CN111510087A

CN111510087A - Co-time multi-frequency power amplifier circuit with multi-port frequency division output function

Info

Publication number: CN111510087A
Application number: CN202010299317.5A
Authority: CN
Inventors: 吴永乐; 陈孝攀; 王卫民; 杨雨豪
Original assignee: Beijing University of Posts and Telecommunications
Current assignee: Beijing University of Posts and Telecommunications
Priority date: 2020-04-16
Filing date: 2020-04-16
Publication date: 2020-08-07
Anticipated expiration: 2040-04-16
Also published as: CN111510087B

Abstract

The embodiment of the invention provides a common-time multi-frequency power amplifier circuit with a multi-port frequency division output function, which comprises: a substrate; the power amplifier circuit is arranged on the top layer of the substrate and is used for transmitting the radio-frequency signal of the branch circuit through the adjacent frequency open circuit network and reflecting the preset radio-frequency signals of other branch circuits, and the length of the open circuit branch node in the adjacent frequency open circuit network is a value of one-quarter wavelength of the preset radio-frequency signals of other branch circuits; the harmonic tuning and matching network is used for adjusting the harmonic impedance of the radio-frequency signal of the branch and matching the impedance of the output port of the branch to the optimal impedance required by the transistor to obtain the adjusted radio-frequency signal; the output port of each branch is used for outputting a path of regulated radio frequency signal as a path of single frequency signal.

Description

Co-time multi-frequency power amplifier circuit with multi-port frequency division output function

Technical Field

The invention relates to the technical field of electricity, in particular to a common-time multi-frequency power amplifier circuit with a multi-port frequency division output function.

Background

In recent years, the development of communication technology has been accelerated, and the applications of communication have become more diversified, so that the demand for communication, especially mobile communication, has been rapidly increased. With the increasing status of mobile communication, people put higher and higher demands on the utilization of spectrum resources. This therefore presents new challenges for radio frequency systems. The rf system may implement an electronic device to wirelessly communicate data with another electronic device and/or a network via rf signals.

The power amplifier is an important energy conversion and power output device in a radio frequency system, generally used as the tail end of an amplification system, and directly connected with a load to convert direct current energy into radio frequency energy. The power amplifier acts as a power output device, and its output power directly affects the transmission distance and quality of the wireless signal. The power amplifier is used as a high-power device, and the power consumption and the efficiency of the power amplifier also directly influence the overall power consumption and the efficiency of a radio frequency system.

A multiband radio frequency system in a radio frequency system can obtain multiple single frequency signals with different frequencies, and a dual-band radio frequency system for obtaining two single frequency signals with different frequencies is described below as an example, and a general dual-band radio frequency system includes: the dual-frequency power amplifier and the frequency divider can obtain two paths of single-frequency signals with different frequencies by combining the dual-frequency power amplifier and the frequency divider. The method comprises the following specific steps:

the dual-frequency power amplifier includes: the impedance matching of an input signal and an output signal is realized through a matching circuit by one input end of the double-frequency power amplifier and one output end of the double-frequency power amplifier, and one output end of the double-frequency power amplifier is connected to the frequency divider; signals of different frequency bands are generally transmitted by different antennas as input signals; an input end of the dual-frequency power amplifier receives an input signal, amplifies signals of different frequency bands to a target magnitude value, such as strength, and generates a path of amplified dual-frequency signal, and an output end of the dual-frequency power amplifier outputs the path of amplified dual-frequency signal; and transmitting the amplified dual-frequency signal to a frequency divider, and separating the amplified dual-frequency signal into two single-frequency signals with different frequencies by the frequency divider.

The input signal of the double-frequency power amplifier needs to be matched through the matching circuit, one path of amplified double-frequency signal is output, and two paths of single-frequency signals with different frequencies are obtained through the frequency divider.

Disclosure of Invention

The embodiment of the invention aims to provide a common-time multi-frequency power amplifier circuit with a multi-port frequency division output function, which is used for solving the problem that a multi-channel single-frequency signal multi-band radio frequency system with different frequencies occupies a large circuit area in the prior art. The specific technical scheme is as follows:

the embodiment of the invention provides a common-time multi-frequency power amplifier circuit with a multi-port frequency division output function, which comprises:

a substrate;

a power amplifier circuit disposed on a top layer of the substrate, wherein,

the power amplifier circuit includes: the input port, more than two output ports, the input matching network, the stabilizing network, the power supply network, the transistors and the output matching networks with the same number as the output ports are respectively connected between the input port and the output ports; the output matching network and the output port connected with the output matching network form a branch, and the number of the branches is the same as that of the output ports;

the output matching network for each branch comprises: the branch circuit comprises a branch port, an adjacent frequency open circuit network and a harmonic tuning and matching network, wherein the branch port is divided from a branch fork port; the adjacent frequency open circuit network comprises: the number of the transmission lines and the open-circuit branch nodes is the same as that of other branches except the branch;

the adjacent frequency open circuit network is used for transmitting the radio frequency signal of the branch and reflecting the preset radio frequency signals of other branches, and the length of the open circuit branch in the adjacent frequency open circuit network is a value of one-quarter wavelength of the preset radio frequency signals of other branches;

the harmonic tuning and matching network is used for adjusting the harmonic impedance of the radio-frequency signal of the branch circuit and matching the impedance of the output port of the branch circuit to the optimal impedance required by the transistor to obtain the adjusted radio-frequency signal;

and the output port of each branch is used for outputting one path of the adjusted radio-frequency signal as one path of single-frequency signal.

Further, the co-time multi-frequency power amplifier circuit with the multi-port frequency division output function further includes: a third capacitor and a first capacitor;

one end of the third capacitor is connected to a drain electrode bonding pad of the transistor, and the other end of the third capacitor is connected to the branch fork;

the first capacitor is connected between the input matching network and the input port, and one end of the first capacitor is connected with the input port.

Further, in the case that the two or more output ports are two output ports, the transmission line in the adjacent frequency open circuit network is a sixth transmission line, the open branch node in the adjacent frequency open circuit network is a fourth branch node,

sixth transmission line one end with a branch road port in the branch road bifurcation is connected, the sixth transmission line other end connect in the other end of fourth branch section with the junction of the seventh transmission line one end in the harmonic tuning and matching network, fourth branch section one end is opened circuit, the fourth branch section other end connect in the other end of sixth transmission line with the junction of seventh transmission line one end in the harmonic tuning and matching network.

Further, the harmonic tuning and matching network comprises: the transmission line in the harmonic tuning and matching network and the open-circuit branch node in the harmonic tuning and matching network are paired and have the same number, and the number of the transmission line in the harmonic tuning and matching network and the number of the open-circuit branch node in the harmonic tuning and matching network is not less than 1 and not more than 3.

Further, the transmission line in the harmonic tuning and matching network comprises a seventh transmission line and the open stub in the harmonic tuning and matching network comprises a fifth open stub, wherein

One end of the seventh transmission line is connected to the joint of the sixth transmission line and the fourth branch section, the other end of the seventh transmission line is connected to the joint of the other end of the fifth open-circuit branch section and one end of the transmission line in one output port of the branch circuit, one end of the fifth open-circuit branch section is open-circuited, and the other end of the fifth open-circuit branch section is connected to the joint of the other end of the seventh transmission line and one end of the transmission line in one output port of the branch circuit.

Further, the output port includes a ninth transmission line and an output port of the present branch, one end of the ninth transmission line is connected to the other end of the last transmission line in the harmonic tuning and matching network, and is connected to the other end of the last open-circuit stub in the harmonic tuning and matching network, and the other end of the ninth transmission line is connected to an output port of the present branch.

Further, the input matching network comprises: three transmission lines and three open-circuit stubs, wherein the three transmission lines in the input matching network are respectively a first transmission line, a second transmission line and a third transmission line, the three open-circuit stubs in the input matching network are respectively a first open-circuit stub, a second open-circuit stub and a third open-circuit stub, wherein,

one end of the first open-circuit branch node is open-circuit, and the other end of the first open-circuit branch node is connected to the joint of the other end of the first capacitor and one end of the first transmission line;

one end of the first transmission line is connected to the joint of the other end of the first capacitor and the other end of the first open-circuit branch node, the other end of the first transmission line is connected to the joint of the other end of the second open-circuit branch node and the other end of the second transmission line, one end of the second open-circuit branch node is open-circuit, and the other end of the second open-circuit branch node is connected to the joint of the other end of the first transmission line and the other end of the second transmission line;

one end of the second transmission line is connected to the junction of the second open-circuit branch section and the first transmission line, the other end of the second transmission line is connected to the junction of the other end of the third open-circuit branch section and one end of the third transmission line, one end of the third open-circuit branch section is open-circuited, and the other end of the third open-circuit branch section is connected to the junction of the other end of the second transmission line and one end of the third transmission line.

Further, the stabilizing network is connected between the input matching network and the source of the transistor, and the stabilizing network includes: a second capacitor and a first resistor, wherein,

one end of the second capacitor, which is connected with the first resistor in parallel, is connected with the other end of the third transmission line, and the other end of the second capacitor, which is connected with the first resistor in parallel, is connected with the grid electrode bonding pad of the transistor.

Further, the power supply network includes: an input power supply network and an output power supply network; wherein,

the input power supply network includes: a fourth transmission line and a first inductor, wherein,

one end of the first inductor is connected to the other end of the second capacitor, which is connected with the first resistor in parallel, and the other end of the first inductor is connected with one end of a fourth transmission line, and the other end of the fourth transmission line is connected with a direct-current power supply;

the output power supply network includes: the transistor comprises a fifth transmission line and a second inductor, wherein one end of the second inductor is connected to the drain electrode bonding pad of the transistor, the other end of the second inductor is connected with one end of the fifth transmission line, and the other end of the fifth transmission line is connected with a direct-current power supply.

Further, the input power supply network further includes: and the second resistor is connected between the other end of the fourth transmission line and the direct-current power supply.

The embodiment of the invention has the following beneficial effects:

according to the co-time multi-frequency power amplifier circuit with the multi-port frequency division output function, the adjacent frequency open circuit network is added in the output matching network of the power amplifier circuit, the length of the open circuit branch in the adjacent frequency open circuit network is one quarter wavelength of the preset radio frequency signals of other branches, and the adjacent frequency open circuit network is used for reflecting the energy of the preset radio frequency signals of other branches, so that the preset radio frequency signals of other branches cannot be transmitted to the branch, namely the branch is open, and only the radio frequency signals of the branch are reserved. An adjacent frequency open circuit network for realizing the frequency division function is added in the power amplifier circuit, which belongs to the device of the power amplifier, compared with the prior art of a frequency division circuit and a separation circuit of a double-frequency power amplifier, the circuit structure is simple, and the power amplifier circuit belongs to a miniaturized circuit; in addition, the power amplifier circuit outputs a plurality of paths of single-frequency signals with different frequencies through a plurality of output ends, and the complexity of an output matching network for processing the single-frequency signals of each branch is lower than that of the output matching network for processing one path of multi-frequency signals in the prior art, so that the circuit is simplified; in addition, since the power amplifier circuit is printed on the substrate, the area of the power amplifier circuit can be reduced in the integrated circuit, and therefore, the circuit area occupied by the common-time multi-frequency power amplifier circuit having the multi-port frequency-division output function in the embodiment of the present invention is smaller than that occupied by the conventional circuit.

Of course, not all of the advantages described above need to be achieved at the same time in the practice of any one product or method of the invention.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings 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 of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a basic circuit diagram of a co-time multi-frequency power amplifier circuit with a multi-port frequency-division output function according to an embodiment of the present invention;

FIG. 2 is a circuit schematic of an embodiment of the present invention;

FIG. 3 is a circuit plan structure diagram of an embodiment of the present invention;

FIG. 4 is a diagram illustrating simulation results of an input impedance curve of an input matching network in an embodiment of the present invention;

FIG. 5 is a diagram illustrating a simulation result of an S-parameter curve of an output matching network according to an embodiment of the present invention;

FIG. 6 is a diagram illustrating simulation results of S parameters of a co-time multi-frequency power amplifier circuit with multi-port frequency division output function at a center frequency of 3.5GHz according to an embodiment of the present invention;

FIG. 7 is a diagram illustrating simulation results of S parameters of a co-time multi-frequency power amplifier circuit with a multi-port frequency division output function according to an embodiment of the present invention at a center frequency of 5 GHz;

FIG. 8 is a diagram illustrating simulation results of variation of gain, output power and efficiency with input power of a co-time multi-frequency power amplifier circuit with multi-port frequency division output function at a center frequency of 3.5GHz according to an embodiment of the present invention;

FIG. 9 is a diagram illustrating simulation results of variation of gain, output power and efficiency with input power of a co-time multi-frequency power amplifier circuit with multi-port frequency division output function at a center frequency of 5GHz according to an embodiment of the present invention;

FIG. 10 is a diagram illustrating simulation results of variation of gain, output power and efficiency with frequency of a co-time multi-frequency power amplifier circuit with multi-port frequency division output function according to an embodiment of the present invention, when the center frequency is 3.5GHz and the input signal strength is 29 dBm;

fig. 11 is a diagram illustrating simulation results of changes in gain, output power and efficiency with frequency of a co-time multi-frequency power amplifier circuit with a multi-port frequency division output function according to an embodiment of the present invention when the center frequency is 5GHz and the input signal strength is 29 dBm.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.

First, for convenience of understanding the embodiments of the present invention, the following terms "first capacitor", "second capacitor", "third capacitor", "first resistor", "second resistor", "first inductor", "second inductor", "first transmission line" to "thirteenth transmission line", "first open stub" to "ninth open stub", "first output port" and "second output port" in the embodiments of the present invention will be introduced.

In the embodiment of the present invention, "first" of "first capacitor", "second" of "second capacitor", and "third" of "third capacitor" are used to distinguish the three capacitors herein, and no order limitation is made herein. The three capacitors in the embodiments of the present invention may be collectively referred to as a capacitor. The capacitance of the capacitor in the embodiment of the invention does not exceed 10 pF.

Similarly, "first" of "first resistor" and "second" of "second resistor" are also used to distinguish two resistors, and are not limited in sequence here. The first inductor and the second inductor are used to distinguish the two inductors, and the sequence is not limited herein. The "thirteenth" of the "first" to "thirteenth" transmission lines of the "first transmission line" is also used to distinguish thirteen transmission lines, and is not limited in sequence here. The "ninth" of the "first to" ninth open stubs "of the" first open stub "is also used to distinguish nine open stubs, and is not limited in sequence here. The "first" of the "first output port" and the "second" of the "second output port" are also used to distinguish the two ports, and are not limited in sequence here.

The transmission line and open stub may be 50 ohm transmission lines, which are named qualitatively and functionally.

The following description is continued on a co-time multi-frequency power amplifier circuit with a multi-port frequency-division output function according to an embodiment of the present invention.

Aiming at the problem that a multi-channel single-frequency signal multi-band radio frequency system with different frequencies is obtained in the prior art and the occupied circuit area is large, the embodiment of the invention provides a common-time multi-frequency power amplifier circuit with a multi-port frequency division output function. An adjacent frequency open circuit network for realizing the frequency division function is added in the power amplifier circuit, which belongs to the device of the power amplifier, compared with the prior art of a frequency division circuit and a separation circuit of a double-frequency power amplifier, the circuit structure is simple, and the power amplifier circuit belongs to a miniaturized circuit; in addition, the power amplifier circuit outputs a plurality of paths of single-frequency signals with different frequencies through a plurality of output ends, and the complexity of an output matching network for processing the single-frequency signals of each branch is lower than that of the output matching network for processing one path of multi-frequency signals in the prior art, so that the circuit is simplified; in addition, since the power amplifier circuit is printed on the substrate, the area of the power amplifier circuit can be reduced in the integrated circuit, and therefore, the circuit area occupied by the common-time multi-frequency power amplifier circuit having the multi-port frequency-division output function in the embodiment of the present invention is smaller than that occupied by the conventional circuit.

Referring to fig. 1 and fig. 2, a common-time multi-frequency power amplifier circuit with a multi-port frequency-division output function according to an embodiment of the present invention may include the following components:

a substrate;

a power amplifier circuit disposed on a top layer of the substrate, wherein,

the power amplifier circuit includes: the input matching network comprises an input port, more than two output ports, an input matching network 6, a stabilizing network 22, a power supply network, a transistor 15 and output matching networks, wherein the input matching network 6, the stabilizing network, the power supply network, the transistor 15 and the output matching networks are connected between the input port and the output ports; the output matching network and the output ports connected with the output matching network form a branch, and the number of the branches is the same as that of the output ports; wherein, the power supply network includes: an input supply network 231 and an output supply network 232;

the output matching network for each branch comprises: a branch port branched from the branch bifurcation, an adjacent frequency open circuit network 251 arranged between the branch port and the output port, and a harmonic tuning and matching network 252; the adjacent frequency open circuit network comprises: the transmission lines with the same number as the other branches except the branch and the open-circuit branch nodes with the same number as the other branches except the branch;

It should be noted that the adjacent frequency open circuit network may be connected to the branch ports, and the harmonic tuning and matching network may be connected between the adjacent frequency open circuit network and one output port, so as to obtain a single frequency signal of each branch. In the embodiment of the present invention, the transistor is not limited, and a High Electron Mobility Transistor (HEMT) based on gallium nitride (GaN for short) may be adopted, and the transistor model is CGH 40010F. The adjacent branch of the present transmission branch may refer to a branch other than the present branch.

In the embodiment of the invention, the adjacent frequency open circuit network is added in the output matching network of the power amplifier circuit, the length of the open circuit branch in the adjacent frequency open circuit network is one quarter wavelength of the preset radio frequency signal of other branches, and the adjacent frequency open circuit network is used for reflecting the energy of the preset radio frequency signal of other branches, so that the preset radio frequency signal of other branches cannot be transmitted to the branch, which is equivalent to open circuit, and only the radio frequency signal of the branch is reserved. An adjacent frequency open circuit network for realizing the frequency division function is added in the power amplifier circuit, which belongs to the device of the power amplifier, compared with the prior art of a frequency division circuit and a separation circuit of a double-frequency power amplifier, the circuit structure is simple, and the power amplifier circuit belongs to a miniaturized circuit; in addition, the power amplifier circuit outputs a plurality of paths of single-frequency signals with different frequencies through a plurality of output ends, and the complexity of an output matching network for processing the single-frequency signals of each branch is lower than that of the output matching network for processing one path of multi-frequency signals in the prior art, so that the circuit is simplified; in addition, since the power amplifier circuit is printed on the substrate, the area of the power amplifier circuit can be reduced in the integrated circuit, and therefore, the circuit area occupied by the common-time multi-frequency power amplifier circuit having the multi-port frequency-division output function in the embodiment of the present invention is smaller than that occupied by the conventional circuit.

The substrate may be a dielectric plate for providing a power amplifier circuit, and the number of layers of the substrate is not limited. In order to simplify the circuit and facilitate the implementation, the substrate can be a single-layer dielectric plate, and thus the design method of the single-layer dielectric plate is utilized to implement the circuit, the method is mature, and the design idea is simple. In some cases, the common-time multi-frequency power amplifier circuit with the multi-port frequency-division output function can be integrated and applied to other systems, and the substrate can be a multi-layer dielectric plate, which is determined according to actual conditions. The substrate can be but is not limited to Rogers RO4350B, which has a dielectric constant of 3.66, a thickness of 0.762mm, a dielectric loss of 0.0035, a port width W1 of 1.6mm, and any length. In the present example the length is 5 mm.

The top layer of the single-layer dielectric plate can be provided with a common-time multi-frequency power amplifier circuit with a multi-port frequency division output function, the bottom layer of the single-layer dielectric plate is a metal grounding surface, a cutting square hole is formed in the middle of the single-layer dielectric plate and used for connecting a transistor with a radiating fin, and the bottom layer and the top layer are connected through a metal through hole.

For convenience of explanation, the overall structure of the co-time multi-frequency power amplifier circuit having a multi-port frequency-division output function will be described with reference to fig. 1.

The common-time multi-frequency power amplifier circuit with the multi-port frequency division output function is a multi-port device in the whole view, wherein the power amplifier circuit comprises an input port and more than two output ports. The top layer power amplifier circuit comprises: the input matching network, the stabilizing network, the transistor, the power supply network and the output matching network with the same number of output ports. Therefore, an output matching network exists for each branch, and a single-frequency signal on each branch is obtained.

The output port is used for outputting a single-frequency signal of a target frequency, that is, a radio frequency signal of the branch, wherein the target frequency band may be set according to a user requirement. Of course, the number of the output ports is the same as the number of the required target frequencies, and the user can set the output ports according to the number of the required target frequencies. The preset radio frequency signals of the other branches may be set according to user requirements, and refer to other radio frequency signals except for the radio frequency signal of the branch.

For ease of understanding, the input matching network described above may include, but is not limited to: three open-circuit stubs and three transmission lines. The output matching network may include, but is not limited to, more than two open stubs, and the power supply network may include, but is not limited to, one transmission line and one inductor, where the inductor is a high-inductance-value inductor, and the high-inductance-value range is 10nH or more, and the optional high-inductance value is 18 nH. The stabilizing network may include, but is not limited to, a capacitor and a resistor. Therefore, the power amplifier circuit with more than two frequencies and with frequency division output function of more than two ports has good gain, high efficiency and good performance in two target frequency bands. The concrete description is as follows:

in order to create the optimal input impedance at the target frequency of more than two branches, the input matching network can be used to achieve the optimal input impedance at more than two frequency bands, with various implementations. In one possible implementation, the input matching network includes: the input matching network is used for achieving optimal input impedance under more than two frequency bands, wherein one end of the first open branch node is open, and the other end of the first open branch node is connected to a joint of the other end of the first capacitor and one end of the first transmission line;

one end of the first transmission line is connected to the joint of the other end of the first capacitor and the other end of the first open-circuit branch section, the other end of the first transmission line is connected to the joint of the other end of the second open-circuit branch section and the other end of the second transmission line, one end of the second open-circuit branch section is open, and the other end of the second open-circuit branch section is connected to the joint of the other end of the first transmission line and the other end of the second transmission line;

one end of the second transmission line is connected to the joint of the second open branch node and the first transmission line, the other end of the second transmission line is connected to the joint of the other end of the third open branch node and one end of the third transmission line, one end of the third open branch node is open, and the other end of the third open branch node is connected to the joint of the other end of the second transmission line and one end of the third transmission line; a transition band is arranged between the second transmission line and the first transmission line;

the other end of the third transmission line is connected with the stabilizing network; a transition zone is arranged between the third transmission line and the second transmission line.

In order to stabilize the circuit of the common-time multi-frequency power amplifier with the multi-port frequency division output function and not generate self-excitation, the stabilizing network can be used for stabilizing the circuit of the power amplifier and not generating self-excitation, and has a plurality of possible implementation modes. In one possible implementation, the stabilizing network is connected between the input matching network and the source of the transistor, and the stabilizing network includes: a second capacitor and a first resistor, wherein,

one end of the second capacitor, which is connected with the first resistor in parallel, is connected with the other end of the third transmission line, and the other end of the second capacitor, which is connected with the first resistor in parallel, is connected with a grid electrode bonding pad of the transistor.

To create a dc short, ac open condition, and provide dc bias without affecting the circuit, a power supply network may be used to power the gate and drain of the transistor, with a number of possible implementations, in one of which the power supply network includes: an input power supply network and an output power supply network; one end of the input power supply network is connected with a direct-current power supply, the other end of the input power supply network is connected with a grid electrode bonding pad of the transistor, one end of the output power supply network is connected with the direct-current power supply, and the other end of the output power supply network is connected with a drain electrode bonding pad of the transistor;

the input supply network comprises: a fourth transmission line and a first inductor for dc short, ac open, providing dc bias without affecting the circuit, wherein,

one end of the first inductor is connected to the other end of the second capacitor, which is connected with the first resistor in parallel, and the other end of the first inductor is connected with one end of a fourth transmission line;

the output supply network comprises: and one end of the second inductor is connected to the drain electrode bonding pad of the transistor, the other end of the second inductor is connected with one end of the fifth transmission line, and the other end of the fifth transmission line is connected with the direct-current power supply.

In order to enhance low frequency stability, in yet another possible implementation, the input supply network further includes: the input power supply network further comprises: and the second resistor is used for enhancing the low-frequency stability and is connected between the other end of the fourth transmission line and the direct-current power supply.

In order to block the input signal, in a possible implementation manner, the common-time multi-frequency power amplifier circuit with the multi-port frequency division output function further includes: a first capacitor for blocking an input signal;

in order to block the output signal, in a possible implementation manner, the common-time multi-frequency power amplifier circuit with the multi-port frequency division output function further includes: a third capacitor for blocking the output signal;

one end of the third capacitor is connected to a drain electrode bonding pad of the transistor, and the other end of the third capacitor is connected to the branch fork; the source electrode of the transistor is grounded, the grid electrode pad of the transistor is connected with the stabilizing network and an input power supply network in the power supply network, the drain electrode pad of the transistor is respectively connected with an output power supply network in the power supply network and one end of a third capacitor, and the output power supply network is positioned between the drain electrode pad of the transistor and one end of the third capacitor;

the first capacitor is connected between the input matching network and the input port, and one end of the first capacitor is connected with the input port. And each branch port is connected with the output matching network of one branch in a one-to-one correspondence manner.

The number of the branch ports is equal to the number of the output ports. Therefore, the output end of the third capacitor can be used for blocking, and then more than two branch ports are separated.

Based on above-mentioned more than two branch road ports, for output required single-frequency signal all the way of port more than two, every branch road corresponding to every branch road port in the branch road port more than two need keep single-frequency signal, to more than two branch road ports, an adjacent frequency open circuit network is connected to every branch road port, and it includes: the number of the transmission lines and the open-circuit stubs is the same as that of other branches except the branch. In the case that the two or more output ports are two output ports, the transmission line in the adjacent frequency open circuit network is a sixth transmission line, the open branch node in the adjacent frequency open circuit network is a fourth branch node,

sixth transmission line one end with a branch road port in the branch road bifurcation is connected, the sixth transmission line other end connect in the other end of fourth branch section with the junction of the seventh transmission line one end in the harmonic tuning and matching network, fourth branch section one end is opened circuit, the fourth branch section other end connect in the other end of sixth transmission line with the junction of seventh transmission line one end in the harmonic tuning and matching network. Such an adjacent frequency open circuit network serves to create an open circuit condition for another frequency, preventing the branch from affecting the other frequency.

In order to implement the harmonic adjustment of the multi-divided output function, the open-circuit stub of the harmonic tuning and matching network is used to create an open-circuit and short-circuit condition of the second and third harmonics, and the transmission line of the harmonic tuning and matching network is used to transmit the open-circuit and short-circuit condition of the harmonics to the drain plane of the transistor and to adjust the impedance matching, which can be implemented in a number of implementations, in one possible implementation, the harmonic tuning and matching network includes: the transmission line in the harmonic tuning and matching network and the open-circuit branch node in the harmonic tuning and matching network are paired and have the same number, and the number of the transmission line in the harmonic tuning and matching network and the number of the open-circuit branch node in the harmonic tuning and matching network is not less than 1 and not more than 3. The number of transmission lines in the harmonic tuning and matching network and the number of open stubs in the harmonic tuning and matching network are 1, which enables the effect of the harmonic tuning and matching network to be achieved, and in order to be able to enhance the effect of the harmonic tuning and matching network, the number of transmission lines in the harmonic tuning and matching network and the number of open stubs in the harmonic tuning and matching network may be 3. The number of transmission lines in the harmonic tuning and matching network and the number of open stubs in the harmonic tuning and matching network may both be adjusted according to the user's needs.

When the harmonic tuning and matching network comprises: in a possible implementation manner, the transmission line in the harmonic tuning and matching network includes a seventh transmission line and the open-circuit stub in the harmonic tuning and matching network includes a fifth open-circuit stub, where a specific connection manner is described as follows:

one end of the seventh transmission line is connected to the joint of the sixth transmission line and the fourth branch section, the other end of the seventh transmission line is connected to the joint of the other end of the fifth open-circuit branch section and one end of the transmission line in one output port of the branch circuit, one end of the fifth open-circuit branch section is open-circuited, and the other end of the fifth open-circuit branch section is connected to the joint of the other end of the seventh transmission line and one end of the transmission line in one output port of the branch circuit. Such a harmonic tuning and matching network is used to adjust the harmonic impedance for higher efficiency, and the matching network matches the 50 Ω impedance of the output port to the optimum impedance required by the transistor. The harmonic tuning network can be matched and fused with the input, and one network can simultaneously complete two functions of harmonic tuning and input matching.

In one possible implementation manner, the harmonic tuning and matching network of the branch includes a transmission line and an open-circuit branch, and in order to better implement the harmonic adjustment, the branch may be added according to actual situations, for example, the harmonic tuning and matching network of the branch includes: two transmission lines and two open stubs, so in yet another possible implementation, the harmonic tuning and matching network of this stub includes: a seventh transmission line, a fifth open-circuit stub, an eighth transmission line, and a sixth open-circuit stub,

one end of the seventh transmission line is connected to the joint of the sixth transmission line and the fourth branch node, the other end of the seventh transmission line is connected to the joint of the other end of the fifth branch node and one end of the eighth transmission line, one end of the fifth branch node is open, and the other end of the fifth branch node is open;

the other end of the eighth transmission line is connected to the joint of the other end of the sixth open branch section and one end of the ninth transmission line in one output port of the branch, one end of the sixth open branch section is open, and the other end of the sixth open branch section is connected to the joint of the other end of the eighth transmission line and one end of the ninth transmission line.

Similarly, in yet another possible implementation, the harmonic tuning and matching network of this branch may include, but is not limited to: and on the basis of the other possible implementation mode, a section of transmission line and an open branch node are added, and the adding mode is the same as that of the other possible implementation mode corresponding to the harmonic tuning and matching network of the branch circuit compared with one possible implementation mode, and detailed description is not given here.

In order not to affect the symmetry among the output ports, embodiments of the present invention provide a possible implementation manner, where the output ports include a ninth transmission line and one output port of the present branch, one end of the ninth transmission line is connected to the other end of the last transmission line in the harmonic tuning and matching network and is connected to the other end of the last open stub in the harmonic tuning and matching network, and the other end of the ninth transmission line is connected to one output port of the present branch. The ninth transmission line has the characteristic impedance of 50 omega for the line used for connecting the output port, has any length and has small influence on the index of an output network. The last transmission line and the last open stub refer to a transmission line and an open stub, respectively, near the output port in the harmonic tuning and matching network.

Compared with the conventional multi-frequency system which usually needs multiple power amplifiers, the multi-frequency system has higher manufacturing cost and is easy to cause resource waste, and even if the number of transistors of the multi-frequency power amplifier is reduced, the multi-frequency power amplifier still needs a frequency divider to carry out frequency division and then transmit the frequency division to antennas of different frequency bands for output. In a possible implementation manner of the embodiment of the invention, the co-time multi-frequency power amplifier circuit with the multi-port frequency division output function integrates the multi-port frequency division output function and the output matching network, so that the circuit structure is greatly simplified, the manufacture is more convenient, and meanwhile, the co-time multi-frequency power amplifier circuit also plays a great role in miniaturization and integration of a communication system.

In order to reduce the occupied area of the input port and the output port, the input port and the output port may be, but not limited to, subminiature SMA connectors. The characteristic impedance of the input port and the characteristic impedance of the output port are both 50 Ω.

For convenience of explanation, the following description will be made with the number of the output ports described above being 2. Under the condition that the number of the output ports is 2, the two target frequencies are respectively 3.5GHz and 5GHz, so that the method can be applied to the main working frequency band of the current 5G communication system under the sub 6G frequency band, and further can be widely applied to the current 5G system.

In order to obtain the above two target frequencies, referring to fig. 2 and 3, the power amplifier circuit includes: an input port, two output ports, an input matching network connected between the input port and the output ports, a stabilizing network, a power supply network, a transistor 15, and two output matching networks, wherein the two output matching networks include: a branch port that the branch divides into, the output matching network of first branch 7 with the output matching network of second branch 8, two output ports include: the output port 2 of the first branch and the output port 3 of the second branch, the output port 2 of the first branch and the output port 3 of the second branch in fig. 3, correspond to the output port 2 of the first branch and the output port 3 of the second branch in fig. 2. The circuit obtained by arranging the power amplifier circuit on the top layer of the substrate can be called a dual-frequency power amplifier circuit with a dual-port frequency division output function. The double-frequency power amplifier circuit with the double-port frequency division output function has the advantages of being simple in structure, high in efficiency, flat in gain, wide in bandwidth and the like while integrating the frequency division output function in power amplification.

Based on the dual-frequency power amplifier circuit with the dual-port frequency division output function, the input matching network can use a dual-frequency matching structure of three open-circuit branches, and the dual-frequency matching structure comprises three open-circuit branches and three sections of transmission lines. The output matching network comprises two open-circuit stubs, the power supply network comprises a section of transmission line and an inductor, wherein the inductor is a high-inductance-value inductor, the high-inductance-value inductor has a value range of more than 10nH, and the optional high-inductance value is 18 nH. The stabilizing network includes a capacitor and a resistor. Therefore, the double-frequency power amplifier circuit with the double-port frequency division output function has good gain, high efficiency and large output power, and has good performance in two target frequency bands. Compared with the traditional dual-frequency power amplifier, the adjacent-frequency open-circuit network is fused in the output matching network, which is equivalent to adding a frequency division function while dual-frequency amplification, and frequency division output while dual-frequency amplification is achieved. Referring to fig. 2 and 3, a specific connection mode based on the dual-frequency power amplifier circuit with the dual-port frequency-division output function is described as follows:

the number of the more than two output ports can be 2, and the dual-frequency power amplifier circuit with the dual-port frequency division output function comprises: a first capacitance 9 connected between the input matching network and the input port. The first capacitor 9 in fig. 3 corresponds to the capacitor C1 in fig. 2, the capacitance value is 20pF, and the input port 1 in fig. 3 corresponds to the input port 1 in fig. 2.

The input matching network comprises a first open branch T L1, a first transmission line T L2, a second open branch T L3, a second transmission line T L4, a third open branch T L5 and a third transmission line T L6, and a transition band is arranged between the second transmission line T L4 and the first transmission line T L2;

the other end of the third transmission line T L6 is connected to the stabilizing network, and a transition strip is provided between the third transmission line T L6 and the second transmission line T L4.

The stabilizing network includes a second capacitor 10 and a first resistor 11, in fig. 3, the second capacitor 10 corresponds to the capacitor C2 in fig. 2, the capacitance value is 5pF, and in fig. 3, the first resistor 11 corresponds to the resistor R1 in fig. 2, the resistance value is 50 Ω.

The input supply network comprises a fourth transmission line T L7 and a first inductor 13, a second resistor R2, the first inductor 13 can prevent leakage of ac energy, the first inductor 13 in fig. 3 corresponds to the inductor L1 in fig. 2, and the inductance value is 18 nH.

For the other end of the fourth transmission line T L7 being connected to a DC power supply, in order to complete the power supply, the port corresponding to the other end of the fourth transmission line T L7 is connected to a power supply capable of supplying power by a Direct Current (DC) power supply to provide the DC bias required by the transistor, and the port 4 corresponding to the other end of the fourth transmission line T L7 in fig. 3 corresponds to the port 4 corresponding to the other end of the fourth transmission line T L7 in fig. 2.

The output supply network comprises a fifth transmission line T L8 and a second inductor 14 the second inductor 14 in figure 3 corresponds to the inductor L2 in figure 2 with an inductance value of 18 nH.

For the other end of the fifth transmission line T L8 being connected to the DC power supply, in order to complete the power supply, the port corresponding to the other end of the fifth transmission line T L8 may be connected to a power supply through a DC power supply socket to provide the DC bias required by the transistor, and the port 5 corresponding to the other end of the fifth transmission line T L8 in fig. 3 corresponds to the port 5 corresponding to the other end of the fifth transmission line T L8 in fig. 2.

The circuit of the co-time dual-frequency power amplifier with the function of dual-port frequency division output further comprises: the third capacitor 12, the third capacitor 12 in fig. 3 corresponding to the capacitor C3 in fig. 2, has a capacitance of 20 pF. Thus, the port of the first branch is connected with the output matching network of the first branch, and the port of the second branch is connected with the output matching network of the second branch; that is, in the case where the branch bifurcation is divided into two branch ports, the two branch ports are connected to the output matching network of the first branch and the output matching network of the second branch, respectively.

Based on the two branch ports, the output matching network is two output matching networks which are respectively the output matching network of the first branch and the output matching network of the second branch;

the output matching network of the first branch comprises: the branch bifurcation is divided into a first branch port, an adjacent frequency open circuit network of the first branch connected with the first branch port, and a harmonic tuning and matching network of the first branch connected between the adjacent frequency open circuit network of the first branch and an output port of the first branch, wherein the branch bifurcation is divided into two branch ports, namely the two branch ports are respectively a first branch port and a second branch port; and each branch port is connected with the output matching network of one branch in a one-to-one correspondence manner. The concrete description is as follows:

the transmission branch in the adjacent frequency open circuit network of the first branch is a sixth transmission line T L19, the open circuit branch in the adjacent frequency open circuit network of this branch is a fourth branch T L11, the adjacent frequency open circuit network includes a sixth transmission line T L19 and a fourth branch T L11, wherein,

one end of a sixth transmission line T L19 is connected to one branch port of the branch branching port, the other end of the sixth transmission line T L19 is connected to the junction of the other end of the fourth branch T L11 and one end of the seventh transmission line T L13 in the harmonic tuning and matching network of the present branch, one end of the fourth branch T L11 is open, and the other end of the fourth branch T L11 is connected to the junction of the other end of the sixth transmission line T L19 and one end of the seventh transmission line T L13 in the harmonic tuning and matching network of the present branch.

The harmonic tuning and matching network of the first branch includes a seventh transmission line T L13, a fifth open-circuit stub T L15, an eighth transmission line T L17, and a sixth open-circuit stub T L23, wherein the open-circuit stubs of the harmonic tuning and matching network are used to create open-circuit and short-circuit conditions for the second and third harmonics, and the transmission lines of the harmonic tuning and matching network are used to transmit the open-circuit and short-circuit conditions for the harmonics to the drain plane of the transistor and to adjust the impedance matching.

One end of a seventh transmission line T L is connected to a connection of the sixth transmission line T L and the fourth transmission line T L, the other end of the seventh transmission line T L is connected to a connection of the other end of the fifth open stub T L and one end of the eighth transmission line T L, one end of the fifth open stub T L, and the other end of the fifth open stub T L is connected to a connection of the other end of the seventh transmission line T L and one end of the eighth transmission line T L;

the other end of the eighth transmission line T L17 is connected to a connection between the other end of the sixth open stub T L23 and one end of the ninth transmission line T L21 in one output port of the present branch, one end of the sixth open stub T L23 is open, and the other end of the sixth open stub T L23 is connected to a connection between the other end of the eighth transmission line T L17 and one end of the ninth transmission line T L21.

The output matching network of the second branch comprises: the branch fork is divided into a second branch port, an adjacent frequency open circuit network of the second branch connected with the second branch port, and a harmonic tuning and matching network of the second branch connected between the adjacent frequency open circuit network of the second branch and an output port of the second branch. The concrete description is as follows:

the transmission branch in the adjacent frequency open circuit network of the second branch is a tenth transmission line T L10, the open circuit branch in the adjacent frequency open circuit network of this branch is a seventh open branch T L12, the adjacent frequency open circuit network includes a tenth transmission line T L10 and a seventh open branch T L12, wherein,

one end of a tenth transmission line T L10 is connected to one branch port of the branch branching port, the other end of the tenth transmission line T L10 is connected to a connection point of the other end of the seventh open stub T L12 and one end of a seventh transmission line T L13 in the harmonic tuning and matching network of the present branch, one end of the seventh open stub T L12 is open, and the other end of the seventh open stub T L12 is connected to a connection point of the other end of the tenth transmission line T L10 and one end of the seventh transmission line T L13 in the harmonic tuning and matching network of the present branch.

The harmonic tuning and matching network of the second branch includes an eleventh transmission line T L14, an eighth open stub T L16, a twelfth transmission line T L18, and a ninth open stub T L20, wherein the open stubs of the harmonic tuning and matching network are used to create an open-short condition of the second third harmonic, and the transmission lines of the harmonic tuning and matching network are used to transmit the open-short condition of the harmonic to the drain plane of the transistor and to adjust the impedance matching.

One end of an eleventh transmission line T L14 is connected to the connection between the tenth transmission line T L10 and the seventh open branch T L12, the other end of the eleventh transmission line T L14 is connected to the connection between the other end of the eighth open branch T L16 and one end of the twelfth transmission line T L18, one end of the eighth open branch T L16, and the other end of the eighth open branch T L16 is connected to the connection between the other end of the eleventh transmission line T L14 and one end of the twelfth transmission line T L18;

the other end of the twelfth transmission line T L18 is connected to the connection between the other end of the ninth open stub T L20 and one end of the ninth transmission line T L21 in one output port of the present branch, one end of the ninth open stub T L20 is open, and the other end of the ninth open stub T L20 is connected to the connection between the other end of the twelfth transmission line T L18 and one end of the ninth transmission line T L21.

The output port of the first branch comprises a ninth transmission line T L21 and an output port of the present branch, one end of the ninth transmission line T L21 is connected to the other end of the eighth transmission line T L17 and the other end of the sixth open-circuit branch T L23, and the other end of the ninth transmission line T L21 is connected to an output port of the present branch.

The ninth transmission line T L21 has a line characteristic impedance of 50 Ω for output port connection, and has an arbitrary length, and has little influence on the index of the output network.

The output port of the second branch comprises a thirteenth transmission line T L22 and an output port of the present branch, one end of the thirteenth transmission line T L22 is connected to the other end of the eighth transmission line T L17 and the other end of the sixth open stub T L23, and the other end of the thirteenth transmission line T L22 is connected to an output port of the present branch.

The thirteenth transmission line T L22 has a line characteristic impedance of 50 Ω for output port connection, and has an arbitrary length, which has little influence on the specification of the output network.

The sixth open-circuit branch node T L23 in the first branch is the same as the sixth transmission line T L19, and the rest parts are the same as the second branch, a single branch of the output network in the embodiment of the invention has an extremely high reflection coefficient to the working frequency of the other branch, so that the adjacent frequency can be inhibited, and the working frequency of the branch can be well matched.

In the conversion from the schematic diagram of fig. 2 to the layout of fig. 3, the connection mode of each microstrip line and the open-circuit stub is as follows: the micro-strip lines with different widths are coupled by adopting a trapezoidal transition band micro-strip line with the width of 0.2mm to 1mm and the width of two ends of the trapezoidal transition band micro-strip line with the width of the two connected micro-strip lines so as to achieve the smooth transition of the width of the micro-strip line. The microstrip line with the length of the open-circuit branch node and the width of the microstrip line is coupled between the microstrip line and the open-circuit branch node so as to achieve the effect of complete connection.

Passive devices such as capacitors, inductors, resistors and the like are surface-mounted devices, and the specification is 0603, specifically, the passive devices are 1.6mm in length and 0.8mm in width. And the passive device and the microstrip line bonding pad are welded and coupled by adopting soldering tin. The transistor is also a surface-mounted device, is pressed with a radiator by adopting screws, and is welded with a circuit in a coupling mode by soldering tin.

The length and width identification numbers of the transmission lines in fig. 3 correspond to the transmission line numbers in fig. 2. The concrete description is as follows:

the input matching network located behind the input port in fig. 3 is composed of three sections of transmission lines and three open-circuit branches, the line width W1 of the first open-circuit branch is 0.4mm, the line width L1 is 19mm, the line width W2 of the first transmission line is 3.8mm, the line width L2 is 6mm, the line width W3 of the second open-circuit branch is 5mm, the line length L3 is 20mm, the line width W4 of the second transmission line is 1.5mm, the line width L4 is 11.5mm, a transition band with a width of 1mm is provided between the second transmission line and the first transmission line, the line width W5 of the third open-circuit branch is 5mm, the line width L5 is 18mm, the line width W6 of the third transmission line is 0.3mm, the line width L6 is 11.5mm, and a transition band with a width of 0.2mm is provided between the third transmission line and the second transmission line.

Fig. 4 is a diagram illustrating simulation results of an input impedance curve of the input matching network according to the embodiment of the present invention. The black curve is an input impedance curve of a connection port of the input matching network and the transistor, and the two multi-curve concentric circle clusters on the two sides are equivalent ratio circles obtained by source traction simulation of the transistor under 3.5GHz and 5 GHz. At both 3.5GHz and 5GHz frequencies, the impedance of the input matching network can fall within the optimum efficiency circle of the equivalence ratio curve. The input matching network of the embodiment of the invention provides good input double-frequency matching for the co-time double-frequency power amplifier circuit with the double-port frequency division output function, can be accurately matched in two target frequency bands, and has wider bandwidth.

The output matching network located behind the third capacitor in fig. 3 includes two branches, where the transverse first branch is a 3.5GHz output branch and is connected to the output port of the first branch.

The first branch is composed of three transmission lines and three open-circuit branches, the line width W9 of the sixth transmission line is 1.6mm, the line length L9 is 8.8mm, the line width W11 of the fourth branch is 0.4mm, the line length L11 is 8.8mm, the line width W13 of the seventh transmission line is 1.4mm, the line length L13 is 7.2mm, a 0.1mm width transition band is arranged between the seventh transmission line and the sixth transmission line, the line width W15 of the fifth open-circuit branch is 2mm, the line length L15 is 7.4mm, the line width W17 of the eighth transmission line is 3.2mm, the line length L17 is 1.0mm, 0.2mm width transition bands are arranged between the eighth transmission line, the seventh transmission line and the output port, the line width W19 of the sixth open-circuit branch is 1.0mm, and the line length L19 is 4.9 mm.

According to the simulation effect, the second branch circuit is formed by two transmission lines and two open-circuit branch nodes, wherein one transmission line and one open-circuit branch node are removed based on a schematic diagram, the line width W10 of a tenth transmission line is 1.4mm, the line length L10 is 12.8mm, the line width W12 of a seventh open-circuit branch node is 1.6mm, the line length L12 is 12.3mm, the line width W14 of an eleventh transmission line is 3.0mm, the line length L14 is 1.0mm, 0.2mm width transition zones are arranged between the eleventh transmission line and the tenth transmission line and between the eleventh transmission line and an output port, the line width W16 of an eighth open-circuit branch node is 1.4mm, and the line length L16 is 3.0 mm.

The output port of the first branch circuit and the input port of the second branch circuit are provided with microstrip lines with width WP and used for connecting the ports, and the length is arbitrary and is larger than 3 mm.

Fig. 5 shows a matching situation of the output matching network in the embodiment of the present invention. At the first branch with the working frequency of 3.5GHz and the frequency of 5GHz, S₂₁Below-60 dBm. A second branch with a working frequency of 5GHz and a frequency of 3.5GHz, S₂₁Below-30 dBm. The two branches of the embodiment of the invention form a fusion output network, each branch completes the matching of the target frequency and simultaneously equivalently opens the other frequency, and the function of dual-port frequency division output is realized after the two branches form the network.

Fig. 6 shows the small signal gain, return loss parameters of the input/output port according to an embodiment of the present invention; wherein, as shown in fig. 6, the parameters of the output port of the first branch at the center frequency of 3.5GHz are shown, and as shown in fig. 7, the parameters of the output port of the second branch at the center frequency of 5GHz are shown. Under the frequency of 3.5GHz, the small signal gain of the co-time dual-frequency power amplifier circuit with the dual-port frequency division output function can reach 14.5dB, the frequency range of the gain above 10dB is 3.37GHz to 3.63GHz, and the bandwidth reaches 0.26 GHz. The return loss of the 3.5GHz input/output ports is less than-10 dB. Under the frequency of 5GHz, the small signal gain of the co-time dual-frequency power amplifier circuit with the dual-port frequency division output function can reach 12.0dB, the frequency range with the gain above 10dB is 4.94GHz to 5.05GHz, and the bandwidth reaches 0.12 GHz. The return loss of the 5GHz input/output ports is less than-10 dB. The embodiment of the invention has good small-signal performance.

The simulation results of the variation of gain, output power and efficiency with input power in the embodiment of the invention are shown in fig. 8; fig. 8 shows parameters of the output port of the first branch at a frequency of 3.5GHz, and fig. 9 shows parameters of the output port of the second branch at a frequency of 5 GHz. Under the frequency of 3.5GHz, the-3 dB gain compression point is 26.7dBm of input power, the output power at the moment can reach 38.4dBm, and the efficiency reaches 55 percent. At 29.4dBm input, the efficiency peaks at 56.8%, at which time the output power is 39.3 dBm. Under the frequency of 5GHz, the-3 dB gain compression point is 30.1dBm of input power, the output power at the moment can reach 39.2dBm, and the efficiency reaches 47.4 percent. At an input power of 30.8dBm, the efficiency peaks at 47.7%, at which time the output power is 39.4 dBm. The embodiment of the invention has good output power and efficiency under the condition of a large signal of the central frequency.

FIG. 10 shows simulation results of gain, output power and efficiency with frequency at 29dBm input for an embodiment of the present invention; wherein, fig. 10 shows parameters of the output port of the first branch at the center frequency of 3.5GHz, and fig. 11 shows parameters of the output port of the second branch at the center frequency of 5 GHz. Under 3.5GHz, the highest efficiency of the co-time dual-frequency power amplifier circuit with the dual-port frequency division output function is 56.5%, the output power is 39.1dBm, and the gain is 10.1 dB. The efficiency is 3.36GHz to 3.66GHz in the frequency range of more than 40%, and the bandwidth reaches 0.3 GHz. Under 5GHz, the highest efficiency of the co-time dual-frequency power amplifier circuit with the dual-port frequency division output function is 45.8%, the output power is 38.7dBm, and the gain is 9.7 dB. The efficiency is in the frequency range of 4.95GHz to 5.06GHz above 40%, and the bandwidth reaches 0.11 GHz. The embodiment of the invention has good power efficiency performance and wider bandwidth under large signals in two frequency bands.

The size of the whole circuit is 47.6mm × 87.2.2 mm respectively, the circuit has the characteristics of miniaturization and integration, and is very beneficial to packaging devices, meanwhile, the occupied space of a subsequent frequency divider is saved, signals can be directly transmitted to an antenna for transmission, the circuit of the common-time dual-frequency power amplifier which is built by using the fusion network and has the function of dual-port frequency division output has good performance, and the circuit can achieve a remarkable effect on the miniaturization of the whole system.

The computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, e.g., from one website site, computer, server, or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DS L)) or wireless (e.g., infrared, wireless, microwave, etc.) manner to another website site, computer, server, or data center.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims

1. A co-time multi-frequency power amplifier circuit with multi-port frequency-division output, comprising:

a substrate;

a power amplifier circuit disposed on a top layer of the substrate, wherein,

the power amplifier circuit includes: the input port, more than two output ports, the input matching network, the stabilizing network, the power supply network, the transistors and the output matching networks with the same number as the output ports are respectively connected between the input port and the output ports; the output matching network and the output ports connected with the output matching network form a branch, and the number of the branches is the same as that of the output ports;

2. The co-time multi-frequency power amplifier circuit with multi-port frequency-division output capability of claim 1, wherein the co-time multi-frequency power amplifier circuit with multi-port frequency-division output capability further comprises: a third capacitor and a first capacitor;

3. The co-time multi-frequency power amplifier circuit with a multi-port frequency-division output function according to claim 2, wherein in the case where the two or more output ports are two output ports, the transmission line in the adjacent-frequency open network is a sixth transmission line, the open-circuit stub in the adjacent-frequency open network is a fourth open-circuit stub,

4. A co-time multi-frequency power amplifier circuit with multi-port crossover output capability as defined in claim 3, wherein the harmonic tuning and matching network comprises: the transmission line in the harmonic tuning and matching network and the open-circuit branch node in the harmonic tuning and matching network are paired and have the same number, and the number of the transmission line in the harmonic tuning and matching network and the number of the open-circuit branch node in the harmonic tuning and matching network is not less than 1 and not more than 3.

5. The co-time multi-frequency power amplifier circuit with multi-port crossover output capability of claim 4, wherein the transmission line in the harmonic tuning and matching network comprises a seventh transmission line and the open-circuit leg in the harmonic tuning and matching network comprises a fifth open-circuit leg, wherein,

6. The co-time multi-frequency power amplifier circuit with multi-port frequency-division output function of claim 5, wherein the output ports comprise a ninth transmission line and an output port of the local branch, one end of the ninth transmission line is connected to the other end of the last transmission line in the harmonic tuning and matching network and connected to the other end of the last open stub in the harmonic tuning and matching network, and the other end of the ninth transmission line is connected to an output port of the local branch.

7. The co-time multi-frequency power amplifier circuit with multi-port crossover output capability of claim 6, wherein said input matching network comprises: three transmission lines and three open-circuit stubs, wherein the three transmission lines in the input matching network are respectively a first transmission line, a second transmission line and a third transmission line, the three open-circuit stubs in the input matching network are respectively a first open-circuit stub, a second open-circuit stub and a third open-circuit stub, wherein,

8. A co-time multi-frequency power amplifier circuit with multi-port frequency-division output capability as claimed in claim 7 wherein said stabilizing network is connected between said input matching network and said transistor source, said stabilizing network comprising: a second capacitor and a first resistor, wherein,

9. A co-time multi-frequency power amplifier circuit with multi-port crossover output capability as defined in claim 8, wherein the power supply network comprises: an input power supply network and an output power supply network; wherein,

10. A co-time multi-frequency power amplifier circuit with multi-port crossover output capability as defined in claim 9, wherein the input supply network further comprises: and the second resistor is connected between the other end of the fourth transmission line and the direct-current power supply.