WO2014023236A1

WO2014023236A1 - Power amplification apparatus and radio device

Info

Publication number: WO2014023236A1
Application number: PCT/CN2013/081015
Authority: WO
Inventors: 陈化璋; 安晋元; 王刚
Original assignee: 中兴通讯股份有限公司
Priority date: 2012-08-10
Filing date: 2013-08-07
Publication date: 2014-02-13
Also published as: CN103580611A

Abstract

A power amplification apparatus and a radio device, comprising a power divider, a carrier frequency amplifier, a peak amplifier and a microstrip line. The input ends of the carrier frequency amplifier and peak amplifier are connected to the output end of the power divider respectively, both the output end of the carrier frequency amplifier and the output end of the peak amplifier are connected to the input end of the microstrip line, and an air microstrip line is adopted for the connection between the output end of the peak amplifier and the input end of the microstrip line. The above technical solution that an air microstrip line is adopted in a power amplification apparatus can better facilitate the PCB layout and the power combination of a carrier frequency amplifier and a peak amplifier in a Doherty power amplifier and reduce the differential loss, thus realizing high efficiency and high linearity of power amplification more easily.

Description

Power amplification device and wireless device

Technical field

The present invention relates to the field of power amplification technologies, and in particular, to a power amplification device and a wireless device.

Background technique

In the wireless base station, the power amplifier determines the performance of the signal chain in terms of power consumption, linearity, efficiency and cost. The efficiency of the power amplifier has also become the focus of the industry competition. At present, all power amplifier manufacturers in the industry have invested in Doherty (Doherty). The research of technology, and the power amplifiers using Doherty technology are being shipped in large quantities, and the manufacturers have not stopped to continue to develop Doherty technology.

As shown in Figure 1, the traditional positive Doherty amplifier is divided into two ways, one is the main amplifier Main (Amplifier), or the carrier amplifier (Carrier Amplifier), which is in the ΑΒ state (linear state), and the other is the auxiliary amplifier. (Auxiliary Amplifier), or Peak Amplifier, is generally in Class B or Class C state (non-linear state). The input is a Willkinson second-class power splitter or a 3dB bridge. The input signal is divided into two paths. The input of the Peak Amplifier has a 1/4 wavelength line (50 ohms / 90 degrees) to balance the phase of the two channels; and the carrier Amplifier - the output of the circuit also has a 1/4 wavelength line, in addition to the input with the Peak Amplifier. The 1/4 wavelength line at the end responds to each other, and is also a key component for achieving load modulation when different signal strengths are achieved.

However, in some applications, positive Doherty may not be suitable, so anti-Doherty will be used. However, due to certain conditions such as tube layout, board size, etc., the offset line length after Peak Amplifier may not be suitable, resulting in power amplifier. The overall indicators are poor, such as low efficiency and poor linearity.

Summary of the invention

The technical problem to be solved by the embodiments of the present invention is to provide a power amplifying device and a wireless device, which can improve the efficiency and linearity of power amplification.

In order to solve the above technical problems, the following technical solutions are used:

A power amplifying device comprising: a power splitter, a carrier frequency amplifier, a peak amplifier, and a microstrip line, The input terminals of the carrier amplifier and the peak amplifier are respectively connected to an output end of the power splitter, and an output end of the carrier frequency amplifier and an output end of the peak amplifier are connected to the microstrip line At the input end, an output of the peak amplifier is connected to an input end of the microstrip line by an air microstrip line.

Optionally, the carrier frequency amplifier and the peak amplifier are power amplifier tubes of different power levels.

Optionally, the air microstrip line has a length of 1/4 wavelength.

Optionally, the microstrip line is a 90 degree microstrip line.

Optionally, the microstrip line is a 35 ohm / 90 degree microstrip line.

Optionally, the power divider is connected to the input end of the carrier amplifier by a 1/4 wavelength line.

Optionally, an offset line is connected between the power splitter and the input of the carrier amplifier, and between the power splitter and the input of the peak amplifier.

A wireless device, comprising a power amplifying device, wherein the power amplifying device comprises: a power splitter, a carrier frequency amplifier, a peak amplifier, and a microstrip line, wherein the input terminals of the carrier frequency amplifier and the peak amplifier are respectively connected to An output end of the power splitter, an output end of the carrier amplifier and an output end of the peak amplifier are connected to an input end of the microstrip line, an output end of the peak amplifier and the microstrip line The input ends are connected by an air microstrip line.

Optionally, the air microstrip line has a length of 1/4 wavelength.

Optionally, the microstrip line is a 90 degree microstrip line.

Optionally, the microstrip line is a 35 ohm / 90 degree microstrip line.

Optionally, an offset line is connected between the power splitter and an input end of the carrier amplifier, and between the power splitter and an input end of the peak amplifier. The above technical solution uses the air microstrip line in the power amplifying device, which is more advantageous for the PCB layout and the combination of the carrier frequency amplifier and the peak amplifier in the Doherty power amplifier, and the differential loss is also small, thereby making it easier to realize the high power amplifier. Efficiency and high linearity. BRIEF abstract

1 is an architectural diagram of a positive Doherty power amplifier in the related art;

2 is a structural diagram of an inverse Doherty power amplifier according to an embodiment of the present invention. Preferred embodiment of the invention

In the present embodiment, the air microstrip line is used in the inverse Doherty power amplifying device, which can solve the limitation of the pipe layout and the like, and is of great significance for improving the efficiency and linearity of the Doherty power amplifying device.

The structure of the inversion Doherty power amplifying device is relative to the structure of the positive Doherty power amplifying device. In short, the inverse Doherty power amplifying device is the carrier Amplifier and the Peak Amplifier of the positive Doherty power amplifying device in FIG. The positions are interchanged, but the offset line (offset3) at the output of the Peak Amplifier can be relatively short, because the 1/4 wavelength line at the output of the Peak Amplifier can be used instead of offset3 to achieve the small signal open circuit effect, so the size can be reduced. At the same time, it should be noted that the load of the Main Amplifier in the inverse Doherty power amplifying device is changed from 25 ohms to 50 ohms, or from 50 ohms to 100 ohms, as opposed to the impedance variation of the positive Doherty power amplifying device.

As shown in FIG. 2, the inverse Doherty power amplifying device device of the present embodiment includes: a power splitter, a carrier frequency amplifier, a peak amplifier, and a 35 ohm/90 degree microstrip line, wherein:

The power splitter is a Willkinson second-class power splitter or a 3dB bridge connected to the input.

The input of the Carrier Amplifier is connected to one output of the splitter. It has a 1/4 wavelength line (50 ohms/90 degrees) to balance the phase of the two channels. The output of the Carrier Amplifier and the 35 ohm/90 degree microstrip The input ends of the lines are connected; an offset line is connected between the input of the Carrier Amplifier and the power splitter.

The input of the Peak Amplifier is connected to one output of the splitter, and the output is connected to 35 ohms. The input of the /90-degree microstrip line is connected to the 1/4 wavelength line. In addition to the 1/4 wavelength line at the input of the Carrier Amplifier, it is also a key component in achieving the high-impedance state of the Peak Amplifier. The 1/4 wavelength line at the output of the Peak Amplifier is an air microstrip line, and the remaining microstrip lines are ordinary microstrip lines. When the air microstrip line is in an equal phase, it has a longer physical length than the ordinary microstrip line, and more It is advantageous to combine the two tubes when the carrier Amplifier and the Peak Amplifier are relatively large, and the difference of the air microstrip line is smaller than that of the ordinary microstrip line. An offset line is connected between the input of the Peak Amplifier and the power splitter.

The carrier amplifier and peak amplifier are power amplifier tubes of different power levels.

In the present embodiment, the air microstrip line is used instead of the 1/4 wavelength line at the output of the Peak Amplifier in the inverse Doherty power amplifying device. In some cases, such as tube layout, board size, etc., the distance between the Carrier Amplifier and the Peak Amplifier is large. If the ordinary microstrip line is used to combine the two tubes, the ordinary microstrip line to be used will be used. Will be too long, and because the dielectric constant of the air microstrip line is smaller than the ordinary microstrip line, the air microstrip is in the isophase

The physical length of the line is longer, so the air microstrip line can be used instead of the ordinary microstrip line to adapt to the occasion when the board size and tube layout are needed.

In addition, after the actual measurement, the air microstrip line will be smaller than the ordinary microstrip line. If the difference of the ordinary microstrip line is 1, the difference of the air microstrip line of the same length and the same material is 0.69. This is more conducive to reducing the loss of the peak path, improving the saturation power of the entire board, and making the linearity better.

The design circuit of the present embodiment is unique, and is advantageous for optimizing the size and the tube layout, and has high efficiency and good linearity.

The embodiment further provides a wireless device, including a power amplifying device, wherein the power amplifying device comprises: a power splitter, a carrier frequency amplifier, a peak amplifier, and a microstrip line, wherein the input terminals of the carrier frequency amplifier and the peak amplifier are respectively connected to The output of the power splitter, the output of the carrier amplifier and the output of the peak amplifier are connected to the input of the microstrip line, and the air microstrip line phase is used between the output of the peak amplifier and the input of the microstrip line. connection.

The length of the air microstrip line is 1/4 wavelength, and the microstrip line is a 35 ohm/90 degree microstrip line. The power divider is connected to the input of the carrier amplifier with a 1/4 wavelength line.

An offset line is connected between the splitter and the input of the carrier amplifier, and between the splitter and the input of the peak amplifier.

Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device so that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any particular combination of hardware and software.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Industrial applicability

The above technical solution uses the air microstrip line in the power amplifying device, which is more advantageous for the PCB layout and the combination of the carrier frequency amplifier and the peak amplifier in the Doherty power amplifier, and the differential loss is also small, thereby making it easier to realize the high power amplifier. Efficiency and high linearity. Therefore, the present invention has strong industrial applicability.

Claims

claims

1. A power amplification device, including: a power divider, a carrier frequency amplifier, a peak amplifier and a microstrip line, the input terminals of the carrier frequency amplifier and the peak amplifier are respectively connected to the output terminal of the power divider, The output end of the carrier frequency amplifier and the output end of the peak amplifier are both connected to the input end of the microstrip line, and an air micron is used between the output end of the peak amplifier and the input end of the microstrip line. Connected with wires.

2. The power amplifier device according to claim 1, wherein the carrier frequency amplifier and the peak amplifier are power amplifier tubes of different power levels.

3. The power amplification device according to claim 1, wherein the length of the air microstrip line is 1/4 wavelength.

4. The power amplification device according to claim 1, wherein the microstrip line is a 90-degree microstrip line.

5. The power amplifier device according to claim 4, wherein the microstrip line is a 35 ohm/90 degree microstrip line.

6. The power amplifier device according to claim 1, wherein the power divider and the input end of the carrier frequency amplifier are connected by a 1/4 wavelength line.

7. The power amplification device according to any one of claims 1 to 6, wherein: between the power divider and the input end of the carrier frequency amplifier, and between the power divider and the peak amplifier There are compensation (offset) lines connected between the input terminals.

8. A wireless device, including a power amplification device, wherein the power amplification device includes: a power splitter, a carrier frequency amplifier, a peak amplifier and a microstrip line, and the input terminals of the carrier frequency amplifier and the peak amplifier are respectively Connected to the output end of the power divider, the output end of the carrier frequency amplifier and the output end of the peak amplifier are both connected to the input end of the microstrip line, the output end of the peak amplifier and the microstrip line The input terminals of the strip lines are connected by air microstrip lines.

9. The wireless device of claim 8, wherein the carrier frequency amplifier and the peak amplifier For power amplifier tubes of different power levels.

10. The wireless device according to claim 8, wherein the length of the air microstrip line is 1/4 wavelength.

11. The wireless device according to claim 8, wherein the microstrip line is a 90-degree microstrip line.

12. The wireless device according to claim 11, wherein the microstrip line is a 35 ohm/90 degree microstrip line.

13. The wireless device according to claim 8, wherein the power divider and the input end of the carrier frequency amplifier are connected using a 1/4 wavelength line.

14. The wireless device according to any one of claims 8-13, wherein: between the power divider and the input end of the carrier frequency amplifier, and between the power divider and the peak amplifier There are compensation (offset) lines connected between the input terminals.