Passive output matching circuit of linear amplifier with 2GHz bandwidth

Abstract

The invention belongs to the technical field of output impedance matching circuits, and particularly relates to a passive output matching circuit of a linear amplifier with 2GHz bandwidth, which comprises a first circuit structure and a second circuit structure, the first circuit structure comprises two signal circuits, the second circuit structure comprises five metal wires, the five metal wires are parallel to one another, and the two signal circuits are connected with the first circuit structure. Two of the five metal wires are first five metal wires, and the other three metal wires are second metal wires. Aiming at the problem that the bandwidth of a common single-ended output impedance matching circuit is limited, the brand-new single-ended output impedance matching circuit is provided, a conventional capacitor inductor and a metal wiring structure are combined, linear output power under a wider frequency band is achieved, and particularly, under the condition that the insertion loss of the output power is the same, the linear output power can be improved. A common single-ended output impedance matching circuit realizes linear power output of 1GHz bandwidth, while the single-ended output impedance matching circuit can realize linear power output of 2GHz bandwidth.

Description

Technical Field

[0001] The present invention relates to the technical field of output impedance matching circuits, and specifically to a passive output matching circuit for a linear amplifier with a 2GHz bandwidth. Background Art

[0002] The output impedance matching circuit of a single-port amplifier is used to make the output impedance of the amplifier match the load impedance, so as to achieve the purposes of efficient signal transmission and maximum power transmission.

[0003] Currently, the bandwidth of the output impedance matching circuit of a single-port amplifier in 5.8GHz mobile hotspot (WiFi) applications is generally limited within 1GHz, that is, the operating bandwidth is from 5GHz to 6GHz.

[0004] As Figure 3 shown, it is a common output impedance matching circuit of a single-port amplifier. Figure 3 In it, a single-port amplifier outputs a series inductor L1, a capacitor C2, a parallel capacitor C1, and an inductor L2, and finally connects to an antenna. Figure 3 The part within the box in it is a common single-ended output impedance matching circuit. On the one hand, affected by the parasitic parameters of capacitors or inductors, when used in a frequency band width exceeding 1GHz, the linear output power of the amplifier is low at the frequency points at the edge of the frequency band, and it is difficult to achieve a high linear power output in the entire frequency band. On the other hand, the amplifier also has requirements for harmonic suppression. The common output impedance matching circuit needs to add additional capacitor and inductor components to enhance harmonic suppression. Summary of the Invention

[0005] The purpose of the present invention is to provide a passive output matching circuit for a linear amplifier with a 2GHz bandwidth, so as to solve the problems put forward in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A passive output matching circuit for a linear amplifier with a 2GHz bandwidth, comprising:

[0007] Circuit structure one, circuit structure two;

[0008] Among them, the circuit structure one includes two signal circuits, the circuit structure two includes five metal traces, and the five metal traces are parallel to each other. Two of the five metal traces are the first five metal traces, and the other three metal traces are the second metal traces;

[0009] One end of the two first five metal traces is port B, and the other end is port D. One end of the three second metal traces is port A, and the other end is port C;

[0010] Two signal circuits are connected to the output port of the single-port amplifier. The two signal circuits are respectively connected to port A and port B. The port C is connected to the antenna port, and the port D is grounded.

[0011] Preferably, one of the two signal circuits includes an inductor L1 and a capacitor C1, and the other of the two signal circuits includes an inductor L2 and a capacitor C2. The output port of the single-port amplifier is connected to one end of the inductor L1 and one end of the capacitor C2. The other end of the inductor L1 is connected to one end of the capacitor C1 and port A. The other end of the capacitor C2 is connected to one end of the inductor L2 and port B. The other ends of the capacitor C1 and the inductor L2 are grounded.

[0012] Preferably, a capacitor C3 is connected between the two signal circuits.

[0013] Preferably, the shape of the metal trace of Circuit Structure 2 is a straight line, a bent line or an arc.

[0014] Preferably, the phases of the signals at port A and port B differ by 180 degrees.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] In view of the problem of limited bandwidth of the common single-ended output impedance matching circuit, the present invention proposes a novel single-ended output impedance matching circuit, which combines conventional capacitors, inductors and metal trace structures to achieve linear output power in a wider frequency band. Specifically, when the insertion loss of the output power is the same, the ordinary single-ended output impedance matching circuit achieves linear power output with a bandwidth of 1 GHz (from 5 GHz to 6 GHz), while the present invention can achieve linear power output with a bandwidth of 2 GHz (from 5 GHz to 7 GHz).

[0017] A novel single-port output impedance matching circuit is proposed for 5.8 GHz mobile hotspot (WiFi) applications. Its operating bandwidth is increased by about one time compared with the common single-port output impedance matching circuit, widened from 1 GHz bandwidth to 2 GHz bandwidth, and the harmonic suppression is improved at the same time.

[0018] The present invention provides a novel single-port output impedance matching circuit with higher bandwidth and better harmonic suppression for 5.8 GHz mobile hotspot (WiFi) applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the single-ended output impedance matching circuit diagram of the present invention;

[0020] Figure 2 It is the second single-ended output impedance matching circuit diagram of the present invention;

[0021] Figure 3 It is a circuit diagram for impedance matching of the output of an existing single-port amplifier. Specific implementation manners

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0024] Embodiment 1:

[0025] Please refer to Figure 1-2 , the present invention provides a technical solution: a passive output matching circuit for a 2GHz bandwidth linear amplifier, including:

[0026] Circuit structure 1 and circuit structure 2;

[0027] Among them, the circuit structure 1 includes two signal circuits, the circuit structure 2 includes five metal traces, and the five metal traces are parallel to each other. Two of the five metal traces are the first five metal traces, and the other three metal traces are the second metal traces; one end of the two first five metal traces is port B, and the other end is port D. One end of the three second metal traces is port A, and the other end is port C; the two signal circuits are connected to the output port of the single-port amplifier, the two signal circuits are respectively connected to port A and port B, the port C is connected to the antenna port, and the port D is grounded.

[0028] One of the two signal circuits includes an inductor L1 and a capacitor C1, and the other of the two signal circuits includes an inductor L2 and a capacitor C2. The output port of the single-port amplifier is connected to one end of the inductor L1 and one end of the capacitor C2. The other end of the inductor L1 is connected to one end of the capacitor C1 and port A. The other end of the capacitor C2 is connected to one end of the inductor L2 and port B. The other ends of the capacitor C1 and the inductor L2 are grounded. The phases of the signals at port A and port B differ by 180 degrees.

[0029] Analysis of the above content: Circuit structure 1 consists of two sets of circuits connected to the output port of a single-ended linear amplifier. One set is a series capacitor and a parallel inductor, and the other set is a series inductor and a parallel capacitor. Through circuit structure 1, the output signal of the single-ended linear amplifier can be split into two output signals, which go to port A and port B respectively. Circuit structure 1 has two functions: ① Split the single-ended output signal into two signals. By adjusting the sizes of the capacitor and inductor, the required operating frequency can be adjusted, and the phases of the signals at port A and port B can be made to differ by 180 degrees; ② By adjusting the sizes of the capacitor and inductor, the second harmonic of the output signal can be suppressed.

[0030] Circuit structure 2 consists of parallel metal traces connected to port A and port B respectively. Port A is connected to three of these metal traces, and the other ends of these three metal traces, that is, port C, are directly connected to the antenna port. Port B is connected to two other metal traces, and the other ends of these two metal traces, that is, port D, are connected to ground. Circuit structure 2 has two functions: ① Superimpose the two signals from port A and port B and output them to the antenna. By adjusting the lengths of the metal traces, the operating frequency can be adjusted; ② Suppress out-of-band signals.

[0031] The shapes of the metal traces of circuit structure 2 can be various, such as straight lines, bent lines, or arcs. It only needs to maintain a certain length according to the required frequency and power. The number of traces on port A and port B can also be reduced or increased. It only needs to ensure that the lines between port A and port B are pairwise parallel, and adjacent parallel metal traces must come from different ports of port A and port B respectively. The specific number of traces can be adjusted according to the target power and the characteristics of the amplifier.

[0032] Embodiment 2:

[0033] Please refer to Figure 1-2 , and the present invention provides a technical solution based on Embodiment 1: A capacitor C3 is connected between the two signal circuits.

[0034] Analysis of the above content: By adding capacitor C3, on the basis of Figure 1 the first structure, a capacitor C3 is added between port A and port B. By adjusting the capacitance value of this capacitor, the output power can be increased on the basis of the first structure, and at the same time, the gain of the output signal can be adjusted.

[0035] Embodiment 3:

[0036] Please refer to Figure 1-2 , and the present invention provides a technical solution based on Embodiment 1: The shapes of the metal traces of circuit structure 2 are straight lines, bent lines, arcs, etc.

[0037] Analysis of the above content: It only needs to maintain a certain length according to the required frequency and power. The number of traces on Port A and Port B can also be reduced or increased. It only needs to ensure that the lines between Port A and Port B are pairwise parallel, and the adjacent two parallel metal traces must come from different ports of Port A and Port B respectively. The specific number of traces can be adjusted according to the target power and the characteristics of the amplifier.

[0038] The foregoing has shown and described the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any reference signs in the claims should not be regarded as limiting the claims involved.

[0039] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A passive output matching circuit for a linear amplifier with a 2 GHz bandwidth, characterized in that, Comprising: Circuit structure one and circuit structure two; Among them, the circuit structure one includes two signal circuits, and the circuit structure two includes five metal traces, and the five metal traces are parallel to each other. Two of the five metal traces are the first five metal traces, and the other three metal traces are the second metal traces; One end of the two first five metal traces is port B, and the other end is port D. One end of the three second metal traces is port A, and the other end is port C; The two signal circuits are connected to the output port of the single-port amplifier. The two signal circuits are respectively connected to port A and port B. The port C is connected to the antenna port, and the port D is grounded.

2. The passive output matching circuit of a 2GHz bandwidth linear amplifier according to claim 1, characterized in that: One of the two signal circuits includes an inductor L1 and a capacitor C1, and the other signal circuit of the two signal circuits includes an inductor L2 and a capacitor C2. The output port of the single-port amplifier is connected to one end of the inductor L1 and one end of the capacitor C2. The other end of the inductor L1 is connected to one end of the capacitor C1 and port A. The other end of the capacitor C2 is connected to one end of the inductor L2 and port B. The other ends of the capacitor C1 and the inductor L2 are grounded.

3. The passive output matching circuit of a 2GHz bandwidth linear amplifier according to claim 1, characterized in that: A capacitor C3 is connected between the two signal circuits.

4. The passive output matching circuit of a 2GHz bandwidth linear amplifier according to claim 1, characterized in that: The shape of the metal traces of the circuit structure two is a straight line, a bent line or an arc.

5. The passive output matching circuit of a 2GHz bandwidth linear amplifier according to claim 1, characterized in that: The phases of the signals at port A and port B differ by 180 degrees.

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