Electrically tunable amplitude equalizer and control system

Abstract

The invention discloses an electrically-controlled amplitude equalizer and a control system. The electrically-controlled amplitude equalizer comprises a symmetric network module, a matching module, an electrically-controlled attenuation module, a signal input and output module and a voltage control end, the voltage control end comprises a first control end, a second control end and a third control end, the matching module comprises a matching capacitor, the first control end is connected with the matching capacitor, and the capacitance value of the matching capacitor is adjusted through the voltage of the first control end; the electrically controlled attenuation module comprises an adjustable impedance device; the bias voltage of the controllable impedance device is adjusted through the voltage of the second control end and the third control end so as to control the attenuation amount of the electrically controlled attenuation module; the signal input and output module comprises a first port and a second port; the first port receives an external signal, and the external signal is output by the second port after being processed by the symmetric network module, the electrically controlled attenuation module and the matching module. According to the invention, broadband reflection-free and variable equalization slope are realized, and the method is suitable for various signal processing scenes.

Description

Technical Field

[0001] The present invention relates to the technical field of equalizers, and in particular to an electrically adjustable amplitude equalizer and a control system. Background Art

[0002] In communication systems, equalizers, as a key signal processing device, are widely used to adjust frequency response to compensate for nonlinear distortion in transmission links. Existing equalizers are mainly divided into four types: lumped parameter type, coaxial type, waveguide type, and integrated transmission line type. Among them, coaxial and waveguide equalizers are suitable for equalization of high-power circuits due to their large size and generally mechanical tuning; while integrated transmission line equalizers are limited in their application range because their tuning is not flexible or difficult to tune.

[0003] In contrast, the lumped parameter equalizer has become a solution with broad application prospects due to its simple structure, small size and easy integration with solid-state circuits. However, the traditional lumped parameter equalizer still has certain limitations, such as the difficulty in achieving broadband non-reflection characteristics and the non-adjustable equalization slope. Summary of the invention

[0004] In order to overcome the above technical problems, the present invention provides an electrically adjustable amplitude equalizer and a control system, which can achieve broadband reflection-free and variable equalization slope and is suitable for a variety of signal processing scenarios.

[0005] In order to solve the above technical problems, the first aspect of the present invention discloses an electrically adjustable amplitude equalizer, comprising: a symmetrical network module, a matching module, an electrically adjustable attenuation module, a signal input and output module and a voltage control terminal;

[0006] The voltage control end includes a first control end, a second control end and a third control end, the matching module includes a matching capacitor, the first control end is connected to the matching capacitor, and the capacitance value of the matching capacitor is adjusted by the voltage of the first control end;

[0007] The electrically adjustable attenuation module includes an adjustable impedance device; the bias voltage of the controllable impedance device is adjusted by the voltage of the second control terminal and the third control terminal to control the attenuation amount of the electrically adjustable attenuation module;

[0008] The signal input and output module includes a first port and a second port; the first port receives an external signal, and the external signal is output from the second port after being processed by the symmetrical network module, the electrically adjustable attenuation module, and the matching module.

[0009] In some embodiments, the matching module also includes a matching inductor L8, a matching inductor L9, and a switch tube MOS1; the voltage control end also includes a fourth control end, and the voltage of the fourth control end controls the equivalent inductance of the matching inductor L8 and the matching inductor L9 through the switch tube MOS1 to adjust the impedance of the matching module.

[0010] In some embodiments, the matching capacitor includes capacitor C4, capacitor C5 and a varactor; the varactor and capacitor C4, capacitor C5, matching inductor L8, and matching inductor L9 form an LC matching network, and the capacitance value of the varactor is controlled by the first control end to adjust the impedance of the LC matching network.

[0011] In some embodiments, the controllable impedance device includes a diode PIN1 and a diode PIN2, wherein the diode PIN1 and the diode PIN2 are connected in series, the bias voltage of the diode PIN1 is adjusted by the second control terminal, and the bias voltage of the diode PIN2 is adjusted by the third control terminal.

[0012] In some embodiments, the symmetrical network module includes capacitor C1, capacitor C2, capacitor C3, inductor L1, and inductor L2. Capacitor C1 and inductor L1 and inductor L2 form an LC loop; capacitor C2, capacitor C3 and inductor L1 and inductor L2 form a symmetrical LC network.

[0013] In some embodiments, the attenuator module further includes a diode PIN3, and the diode PIN1, the diode PIN2, and the diode PIN3 form a T-type attenuator;

[0014] The equivalent resistance of diode PIN1, diode PIN2 and diode PIN3 is

[0015]

[0016] Where A is the attenuation in decibels, and Z0 is the port impedance of the electronically adjustable amplitude equalizer.

[0017] In some embodiments, the controllable impedance device includes a plurality of FET field effect transistors, and the FET field effect transistors constitute a T-type attenuator.

[0018] In some embodiments, the capacitance of the capacitor C1 is

[0019]

[0020] The capacitance values ​​of the capacitors C2 and C3 are

[0021]

[0022] The inductance values ​​of the inductor L1 and the inductor L2 are

[0023]

[0024] Wherein, Z0 is the port impedance of the electrically adjustable amplitude equalizer, and ω0 is the central angular frequency of the electrically adjustable amplitude equalizer.

[0025] In some embodiments, it further includes a first low-pass module, a second low-pass module and a high-pass module, wherein the input ends of the first low-pass module and the second low-pass module are connected to the first port, and the output ends of the first low-pass module and the second low-pass module are connected to the input end of the matching module; the input end of the high-pass module is connected to the first port, and the output end of the high-pass module is connected to the input end of the matching module.

[0026] According to a second aspect of the present invention, an electrically adjustable amplitude equalizer control system is disclosed, comprising:

[0027] The control module is connected to the voltage control end, and the control module is used to output a voltage control signal, and the voltage control signal is used to adjust the matching module and the electrically adjustable attenuation module of any of the above-mentioned electrically adjustable amplitude equalizers through the voltage control end.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The present invention provides an electrically adjustable amplitude equalizer and control system, which integrates a symmetrical network, a matching module and an electrically adjustable attenuation module, and accurately adjusts the matching capacitor and the adjustable impedance device through a voltage control terminal to achieve variable slope, adjustable equalization bandwidth, flexible attenuation control and wide application adaptability, can effectively reduce signal reflection and interference, improve transmission efficiency, and is suitable for various high-frequency signal processing scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A circuit schematic diagram of the electrically adjustable amplitude equalizer provided by the present invention;

[0031] Figure 2 A schematic diagram of the structure of the electrically adjustable amplitude equalizer provided by the present invention;

[0032] Figure 3 A narrowband forward transmission loss curve diagram provided by the present invention;

[0033] Figure 4 A narrowband reverse transmission loss curve diagram provided by the present invention;

[0034] Figure 5 A broadband forward transmission loss curve diagram provided by the present invention;

[0035] Figure 6This is a broadband reverse transmission loss curve provided by the present invention. DETAILED DESCRIPTION

[0036] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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.

[0037] The terms "including" and "having" and any variations thereof in the embodiments of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or modules is not necessarily limited to those steps or modules explicitly listed, but may include other steps or modules not explicitly listed or inherent to these processes, methods, products or apparatus.

[0038] The embodiment of the present invention discloses an electrically adjustable amplitude equalizer, which changes the slope of the equalizer by controlling the attenuation of an electrically adjustable attenuation module, thereby improving transmission efficiency and is suitable for various high-frequency signal processing scenarios.

[0039] like Figure 1 As shown, the electrically adjustable amplitude equalizer includes a symmetrical network module, a matching module, an electrically adjustable attenuation module, a signal input and output module and a voltage control end; the voltage control end includes a first control end, a second control end and a third control end, the matching module includes a matching capacitor, the first control end is connected to the matching capacitor, and the capacitance value of the matching capacitor is adjusted by the voltage of the first control end; the electrically adjustable attenuation module includes an adjustable impedance device; the bias voltage of the controllable impedance device is adjusted by the voltage of the second control end and the third control end to control the attenuation amount of the electrically adjustable attenuation module; the signal input and output module includes a first port and a second port; the first port receives an external signal, and the external signal is processed by the symmetrical network module, the electrically adjustable attenuation module and the matching module and then output by the second port.

[0040] like Figure 2 As shown, the first low-pass module, the second low-pass module and the high-pass module, the input ends of the first low-pass module and the second low-pass module are connected to the first port, and the output ends of the first low-pass module and the second low-pass module are connected to the input end of the matching module; the input end of the high-pass module is connected to the first port, and the output end of the high-pass module is connected to the input end of the matching module. The external signal enters the corresponding first low-pass module, second low-pass module or high-pass module through the first port, and is output from the second port after being processed by the symmetrical network module, the electrically adjustable attenuation module, and the matching module.

[0041] The symmetrical network module includes capacitor C1, capacitor C2, capacitor C3, inductor L1, and inductor L2. Capacitor C1 and inductor L1 and inductor L2 form an LC loop; capacitor C2, capacitor C3 and inductor L1 and inductor L2 form a symmetrical LC network. The symmetrical network structure is used to achieve broadband non-reflection characteristics. The input signal enters from the first port, passes through the symmetrical LC network composed of capacitor C1, capacitor C2, capacitor C3 and inductor L1 and inductor L2, passes through the electrically adjustable attenuation module and the matching module, and is finally output from the second port. The symmetrical network module makes the impedance matching between the input and output ports more precise, thereby reducing signal reflection and loss. By adjusting the component parameters in the LC network, the signal slope can be adjusted while maintaining the non-reflection characteristics within a wide bandwidth. This symmetrical network setting enables the electrically adjustable amplitude equalizer to efficiently and accurately adjust the signal, and is suitable for various application scenarios that require precise frequency response adjustment.

[0042] Specifically, in the symmetrical network module, capacitor C1, capacitor C2, and capacitor C3 are respectively:

[0043]

[0044] Inductance L1 and inductance L2 are:

[0045]

[0046] Wherein, Z0 is the port impedance of the electrically adjustable amplitude equalizer, and ω0 is the center angular frequency of the electrically adjustable amplitude equalizer.

[0047] After passing through the symmetrical network, the signal enters the electrically adjustable attenuation module, and the electrically adjustable attenuation module adjusts the attenuation of the signal. The electrically adjustable attenuation module includes an adjustable impedance device, and the bias voltage of the controllable impedance device is adjusted by the voltage of the second control terminal V2 and the third control terminal V3 to control the attenuation of the electrically adjustable attenuation module. The adjustable impedance device includes a plurality of diodes, and the bias voltage of the diode is adjusted by the voltage control terminal to change the attenuation of the module. The attenuation of the signal is dynamically adjusted through the voltage control terminal according to the external control voltage, and the amplitude of the signal is changed to achieve a specific equalization slope or compensation effect.

[0048] like Figure 1As shown, the adjustable impedance device in the present application includes a diode PIN1 and a diode PIN2, wherein the diode PIN1 and the diode PIN2 are connected in series, and the bias voltage of the diode PIN1 is adjusted by the second control terminal, and the bias voltage of the diode PIN2 is adjusted by the third control terminal. The second control terminal is connected to the cathode of the diode PIN1, and the third control terminal is connected to the cathode of the diode PIN2. The voltage of the second control terminal and the third control terminal is adjusted to control the conduction state and equivalent resistance of the diode PIN1 and the diode PIN2, and adjust the attenuation of the signal. In the present application, the series arm impedance adopts two reverse-connected PIN diodes. Using two PIN diodes instead of one PIN diode can increase the attenuation or double the upper limit of the operating frequency. Since the series resistance of the twin diodes has a phase difference of 180 degrees, even-order distortion can be offset. Moreover, a symmetrical attenuation network and a simpler bias circuit are obtained by two reverse-connected PIN diodes.

[0049] It also includes a diode PIN3, which is connected to the third control terminal, and the third control terminal can adjust its conduction state, thereby adjusting its equivalent resistance. The conduction state of PIN3 directly affects the intermediate node potential of the electrically adjustable attenuation module, thereby affecting the attenuation of the entire electrically adjustable amplitude equalizer. Diode PIN3 usually works in conjunction with diode PIN1 and diode PIN2 to jointly determine the total attenuation of the electrically adjustable attenuation module. By adjusting diode PIN3, while maintaining the fixed bias of diode PIN1 and diode PIN2, the attenuation can be finely controlled, which can effectively reduce the nonlinear distortion of the electrically adjustable attenuation module in high-frequency signal processing and improve the linearity and stability of the circuit.

[0050] Furthermore, the adjustment of the diode PIN3 can also be used to control the frequency response of the electrically adjustable attenuation module, so that it can maintain good attenuation characteristics in a wider frequency range. Through the cooperation of the PIN diode and the control voltage terminal, dynamic adjustment of signal attenuation is achieved. Through precise circuit connection relationships, the electrically adjustable attenuation module can flexibly control the strength of the signal, adapt to different application requirements, and is widely used in RF and microwave systems.

[0051] The diodes PIN 1, PIN 2 and PIN 3 form a T-type attenuator, and its equivalent resistance is

[0052]

[0053] Where A is the attenuation in decibels, and Z0 is the port impedance of the electronically adjustable amplitude equalizer.

[0054] In some embodiments, the PIN diode is replaced by a FET field effect tube. By adjusting the gate voltage of the FET field effect tube, the on-resistance between the drain and the source is controlled, thereby adjusting the attenuation of the signal. Under different gate voltages, the on-resistance of the FET will change, thereby affecting the degree of signal passing. Compared with the PIN diode, the FET can control the on-resistance more accurately, and is suitable for applications requiring high linearity or low distortion. It can be used in circuits such as low-noise amplifiers, mixers, and modulators, especially in radio frequency circuits with high requirements for linearity and noise.

[0055] The electronically adjustable amplitude equalizer also includes a matching module, which adjusts the input and output impedances of the circuit so that they match the impedances of the previous and next stage circuits or systems, thereby achieving optimal power transmission and signal integrity, ensuring that the transmission efficiency of the signal in the circuit is maximized, and minimizing the reflection and loss of the signal. The matching module includes a matching inductor L8, a matching inductor L9, and a switch tube MOS1; the voltage control end also includes a fourth control end V4, and the voltage of the fourth control end controls the equivalent inductance of the matching inductor L8 and the matching inductor L9 through the switch tube MOS1 to adjust the impedance of the matching module. The fourth control end V4 controls the switch tube MOS1 to adjust the equivalent inductance of the matching inductor L8 and the matching inductor L9. When the switch tube MOS1 is fully turned on, a large current is allowed to flow, and the matching inductor L8 is connected in parallel with the matching inductor L9 to form a combined inductor. The equivalent inductance of the parallel inductor is smaller than that of the single matching inductor L8 or the matching inductor L9, which is suitable for processing higher frequency signals. On the contrary, when the switch tube MOS1 is turned off, it is equivalent to an open circuit, the matching inductor L8 is in working state, the matching inductor L9 does not participate in the circuit operation, and the equivalent inductance value is the inductance of L8, which is suitable for processing lower frequency signals.

[0056] Furthermore, multiple MOS switches can be introduced into the matching module to control the connection status of multiple inductors respectively, so as to realize more types of inductor combinations, so that the equivalent inductance has a wider adjustment range and can adapt to wider frequency bandwidth requirements. For example, single inductor mode: when all switch tubes are turned off, only the matching inductor L8 is in working state and has the maximum inductance. Parallel inductor mode: when the switch tubes are turned on one by one, the matching inductor L8 can be connected in parallel with other matching inductors L9 and matching inductor L10, so that the total inductance gradually decreases to adapt to higher frequency band signal processing. By selecting an appropriate matching inductor combination, the frequency response of the circuit can be accurately adjusted without adding additional hardware complexity to meet a variety of application requirements.

[0057] Furthermore, the matching module further includes a matching capacitor for adjusting the slope curve and the return loss, and the matching capacitor is connected to the first control terminal. The matching capacitor includes a capacitor C4, a capacitor C5 and a varactor diode DIODE1; the varactor diode and the capacitor C4, the capacitor C5, the matching inductor L8, and the matching inductor L9 form an LC matching network, and the reverse bias voltage of the varactor diode is controlled by the first control terminal V1, thereby adjusting the capacitance value and adjusting the impedance of the LC matching network.

[0058] The anode of the varactor is connected to the low potential terminal or ground, and the cathode is connected to the external control voltage, i.e., the first control terminal. When the applied reverse bias voltage increases, the junction capacitance of the varactor decreases; conversely, when the reverse bias voltage decreases, the junction capacitance increases. The varactor is connected in parallel with capacitors C4 and C5, or in series / parallel with matching inductors L8 and L9 to form an LC matching network. The varactor is a special diode whose capacitance value can be adjusted by the external voltage applied to the first control terminal. By changing the voltage applied to the varactor, its capacitance value is dynamically adjusted, and the impedance of the matching module is fine-tuned, thereby further optimizing the impedance matching and frequency response characteristics of the circuit, so that the circuit can dynamically adapt to different operating frequencies.

[0059] The narrowband and broadband modes can be switched by adjusting the equivalent inductance of the matching inductor L8 and the matching inductor L9. Increasing the equivalent inductance switches to the broadband mode, and vice versa switches to the narrowband mode. At the same time, the equivalent capacitance of the varactor diode also needs to be fine-tuned to improve the slope of the equalizer.

[0060] The combination of matching capacitors with adjustable capacitance values ​​and matching inductors ensures the stability and consistency of the signal throughout the transmission path, reducing signal distortion and power loss caused by impedance mismatch. When a varactor is connected in parallel with a matching capacitor, the equivalent capacitance of the entire circuit is the sum of the two. By adjusting the capacitance of the varactor, the total capacitance value can be dynamically changed, thereby adjusting the resonant frequency of the circuit. When a varactor is connected in series with a matching inductor, an adjustable resonant circuit is formed. This configuration allows the circuit's response to a specific frequency to be dynamically adjusted through voltage control, and the electrically adjustable amplitude equalizer can maintain optimal performance at different frequencies and operating conditions.

[0061] Furthermore, the electrically adjustable amplitude equalizer also includes a plurality of bias inductors, bias resistors, and DC blocking capacitors, which are connected to controllable impedance devices to control the bias voltage of the controllable impedance devices and isolate AC signals and DC biases to ensure that the devices can work normally and do not interfere with signal transmission. The bias inductors include inductors L3, L4, L5, L6, and L7; the bias resistors include resistors R1, R2, R3, R4, and R5; and the DC blocking capacitors include capacitors C6, C7, and C8 to isolate AC signals, stabilize signal transmission, and maintain signal integrity and stability. The bias inductors and bias resistors work together in the electrically adjustable amplitude equalizer to ensure that the active devices obtain stable DC bias currents, while effectively isolating AC signals and DC biases to prevent mutual interference. The bias inductors provide a low impedance path for DC and isolate high-frequency signals, while the bias capacitors are used to couple AC signals and isolate DC biases.

[0062] Based on the same inventive concept, the present application provides an electrically adjustable amplitude equalizer control system, including: a control module connected to a voltage control end, the control module is used to output a voltage control signal, and the voltage control signal is used to adjust the matching module and the electrically adjustable attenuation module of the electrically adjustable amplitude equalizer as described above through the voltage control end.

[0063] like Figure 3 , 4 , 5, and 6, where the horizontal axis is the frequency in GHz and the vertical axis is the forward transmission coefficient. Figure 3 This is a narrowband forward transmission loss curve. In the forward transmission loss graph, as the frequency increases from 600MHz to 1GHz, the S21 loss decreases rapidly from -1.707dB to nearly -0.388dB, indicating that the insertion loss decreases rapidly with increasing frequency. The rate of this change is the slope. This significant insertion loss change caused by frequency change shows that the equalizer has a larger slope when set in a narrowband. Within the balanced frequency band, the amplitude of S21 is proportional to the frequency, that is, as the frequency increases, the insertion loss decreases. When the frequency increases, the transmission loss of the signal decreases, allowing the equalizer to effectively compensate for the attenuation of the signal within the set balanced frequency band and maintain better transmission quality.

[0064] Figure 4The reverse transmission loss curve for narrowband, the smaller the reflection coefficient S11, the smaller the reflection loss, that is, the better the matching of signal transmission, the less energy reflected back. In the low frequency band, such as around 600MHz, it shows a large reflection loss, about -35dB, which indicates that in this frequency band, the port matching is good and the reflection is small. In the high frequency band, the reflection coefficient increases slightly, indicating that there may be a slight increase in reflection in the high frequency band, but the overall matching characteristics are still good. Outside the equalization band, the S21 and S11 curves tend to be flat, showing that the frequency response of the equalizer outside the narrow band is relatively stable, especially suitable for scenarios where only local equalization within the band is required, such as compensating for the attenuation of the amplifier in the high frequency band, thereby widening its operating bandwidth.

[0065] Figure 5 , Figure 6 The forward transmission loss curve and the reverse transmission loss curve of the broadband are shown in Figure 2. In the broadband, as the frequency increases, the transmission loss of the signal decreases rapidly, showing a large slope. This equalizer can effectively compensate for low-frequency attenuation in the broadband range, so that the signal maintains a stable transmission effect.

[0066] The present invention provides an electrically adjustable amplitude equalizer and control system, which integrates a symmetrical network, a matching module and an electrically adjustable attenuation module, and accurately adjusts the matching capacitor and the adjustable impedance device through a voltage control terminal to achieve variable slope, adjustable equalization bandwidth, flexible attenuation control and wide application adaptability, can effectively reduce signal reflection and interference, improve transmission efficiency, and is suitable for various high-frequency signal processing scenarios.

[0067] The processing method of the system can refer to the description of the above method and will not be repeated here.

[0068] The present invention also provides a device, which may include: a memory storing executable program code;

[0069] a processor coupled to the memory;

[0070] A transceiver used to communicate with other devices or communication networks and to receive or send network messages;

[0071] A bus used to connect memory, processors, and transceivers for internal communication.

[0072] The transceiver receives messages transmitted over the network and passes them to the processor via the bus. The processor calls the executable program code stored in the memory through the bus for processing, and passes the processing results to the transceiver via the bus for sending, thereby realizing the method provided in the embodiment of the present application.

[0073] An embodiment of the present application also provides a non-transitory machine-readable storage medium, on which an executable program is stored. When the executable program is executed by a processor, the processor executes the processing method provided in the above embodiment.

[0074] An embodiment of the present invention discloses a computer-readable storage medium storing a computer program for electronic data exchange, wherein the computer program enables a computer to execute the described method.

[0075] An embodiment of the present invention discloses a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to enable a computer to execute the described method.

[0076] The embodiments described above are only illustrative, wherein the modules described as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules, i.e., they may be located in one place, or they may be distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without paying creative labor.

[0077] Through the specific description of the above embodiments, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the above technical solution can be essentially or partly contributed to the prior art in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, and the storage medium includes a read-only memory (ROM), a random access memory (RAM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), a one-time programmable read-only memory (OTPROM), an electronically erasable rewritable read-only memory (EEPROM), a compact disc (CD-ROM) or other optical disc storage, magnetic disk storage, magnetic tape storage, or any other computer-readable medium that can be used to carry or store data.

[0078] Finally, it should be noted that the embodiments disclosed in the present invention are only preferred embodiments of the present invention, which are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An electrically adjustable amplitude equalizer, characterized in that: include: Symmetrical network module, matching module, electrical attenuation module, signal input and output module and voltage control terminal; The voltage control end includes a first control end, a second control end and a third control end, the matching module includes a matching capacitor, the first control end is connected to the matching capacitor, and the capacitance value of the matching capacitor is adjusted by the voltage of the first control end; The electrically adjustable attenuation module includes an adjustable impedance device; the bias voltage of the controllable impedance device is adjusted by the voltage of the second control terminal and the third control terminal to control the attenuation amount of the electrically adjustable attenuation module; The signal input and output module includes a first port and a second port; the first port receives an external signal, and the external signal is output from the second port after being processed by the symmetrical network module, the electrically adjustable attenuation module, and the matching module.

2. The electrically adjustable amplitude equalizer according to claim 1, characterized in that: The matching module also includes matching inductors L8, L9, and a switch tube MOS1; the voltage control end also includes a fourth control end, and the voltage of the fourth control end controls the equivalent inductance of the matching inductors L8 and L9 through the switch tube MOS1 to adjust the impedance of the matching module.

3. The electrically adjustable amplitude equalizer according to claim 2, characterized in that: The matching capacitor includes capacitor C4, capacitor C5 and a varactor; the varactor and capacitor C4, capacitor C5, matching inductor L8 and matching inductor L9 form an LC matching network, and the capacitance value of the varactor is controlled by the first control end to adjust the impedance of the LC matching network.

4. The electrically adjustable amplitude equalizer according to claim 1, characterized in that: The controllable impedance device includes a diode PIN1 and a diode PIN2, wherein the diode PIN1 and the diode PIN2 are connected in series, and the bias voltage of the diode PIN1 is adjusted by the second control terminal, and the bias voltage of the diode PIN2 is adjusted by the third control terminal.

5. An electrically adjustable amplitude equalizer according to any one of claims 1 to 4, characterized in that: The symmetrical network module includes capacitor C1, capacitor C2, capacitor C3, inductor L1, and inductor L2. Capacitor C1 and inductor L1 and inductor L2 form an LC loop; capacitor C2, capacitor C3 and inductor L1 and inductor L2 form a symmetrical LC network.

6. The electrically adjustable amplitude equalizer according to claim 4, characterized in that: The adjustable impedance device of the electrically adjustable attenuation module includes a diode PIN3, and the diode PIN1, the diode PIN2 and the diode PIN3 form a T-type attenuator; The equivalent resistance of diode PIN1, diode PIN2 and diode PIN3 is Where A is the attenuation and Z0 is the port impedance of the electronically adjustable amplitude equalizer.

7. The electrically adjustable amplitude equalizer according to claim 1, characterized in that: The controllable impedance device includes a plurality of FET field effect transistors, and the FET field effect transistors constitute a T-type attenuator.

8. The electrically adjustable amplitude equalizer according to claim 5, characterized in that: The capacitance value of capacitor C1 is The capacitance values ​​of the capacitors C2 and C3 are The inductance values ​​of the inductor L1 and the inductor L2 are Wherein, Z0 is the port impedance of the electrically adjustable amplitude equalizer, and ω0 is the central angular frequency of the electrically adjustable amplitude equalizer.

9. The electrically adjustable amplitude equalizer according to claim 1, characterized in that: It also includes a first low-pass module, a second low-pass module and a high-pass module, wherein the input ends of the first low-pass module and the second low-pass module are connected to the first port, and the output ends of the first low-pass module and the second low-pass module are connected to the input end of the matching module; the input end of the high-pass module is connected to the first port, and the output end of the high-pass module is connected to the input end of the matching module.

10. An electrically adjustable amplitude equalizer control system, characterized in that: include: The control module is connected to the voltage control end, and the control module is used to output a voltage control signal, and the voltage control signal is used to adjust the matching module and the electrically adjustable attenuation module of the electrically adjustable amplitude equalizer as described in any one of claims 1-9 through the voltage control end.

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