WO2023061086A1

WO2023061086A1 - Power amplifier

Info

Publication number: WO2023061086A1
Application number: PCT/CN2022/116399
Authority: WO
Inventors: 胡滨; 郭嘉帅
Original assignee: 深圳飞骧科技股份有限公司
Priority date: 2021-10-15
Filing date: 2022-09-01
Publication date: 2023-04-20
Also published as: CN216390921U

Abstract

Provided in the present utility model is a power amplifier. The power amplifier comprises an input matching network circuit, an amplification circuit module and an output matching network circuit, which are connected in sequence. An amplification stage circuit comprises a driving stage amplification circuit and an output stage amplification circuit, which are connected in sequence. A bias circuit comprises a positive temperature coefficient circuit and a negative temperature coefficient circuit, wherein the positive temperature coefficient circuit is used for generating a first bias voltage that has a positive temperature coefficient and outputting the first bias voltage to the driving stage amplification circuit, so that a gain of the driving stage amplification circuit increases along with temperature rise; the first bias voltage increases along with the temperature rise; the negative temperature coefficient circuit is used for generating a second bias voltage that has a negative temperature coefficient and outputting the second bias voltage to the output stage amplification circuit, so that a gain of the output stage amplification circuit decreases along with the temperature rise; and the second bias voltage decreases along with the temperature rise. The amplitude of a gain of a power amplifier of the present utility model changing along with temperature is small.

Description

power amplifier

technical field

The utility model relates to the field of amplifier circuits, in particular to a power amplifier.

Background technique

At present, with the development of mobile communication technology, especially in the application of mobile communication, the power amplifier has assumed an increasingly important role in the radio frequency amplifier circuit module in the mobile communication system.

The power amplifier in the related art includes an input matching network circuit, an amplifying circuit module and an output matching network circuit connected in sequence, and the amplifying circuit module includes a driving stage amplifying circuit, an output stage amplifying circuit and a bias circuit. The bias circuit is generally a bias circuit with a traditional negative temperature coefficient, and both the drive stage amplifier circuit and the output stage amplifier circuit are implemented by triode tubes.

However, the power amplifier of the related art adopts a driver stage amplifying circuit and an output stage amplifying circuit of a two-stage structure, and the turn-on voltage of the transistors in the driving stage amplifying circuit and the output stage amplifying circuit increases at low temperatures and decreases at high temperatures. For the impact on the performance of the power amplifier, the bias circuit generally uses a traditional negative temperature coefficient bias circuit to match the difference in quiescent current caused by the different turn-on voltages of high and low temperature transistors, but this compensation method cannot be used for high and low temperature gains. The difference is compensated so that the gain of the power amplifier varies greatly with temperature.

Therefore, it is necessary to provide a new power amplifier to solve the above problems.

Utility model content

Aiming at the above deficiencies in the prior art, the utility model proposes a power amplifier whose gain varies with temperature in a small range.

In order to solve the above technical problems, an embodiment of the present invention provides a power amplifier, which includes an input matching network circuit, an amplifying circuit module, and an output matching network circuit connected in sequence, and the input matching network circuit is used to connect externally connected The front-stage circuit is impedance-matched with the amplifying circuit module; the amplifying circuit module includes an amplifying stage circuit and a bias circuit, and the biasing circuit is used to adjust the bias voltage of the amplifying stage circuit to realize adjusting the amplifying stage The size of the output gain of the circuit; the output matching network circuit is used to realize its impedance matching with the externally connected rear stage circuit; the amplifier stage circuit includes a driver stage amplifier circuit and an output stage amplifier circuit connected in sequence, and the driver stage amplifier circuit The circuit is used to amplify the signal, and the output stage amplifying circuit is used to amplify the signal; the bias circuit includes a positive temperature coefficient circuit and a negative temperature coefficient circuit, and the positive temperature coefficient circuit is used to generate a first bias with a positive temperature coefficient setting voltage, and output the first bias voltage to the input of the driving stage amplifying circuit, so that the gain of the driving stage amplifying circuit increases with temperature; the first bias voltage increases with temperature increase by increasing; the negative temperature coefficient circuit is used to generate a second bias voltage with a negative temperature coefficient, and output the second bias voltage to the input of the output stage amplifier circuit, so that the The gain of the output stage amplifying circuit decreases as the temperature increases; the second bias voltage decreases as the temperature increases.

Preferably, the positive temperature coefficient circuit includes a first current mirror circuit with a positive temperature coefficient, and the positive temperature coefficient circuit outputs the first bias voltage through the first current mirror circuit.

Preferably, the negative temperature coefficient circuit includes a second current mirror circuit with a negative temperature coefficient, and the negative temperature coefficient circuit outputs the second bias voltage through the second current mirror circuit.

Preferably, the amplifying circuit of the driving stage is realized by transistors.

Preferably, the driving stage amplifier circuit is realized by NPN triode.

Preferably, the output-stage amplifying circuit is realized by transistors.

Preferably, the output-stage amplifying circuit is realized by an NPN triode.

Preferably, the amplifying stage circuit further includes a feedback circuit arranged in parallel with the driving stage amplifying circuit, and the feedback circuit is used to adjust the gain of the amplifying stage circuit.

Preferably, the amplifying stage circuit further includes an interstage matching circuit arranged between the driving stage amplifying circuit and the output stage amplifying circuit, and the interstage matching circuit is used to connect the driving stage amplifying circuit and the output stage amplifying circuit The above-mentioned output stage amplifying circuit realizes impedance matching.

Compared with the related art, the power amplifier of the present invention includes a positive temperature coefficient circuit and a negative temperature coefficient circuit by setting a bias circuit, and the positive temperature coefficient circuit outputs the first bias voltage to the driving stage amplifying circuit , so that the gain of the driver-stage amplifying circuit increases as the temperature increases; the negative temperature coefficient circuit outputs the second bias voltage to the output-stage amplifying circuit, so that the output-stage amplifying circuit The gain decreases with increasing temperature. Therefore, the gain of the amplifying stage circuit is the positive temperature coefficient gain of the driving stage amplifying circuit plus the negative temperature coefficient gain of the output stage amplifying circuit. The influence of high and low temperature on the gain of the amplifying stage circuit is reduced. Therefore, the variation range of the gain of the power amplifier of the utility model with temperature is small.

Description of drawings

Below in conjunction with accompanying drawing, describe the utility model in detail. Through the detailed description in conjunction with the following drawings, the content of the above or other aspects of the present invention will become clearer and easier to understand. In the attached picture,

Fig. 1 is the circuit structure diagram of the power amplifier of the utility model embodiment one;

Fig. 2 is the circuit structural diagram of the amplification stage circuit of the utility model embodiment two;

3 is a schematic diagram of a gain curve of a power amplifier in the related art;

Fig. 4 is a schematic diagram of the gain curve of the power amplifier of the present invention.

Detailed ways

The specific embodiment of the utility model will be described in detail below in conjunction with the accompanying drawings.

The specific implementations/embodiments described here are specific specific implementations of the present utility model, and are used to illustrate the concept of the present utility model. Limitations on the scope of utility models. In addition to the embodiments described here, those skilled in the art can also adopt other obvious technical solutions based on the claims of the application and the contents disclosed in the description, and these technical solutions include adopting any obvious changes made to the embodiments described here. The replacement and modified technical solutions are all within the protection scope of the present utility model.

(Embodiment 1)

The utility model provides a power amplifier 100 . Please refer to FIG. 1 , which is a circuit structure diagram of a power amplifier according to Embodiment 1 of the present invention.

The power amplifier 100 includes an input matching network circuit 1, an amplifying circuit module 2 and an output matching network circuit 3 connected in sequence,

The input matching network circuit 1 is used for impedance matching the externally connected pre-stage circuit and the amplifying circuit module 2 . The input terminal Pin of the input matching network circuit 1 is used as the signal input terminal of the power amplifier 100 .

Specifically, the amplifier circuit module 2 includes an amplifier stage circuit 21 and a bias circuit 22 .

The amplifying stage circuit 21 includes a driving stage amplifying circuit 211 and an output stage amplifying circuit 212 connected in sequence.

The driver amplifier circuit 211 is used for amplifying signals. The driving stage amplifying circuit 211 is realized by transistors. In this embodiment, the driver amplifier circuit 211 is realized by using an NPN triode.

The output stage amplifying circuit 212 is used for amplifying signals. The output stage amplifying circuit 212 is realized by transistors. In this embodiment, the output-stage amplifying circuit 212 is realized by using an NPN triode.

The bias circuit 22 is used for adjusting the bias voltage of the amplifier circuit 21 so as to adjust the output gain of the amplifier circuit 21 .

Specifically, the bias circuit 22 includes a positive temperature coefficient circuit 221 and a negative temperature coefficient circuit 222 .

The positive temperature coefficient circuit 221 is used to generate a first bias voltage VP with a positive temperature coefficient, and output the first bias voltage VP to the input of the driving stage amplifying circuit 211, so that the driving stage The gain of the amplifying circuit 211 increases as the temperature increases. The first bias voltage VP increases as the temperature increases.

In this embodiment, the positive temperature coefficient circuit 221 includes a first current mirror circuit with a positive temperature coefficient. The positive temperature coefficient circuit 221 outputs the first bias voltage VP through the first current mirror circuit.

The negative temperature coefficient circuit 222 is used to generate a second bias voltage VN with a negative temperature coefficient, and output the second bias voltage VN to the input of the output stage amplifying circuit 212, so that the output stage The gain of the amplifying circuit 212 decreases as the temperature increases. The second bias voltage VN decreases as the temperature increases.

In this embodiment, the negative temperature coefficient circuit 222 includes a second current mirror circuit with a negative temperature coefficient. The negative temperature coefficient circuit 222 outputs the second bias voltage VN through the second current mirror circuit.

The output matching network circuit 3 is used to achieve impedance matching with an externally connected subsequent stage circuit. The output terminal Pout of the output matching network circuit 3 is used as the signal output terminal of the power amplifier 100 .

The working principle of the power amplifier 100 to reduce the influence of temperature on the gain is as follows:

The positive temperature coefficient circuit 221 generates a first bias voltage VP with a positive temperature coefficient, and the first bias voltage VP increases as the temperature rises, so that the gain of the driving stage amplifier circuit 211 increases with temperature. high and increased.

The negative temperature coefficient circuit 222 is used to generate a second bias voltage VN with a negative temperature coefficient, and the second bias voltage VN decreases as the temperature rises, so that the gain of the output stage amplifying circuit 212 decreases with temperature increase and decrease.

The gain of the amplifying stage circuit 21 is the positive temperature coefficient gain of the driving stage amplifying circuit 211 plus the negative temperature coefficient gain of the output stage amplifying circuit 212, and the two kinds of gains cancel each other out due to the amplitude of high and low temperature changes, thereby increasing The amplitude reduces the influence of high and low temperature on the gain of the amplifier stage circuit 21 . Therefore, the variation range of the gain of the power amplifier 100 of the present invention with temperature is small.

(Example 2)

Embodiment 2 of the present utility model provides another power amplifier. Please refer to FIG. 2 . FIG. 2 is a circuit structure diagram of an amplifier stage circuit in Embodiment 2 of the present invention.

The circuit of the power amplifier of Embodiment 2 is basically the same as that of the power amplifier 100 of Embodiment 1, and the two differences are:

The amplifying stage circuit 21A of the power amplifier of the second embodiment also includes a feedback circuit 213 arranged in parallel with the driving stage amplifying circuit 211A and an interstage stage arranged between the driving stage amplifying circuit 211A and the output stage amplifying circuit 212A. matching circuit 214

The feedback circuit 213 is used to adjust the gain of the amplifier circuit 21A. Through the adjustment function of the feedback circuit 213, the gain of the amplifier stage circuit 21A is more stable, and the performance of the amplifier stage circuit 21A is better.

The inter-stage matching circuit 214 is used to achieve impedance matching between the driver stage amplifying circuit 211A and the output stage amplifying circuit 212A, so that the signal amplification performance of the amplifying stage circuit 21A is better.

In order to illustrate the variation of the gain of the power amplifier 100 of the present invention when the high and low temperature changes, a gain test is performed on a power amplifier of related technology and the signal of the output terminal Pout of the power amplifier 100 of the present invention.

Please refer to FIG. 3 , which is a schematic diagram of a gain curve of a power amplifier in the related art.

In the power amplifier of the related art, when the output power of the output terminal Pout is 15.897, the gain m71=32.421dB; the gain m72=31.897dB; the gain m73=31.078dB.

In the power amplifier of the related art, when the output power of the output terminal Pout is 28.085, the gain m81=32.545dB; the gain m82=31.994dB; the gain m83=31.085dB.

Please refer to FIG. 4 , which is a schematic diagram of the gain curve of the power amplifier of the present invention.

In the power amplifier 100 of the present invention, when the output power of the output terminal Pout is 16.002, the gain mm71=31.724dB; the gain mm72=32.002dB; the gain mm73=31.771dB.

In the power amplifier 100 of the present invention, when the output power of the output terminal Pout is 28.102, the gain mm81=31.081dB; the gain mm82=32.102dB; the gain mm83=31.754dB.

Through the comparison of the above data, it can be concluded that when the output power of the output terminal Pout is the same, the difference between the high and low temperature gains of the power amplifier 100 of the present invention is small, that is, the gain of the power amplifier 100 of the present invention has a small variation with temperature.

It should be pointed out that the relevant circuits, modules, transistors and NPN triode used in the utility model are all circuits, modules and components commonly used in the field, and the corresponding specific indicators and parameters are adjusted according to actual applications. Here, Do not go into details.

It should be noted that the various embodiments described above with reference to the accompanying drawings are only used to illustrate the utility model rather than limit the scope of the utility model, those of ordinary skill in the art should understand that without departing from the spirit and scope of the utility model Any modifications or equivalent replacements made to the present utility model under the premise of the present utility model shall be covered within the scope of the present utility model. Further, words appearing in the singular include the plural and vice versa unless the context otherwise requires. Additionally, all or a portion of any embodiment may be utilized with all or a portion of any other embodiment, unless stated otherwise.

Claims

A power amplifier comprising an input matching network circuit, an amplifying circuit module and an output matching network circuit connected in sequence,

The input matching network circuit is used to match the impedance of the externally connected pre-stage circuit with the amplifier circuit module;

The amplifying circuit module includes an amplifying stage circuit and a bias circuit, and the biasing circuit is used to adjust the bias voltage of the amplifying stage circuit to adjust the output gain of the amplifying stage circuit;

The output matching network circuit is used to realize its impedance matching with an externally connected subsequent stage circuit; it is characterized in that,

The amplifying stage circuit includes a driving stage amplifying circuit and an output stage amplifying circuit connected in sequence, the driving stage amplifying circuit is used for amplifying signals, and the output stage amplifying circuit is used for amplifying signals;

The bias circuit includes a positive temperature coefficient circuit and a negative temperature coefficient circuit,

The positive temperature coefficient circuit is used to generate a first bias voltage with a positive temperature coefficient, and output the first bias voltage to the input of the driving stage amplifying circuit, so that the gain of the driving stage amplifying circuit increases with increasing temperature; the first bias voltage increases with increasing temperature;

The negative temperature coefficient circuit is used to generate a second bias voltage with a negative temperature coefficient, and output the second bias voltage to the input of the output stage amplifying circuit, so that the gain of the output stage amplifying circuit decreases with increasing temperature; the second bias voltage decreases with increasing temperature.
The power amplifier according to claim 1, wherein the positive temperature coefficient circuit includes a first current mirror circuit with a positive temperature coefficient, and the positive temperature coefficient circuit outputs the first current mirror circuit through the first current mirror circuit. a bias voltage.
The power amplifier according to claim 1, wherein the negative temperature coefficient circuit includes a second current mirror circuit with a negative temperature coefficient, and the negative temperature coefficient circuit outputs the first current mirror circuit through the second current mirror circuit. Two bias voltages.
The power amplifier according to claim 1, characterized in that, the driving stage amplifying circuit is realized by transistors.
The power amplifier according to claim 4, characterized in that, the driving stage amplifying circuit is implemented by an NPN triode.
The power amplifier according to claim 1, wherein the output stage amplifying circuit is realized by transistors.
The power amplifier according to claim 6, wherein the output stage amplifying circuit is implemented by an NPN triode.
The power amplifier according to claim 1, wherein the amplifying stage circuit further comprises a feedback circuit arranged in parallel with the driving stage amplifying circuit, and the feedback circuit is used to adjust the gain of the amplifying stage circuit.
The power amplifier according to claim 1, wherein the amplifying stage circuit further comprises an interstage matching circuit arranged between the driver stage amplifying circuit and the output stage amplifying circuit, the interstage matching circuit It is used to realize impedance matching between the driving stage amplifying circuit and the output stage amplifying circuit.