuit thereof - Google Patents
Doherty power amplifier module system and bias circuit thereof Download PDFInfo
- Publication number
- CN110995171A CN110995171A CN201911282719.8A CN201911282719A CN110995171A CN 110995171 A CN110995171 A CN 110995171A CN 201911282719 A CN201911282719 A CN 201911282719A CN 110995171 A CN110995171 A CN 110995171A
- Authority
- CN
- China
- Prior art keywords
- power amplifier
- doherty power
- circuit
- bias
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Images
Classifications
-
- 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
- H03F1/04—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers
- H03F1/06—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers to raise the efficiency of amplifying modulated radio frequency waves; to raise the efficiency of amplifiers acting also as modulators
- H03F1/07—Doherty-type amplifiers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a Doherty power amplifier module system and a bias circuit thereof, wherein the bias circuit is integrated in the Doherty power amplifier module system and comprises a temperature detection module, a bias information storage module, a control circuit, a Doherty power amplifier and a DAC circuit, in the Doherty power amplifier with the slope and the bias voltage at normal temperature written, the control circuit actively inquires the temperature detection module at the working interval of the Doherty power amplifier, then searches and interpolates the required bias voltage in the bias information storage module according to the temperature signal fed back by the temperature detection module, and then controls the DAC circuit to output the proper bias voltage to the Doherty amplifier. The invention realizes the miniaturization of the Doherty power amplifier and simultaneously carries out temperature compensation on the bias voltage of the main circuit and the auxiliary circuit, so that the generated AMAM curve can not be distorted along with the temperature change.
Description
Technical Field
The invention belongs to the technical field of Doherty radio-frequency power amplifiers, and particularly relates to a Doherty power amplifier module system and a bias circuit thereof.
Background
For a Doherty power amplifier module, generally, curves of bias voltages of a main circuit and a secondary circuit of the Doherty power amplifier module, which change with temperature, are different, and curves required by each power amplifier tube are also different due to the radio frequency power tube process.
In the prior art, the gates of the main and auxiliary circuits of the power amplifier module are used as external connection legs, and a DAC (digital-to-analog converter) in the external main control module is required to provide a proper voltage. In this way, the customer needs to set a proper voltage and needs to be connected with a high-precision resistor externally to test the quiescent current of the power amplifier. With the trend of miniaturization of power amplifier modules, suppliers of base station equipment want to integrate all the above functions into the power amplifier modules.
Therefore, it is necessary to research a new Doherty power amplifier module, which can compensate the temperature of the bias voltages of the main and auxiliary circuits while realizing the miniaturization of the power amplifier module, so that the generated AMAM curve is not distorted with the temperature change.
Disclosure of Invention
In view of the above, the present invention is directed to a Doherty power amplifier module system and a bias circuit thereof.
In order to achieve the above object, an embodiment of the present invention provides the following technical solutions:
a bias circuit of a Doherty power amplifier module system, wherein the bias circuit is integrated in the Doherty power amplifier module system, and the bias circuit comprises:
the bias circuit includes:
the power of the Doherty power amplifier is amplified,
the temperature detection module is used for measuring the ambient temperature of the Doherty power amplifier;
the bias information storage module is used for storing the slope of the bias voltage along with the change of the temperature and the bias voltage at normal temperature;
the control circuit is connected with the temperature detection module and the bias information storage module and is used for actively inquiring the temperature detection module at the working interval of the Doherty power amplifier, searching out corresponding bias voltage in the bias information storage module according to a temperature signal fed back by the temperature detection module and outputting the bias voltage to the DAC circuit;
and the input end of the DAC circuit is connected with the control circuit, and the output end of the DAC circuit is connected with the Doherty power amplifier and used for converting the digital signal transmitted by the control circuit into a bias voltage signal for controlling the Doherty power amplifier.
In an embodiment, the circuit further includes a digital interface circuit connected to the control circuit, and configured to set a bias voltage of the Doherty power amplifiers in a debugging process of the Doherty power amplifiers, or to set a bias voltage and a slope required when each Doherty power amplifier reaches a preset quiescent current in a calibration process of the Doherty power amplifiers.
In one embodiment, the offset information storage module stores the slope by using a table look-up method or an interpolation circuit.
In one embodiment, the bias information storage module is an EEPROM memory.
In an embodiment, the slope is determined during the debugging of the Doherty power amplifier.
In one embodiment, the determining of the slope includes:
s1, debugging the Doherty power amplifier at normal temperature to ensure that the Doherty power amplifier passes through DPD performance at normal temperature and determines the bias voltage of the main circuit and the auxiliary circuit of the Doherty power amplifier;
s2, respectively adjusting bias voltages of a main circuit and an auxiliary circuit at a high temperature higher than a first temperature and a low temperature lower than a second temperature, so that an AMAM curve of the Doherty power amplifier keeps the same shape as that of the Doherty power amplifier at normal temperature, wherein the first temperature is 85 ℃ and the second temperature is-40 ℃;
s3, recording bias voltages of the main circuit and the auxiliary circuit at high temperature and low temperature;
s4, calculating the slopes of the bias voltages of the main circuit and the auxiliary circuit along with the temperature change according to the bias voltages of the first temperature point and the second temperature point, testing whether the DPD performance of the Doherty power amplifier at high temperature and low temperature meets the requirements or not by using the slopes and the bias voltages, and if so, entering S5;
and S5, applying the bias circuit and the slope calculated in S4 to different Doherty power amplifiers to verify DPD performance, and determining the bias voltage and the corresponding slope of the Doherty power amplifier if the DPD performance of the different Doherty power amplifiers meets the requirements of customers, generally-45 dBc.
In one embodiment, before adjusting the bias voltages of the main circuit and the auxiliary circuit at the high temperature and the low temperature respectively in step S2, the method further includes: the AMAM curves of the Doherty power amplifier were tested at high and low temperatures.
In an embodiment, in S4, if not, the method proceeds to step S1 to debug the Doherty power amplifier again, and determines the bias voltage and slope of the Doherty power amplifier again.
In an embodiment, in S5, if the DPD performance of different Doherty power amplifiers does not meet the requirement, the slope is determined again.
In an embodiment, the calibration process of the Doherty power amplifier includes:
a1, firstly, searching the quiescent current of the main circuit, judging whether the quiescent current reaches a preset range, and if so, entering A2;
a2, writing bias voltage corresponding to the quiescent current into the bias information storage module through the digital interface circuit;
a3, testing the radio frequency performance of the Doherty power amplifier, if the radio frequency performance meets the requirements of clients, entering A4,
and A4, writing the slope corresponding to the bias voltage into the bias information storage module through the digital interface circuit.
The invention also discloses another technical scheme: a Doherty power amplifier module system comprises the bias circuit.
The invention has the following beneficial effects:
1. the invention provides a novel Doherty power amplifier module system, which is used for carrying out temperature compensation on bias voltages of a main circuit and an auxiliary circuit of the Doherty power amplifier while realizing the miniaturization of the Doherty power amplifier, so that a generated AMAM curve can not be distorted along with the change of temperature.
2. When the Doherty power amplifier is used by a client, the Doherty power amplifier can be biased to a proper state only by providing an enabling signal, and the temperature compensation can be realized without any external circuit.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of a module structure of the Doherty power amplifier module system of the invention;
FIG. 2 is a flow chart illustrating a slope determination process according to the present invention;
fig. 3 is a schematic flow chart of the Doherty power amplifier calibration process of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
According to the Doherty power amplifier module system and the bias circuit thereof disclosed by the embodiment of the invention, the bias circuit is completely integrated in the Doherty power amplifier module system, so that the Doherty power amplifier is miniaturized, and meanwhile, the temperature compensation is carried out on the bias voltages of the main circuit and the auxiliary circuit, so that the generated AMAM curve cannot be distorted along with the temperature change. The Doherty radio-frequency amplifier can be used for a communication base station or any other occasions requiring a high-efficiency Doherty radio-frequency amplifier.
As shown in fig. 1, the bias circuit of the Doherty power amplifier module system disclosed in the embodiment of the present invention is integrated in the Doherty power amplifier module system to implement the function of internal bias. The bias circuit specifically comprises a temperature detection module, a Digital interface circuit, a bias information storage module, a control circuit, a Digital-to-analog converter (DAC) circuit and a Doherty power amplifier, wherein the temperature detection module is arranged in the Doherty power amplifier module system and connected with the control circuit, and is used for measuring the ambient temperature of the Doherty power amplifier and outputting a measured temperature signal to the control circuit after the control circuit sends an inquiry signal.
The digital interface circuit is connected with the control circuit and is used for setting the bias voltage of the Doherty power amplifiers in the debugging process of the Doherty power amplifiers or setting the bias voltage and the slope required when each Doherty power amplifier reaches the preset quiescent current in the calibration process of the Doherty power amplifiers and writing the bias voltage and the slope into the bias information storage module.
It should be noted that the calibration process of the Doherty power amplifier is actually a process of determining the bias voltage of each module at a given bias current. Usually, the bias voltage of each amplifier transistor will be different, so a calibration procedure is required to provide a proper bias voltage for the Doherty amplifier.
As shown in fig. 3, the calibration process of the Doherty power amplifier specifically includes:
a1, firstly, searching the quiescent current of the main circuit, then judging whether the quiescent current reaches a preset range, if so, entering A2, otherwise, calibrating the Doherty power amplifier to be an unqualified product, and ending the calibration, wherein the preset range is generally 19 mA-21 mA.
And A2, writing bias voltage corresponding to the quiescent current into the bias information storage module through the digital interface circuit.
A3, testing basic performances (including radio frequency performances such as power, efficiency and gain performance) of the Doherty power amplifier, judging whether the radio frequency performance meets the requirements, if so, entering A4, otherwise, calibrating the Doherty power amplifier to be an unqualified product, and ending the calibration.
And A4, writing a preset slope corresponding to the bias voltage into the bias information storage module through the digital interface circuit, and finishing the calibration process.
The bias information storage module is connected with the control circuit and used for storing the slope of the bias voltage changing along with the temperature and the bias voltage at normal temperature. In implementation, the slope may be stored in a table look-up manner or in an interpolation circuit. In this embodiment, the offset information storage module adopts an EEPROM memory. Preferably, the slope of the bias voltage changing with the temperature and the bias voltage at normal temperature can be adjusted through an external port.
Specifically, as shown in fig. 2, the slope determining process specifically includes:
s1, debugging the Doherty power amplifier at normal temperature to ensure that the Doherty power amplifier passes through DPD performance at normal temperature (generally 25 ℃), and determining the bias voltage of the main circuit and the auxiliary circuit of the Doherty power amplifier.
S2, respectively adjusting the bias voltage of the main circuit and the auxiliary circuit at a high temperature higher than a first temperature and a low temperature lower than a second temperature, so that the AMAM curve of the Doherty power amplifier keeps the same shape as that of the Doherty power amplifier at normal temperature, wherein the first temperature is 85 ℃ and the second temperature is-40 ℃.
And S3, recording the bias voltages of the main circuit and the auxiliary circuit at high temperature and low temperature.
S4, calculating the slopes of the bias voltages of the main circuit and the auxiliary circuit along with the temperature change through the bias voltages of the first temperature point and the second temperature point, testing whether the DPD performance of the Doherty power amplifier at high temperature and low temperature meets the requirements of customers or not by using the slopes and the bias voltages, wherein the requirements of the customers on the DPD performance are generally-45 dBc, and if yes, entering S5; if not, the step S1 is executed to debug the Doherty power amplifier again, and the bias voltage and the slope of the Doherty power amplifier are determined again.
S5, applying the bias circuit and the slope calculated in S4 to different Doherty power amplifiers to verify DPD performance, and determining the bias voltage and the corresponding slope of the Doherty power amplifier if the DPD performance of the different Doherty power amplifiers meets the customer requirements, generally-45 dBc; if not, the slope is determined again.
It should be noted that the slope generally has a great relationship with the debugging of the Doherty power amplifier circuit. If the Doherty power amplifier circuit is determined, the temperature slope of the Doherty power amplifier circuit is also determined, and the slope is generally applicable to different samples of the Doherty power amplifier circuit.
The control circuit is connected with the DAC circuit and used for actively inquiring the temperature detection module at the interval of Doherty power amplifier operation, receiving the temperature signal transmitted by the temperature detection module, searching out the corresponding bias voltage in the bias information storage module according to the temperature signal and outputting the bias voltage to the DAC circuit.
The DAC circuit is connected with the Doherty power amplifier and used for converting a digital signal type bias voltage signal transmitted by the control circuit into an analog signal to form the analog signal, and outputting the analog signal to the Doherty power amplifier, particularly to grid terminals of a main amplifier and a secondary amplifier of the Doherty power amplifier, so that temperature compensation is carried out on the bias voltage of the main amplifier and the secondary amplifier of the Doherty power amplifier.
The working principle of the bias circuit of the invention is as follows: in the power amplifier module written with the slope and the bias voltage at normal temperature, the control circuit actively queries the temperature detection module at the working interval of the Doherty power amplifier, then searches and interpolates the required bias voltage in the EEPROM according to the temperature signal fed back by the temperature detection module, and then controls the DAC circuit to output the proper bias voltage to the Doherty amplifier.
According to the technical scheme, the invention has the following advantages: the function of the output matching circuit of the original scheme is realized by few components, and meanwhile, the broadband, the high efficiency and the miniaturization are realized.
The systems, devices, modules or units illustrated in the above embodiments may be implemented by a computer chip or an entity, or by a product with certain functions.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A Doherty power amplifier module system and its bias circuit, characterized by that, the said bias circuit is integrated in the said Doherty power amplifier module system, the said bias circuit includes:
the power of the Doherty power amplifier is amplified,
the temperature detection module is used for measuring the ambient temperature of the Doherty power amplifier;
the bias information storage module is used for storing the slope of the bias voltage along with the change of the temperature and the bias voltage at normal temperature;
the control circuit is connected with the temperature detection module and the bias information storage module and is used for actively inquiring the temperature detection module at the working interval of the Doherty power amplifier, searching out corresponding bias voltage in the bias information storage module according to a temperature signal fed back by the temperature detection module and outputting the bias voltage to the DAC circuit;
and the input end of the DAC circuit is connected with the control circuit, and the output end of the DAC circuit is connected with the Doherty power amplifier and used for converting the digital signal transmitted by the control circuit into a bias voltage signal for controlling the Doherty power amplifier.
2. The bias circuit of the Doherty power amplifier module system of claim 1, wherein the circuit further comprises a digital interface circuit connected to the control circuit, for setting a bias voltage of the Doherty power amplifier during the debugging process of the Doherty power amplifier, or for setting a bias voltage and a slope required when each Doherty power amplifier reaches a preset quiescent current during the calibration process of the Doherty power amplifier.
3. The bias circuit of the Doherty power amplifier module system of claim 1, wherein the bias information storage module stores the slope by using a table look-up mode or an interpolation circuit.
4. The bias circuit of the Doherty power amplifier module system of claim 1 or 3, wherein the bias information storage module is an EEPROM memory.
5. The bias circuit of the Doherty power amplifier module system of claim 1, wherein the slope is determined during the debugging process of the Doherty power amplifier.
6. The bias circuit of the Doherty power amplifier module system of claim 5, wherein the determining of the slope comprises:
s1, debugging the Doherty power amplifier at normal temperature to ensure that the Doherty power amplifier passes through DPD performance at normal temperature and determines the bias voltage of the main circuit and the auxiliary circuit of the Doherty power amplifier;
s2, respectively adjusting bias voltages of a main circuit and an auxiliary circuit at a high temperature higher than a first temperature and a low temperature lower than a second temperature, so that an AMAM curve of the Doherty power amplifier keeps the same shape as that of the Doherty power amplifier at normal temperature, wherein the first temperature is 85 ℃ and the second temperature is-40 ℃;
s3, recording bias voltages of the main circuit and the auxiliary circuit at high temperature and low temperature;
s4, calculating the slopes of the bias voltages of the main circuit and the auxiliary circuit along with the temperature change according to the bias voltages of the first temperature point and the second temperature point, testing whether the DPD performance of the Doherty power amplifier at high temperature and low temperature meets the requirements or not by using the slopes and the bias voltages, and if so, entering S5;
and S5, applying the bias circuit and the slope calculated in S4 to different Doherty power amplifiers to verify DPD performance, and determining the bias voltage and the corresponding slope of the Doherty power amplifier if the DPD performance of the different Doherty power amplifiers meets the requirements of customers, generally-45 dBc.
7. The bias circuit of the Doherty power amplifier module system of claim 6, wherein in step S2, before adjusting the bias voltages of the main circuit and the auxiliary circuit at high temperature and low temperature respectively, further comprising: the AMAM curves of the Doherty power amplifier were tested at high and low temperatures.
8. The bias circuit of the Doherty power amplifier module system of claim 6, wherein in S4, if not, the step S1 is entered to debug the Doherty power amplifier again and to re-determine the bias voltage and slope of the Doherty power amplifier.
9. The bias circuit of the Doherty power amplifier module system of claim 2, wherein the calibration process of the Doherty power amplifier comprises:
a1, firstly, searching the quiescent current of the main circuit, judging whether the quiescent current reaches a preset range, and if so, entering A2;
a2, writing bias voltage corresponding to the quiescent current into the bias information storage module through the digital interface circuit;
a3, testing the radio frequency performance of the Doherty power amplifier, if the radio frequency performance meets the requirements of clients, entering A4,
and A4, writing the slope corresponding to the bias voltage into the bias information storage module through the digital interface circuit.
10. A Doherty power amplifier module system comprising the bias circuit of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911282719.8A CN110995171A (en) | 2019-12-13 | 2019-12-13 | Doherty power amplifier module system and bias circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911282719.8A CN110995171A (en) | 2019-12-13 | 2019-12-13 | Doherty power amplifier module system and bias circuit thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110995171A true CN110995171A (en) | 2020-04-10 |
Family
ID=70093345
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911282719.8A Withdrawn CN110995171A (en) | 2019-12-13 | 2019-12-13 | Doherty power amplifier module system and bias circuit thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110995171A (en) |
-
2019
- 2019-12-13 CN CN201911282719.8A patent/CN110995171A/en not_active Withdrawn
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4330549B2 (en) | High frequency power amplifier | |
| US11545945B2 (en) | Apparatus and method for calibrating an envelope tracking lookup table | |
| CN110677132B (en) | Radio frequency linear power amplifier circuit | |
| US8659356B2 (en) | Power supply circuit of power amplifier, and terminal | |
| US20040174213A1 (en) | Doherty bias circuit to dynamically compensate for process and environmental variations | |
| US20120249236A1 (en) | Amplifier Circuit, Mobile Communication Device and Method for Adjusting a Bias of a Power Amplifier | |
| CN107508644B (en) | Feedback channel on-line calibration method and device | |
| CN101640530A (en) | Detector circuit and system for a wireless communication | |
| JP5758795B2 (en) | Wireless communication device | |
| WO2023138600A1 (en) | Power detection circuit having temperature compensation function, and radio-frequency front-end module comprising power detection circuit | |
| CN106998195B (en) | Switching amplifier | |
| JP5454366B2 (en) | Power amplifier module and portable information terminal | |
| CN103477556B (en) | A kind of constant method and device of quiescent current of holding power amplifier | |
| CN110995171A (en) | Doherty power amplifier module system and bias circuit thereof | |
| CN1965472A (en) | Method and apparatus for DOHERTY amplifier biasing | |
| CN210157152U (en) | Voltage temperature drift compensation circuit of CATV signal amplifier | |
| US20070103187A1 (en) | Impedance circuit, power supply device | |
| US20200244235A1 (en) | Method and apparatus for compensating power amplifier performance | |
| JPWO2002031968A1 (en) | High frequency amplifier | |
| CN115078963B (en) | MMIC temperature characteristic test method | |
| CN113328619B (en) | Active bias power supply circuit of external bias radio frequency/microwave amplifier | |
| CN211403178U (en) | Auxiliary control circuit of power amplifier module, power amplifier module and communication equipment | |
| US9154080B2 (en) | Mixer with calibration circuit and calibration method thereof | |
| US6791312B1 (en) | Measuring power of analog signals | |
| CN211123689U (en) | Auxiliary control circuit of power amplifier module, power amplifier module and communication equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20200410 |
|
| WW01 | Invention patent application withdrawn after publication |