A power amplifier combining device

Abstract

The present application relates to the field of radio frequency technology, and more particularly to a kind of power amplifier synthesis device, including first power amplifier output matching circuit and second power amplifier output matching circuit, first power amplifier output matching circuit includes sequentially connected first power amplifier pair tube, first group impedance circuit and first output, second power amplifier output matching circuit includes sequentially connected second power amplifier pair tube, second group impedance circuit and second output;Combiner includes first input, second input and third output;First output is connected first input, second output is connected second input, the output impedance of first output and the output impedance of second output are all less than 50 ohms, the input impedance of first input and the input impedance of second input are all less than 50 ohms, the output impedance of third output is 50 ohms, by reducing the output impedance of first output, second output and the input impedance of combiner input, effectively reduce overall volume, reduce loss, improve synthesis efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of radio frequency technology, and in particular to a power amplifier synthesis device. BACKGROUND

[0002] The output of the existing super wideband high-power power amplifier is combined with a synthesizer to obtain a larger power output. The power amplifier and the synthesis are separated, the power amplifier needs to be matched from a low impedance to 50 ohms, and then cascaded and synthesized in a 50 ohm system, thereby resulting in a large volume of the power amplifier and a large volume of the synthesis part, and the overall device has a large volume. Therefore, it will cause large loss, thereby resulting in low synthesis efficiency. SUMMARY

[0003] In view of the above problems, the present application is proposed to provide a power amplifier synthesis device that overcomes the above problems or at least partially solves the above problems.

[0004] The present application provides a power amplifier synthesis device, which comprises:

[0005] The first power amplifier output matching circuit comprises a first power amplifier pair tube, a first set of impedance cables and a first output terminal connected in sequence, and the second power amplifier output matching circuit comprises a second power amplifier pair tube, a second set of impedance cables and a second output terminal connected in sequence;

[0006] The combiner comprises a first input terminal, a second input terminal and a third output terminal, and is used for power synthesis of the input signal and output;

[0007] The first output terminal is connected to the first input terminal, the second output terminal is connected to the second input terminal, the output impedance of the first output terminal and the output impedance of the second output terminal are both less than 50 ohms, the input impedance of the first input terminal and the input impedance of the second input terminal are both less than 50 ohms, and the output impedance of the third output terminal is 50 ohms.

[0008] Preferably, the first power amplifier pair tube and the second power amplifier pair tube each comprise a first power amplifier output terminal and a second power amplifier output terminal;

[0009] The first set of impedance cables and the second set of impedance cables each comprise a first microstrip line, a second microstrip line, a first coaxial cable, a second coaxial cable, a third microstrip line, a fourth microstrip line, a fifth microstrip line, a sixth microstrip line, a seventh microstrip line, a first capacitor, a second capacitor, a third coaxial cable and an eighth microstrip line, and the first coaxial cable, the second coaxial cable and the third coaxial cable each comprise an outer skin and an inner core;

[0010] The first microstrip line has one end connected to the first power amplifier output end, the second microstrip line has one end connected to the second power amplifier output end, the other end of the first microstrip line is connected to the outer skin of one end of the first coaxial cable, the inner core of the other end of the first coaxial cable is connected to the other end of the second microstrip line, the other end of the second microstrip line is connected to the outer skin of one end of the second coaxial cable, the inner core of the other end of the second coaxial cable is connected to the other end of the first microstrip line, the two ends of the third microstrip line are respectively connected to the inner core of the other end of the first coaxial cable and the inner core of the other end of the second coaxial cable, and the outer skin of the other end of the first coaxial cable is connected to one end of the fourth microstrip line, the outer skin of the other end of the second coaxial cable is connected to one end of the seventh microstrip line, the other end of the fourth microstrip line is connected to one end of the fifth microstrip line through a first capacitor, the other end of the seventh microstrip line is connected to the sixth microstrip line through a second capacitor, the other end of the fifth microstrip line is connected to the outer skin of one end of the third coaxial cable, the sixth microstrip line is connected to the inner core of one end of the third coaxial cable, the outer skin of the other end of the third coaxial cable is grounded, the inner core of the other end of the third coaxial cable is connected to one end of the eighth microstrip line, in the first group of impedance cables, the other end of the eighth microstrip line is connected to the first input end, and in the second group of impedance cables, the other end of the eighth microstrip line is connected to the second input end.

[0011] Preferably, the first microstrip line is used to increase the output impedance of the first power amplifier output end by a first preset multiple, and the second microstrip line is used to increase the output impedance of the second power amplifier output end by the first preset multiple.

[0012] The first coaxial cable is used to increase the output impedance by a second preset multiple, and the second coaxial cable is used to increase the output impedance by the second preset multiple.

[0013] The third coaxial cable is used to increase the output impedance by a third preset multiple, so that the output impedance of the first output end and the output impedance of the second output end are both less than 50 ohms.

[0014] Preferably, the characteristic impedance of the first coaxial cable and the characteristic impedance of the second coaxial cable are 12 ohms to 17 ohms.

[0015] The characteristic impedance of the third coaxial cable is 25 ohms to 35 ohms.

[0016] Preferably, the combiner comprises a fourth coaxial cable, a fifth coaxial cable, a ninth microstrip line, a tenth microstrip line, a first isolation resistor, a second isolation resistor, and an eleventh microstrip line.

[0017] The inner core of one end of the fourth coaxial cable is connected to the first input end, the outer skin of one end of the fourth coaxial cable is connected to one end of the first isolation resistor, the other end of the first isolation resistor is connected to one end of the ninth microstrip line, the other end of the ninth microstrip line is connected to the outer skin of the other end of the fourth coaxial cable and one end of the second isolation resistor.

[0018] The inner core of one end of the fifth coaxial cable is connected to the second input end, the outer skin of one end of the fifth coaxial cable is connected to the other end of the first isolation resistor, one end of the first isolation resistor is connected to one end of the tenth microstrip line, and the other end of the tenth microstrip line is connected to the outer skin of the other end of the fifth coaxial cable and the other end of the second isolation resistor.

[0019] The inner core of the other end of the fourth coaxial cable and the inner core of the other end of the fifth coaxial cable are both connected to one end of the eleventh microstrip line, and the other end of the eleventh microstrip line is connected to the third output end.

[0020] Preferably, the characteristic impedance of the fourth coaxial cable and the characteristic impedance of the fifth coaxial cable are both 12 ohms-50 ohms.

[0021] Preferably, the input impedance of the first input end and the input impedance of the second input end are 12.5 ohms-25 ohms.

[0022] The one or more technical solutions in the embodiments of the present application have at least the following technical effects or advantages:

[0023] The present application provides a power amplifier synthesis device, comprising a first power amplifier output matching circuit and a second power amplifier output matching circuit, the first power amplifier output matching circuit comprising a first power amplifier pair, a first set of impedance circuits and a first output end connected in sequence, the second power amplifier output matching circuit comprising a second power amplifier pair, a second set of impedance circuits and a second output end connected in sequence; a combiner comprising a first input end, a second input end and a third output end, for power synthesis and output of input signals; the first output end is connected to the first input end, the second output end is connected to the second input end, and the output impedance of the first output end and the output impedance of the second output end are both less than 50 ohms, the input impedance of the first input end and the input impedance of the second input end are both less than 50 ohms, and the output impedance of the third output end is 50 ohms, thereby reducing the overall volume of the power amplifier module by reducing the output impedance of the first output end and the second output end, reducing the input impedance of the combiner input end also reduces the volume of the combiner, thereby reducing the overall volume, reducing the loss and improving the synthesis efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0024] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are for purposes of illustration only and are not considered a limitation of the present application. Moreover, like reference numerals are used to designate identical components throughout the specification. In the drawings:

[0025] Figure 1 The structure of the power amplifier synthesis device in the embodiment of the present application is shown in the structural schematic diagram;

[0026] Figure 2A specific structure diagram of the power amplifier synthesizing device in the embodiment of the present application is shown.

[0027] Figure 3 A diagram showing the signal gain variation in the embodiment of the present application is shown.

[0028] Figure 4 A diagram showing the power amplifier efficiency variation with frequency in the embodiment of the present application is shown. DETAILED DESCRIPTION

[0029] Exemplary embodiments of the present disclosure will be described in detail with reference to the drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be accurately conveyed to those skilled in the art.

[0030] The embodiment of the present application provides a power amplifier synthesizing device, as shown in the accompanying drawings, comprising: Figure 1

[0031] The first power amplifier output matching circuit 101 comprises a first power amplifier pair 1011, a first set of impedance cables 1012 and a first output terminal 1013 connected in sequence, and the second power amplifier output matching circuit 102 comprises a second power amplifier pair 1021, a second set of impedance cables 1022 and a second output terminal 1023 connected in sequence;

[0032] The combiner 103 comprises a first input terminal 1031, a second input terminal 1032 and a third output terminal 1033, and is used for power synthesis of input signals and output;

[0033] The first output terminal 1013 is connected to the first input terminal 1031, the second output terminal 1023 is connected to the second input terminal 1032, the output impedance of the first output terminal and the output impedance of the second output terminal are both less than 50 ohms, the input impedance of the first input terminal and the input impedance of the second input terminal are both less than 50 ohms, and the output impedance of the third output terminal is 50 ohms.

[0034] By reducing the output impedance of the first output terminal 1013 and the second output terminal 1023, the line of impedance transformation used is reduced, the overall volume of the power amplifier module is effectively reduced, the input impedance of the input terminal of the combiner 103 is also reduced, thereby reducing the overall volume, reducing the loss and improving the synthesis efficiency.

[0035] The specific structure of the first power amplifier output matching circuit 101 and the second power amplifier output matching circuit 102 will be described in detail below. As shown in the accompanying drawings, Figure 2 the first power amplifier output matching circuit 101 comprises a first power amplifier pair 1011, a first set of impedance cables 1012 and a first output terminal 1013 connected in sequence, and the second power amplifier output matching circuit 102 comprises a second power amplifier pair 1021, a second set of impedance cables 1022 and a second output terminal 1023 connected in sequence.​

[0036] The first power amplifier output matching circuit 101 and the second power amplifier output matching circuit 102 are the same in structure, and the first power amplifier output matching circuit 101 is described in detail as follows:

[0037] The first power amplifier output matching circuit 101 comprises a first power amplifier pair tube 1011, a first impedance circuit 1012 and a first output end 1013 connected in sequence, wherein the first power amplifier pair tube 1011 comprises a first power amplifier output end and a second power amplifier output end, and the second power amplifier pair tube 1021 also comprises a first power amplifier output end and a second power amplifier output end, which are specifically two output ends of two power amplifier tubes.

[0038] The first impedance circuit 1012 and the second impedance circuit 1022 each comprise a first microstrip line 2, a second microstrip line 3, a first coaxial cable 5, a second coaxial cable 4, a third microstrip line 6, a fourth microstrip line 8, a fifth microstrip line 11, a sixth microstrip line 10, a seventh microstrip line 7, a first capacitor 91, a second capacitor 92, a third coaxial cable 12 and an eighth microstrip line 13, and the first coaxial cable 5, the second coaxial cable 4 and the third coaxial cable 12 each comprise an outer skin and an inner core.

[0039] Specifically, one end of the first microstrip line 2 is connected to the first power amplifier output end to increase the impedance output by the first power amplifier output end to a first preset impedance, one end of the second microstrip line 3 is connected to the second power amplifier output end to increase the impedance output by the second power amplifier output end to the first preset impedance, the other end of the first microstrip line 2 is connected to the outer skin of one end of the first coaxial cable 5, the inner core of one end of the first coaxial cable 5 is connected to the other end of the second microstrip line 3, the other end of the second microstrip line 3 is connected to the outer skin of one end of the second coaxial cable 4, the inner core of the second coaxial cable 4 is connected to the other end of the first microstrip line 2, the third microstrip line 6 has two ends respectively connected to the inner core of the other end of the first coaxial cable 5 and the inner core of the other end of the second coaxial cable 4, the outer skin of the other end of the first coaxial cable 5 is connected to one end of the fourth microstrip line 8, the outer skin of the other end of the second coaxial cable 4 is connected to one end of the seventh microstrip line, the other end of the fourth microstrip line 8 is connected to one end of the fifth microstrip line 11 through the first capacitor 91, the other end of the seventh microstrip line 7 is connected to one end of the sixth microstrip line 11 through the second capacitor 92, the other end of the fifth microstrip line 11 is connected to the outer skin of one end of the third coaxial cable 12, the sixth microstrip line 10 is connected to the inner core of one end of the third coaxial cable 12, the outer skin of the other end of the third coaxial cable 12 is grounded, the inner core of the other end of the third coaxial cable 12 is connected to one end of the eighth microstrip line 13, in the first impedance circuit 1012, the other end of the eighth microstrip line 13 is connected to the first input end 1031, and in the second impedance circuit 1022, the other end of the eighth microstrip line 13 is connected to the second input end 1032.

[0040] The first capacitor 91 and the second capacitor 92 are both DC blocking capacitors, so as to ensure that the RF signal passes through and the DC signal does not pass through.

[0041] The first microstrip line 2 is used to increase the output impedance of the first power amplifier output end by a first preset multiple, and the second microstrip line 3 is used to increase the output impedance of the second power amplifier output end by the first preset multiple; if the output of the first power amplifier tube is 1.5 ohms, after passing through the first microstrip line 2 and the second microstrip line 3, the output impedance is 3 ohms.

[0042] Next, the first coaxial cable 5 is used to increase the output impedance by a second preset multiple, and the second coaxial cable 4 is used to increase the output impedance by the second preset multiple. Before the first coaxial cable 5 and the second coaxial cable 4, the output impedance is 3 ohms, and then after passing through the first coaxial cable 5 and the second coaxial cable 4, the output impedance is 12 ohms.

[0043] Next, after passing through the third coaxial cable 12, the output impedance is increased from 12 ohms to 25 ohms.

[0044] Specifically, the characteristic impedance of the first coaxial cable 5 and the characteristic impedance of the second coaxial cable 4 are both 12 ohms-17 ohms. The characteristic impedance of the third coaxial cable 13 is 25 ohms-35 ohms.

[0045] By reducing the output impedance of the first output end 1013 of the first power amplifier output matching circuit 101 and reducing the output impedance of the second output end 1023 of the second power amplifier output matching circuit 102, the number of coaxial cables is effectively saved, so as to reduce the volume of the entire power amplifier. The output impedance of the first output end 1013 and the output impedance of the second output end 1023 are both less than 50 ohms. Specifically, it can be 12.5 ohms-25 ohms. It cannot be too small, otherwise the power of the RF signal will be reduced, which is not conducive to transmission.

[0046] Next, the combiner 103 specifically includes: a fourth coaxial cable 15, a fifth coaxial cable 18, a ninth microstrip line 14, a tenth microstrip line 17, a first isolation resistor 161, a second isolation resistor 162, and an eleventh microstrip line 19.

[0047] The inner core of one end of the fourth coaxial cable 15 is connected to the first input end 1031, the outer skin of one end of the fourth coaxial cable 15 is connected to one end of the first isolation resistor 161, the other end of the first isolation resistor 161 is connected to one end of the ninth microstrip line 14, and the other end of the ninth microstrip line 14 is connected to the outer skin of the other end of the fourth coaxial cable 15 and the other end of the second isolation resistor 162.

[0048] The inner core of one end of the fifth coaxial cable 18 is connected to the second input end 1032, and the outer skin of one end of the fifth coaxial cable 18 is connected to the other end of the first isolation resistor 161, and the other end of the first isolation resistor 162 is connected to one end of the tenth microstrip line 17, and the other end of the tenth microstrip line 17 is connected to the outer skin of the other end of the fifth coaxial cable and the other end of the second isolation resistor.

[0049] The inner core of the other end of the fourth coaxial cable 15 and the inner core of the other end of the fifth coaxial cable 18 are both connected to one end of the eleventh microstrip line 19, and the other end of the eleventh microstrip line 19 is connected to the third output end 1033.

[0050] The characteristic impedance of the fourth coaxial cable 15 and the characteristic impedance of the fifth coaxial cable 18 are both 12 ohms~50 ohms.

[0051] The input impedance of the first input end 1031 of the combiner 103 and the input impedance of the second input end 1032 are both less than 50 ohms, specifically 12.5 ohms~25 ohms. By reducing the input impedance of the combiner 103, the number of coaxial cables inside the combiner is reduced, effectively reducing the overall size of the combiner 103.

[0052] The combiner 103 with low input impedance can make the impedance at the connection between the two input ends of the combiner 103 and the first power amplifier output matching circuit 101 and the second power amplifier output matching circuit 102 consistent, directly connected, conjugate matched, and then synthesized at the low impedance, without the need for separate matching to 50 ohms. With such a subcircuit structure, not only is the excess circuit structure saved, but the insertion loss is also reduced, and the broadband matching of the power amplifier is also easier, which breaks through the difficulty of broadband matching of the power amplifier.

[0053] The corresponding signal gain and power amplifier efficiency change with frequency are obtained by the power amplifier synthesis device using the test data shown in the following table, as shown in the following table. Figure 3 Figure 4

[0054]

[0055] The one or more technical solutions in the embodiment of the application have at least the following technical effects or advantages:

[0056] ​​The application provides a power amplifier synthesizing device, which comprises a first power amplifier output matching circuit and a second power amplifier output matching circuit, the first power amplifier output matching circuit comprises a first power amplifier pair, a first set of impedance circuits and a first output end which are sequentially connected, the second power amplifier output matching circuit comprises a second power amplifier pair, a second set of impedance circuits and a second output end which are sequentially connected; a combiner, which comprises a first input end, a second input end and a third output end, is used for power synthesis of input signals and output; the first output end is connected with the first input end, the second output end is connected with the second input end, the output impedance of the first output end and the output impedance of the second output end are both less than 50 ohms, the input impedance of the first input end and the input impedance of the second input end are both less than 50 ohms, and the output impedance of the third output end is 50 ohms, so that the overall volume of the power amplifier module is effectively reduced by reducing the output impedance of the first output end and the second output end, the input impedance of the combiner input end is reduced, the volume of the combiner is reduced, the overall volume is reduced, the loss is reduced, and the synthesis efficiency is improved.

[0057] Although preferred embodiments of the application have been described herein, after additional modifications and changes will be made by those skilled in the art once they learn of the basic inventive concepts. Therefore, the appended claims are intended to include within their scope all embodiments that fairly fall within the four corners of the appended claims whenever such modifications or changes can be made to the preferred embodiments of the present application. What is claimed is:

[0058] Obviously, various modifications and changes can be made to the present application by those skilled in the art without departing from the spirit and scope of the present application. Thus, it is intended that the present application encompass such modifications and changes as fall within the scope of the appended claims and their equivalents.

Claims

1. A power amplifier combining device, characterized by comprising: The application relates to a power amplifier output matching circuit. The first power amplifier output matching circuit comprises a first power amplifier pair, a first set of impedance cables and a first output terminal, and the second power amplifier output matching circuit comprises a second power amplifier pair, a second set of impedance cables and a second output terminal. The first set of impedance cables and the second set of impedance cables each comprise a first microstrip line, a second microstrip line, a first coaxial cable, a second coaxial cable, a third microstrip line, a fourth microstrip line, a fifth microstrip line, a sixth microstrip line, a seventh microstrip line, a first capacitor, a second capacitor, a third coaxial cable and an eighth microstrip line. The first microstrip line is connected to the first power amplifier output terminal at one end, the second microstrip line is connected to the second power amplifier output terminal at one end, the other end of the first microstrip line is connected to the outer sheath of the first coaxial cable at one end, the inner core of the first coaxial cable at one end is connected to the other end of the second microstrip line, the other end of the second microstrip line is connected to the outer sheath of the second coaxial cable at one end, the inner core of the second coaxial cable at one end is connected to the other end of the first microstrip line, the other ends of the third microstrip line are respectively connected to the inner cores of the other ends of the first coaxial cable and the second coaxial cable, the outer sheath of the other end of the first coaxial cable is connected to one end of the fourth microstrip line, the outer sheath of the other end of the second coaxial cable is connected to one end of the seventh microstrip line, the other end of the fourth microstrip line is connected to one end of the fifth microstrip line through the first capacitor, the other end of the seventh microstrip line is connected to the sixth microstrip line through the second capacitor, the other end of the fifth microstrip line is connected to the outer sheath of one end of the third coaxial cable, the sixth microstrip line is connected to the inner core of one end of the third coaxial cable, the outer sheath of the other end of the third coaxial cable is grounded, the inner core of the other end of the third coaxial cable is connected to one end of the eighth microstrip line, the other end of the eighth microstrip line is connected to the first input terminal in the first set of impedance cables, and the other end of the eighth microstrip line is connected to the second input terminal in the second set of impedance cables. The first microstrip line is used for increasing the output impedance of the first power amplifier output terminal by a first preset multiple, and the second microstrip line is used for increasing the output impedance of the second power amplifier output terminal by the first preset multiple. The first coaxial cable is used for increasing the output impedance by a second preset multiple, and the second coaxial cable is used for increasing the output impedance by the second preset multiple. The third coaxial cable is used for increasing the output impedance by a third preset multiple, so that the output impedance of the first output terminal and the output impedance of the second output terminal are both less than 50 ohms. The combiner comprises a first input terminal, a second input terminal and a third output terminal, and is used for power synthesis of input signals and output. The first output terminal is connected to the first input terminal, the second output terminal is connected to the second input terminal, the output impedance of the first output terminal and the output impedance of the second output terminal are both less than 50 ohms, the input impedance of the first input terminal and the input impedance of the second input terminal are both less than 50 ohms, and the output impedance of the third output terminal is 50 ohms.

2. The power combining apparatus of claim 1, wherein The characteristic impedance of the first coaxial cable and the characteristic impedance of the second coaxial cable are 12 ohms to 17 ohms. The characteristic impedance of the third coaxial cable is 25-35 ohms.

3. The power combining apparatus of claim 1, wherein The combiner comprises a fourth coaxial cable, a fifth coaxial cable, a ninth microstrip line, a tenth microstrip line, a first isolation resistor, a second isolation resistor and an eleventh microstrip line. The inner core of one end of the fourth coaxial cable is connected to the first input end, the outer skin of one end of the fourth coaxial cable is connected to one end of the first isolation resistor, the other end of the first isolation resistor is connected to one end of the ninth microstrip line, and the other end of the ninth microstrip line is connected to the outer skin of the other end of the fourth coaxial cable and one end of the second isolation resistor. The inner core of one end of the fifth coaxial cable is connected to the second input end, the outer skin of one end of the fifth coaxial cable is connected to the other end of the first isolation resistor, one end of the first isolation resistor is connected to one end of the tenth microstrip line, and the other end of the tenth microstrip line is connected to the outer skin of the other end of the fifth coaxial cable and the other end of the second isolation resistor. The inner core of the other end of the fourth coaxial cable and the inner core of the other end of the fifth coaxial cable are both connected to one end of the eleventh microstrip line, and the other end of the eleventh microstrip line is connected to the third output end.

4. The power combining apparatus of claim 3, wherein The characteristic impedance of the fourth coaxial cable and the characteristic impedance of the fifth coaxial cable are both 12-50 ohms.

5. The power combining apparatus of claim 1, wherein The input impedance of the first input end and the input impedance of the second input end are both 12.5-25 ohms.

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