A passive output matching circuit for a linear amplifier with a 2 GHz bandwidth

Abstract

The application belongs to the technical field of output impedance matching circuit, and specifically relates to a passive output matching circuit of a 2GHz bandwidth linear amplifier, which comprises circuit structure one and circuit structure two. The circuit structure one comprises two signal circuits, the circuit structure two comprises five metal wires, the five metal wires are parallel to each other, two of the five metal wires are first five metal wires, and the other three metal wires are second metal wires. The application proposes a novel single-ended output impedance matching circuit aiming at the problem that the bandwidth of a common single-ended output impedance matching circuit is limited, and realizes linear output power under a wider frequency band by combining conventional capacitors, inductors and metal wire structures. Specifically, under the condition that the insertion loss of output power is the same, the common single-ended output impedance matching circuit realizes linear power output of 1GHz bandwidth, and the application can realize linear power output of 2GHz bandwidth.

Description

Technical Field

[0001] This invention relates to the field of output impedance matching circuit technology, specifically a passive output matching circuit for a 2GHz bandwidth linear amplifier. Background Technology

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

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

[0004] like Figure 3 The image shows a common output impedance matching circuit for a single-port amplifier. Figure 3 In the process, the output of the single-port amplifier is connected in series with inductor L1 and capacitor C2, in parallel with capacitor C1 and inductor L2, and finally connected to the antenna. Figure 3 The section within the square box is a common single-ended output impedance matching circuit. On one hand, due to the parasitic parameters of capacitors or inductors, when used in bandwidths exceeding 1 GHz, the amplifier's linear output power is low at the frequency edges of the band, making it difficult to achieve high linear power output across the entire frequency range. On the other hand, amplifiers also have requirements for harmonic suppression; common output impedance matching circuits require additional capacitors and inductors to enhance harmonic suppression. Summary of the Invention

[0005] The purpose of this invention is to provide a passive output matching circuit for a 2GHz bandwidth linear amplifier to solve the problems mentioned in the background art.

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

[0007] Circuit Structure 1; Circuit Structure 2;

[0008] The circuit structure one includes two signal circuits, and the circuit structure two includes five metal traces, which 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-way signal circuit is connected with the output port of single-port amplifier, two-way signal circuit is connected with port A and port B respectively, port C is connected with antenna port, and port D is grounded.

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

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

[0013] Preferably, the shape of the metal trace of the circuit structure two is a straight line, a bent line or an arc line.

[0014] Preferably, the phase of the signal at the port A and the phase of the signal at the port B are 180 degrees different.

[0015] Compared with the prior art, the present application has the following beneficial effects:

[0016] The present application proposes a novel single-port output impedance matching circuit to solve the problem of limited bandwidth of common single-port output impedance matching circuit, and combines conventional capacitors, inductors and metal trace structure to realize linear output power in a wider frequency band, specifically, when the insertion loss of output power is the same, the common single-port output impedance matching circuit realizes linear power output in 1GHz bandwidth (5GHz to 6GHz), while the present application realizes linear power output in 2GHz bandwidth (5GHz to 7GHz).

[0017] The present application proposes a novel single-port output impedance matching circuit in 5.8GHz mobile hotspot (WiFi) application, which has a doubled working bandwidth compared with common single-port output impedance matching circuit, i.e., from 1GHz bandwidth to 2GHz bandwidth, and improves harmonic suppression.

[0018] The present application provides a novel single-port output impedance matching circuit, which has higher bandwidth and better harmonic suppression in 5.8GHz mobile hotspot (WiFi) application. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The figure is a single-port output impedance matching circuit of the present application;

[0020] Figure 2 The figure is a second single-port output impedance matching circuit of the present application;

[0021] Figure 3 Circuit diagram for matching the output impedance of the existing single-port amplifier. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0023] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0024] Embodiment one:

[0025] Please refer to Figures 1-2 The present application provides a technical solution: a passive output matching circuit of a 2GHz bandwidth linear amplifier, comprising:

[0026] Circuit structure one, circuit structure two;

[0027] The circuit structure one includes two signal circuits, the circuit structure two includes five metal wires, and the five metal wires are parallel to each other, two of the five metal wires are first five metal wires, and the other three metal wires are second metal wires; one end of the two first five metal wires is port B, and the other end is port D; one end of the three second metal wires 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, and the two signal circuits are connected to port A and port B respectively; 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 end of the capacitor C1 and the other end of the inductor L2 are grounded. The phase of the signal at port A and the phase of the signal at port B are 180 degrees apart.

[0029] The above content analysis: circuit structure one is connected to the output port of the single-ended linear amplifier respectively two groups of circuits, one group of series capacitor and parallel inductor and a group of series inductor and parallel capacitor, through the circuit structure one can split the output signal of single-ended linear amplifier into two output signals, respectively to port A and port B, the role of circuit structure one has two: ① the output signal of single-ended is divided into two signals, by adjusting the size of the capacitor and inductor can adjust the demand of working frequency, and let the signal of port A and the signal of port B phase difference 180 degrees; ② by adjusting the size of the capacitor and inductor can suppress the second harmonic of output signal.

[0030] Circuit structure two is respectively connected to the parallel metal lines of port A and port B, port A connects three metal lines, the other end of the three metal lines, that is, port C is directly connected with the antenna port, port B connects the other two metal lines, the other end of the two metal lines, that is, port D is connected to the ground, the role of circuit structure two has two: ① the two signals of port A and port B are superimposed together and output to the antenna, the length of the metal line can be adjusted to adjust the working frequency; ② suppress the out-of-band signal

[0031] The shape of the metal line of circuit structure two can be various, straight line, bending line and arc line can be used, only the length needs to be kept according to the demand frequency and demand power, the number of lines on port A and port B can also be reduced or increased, only the lines between port A and port B are parallel, and the adjacent two parallel metal lines must come from different ports of port A and port B respectively, the specific number of lines can be adjusted according to the target power and the characteristics of the amplifier.

[0032] Example two:

[0033] Please refer to Figures 1-2 , the application based on example one provides a technical solution: the connection capacitor C3 between two signal circuits.

[0034] The above content analysis: increase the capacitor C3, Figure 1 On the basis of the first structure, a capacitor C3 is added between port A and port B, by adjusting the capacitance value, the output power can be improved on the basis of the first structure, and the gain of the output signal can be adjusted.

[0035] Example three:

[0036] Please refer to Figures 1-2 , the application based on example one provides a technical solution: the shape of the metal line of circuit structure two is straight line, bending line or arc line.

[0037] The above analysis: only need to keep a certain length according to the demand frequency and demand power, the number of lines on port A and port B can be reduced or increased, only need to keep the line between port A and port B is two parallel, and the adjacent two parallel metal lines must be from port A and port B in different ports, respectively, the number of lines according to the target power and the characteristics of the amplifier can be adjusted.

[0038] The above shows and describes the basic principles and main features of the present application and the advantages of the present application, for those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or essential characteristics of the present application; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application, no figure reference in the claims should be regarded as limiting the claims involved.

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

Claims

1. A passive output matching circuit for a linear amplifier having a bandwidth of 2 GHz, characterized by, The application relates to a circuit structure and a single-port amplifier. The circuit structure one comprises two signal circuits, and the circuit structure two comprises five metal lines which are parallel to each other, two of the five metal lines are first five metal lines, and the other three metal lines are second metal lines. One end of the two first five metal lines is a port B, and the other end is a port D; one end of the three second metal lines is a port A, and the other end is a port C. The two signal circuits are connected with an output port of the single-port amplifier, and the two signal circuits are connected with the port A and the port B respectively; the port C is connected with an antenna port; and the port D is grounded. One of the two signal circuits comprises an inductor L1 and a capacitor C1, and the other of the two signal circuits comprises an inductor L2 and a capacitor C2; the output port of the single-port amplifier is connected with one end of the inductor L1 and one end of the capacitor C2; the other end of the inductor L1 is connected with one end of the capacitor C1 and the port A; the other end of the capacitor C2 is connected with one end of the inductor L2 and the port B; and the other end of the capacitor C1 and the other end of the inductor L2 are grounded. The capacitor C3 is connected between the two signal circuits.

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

3. The passive output matching circuit of a linear amplifier with 2 GHz bandwidth according to claim 1, characterized in that: The phase of the signal at the port A and the phase of the signal at the port B are 180 degrees different.

4. The passive output matching circuit of a linear amplifier with 2 GHz bandwidth according to claim 1, characterized in that: ​

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