A reconfigurable hybrid continuous class F ultra-wideband power amplifier spanning four times the frequency

Abstract

The invention discloses a reconfigurable hybrid continuous class F ultra-wideband power amplifier spanning four times the frequency, comprising an input port, a reconfigurable input matching circuit, a PIN switch, a bias circuit, a single-pole double-throw switch, a 2.4-4GHz output matching circuit, a 0.9-2.5GHz output matching circuit, and an output port connected in sequence. The invention combines the advantages of reconfigurable technology and hybrid continuous theory, gives full play to the advantages of multi-mode multi-band power amplifiers, and cross-combines two dispersed frequency bands using a single-pole double-throw switch. On the one hand, the power amplifier has good efficiency performance and can effectively broaden its working bandwidth. On the other hand, it eliminates the influence of the harmonic suppression structure, gives full play to the advantages of multi-mode multi-band power amplifiers, expands the space of optimal impedance solutions for abundant fundamental waves and harmonics, avoids the limitation of harmonic open circuit and short circuit when designing traditional broadband power amplifiers, and has stronger freedom in design. At the same time, it has the characteristics of ultra-wideband, high efficiency, high flexibility, and small size.

Description

Technical Field

[0001] The invention belongs to the technical field of wireless communication, and in particular relates to a reconfigurable hybrid continuous class F ultra-wideband power amplifier spanning four times the frequency. Background Art

[0002] In today's society, wireless communication has built a bridge of communication between people. The explosive demand for wireless communication services has brought opportunities for development and change to wireless communication technology. As one of the core components of wireless communication systems, power amplifiers have also been put forward higher requirements. With the surge in data volume, power amplifiers must expand bandwidth to support the surge in data transmission rate and information volume. The technology of expanding power amplifier bandwidth has always been a difficult point and hot spot in industry research. In addition, "energy conservation and emission reduction, green communication" has always been a major demand and standard in the design of communication systems. Since the power consumption of power amplifiers accounts for more than 90% of the overall power consumption of communication systems, improving the efficiency of power amplifiers is of great significance to reducing operating costs, achieving "green communication" and extending equipment life.

[0003] The power amplifier theory of continuous working mode overturns the traditional theory of the sole matching between impedance points. It reduces the harshness of impedance matching by introducing a control parameter to achieve matching between impedance spaces, and becomes an effective method for power amplifiers to broaden their bandwidth. Based on the continuous theory, scholars in the industry have upgraded it to a hybrid continuous power amplifier theory that transforms the matching space through three control parameters. Compared with the continuous power amplifier theory, it has a wider impedance matching space and can achieve more superior bandwidth performance. Summary of the invention

[0004] Based on the above deficiencies in the prior art, the technical problem solved by the present invention is to provide a reconfigurable hybrid continuous class F ultra-wideband power amplifier spanning four times the frequency, which can avoid the contradiction between the second harmonic and third harmonic short-circuit and open-circuit of traditional harmonic suppression power amplifiers and the working bandwidth, and expand the optimal fundamental impedance point into an impedance solution space, so that the purely resistive fundamental impedance and harmonic impedance are no longer the only solution, but the collection space of solutions within a certain area, thereby greatly broadening the working frequency band of the power amplifier.

[0005] In order to solve the above technical problems, the present invention is implemented by the following technical solutions:

[0006] The invention provides a reconfigurable hybrid continuous class F ultra-wideband power amplifier spanning four times the frequency, comprising an input port, a reconfigurable input matching circuit, a PIN switch, a bias circuit, a single-pole double-throw switch, a 2.4-4GHz output matching circuit, a 0.9-2.5GHz output matching circuit, and an output port connected in sequence.

[0007] Optionally, the reconfigurable input matching circuit includes a microstrip transmission line.

[0008] Optionally, the 2.4-4 GHz output matching circuit and the 0.9-2.5 GHz output matching circuit are connected to the transistor via a single-pole double-throw switch.

[0009] As described above, the present invention combines the advantages of reconfigurable technology and hybrid continuous theory, giving full play to the advantages of multi-mode multi-band power amplifiers, and using a single-pole double-throw switch to cross-combine two dispersed frequency bands. On the one hand, the power amplifier has good efficiency performance and can effectively broaden its working bandwidth. On the other hand, it eliminates the influence of the harmonic suppression structure and gives full play to the advantages of multi-mode multi-band power amplifiers. The space of the optimal impedance solution of the rich fundamental wave and harmonic wave is expanded, avoiding the limitation of the need for harmonic open circuit and short circuit when designing traditional broadband power amplifiers, so that the design has a stronger degree of freedom, and at the same time has the characteristics of ultra-wideband, high efficiency, high flexibility, and small size.

[0010] The present invention adopts reconfigurable technology to cross-integrate two discrete frequency bands and control them through switches, so that the power amplifier has a working bandwidth that spans four times the frequency. In addition, according to the design principle of the hybrid continuous power amplifier, the space of the optimal impedance solution of the rich fundamental and harmonic waves is expanded, avoiding the limitation of the need for harmonic open circuit and short circuit when designing traditional broadband power amplifiers, so that the design has a stronger degree of freedom, so that this power amplifier has the characteristics of ultra-wideband, high efficiency, high flexibility, and small size; the power amplifier structure of the present invention can achieve high-efficiency operation with PAE>72% in the frequency band of 0.9~4GHz, and the in-band gain>12dB, which can meet the surging data transmission rate and information volume in the 5G era, and is of great significance to the goal of achieving "energy saving and emission reduction, green communication".

[0011] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following is a detailed description in combination with the preferred embodiments and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0013] Figure 1 It is an overall circuit diagram of the reconfigurable hybrid continuous class F ultra-wideband power amplifier across four times the frequency of the present invention.

[0014] Figure 2 This is the 0.9~2.5GHz output matching circuit diagram.

[0015] Figure 3 This is the 2.4~4GHz output matching circuit diagram.

[0016] Figure 4 Diagram of the reconfigurable input matching circuit.

[0017] Figure 5 This is the circuit diagram of the PIN switch.

[0018] Figure 6 This is the circuit diagram of a single-pole double-throw switch.

[0019] Figure 7 This is the power amplifier layout.

[0020] Figure 8 It is the gain performance simulation curve diagram.

[0021] Fig. 9 This is the PAE performance simulation curve.

[0022] Fig.10 This is the measured gain performance curve.

[0023] Fig.11 This is the measured curve of PAE performance.

[0024] In the figure: 1. Input port; 2. Reconfigurable input matching circuit; 3. PIN switch; 4. Bias circuit; 5. Single-pole double-throw switch; 6. 2.4~4GHz output matching circuit; 7. 0.9~2.5GHz output matching circuit; 8. Output port. DETAILED DESCRIPTION

[0025] The following is a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings, which is a part of this specification and illustrates the principles of the present invention through examples. Other aspects, features and advantages of the present invention will become clear from the detailed description. In the referenced drawings, the same or similar components in different figures are represented by the same reference numerals.

[0026] like Figures 1 to 11 As shown, the reconfigurable hybrid continuous class F ultra-wideband power amplifier across four times the frequency of the present invention comprises an input port 1, a reconfigurable input matching circuit 2, a PIN switch 3, a bias circuit 4, a single-pole double-throw switch 5, a 2.4-4 GHz output matching circuit 6, a 0.9-2.5 GHz output matching circuit 7, and an output port 8. Among them, the input port 1, the reconfigurable input matching circuit 2, the PIN switch 3, the bias circuit 4, the single-pole double-throw switch 5, the 2.4-4 GHz output matching circuit 6, the 0.9-2.5 GHz output matching circuit 7, and the output port 8 are connected in sequence.

[0027] The input port 1 is used to receive the target signal. The reconfigurable input matching circuit 2 is used to perform impedance matching between the signal of different frequency bands and the transistor input end. The circuit schematic diagram is shown in Figure 4 As shown, the PIN switch 3 controls whether the microstrip branch is connected to the main circuit to achieve the function of reconstructing the working frequency band of the input matching circuit. The circuit schematic diagram of the PIN switch 3 is shown in FIG. Figure 5 As shown, the microstrip line TL36 and the capacitor C2 play the role of current limiting and filtering respectively. The loss of the switching circuit to the RF signal is reduced by adjusting the values ​​of C1 and TL37, and the on and off states of the switch are switched by adjusting the voltage value of V_DC.

[0028] The bias circuit 4 cooperates with the transistor to amplify the signal.

[0029] The circuit of single-pole double-throw switch 5 is as follows Figure 6 As shown, it is based on the SMP1345 chip design, where C3 and L1 can filter out the DC component in the circuit; the bias circuit composed of TL39, TL41, C4 and TL43, TL44, C5 supplies power to SMP1345 to control the state of the switch. When V_DC1=3.3V and V_DC2=0V, it means that the upper branch is turned on and the lower branch is turned off; the lower branch is the opposite. The circuit loss to the RF signal is adjusted by adjusting the parameters of TL40 and TL42. S11 and S21 when the switch is turned on indicate that the switch circuit loss is small at this time. When the switch is turned off, S11 and S21 reflect that the switch isolation is high at this time. The single-pole double-throw switch has good performance in the range of 0 to 4GHz. The single-pole double-throw switch 5 connects the transistor, the 2.4 to 4GHz output matching circuit 6, and the 0.9 to 2.5GHz output matching circuit 7.

[0030] The 2.4-4 GHz output matching circuit 6 performs impedance matching on the amplified signal in the 2.4-4 GHz frequency band and the transistor output port; the 0.9-2.5 GHz output matching circuit 7 performs impedance matching on the amplified signal in the 0.9-2.5 GHz frequency band and the transistor output port, and the single-pole double-throw switch 5 controls the working states of the two output matching circuits.

[0031] The output port 8 is responsible for outputting the amplified signal and is connected to a lower-level signal receiving device.

[0032] A design of a four-fold frequency reconfigurable hybrid continuous class F ultra-wideband power amplifier using the above design includes the following steps:

[0033] Step 1: Connecting a signal at a first frequency to be amplified to the input port;

[0034] Step 2: According to the frequency of the input signal, select an input matching circuit that matches the signal frequency (open the PIN switch when a signal of 0.9 to 2.5 GHz is input, and close the PIN switch when a signal of 2.4 to 4 GHz is input.

[0035] Step 3: The input matching circuit impedance matches the input signal with the transistor impedance using the expanded impedance solution space.

[0036] Step 4: Use a single-pole double-throw switch to control the on and off of the 0.9-2.5 GHz output matching circuit and the 2.4-4 GHz output matching circuit respectively.

[0037] Step 5: The signal passing through the transistor is input into the single-pole double-throw switch control and matched with the output matching circuit according to its frequency, and impedance matching is performed with the expanded output impedance solution space, that is, the input signal power is amplified.

[0038] Step 6: The amplified input signal is outputted externally via the output port.

[0039] The overall circuit of the present invention is composed of a reconfigurable input matching circuit, two-way broadband output matching circuits and a single-pole double-throw switch. The power amplifier of the present invention is a hybrid continuous class F power amplifier with excellent bandwidth and efficiency performance; the circuit structure is realized by reconfigurable technology, the scattered frequency bands are integrated, and the working bandwidth of 0.9 to 4 GHz is achieved.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope defined by the claims of the present invention.

Claims

1. A reconfigurable hybrid continuous class F ultra-wideband power amplifier spanning four times the frequency, characterized in that: It includes an input port (1), a reconfigurable input matching circuit (2), a PIN switch (3), a bias circuit (4), a single-pole double-throw switch (5), a 2.4-4 GHz output matching circuit (6), a 0.9-2.5 GHz output matching circuit (7), and an output port (8) which are connected in sequence; The input port (1) is used to receive a target signal, and the reconfigurable input matching circuit (2) is used to perform impedance matching between signals in different frequency bands and the transistor input end; The PIN switch (3) controls whether the microstrip branch is connected to the main circuit to achieve the function of reconstructing the working frequency band of the input matching circuit; the bias circuit (4) cooperates with the transistor to amplify the signal; The 2.4-4 GHz output matching circuit (6) performs impedance matching between the amplified signal in the 2.4-4 GHz frequency band and the transistor output port; the 0.9-2.5 GHz output matching circuit (7) performs impedance matching between the amplified signal in the 0.9-2.5 GHz frequency band and the transistor output port, and the single-pole double-throw switch (5) controls the working states of the two output matching circuits; The output port (8) is responsible for outputting the amplified signal and is connected to a lower-level signal receiving device; The design of the reconfigurable hybrid continuous class F ultra-wideband power amplifier across four times the frequency includes the following steps: Step 1: Connecting a signal at a first frequency to be amplified to the input port (1); Step 2: According to the frequency of the input signal, select an input matching circuit that matches the signal frequency, disconnect the PIN switch (3) when a signal of 0.9 to 2.5 GHz is input, and close the PIN switch (3) when a signal of 2.4 to 4 GHz is input; Step 3: The input matching circuit performs impedance matching between the input signal and the transistor impedance using the expanded impedance solution space; Step 4: Using a single-pole double-throw switch (5) to control the on / off of the 0.9-2.5 GHz output matching circuit (7) and the 2.4-4 GHz output matching circuit (6); Step 5: Input the signal passing through the transistor into the single-pole double-throw switch (5) according to its frequency to control the matching output matching circuit, and perform impedance matching with the enlarged output impedance solution space, that is, the input signal power is amplified; Step 6: The amplified input signal is outputted externally via the output port (8).

2. The reconfigurable hybrid continuous class F ultra-wideband power amplifier across four times the frequency as claimed in claim 1, characterized in that: The reconfigurable input matching circuit (2) comprises a microstrip transmission line.

3. The reconfigurable hybrid continuous class F ultra-wideband power amplifier across four times the frequency as claimed in claim 1, characterized in that: The 2.4-4 GHz output matching circuit (6) and the 0.9-2.5 GHz output matching circuit (7) are connected to the transistor via a single-pole double-throw switch (5).

Images