High-efficiency monolithic integrated balanced power amplifier

Abstract

The invention discloses a high-efficiency monolithic integrated balanced power amplifier, relates to the field of amplifiers, and aims to solve the problems that a coupling line used by an existing low-frequency lane bridge is relatively long and often exceeds the size of a power amplifier chip, the lane bridge can be integrated on a chip only after being coiled, and relatively high line loss is brought by the relatively long coupling line, so that the loss of the low-frequency lane bridge is relatively large, and the cost is relatively high. According to the technical scheme, the balance type power amplifier solves the problems that on one hand, the output power of the amplifier is reduced, on the other hand, the power capacity of a lange bridge is also limited, and the thickness of a monolithic integrated balance type power amplifier chip is determined by the technology and cannot be increased at will. The balance type power amplifier comprises a low-loss lange bridge circuit and a power amplifier sub-circuit; the number of the low-loss lange bridge circuits is two, the number of the power amplifier sub-circuits is two, the number of the low-loss lange bridge circuits is two, the number of the power amplifier sub-circuits is two, the low-loss lange bridge comprises parallel coupling lines, a load resistor and a capacitor, the number of the parallel coupling lines is two, each of the two parallel coupling lines is formed by arranging two or four coupling lines in parallel, and two adjacent ports of the two parallel coupling lines are connected in a pairwise crossing mode.

Description

Technical Field

[0001] The invention relates to the technical field of amplifiers, and in particular to a high-efficiency monolithic integrated balanced power amplifier. Background Art

[0002] Balanced power amplifiers use an isolated bridge to achieve power division and combining functions, so they have good input and output standing waves and stability. They are widely used in RF and microwave circuits, especially in situations where high power and high stability are required. For example, in satellite communications, radar systems, wireless communication base stations and other fields, monolithic integrated balanced power amplifiers play an important role.

[0003] Monolithic integrated balanced power amplifiers usually use Lange bridges as power distribution and combining devices to achieve orthogonal 3dB power amplification or combining. Lange couplers are composed of two sections of coupling lines, each section of which is composed of multiple coupling lines that are parallel to each other and closely arranged. The length of the coupling line corresponds to one-quarter wavelength of the working center frequency. Compared with other orthogonal couplers, such as branch line couplers, Lange bridge circuits are smaller in size and are therefore suitable for use in monolithic integrated circuits.

[0004] However, the device and the prior art still have the following defects:

[0005] The coupling lines used in low-frequency lange bridges are longer, often exceeding the size of the power amplifier chip. The lange bridge needs to be coiled to be integrated on the chip. The longer coupling lines bring higher line losses, so the low-frequency lange bridge has greater losses, reducing the output power of the amplifier. On the other hand, it also limits the power capacity of the lange bridge. Discrete lange bridge devices usually increase the substrate thickness to increase the line width of the coupling lines, thereby reducing line losses. The thickness of the monolithic integrated balanced power amplifier chip is determined by the process and cannot be thickened arbitrarily. Summary of the invention

[0006] The object of the present invention is to provide a high-efficiency monolithic integrated balanced power amplifier.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A high-efficiency monolithic integrated balanced power amplifier comprises a low-loss Lange bridge circuit and a power amplifier sub-circuit, wherein two of the low-loss Lange bridge circuit and the power amplifier sub-circuit are provided, wherein the low-loss Lange bridge comprises a parallel coupling line, a load resistor and a capacitor, wherein the parallel coupling line has two sections, wherein the two parallel coupling lines are each composed of two or four coupling lines arranged in parallel, and wherein two adjacent ports of the two parallel coupling lines are cross-connected in pairs.

[0009] By adopting the above technical scheme, a two-line parallel low-loss Lange bridge circuit is composed of parallel coupling lines, load resistors, parallel capacitors, and parallel coupling lines include transmission lines, and the parallel coupling lines include transmission lines, and one end of the transmission lines,,, is used as four ports of the Lange bridge, and the four ports are respectively a coupling port, an input / output port, a through port, and an isolation port. The other ends of the transmission lines are connected to each other, and the other ends of the transmission lines are connected to each other to form a complete Lange bridge. The isolation port of the low-loss Lange bridge circuit is connected to the load resistor, and two parallel-to-ground capacitors and a line-to-line parallel capacitor are loaded at the coupling lines and the cross-interconnection nodes to form a capacitor-loaded low-loss Lange bridge; the four-line parallel low-loss Lange bridge circuit is composed of cross-finger parallel The coupling lines are composed of load resistors, parallel capacitors, and the interdigital parallel coupling lines include transmission lines,,, and two groups of transmission lines and, and are interconnected at both ends to form an interdigital parallel coupling line. The parallel coupling lines include transmission lines,,, and two groups of transmission lines and, and are interconnected at both ends to form an interdigital parallel coupling line. Two adjacent ports of the interdigital parallel coupling lines and two adjacent ports of the interdigital parallel coupling lines are cross-interconnected in pairs to form a lange bridge. The remaining four ports of the interdigital parallel coupling lines and serve as coupling ports, input / output ports, through ports and isolation ports of the lange bridge. The isolation port of the low-loss lange bridge circuit is connected to a load resistor, and two parallel-to-ground capacitors and one line-to-line parallel capacitor are loaded at the coupling lines and the cross-interconnection nodes to form a capacitor-loaded low-loss lange bridge.

[0010] Furthermore, the other four ports of the two parallel coupled lines are respectively used as a coupling port of the lange bridge, an input / output port of the lange bridge, a through port of the lange bridge and an isolation port of the lange bridge.

[0011] By adopting the above technical solution, the coupling port of the lange bridge, the input / output port of the lange bridge, the through port of the lange bridge and the isolation port of the lange bridge can be externally connected to corresponding devices.

[0012] Furthermore, the load resistor is connected to the lange bridge isolation port.

[0013] By adopting the above technical solution, the load resistance is ohms, and the load resistance is used to achieve matching between the signal source and the load. By selecting an appropriate load resistance, the impedance between the signal source and the load can be matched, thereby minimizing the signal transmission loss and improving the performance and stability of the system.

[0014] Furthermore, three capacitors are provided, and the cross-interconnection nodes of two coupling lines are loaded with two parallel-connected ground capacitors and one line-to-line parallel capacitor.

[0015] By adopting the above technical solution, a capacitor connected in parallel to the ground and a parallel capacitor between the lines are loaded at the cross interconnection of the two coupling lines. Under the premise of not changing the operating frequency, the length of the coupling lines constituting the Lange bridge is shortened, the coupling degree reduced due to the reduction of the coupling line length is compensated, the coupling degree between the coupling lines is improved, and the transmission loss is reduced, thereby improving the amplifier efficiency.

[0016] In summary, the beneficial technical effects of the present invention are:

[0017] 1. The present invention adopts a low-loss Lange bridge design to significantly reduce the energy loss of the signal during transmission. By loading a capacitor connected in parallel to the ground on the coupling line, the length of the coupling line is shortened without changing the operating frequency, thereby reducing the transmission loss of the Lange bridge and improving the overall efficiency of the power amplifier.

[0018] 2. The present invention increases the coupling degree between the coupling lines by loading parallel capacitors between the coupling lines, thereby compensating for the coupling degree reduced due to the reduction in the length of the coupling lines. Therefore, there is no need to increase the coupling degree by reducing the line width at the expense of power capacity. Therefore, the capacitor-loaded Lange bridge has the advantages of low loss, low amplitude-phase imbalance and high power capacity, which is conducive to realizing a high-power, high-efficiency balanced power amplifier. The capacitor-loaded Lange bridge has a small size and is easy to integrate in a monolithic circuit, and is particularly suitable for realizing a monolithic integrated balanced power amplifier in a low-frequency band. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification, but do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 It is a principle block diagram of the amplifier of the present invention;

[0021] Figure 2 It is the classic lange bridge circuit topology without loading capacitor of the present invention;

[0022] Figure 3 The present invention is a circuit topology of a balanced power amplifier using a capacitor-loaded two-wire parallel low-loss Lange bridge;

[0023] Figure 4 Another circuit topology of the balanced power amplifier of the present invention using a capacitor-loaded four-wire parallel low-loss Lange bridge;

[0024] Figure 5 It is a circuit layout example of a Lange bridge composed of four parallel coupled lines of the present invention;

[0025] Figure 6It is a circuit layout example of a lange bridge composed of two parallel coupled lines of the present invention. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1-6 The present invention provides a technical solution: a high-efficiency monolithic integrated balanced power amplifier, comprising two identical low-loss Lange bridge circuits 1, 2 and two power amplifier sub-circuits 3, 4; the low-loss Lange bridge circuits 1, 2 have a low-loss Lange bridge composed of two parallel coupled lines and a low-loss Lange bridge composed of four parallel coupled lines.

[0029] See also Figure 2 and Figure 3 The two-line parallel low-loss Lange bridge circuit 1 is composed of parallel coupled lines 11, 12, a load resistor 13, and parallel capacitors 14, 15, and 16. The parallel coupled line 11 includes transmission lines 111 and 112, and the parallel coupled line 12 includes transmission lines 121 and 122. One end of the transmission lines 111, 112, 121, and 122 is used as four ports of the Lange bridge, and the four ports are respectively a coupling port, an input / output port, a through port, and an isolation port. The other ends of the transmission line 111 and the transmission line 122 are connected to each other, and the other ends of the transmission line 112 and the transmission line 121 are connected to each other, forming a complete la The isolation port of the low-loss Lange bridge circuit 1 is connected to a load resistor 13, and two capacitors 14 and 15 connected in parallel to the ground and a parallel capacitor 16 between the lines are loaded at the cross-interconnection node of the coupling lines 11 and 12, forming a capacitor-loaded low-loss Lange bridge. By loading capacitors 14 and 15 connected in parallel to the ground and a parallel capacitor 16 between the lines at the cross-interconnection of the coupling lines 11 and 12, the length of the coupling lines constituting the Lange bridge is shortened without changing the operating frequency, thereby compensating for the reduced coupling degree due to the reduction in the length of the coupling lines, improving the coupling degree between the coupling lines, and thus reducing the transmission loss and improving the amplifier efficiency.

[0030] See also Figure 2 and Figure 3The two-line parallel low-loss Lange bridge circuit 2 is composed of parallel coupling lines 21, 22, a load resistor 23, and parallel capacitors 24, 25, and 26. The parallel coupling line 21 includes transmission lines 211 and 212, and the parallel coupling line 22 includes transmission lines 221 and 222. One end of the transmission lines 211, 212, 221, and 222 is used as the four ports of the Lange bridge, and the four ports are respectively a coupling port, an input / output port, a through port, and an isolation port. The other ends of the transmission line 211 and the transmission line 222 are connected to each other, and the other ends of the transmission line 212 and the transmission line 221 are connected to each other, forming a complete la The isolation port of the low-loss Lange bridge circuit 2 is connected to a load resistor 23, and two capacitors 24 and 25 connected in parallel to the ground and a parallel capacitor 26 between the lines are loaded at the cross-interconnection node of the coupling lines 21 and 22, forming a capacitor-loaded low-loss Lange bridge. By loading capacitors 24 and 25 connected in parallel to the ground and a parallel capacitor 26 between the lines at the cross-interconnection of the coupling lines 21 and 22, the length of the coupling lines constituting the Lange bridge is shortened without changing the operating frequency, thereby compensating for the reduced coupling degree due to the reduction in the length of the coupling lines, improving the coupling degree between the coupling lines, and thereby reducing the transmission loss and improving the amplifier efficiency.

[0031] See also Figure 2 and Figure 4 The four-line parallel low-loss Lange bridge circuit 1 is composed of interdigital parallel coupling lines 11, 12, a load resistor 13, and parallel capacitors 14, 15, and 16. The interdigital parallel coupling line 11 includes transmission lines 111, 112, 113, and 114, and two groups of transmission lines 111 and 113, 112, and 114 are interconnected at both ends to form the interdigital parallel coupling line 11. The parallel coupling line 12 includes transmission lines 121, 122, 123, and 124, and two groups of transmission lines 121 and 123, 122, and 124 are interconnected at both ends to form the interdigital parallel coupling line 12. Two adjacent ports of the interdigital parallel coupling line 11 and two adjacent ports of the interdigital parallel coupling line 12 are cross-connected to form a Lange bridge. The remaining four ports of 11 and 12 serve as the coupling port, input / output port, through port and isolation port of the Lange bridge. The isolation port of the low-loss Lange bridge circuit 1 is connected to the load resistor 13. Two capacitors 14 and 15 connected in parallel to the ground and one parallel capacitor 16 between the lines are loaded at the cross-interconnection node of the coupling lines 11 and 12, forming a capacitor-loaded low-loss Lange bridge. By loading capacitors 14 and 15 connected in parallel to the ground and one parallel capacitor 16 between the lines at the cross-interconnection of the coupling lines 11 and 12, the length of the coupling lines constituting the Lange bridge is shortened without changing the operating frequency, thereby compensating for the reduced coupling degree due to the reduction in the length of the coupling lines, improving the coupling degree between the coupling lines, and thereby reducing the transmission loss and improving the amplifier efficiency.

[0032] See also Figure 2 and Figure 4 The four-line parallel low-loss Lange bridge circuit 2 is composed of interdigital parallel coupling lines 21, 22, a load resistor 23, and parallel capacitors 24, 25, and 26. The interdigital parallel coupling line 21 includes transmission lines 211, 212, 213, and 214, and two groups of transmission lines 211 and 213, 212 and 214 are interconnected at both ends to form the interdigital parallel coupling line 21. The parallel coupling line 22 includes transmission lines 221, 222, 223, and 224, and two groups of transmission lines 221 and 223, 222 and 224 are interconnected at both ends to form the interdigital parallel coupling line 22. Two adjacent ports of the interdigital parallel coupling line 21 and two adjacent ports of the interdigital parallel coupling line 22 are cross-connected to form a Lange bridge. The remaining four ports of 21 and 22 serve as the coupling port, input / output port, through port and isolation port of the Lange bridge. The isolation port of the low-loss Lange bridge circuit 2 is connected to the load resistor 23. Two capacitors 24 and 25 connected in parallel to the ground and one parallel capacitor 26 between the lines are loaded at the cross-interconnection node of the coupling lines 21 and 22, forming a capacitor-loaded low-loss Lange bridge. By loading capacitors 24 and 25 connected in parallel to the ground and one parallel capacitor 26 between the lines at the cross-interconnection of the coupling lines 21 and 22, the length of the coupling lines constituting the Lange bridge is shortened without changing the operating frequency, thereby compensating for the reduced coupling degree due to the reduction in the length of the coupling lines, improving the coupling degree between the coupling lines, and thereby reducing the transmission loss and improving the amplifier efficiency.

[0033] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high efficiency monolithic integrated balanced power amplifier, comprising a low loss Lange bridge circuit and a power amplifier sub-circuit, characterized in that: The low-loss Lange bridge circuit and the power amplifier sub-circuit are each provided with two, the low-loss Lange bridge comprises a parallel coupling line, a load resistor and a capacitor, the parallel coupling line is provided with two sections, the two parallel coupling lines are each composed of two or four coupling lines arranged in parallel, and the two adjacent ports of the two parallel coupling lines are cross-interconnected in pairs.

2. The high-efficiency monolithic integrated balanced power amplifier according to claim 1, characterized in that: The other four ports of the two parallel coupled lines are respectively used as a coupling port of the lange bridge, an input / output port of the lange bridge, a through port of the lange bridge and an isolation port of the lange bridge.

3. The high-efficiency monolithic integrated balanced power amplifier according to claim 1, characterized in that: The load resistor is connected to the lange bridge isolation port.

4. The high-efficiency monolithic integrated balanced power amplifier according to claim 1, characterized in that: The capacitors are provided with three, and the cross-interconnection nodes of the two coupling lines are loaded with two parallel-to-ground capacitors and one parallel capacitor between the lines.

Images