Frequency continuous reconfigurable microwave control circuit based on switching transistor

Abstract

The invention belongs to the technical field of microwave integrated circuits, and particularly relates to a frequency continuous reconfigurable microwave control circuit based on a switch transistor. Comprising n switching transistors, n capacitors arranged in parallel and an inductor, wherein n is greater than or equal to 2; the grid electrode of each switch transistor is connected with an independent direct current control voltage source, and the drain electrode of each switch transistor is correspondingly connected with the first end of the capacitor to form a reconfigurable capacitor; source electrodes of all the switch tubes are jointly connected to a first node. The second ends of all the capacitors are jointly connected to a second node; the first end of the inductor is connected with a first node, and the second end of the inductor is connected with a second node, so that the n reconfigurable capacitors which are connected in parallel and the inductor form an LC resonance network, and a reconfigurable band-pass filtering network is formed. According to the continuous reconfigurable filter, the passband frequency is changed by utilizing the change of the switching state of the switching transistor, the problems of high design complexity, low integration level and the like of the existing continuous reconfigurable filter are solved, and free switching and adjustment among different frequency bands are realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of microwave integrated circuits, and in particular relates to a frequency continuously reconfigurable microwave control circuit based on a switching transistor. Background Art

[0002] With the development of wireless communication technology, especially the advancement of 5G and future 6G networks, the demand for spectrum resources in communication systems continues to increase. To fully utilize limited spectrum resources, frequency reconfigurability has become a key feature of modern microwave systems. Traditional microwave control circuits are typically optimized for specific frequencies, with fixed and non-adjustable frequency ranges. This results in a lack of flexibility and adaptability in dynamically changing communication environments. In existing technologies, continuously reconfigurable filters have been widely used to achieve flexible frequency control. However, these filters are typically complex in design, requiring the integration of numerous switching elements and complex control circuits. They are often implemented as independent operating modules and embedded in monolithic microwave integrated circuits. Therefore, the research of a frequency reconfigurable circuit that can freely switch and adjust between different frequency bands while also possessing a high level of integration is of great significance to current engineering fields. Summary of the Invention

[0003] The purpose of the present invention is to provide a frequency continuously reconfigurable microwave control circuit based on switching transistors to solve the problems of high design complexity and low integration of the above-mentioned existing continuously reconfigurable filters, and to achieve free switching and adjustment between different frequency bands.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A frequency continuously reconfigurable microwave control circuit based on switching transistors, comprising n switching transistors (Qs1, Qs2, ..., Qs n ), n capacitors connected in parallel (C1, C2, ..., C n ) and an inductor L0, where n ≥ 2;

[0006] Each switching transistor Qs n The gates of the n , each switching transistor Qs n The drain terminal of the capacitor C n The first end of the switch tube Qs forms a reconfigurable capacitor; n The sources of are commonly connected to the first node;

[0007] The second ends of all reconfigurable capacitors are commonly connected to the second node;

[0008] A first end of the inductor L0 is connected to the first node, and a second end thereof is connected to the second node, so that the n reconfigurable capacitors connected in parallel and the inductor L0 form an LC resonant network, thereby forming a reconfigurable bandpass filter network.

[0009] Furthermore, the switching transistor is a HEMT.

[0010] Furthermore, by controlling the control voltage input to each switching transistor, the narrowband frequency within the broadband can be continuously reconfigured.

[0011] Furthermore, according to requirements, the number of reconfigurable capacitors is increased to improve the adjustment accuracy and move the passband toward lower frequencies.

[0012] Furthermore, the inductor is an on-chip spiral inductor to improve the tuning efficiency and frequency stability of the LC resonant network.

[0013] Beneficial effects: The present invention can achieve continuous reconfiguration of narrowband frequency by adjusting the control voltage. This is achieved by changing the number of reconfigurable capacitors. The more reconfigurable capacitors there are, the lower the frequency reconfiguration range will be. By changing the values of the capacitors and inductors in the reconfigurable bandpass network, the frequency reconfiguration range of the narrowband is adjusted, thereby solving the problem of continuous switching of narrowband frequency on a microwave monolithic integrated circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the frequency continuously reconfigurable microwave control circuit of Example 1;

[0015] Figure 2 This is a schematic diagram of a frequency continuously reconfigurable microwave control circuit according to Example 2;

[0016] Figure 3 This is a schematic diagram of a frequency continuously reconfigurable microwave control circuit according to Example 3;

[0017] Figure 4 This is a simulation result diagram of the frequency continuous reconfigurable microwave control circuit of Example 1;

[0018] Figure 5 This is a diagram showing the simulation results of the frequency-continuously reconfigurable microwave control circuit of Example 2;

[0019] Figure 6 This is a diagram showing the simulation results of the frequency-continuously reconfigurable microwave control circuit of Example 3. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

[0021] The present invention provides a frequency continuous reconfigurable microwave control circuit based on a switching transistor, comprising n switching transistors (Qs1, Qs2, ..., Qs n ), n capacitors connected in parallel (C1, C2, ..., C n ) and an inductor L0, where n≥2; each switching transistor Qs n The gates of the n , each switching transistor Qs n The drain terminal of the capacitor C n The first end of the switch tube Qs forms a reconfigurable capacitor n The sources of the n reconfigurable capacitors are commonly connected to the first node; the second ends of all the reconfigurable capacitors are commonly connected to the second node; the first end of the inductor L0 is connected to the first node, and the second end is connected to the second node, so that the n reconfigurable capacitors connected in parallel and the inductor L0 form an LC resonant network, forming a reconfigurable bandpass filter network.

[0022] During implementation, by changing the control voltage of each switching transistor, the equivalent capacitance of the corresponding reconfigurable capacitor can be changed, thereby changing the equivalent capacitance of the reconfigurable capacitor group, achieving the shift of the center frequency of the bandpass network and achieving narrowband frequency reconfiguration. In the LC resonant network composed of n parallel reconfigurable capacitors and inductor L0, assuming the number of conducting switches is k (k = 1, 2, ..., n), the center frequency that can be obtained in the reconfigurable microwave control circuit is:

[0023]

[0024] Among them, f0 is the center frequency of the LC resonant network, L0 is the inductance value, C i is the capacitance value of the capacitor in the i-th (i=1, 2, ..., k) reconfigurable capacitor. The above structure will be experimentally verified through three embodiments below, each of which uses a different number of switching transistors and reconfigurable capacitors:

[0025] Example 1

[0026] According to the above circuit structure, this embodiment is composed of two reconstruction capacitors, two switching transistors and one inductor. For the specific circuit structure, please refer to Figure 1 . Figure 4 This is a simulation result diagram of the frequency continuous reconfigurable microwave control circuit of this embodiment, as shown in FIG. Figure 4 As shown: When the control voltage V c1 =V c2 =0V, the center frequency is 4.2~4.6GHz, corresponding to Figure 4 Mode 1 in this frequency range has an insertion loss of less than 1.1dB; when the control voltage V c1 =-40V, Vc2 =0V, the center frequency is 4.6~5.2GHz, corresponding to Figure 4 In mode 2, the insertion loss is less than 1.1dB in this frequency range; when the control voltage V c1 =0V, V c2 =-40V, the center frequency is 5.55~6.65GHz, corresponding to Figure 4 Mode 3: The insertion loss is less than 0.75dB in this frequency range; when the control voltage V c1 =V c2 =-40V, the center frequency is 8~9GHz, corresponding to Figure 4 Mode 4: The insertion loss is less than 0.25dB in this frequency range.

[0027] Figure 4 The simulation results show that the frequency continuously reconfigurable microwave control circuit of this embodiment can achieve multiple narrowband reconfigurations within 4.4 to 8.5 GHz, that is, when two reconfigurable capacitors are used, only the center frequency can be adjusted.

[0028] Example 2

[0029] According to the above circuit structure, this embodiment adopts three reconstruction capacitors, three switching transistors and one inductor. For the specific circuit structure, please refer to Figure 2 . Figure 5 This is a simulation result diagram of the frequency continuous reconfigurable microwave control circuit of this embodiment, as shown in FIG. Figure 5 As shown: When the control voltage V c1 =V c2 =V c3 =0V, the center frequency is 3.15~3.45GHz, corresponding to Figure 5 Mode 1: The insertion loss is less than 1.5dB in this frequency range. c1 =V c2 =0V, V c3 =-40V, the center frequency is 4.1~4.3GHz, corresponding to Figure 5 Mode 2: The insertion loss is less than 1dB in this frequency range; when the control voltage V c1 =0V, V c2 =V c3 =-40V, the center frequency is 5.4~6GHz, corresponding to Figure 5 Mode 3: The insertion loss is less than 0.6dB in this frequency range; when the control voltage V c1 =V c2 =V c3 =-40V, the center frequency is 7~7.6GHz, corresponding to Figure 5 Mode 4: The insertion loss is less than 0.25dB in this frequency range.

[0030] Figure 5 The simulation results show that the control voltage V cn The value of (n=1,2,3) switches between -40V and 0V, which can achieve different equivalent capacitance values of the reconfigurable capacitor group, thereby controlling the continuous movement of the passband center frequency within 3.3~7.3GHz and realizing continuous reconfiguration of the narrowband frequency. However, the adjustment accuracy of the narrowband center frequency is insufficient.

[0031] Example 3

[0032] According to the above circuit structure, this embodiment adopts four reconstruction capacitors, four switching transistors and one inductor. For the specific circuit structure, please refer to Figure 3 .like Figure 6 As shown: When the control voltage V c1 =V c2 =V c3 =V c4 =0V, the center frequency is 2.35~2.45GHz, corresponding to Figure 6 Mode 1: The insertion loss is less than 2dB in this frequency range; when the control voltage V c1 =V c3 =0V, V c2 =V c4 =-40V, its center frequency is 3.3~3.7GHz, corresponding Figure 6 Mode 2: The insertion loss is less than 1.5dB in this frequency range. c1 =V c3 =V c4 =-10V, V c2 =0V, the center frequency is 4.05~4.65GHz, corresponding to Figure 6 Mode 3: The insertion loss is less than 1dB in this frequency range; when the control voltage V c1 =V c2 =V c3 =V c4 =-40V, the center frequency is 5.7~6.9GHz, corresponding Figure 6 Mode 4: The insertion loss is less than 0.5dB in this frequency range.

[0033] Figure 6 The simulation results show that the control voltage V cn Switching the value of (n=1, 2, 3, 4) between -40V, -10V and 0V can achieve different equivalent capacitance values of the reconfigurable capacitor group, thereby controlling the continuous movement of the passband center frequency within 2.4 to 6.3GHz, realizing continuous reconfiguration of the narrowband frequency within 2.4 to 6.3GHz with higher adjustment accuracy.

[0034] In summary, this embodiment provides a novel microwave frequency continuously reconfigurable circuit based on switching transistors. By controlling the control voltage of the switching transistors in the circuit, the narrowband frequency within the broadband can be continuously reconfigured. Increasing the number of reconfigurable capacitors can improve the adjustment accuracy of the narrowband frequency and shift the passband of the entire reconfigurable bandpass network toward the low frequency. This circuit uses the change in the switching state of the switching transistor to change the passband frequency. Compared with traditional circuits, its advantage is that it does not rely on a fixed frequency band or a preset frequency synthesis mechanism, but instead achieves more flexible operation within a wide frequency range through dynamic frequency control based on the switching transistor. The present invention achieves frequency fine-tuning through precise adjustment of the control voltage, can adapt to application scenarios of multiple communication standards or frequency bands, and supports fast frequency switching. The integrated design reduces hardware complexity while improving the scalability and compatibility of the system. It can meet the application requirements of various microwave frequency bands and has significant application value.

[0035] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A frequency continuously reconfigurable microwave control circuit based on a switching transistor, characterized in that: The device comprises n switching transistors, n capacitors connected in parallel and an inductor L0, wherein n≥2; The gate of each switching transistor is connected to an independent DC control voltage source, and the drain of each switching transistor is connected to the first end of the capacitor to form n reconfigurable capacitors; the source of all the switching transistors is connected to the first node in common; The second ends of all reconfigurable capacitors are commonly connected to the second node; A first end of the inductor L0 is connected to the first node, and a second end thereof is connected to the second node, so that the n reconfigurable capacitors connected in parallel and the inductor L0 form an LC resonant network, thereby forming a reconfigurable bandpass filter network.

2. A frequency continuously reconfigurable microwave control circuit based on a switching transistor according to claim 1, characterized in that: The switching transistor is a HEMT.

3. The frequency continuously reconfigurable microwave control circuit based on a switching transistor according to claim 1, characterized in that: By controlling the control voltage input to each switching transistor, the narrowband frequency within the broadband can be continuously reconfigured.

4. The frequency continuously reconfigurable microwave control circuit based on a switching transistor according to claim 1, characterized in that: As needed, the number of reconfigurable capacitors can be increased to improve the adjustment accuracy and move the passband toward lower frequencies.

5. A frequency continuously reconfigurable microwave control circuit based on a switching transistor according to any one of claims 1 to 4, characterized in that: The inductor is an on-chip spiral inductor.

Images