An electric amplitude equalizer and control system

Abstract

The present invention discloses an electronically tunable amplitude equalizer and a control system, comprising: a symmetric network module, a matching module, an electronically tunable attenuation module, a signal input / output module and a voltage control terminal; the voltage control terminal includes a first control terminal, a second control terminal and a third control terminal, the matching module includes a matching capacitor, the first control terminal is connected to the matching capacitor, and the capacitance value of the matching capacitor is adjusted by the voltage of the first control terminal; the electronically tunable attenuation module includes a tunable impedance device; the bias voltage of the controllable impedance device is adjusted by the voltages of the second control terminal and the third control terminal to control the attenuation amount of the electronically tunable attenuation module; the signal input / 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 symmetric network module, the electronically tunable attenuation module and the matching module. The present invention realizes broadband non-reflection and variable equalization slope, and is suitable for various signal processing scenarios.

Description

Technical Field

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

[0002] In a communication system, as a key signal processing device, an equalizer is widely used to adjust the frequency response to compensate for the non-linear distortion in the transmission link. The existing equalizers are mainly divided into four forms: lumped parameter type, coaxial type, waveguide type, and integrated transmission line type. Among them, the coaxial type and waveguide type equalizers are suitable for equalization of high-power circuits due to their large volume and generally mechanical tuning. However, the integrated transmission line type equalizer has limited application scope because of its inflexible or difficult tuning.

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

[0004] To overcome the above technical problems, the present invention provides an electrically tunable amplitude equalizer and a control system, which can achieve broadband reflectionless and variable equalization slope, and are suitable for various signal processing scenarios.

[0005] To solve the above technical problems, a first aspect of the present invention discloses an electrically tunable amplitude equalizer, including: a symmetric network module, a matching module, an electrically tunable attenuation module, a signal input / output module, and a voltage control terminal;

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

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

[0008] The signal input / 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 symmetric network module, the electrically tunable attenuation module, and the matching module.

[0009] In some embodiments, the matching module further includes a matching inductor L8, a matching inductor L9, and a switching transistor MOS1; the voltage control terminal further includes a fourth control terminal, and the voltage through the fourth control terminal controls the equivalent inductance of the matching inductor L8 and the matching inductor L9 through the switching transistor MOS1 to adjust the impedance of the matching module.

[0010] In some embodiments, the matching capacitor includes a capacitor C4, a capacitor C5, and a varactor diode; 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 capacitance value of the varactor diode is controlled through the first control terminal, thereby adjusting the impedance of the LC matching network.

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

[0012] In some embodiments, the symmetric network module includes a capacitor C1, a capacitor C2, a capacitor C3, an inductor L1, and an inductor L2, and the capacitor C1 and the inductor L1, L2 form an LC loop; the capacitor C2, C3 and the inductor L1, L2 form a symmetric 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 resistances of the diode PIN1, the diode PIN2, and the diode PIN3 are

[0015]

[0016] where A is the attenuation amount, in decibels, and Z 0 is the port impedance of the electrically tunable amplitude equalizer.

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

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

[0019]

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

[0021]

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

[0023]

[0024] where Z 0 is the port impedance of the electronically tunable amplitude equalizer, and ω 0 is the center angular frequency of the electronically tunable amplitude equalizer.

[0025] In some embodiments, it further includes a first low-pass module, a second low-pass module and a 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.

[0026] According to a second aspect of the present invention, an electronically tunable amplitude equalizer control system is disclosed, including:

[0027] The control module is connected to the 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 electronically tunable attenuation module of any one of the above-mentioned electronically tunable amplitude equalizers through the voltage control end.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] The present invention provides an electronically tunable amplitude equalizer and a control system. By integrating a symmetric network, a matching module and an electronically tunable attenuation module, and precisely adjusting the matching capacitor and the tunable impedance device through the voltage control end, it realizes 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 is the circuit schematic diagram of the electronically tunable amplitude equalizer provided by the present invention;

[0031] Figure 2 is the structural schematic diagram of the electronically tunable amplitude equalizer provided by the present invention;

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

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

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

[0035] Figure 6 The broadband reverse transmission loss curve provided by the present invention. Detailed implementation manners

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

[0037] The terms "include" and "have" in the embodiments of the present invention and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or modules does not necessarily limit to those clearly listed steps or modules, but may include other steps or modules not clearly listed or inherent to these processes, methods, products or devices.

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

[0039] As Figure 1 shown, the electrically tunable amplitude equalizer includes a symmetric network module, a matching module, an electrically tunable attenuation module, a signal input / output module and a voltage control terminal; the voltage control terminal includes a first control terminal, a second control terminal and a third control terminal, the matching module includes a matching capacitor, the first control terminal is connected to the matching capacitor, and the capacitance value of the matching capacitor is adjusted by the voltage of the first control terminal; the electrically tunable attenuation module includes a tunable impedance device; the bias voltage of the controllable impedance device is adjusted by the voltages of the second control terminal and the third control terminal to control the attenuation amount of the electrically tunable attenuation module; the signal input / 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 symmetric network module, the electrically tunable attenuation module and the matching module.

[0040] As Figure 2 shown, a first low-pass module, a second low-pass module and a 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 symmetric network module, the electrically tunable attenuation module and the matching module.

[0041] The symmetric network module includes capacitor C1, capacitor C2, capacitor C3, inductor L1, and inductor L2. Capacitor C1 and inductors L1 and L2 form an LC circuit; capacitors C2, C3 and inductors L1, L2 form a symmetric LC network. The symmetric network structure is used to achieve broadband non-reflection characteristics. The input signal enters from the first port, passes through the symmetric LC network composed of capacitors C1, C2, C3 and inductors L1, L2, passes through the electrically tunable attenuation module and the matching module, and finally outputs from the second port. The symmetric 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 adjustment of the signal slope can be achieved while maintaining the non-reflection characteristics within a wide frequency band. This setting of the symmetric network enables the electrically tunable amplitude equalizer to efficiently and precisely adjust the signal, and is applicable to various application scenarios that require precise frequency response adjustment.

[0042] Specifically, in the symmetric network module, capacitors C1, C2, C3 are respectively:

[0043]

[0044] Inductors L1, L2 are:

[0045]

[0046] Among them, Z 0 is the port impedance of the electrically tunable amplitude equalizer, and ω 0 is the center angular frequency of the electrically tunable amplitude equalizer.

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

[0048] Such as Figure 1As shown in the figure, the adjustable impedance device in this application includes diode PIN1 and diode PIN2. Diode PIN1 and diode PIN2 are connected in series. The bias voltage of diode PIN1 is adjusted through the second control terminal, and the bias voltage of diode PIN2 is adjusted through the third control terminal. The second control terminal is connected to the cathode of diode PIN1, and the third control terminal is connected to the cathode of diode PIN2. By adjusting the voltages of the second control terminal and the third control terminal, the conduction states and equivalent resistances of diode PIN1 and diode PIN2 are controlled, and the attenuation of the signal is adjusted. In this application, the series-arm impedance uses two PIN diodes connected in reverse. Using two PIN diodes instead of one PIN diode can increase the attenuation amount or double the upper limit of the operating frequency. Since the series resistances of the twin diodes have a 180-degree phase difference, even-order distortion can be cancelled. Moreover, a symmetric attenuation network and a relatively simple bias circuit are obtained through two PIN diodes connected in reverse.

[0049] It further includes diode PIN3. Diode PIN3 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 potential of the intermediate node of the electrically tunable attenuation module, and further affects the attenuation amount of the entire electrically tunable amplitude equalizer. Diode PIN3 usually works in cooperation with diode PIN1 and diode PIN2 to jointly determine the total attenuation amount of the electrically tunable attenuation module. By adjusting diode PIN3, while keeping the fixed biases of diode PIN1 and diode PIN2, fine control of the attenuation amount can be achieved, which can effectively reduce the non-linear distortion in high-frequency signal processing of the electrically tunable attenuation module and improve the linearity and stability of the circuit.

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

[0051] Diodes PIN1, PIN2, and PIN3 form a T-type attenuator, and its equivalent resistance is

[0052]

[0053] where A is the attenuation amount, with the unit of decibel, and Z 0 is the port impedance of the electrically tunable amplitude equalizer.

[0054] In some embodiments, the PIN diode is replaced by an FET (field-effect transistor). By adjusting the gate voltage of the FET, the on-resistance between the drain and the source is controlled, thereby adjusting the attenuation of the signal. The on-resistance of the FET changes at different gate voltages, thus affecting the degree of signal passage. Compared with the PIN diode, the FET can control the on-resistance more precisely and is suitable for applications that require high linearity or low distortion. It can be applied to circuits such as low-noise amplifiers, mixers, and modulators, especially in radio frequency circuits with high requirements for linearity and noise.

[0055] This electronically tunable amplitude equalizer further includes a matching module. The matching module adjusts the input and output impedances of the circuit to match them with the impedances of the front and rear stage circuits or systems, thereby achieving optimal power transfer and signal integrity, ensuring the maximization of the signal transmission efficiency in the circuit, and minimizing signal reflection and loss at the same time. The matching module includes a matching inductor L8, a matching inductor L9, and a switching transistor MOS1; the voltage control terminal further includes a fourth control terminal V4. The voltage at the fourth control terminal controls the equivalent inductance of the matching inductor L8 and the matching inductor L9 through the switching transistor MOS1 to adjust the impedance of the matching module. The fourth control terminal V4 controls the switching transistor MOS1, thereby adjusting the equivalent inductance of the matching inductor L8 and the matching inductor L9. When the switching transistor MOS1 is fully turned on, a larger current is allowed to flow through. The matching inductor L8 and the matching inductor L9 are connected in parallel to form a combined inductor. The equivalent inductance of the parallel inductor is less than that of the individual matching inductor L8 or the matching inductor L9, which is suitable for processing higher-frequency signals. On the contrary, when the switching transistor MOS1 is turned off, it is equivalent to an open circuit. The matching inductor L8 is in the working state, and the matching inductor L9 does not participate in the circuit operation. The equivalent inductance value is the inductance of L8, which is suitable for processing lower-frequency signals.

[0056] Furthermore, multiple switching transistors MOS can be introduced into the matching module to separately control the connection states of multiple inductors, realizing more types of inductor combinations, enabling a wider adjustment range of the equivalent inductance, and being able to adapt to a wider frequency bandwidth requirement. For example, in the single inductor mode: when all the switching transistors are turned off, only the matching inductor L8 is in the working state and the inductance is the largest. In the parallel inductor mode: when the switching transistors are turned on one by one, the matching inductor L8 can be connected in parallel with other matching inductors L9 and L10, making the total inductance gradually decrease to adapt to the signal processing of higher frequency bands. By selecting an appropriate matching inductor combination, the frequency response of the circuit can be precisely adjusted without increasing the additional hardware complexity, meeting various application requirements.

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

[0058] The anode of the varactor diode is connected to the low potential terminal or grounded, and the cathode is connected to the applied control voltage, that is, the first control terminal. When the applied reverse bias voltage increases, the junction capacitance of the varactor diode will decrease; conversely, when the reverse bias voltage decreases, the junction capacitance will increase. The varactor diode is connected in parallel with capacitor C4 and capacitor C5, or connected in series / parallel with matching inductor L8 and matching inductor L9 to form an LC matching network. The varactor diode is a special diode whose capacitance value can be adjusted by the applied voltage at the first control terminal. By changing the voltage applied to the varactor diode, its capacitance value is dynamically adjusted, and the impedance of the matching module is finely tuned, so as to further optimize the impedance matching and frequency response characteristics of the circuit, enabling the circuit to dynamically adapt to different operating frequencies.

[0059] By adjusting the equivalent inductance of matching inductor L8 and matching inductor L9, the two modes of narrowband and broadband are switched. 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 finely adjusted to improve the slope of this equalizer.

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

[0061] Furthermore, the present electronic amplitude equalizer further includes a plurality of bias inductors, bias resistors, and DC-blocking capacitors, which are connected to the controllable impedance device for controlling the bias voltage of the impedance device and isolating AC signals and DC bias simultaneously to ensure that the device can operate normally without interfering with signal transmission. The bias inductors include inductor L3, inductor L4, inductor L5, inductor L6, and inductor L7. The bias resistors include resistor R1, resistor R2, resistor R3, resistor R4, and resistor R5. The DC-blocking capacitors include capacitor C6, capacitor C7, and capacitor C8, which isolate AC signals, stabilize signal transmission, and maintain the integrity and stability of the signals. The bias inductors and bias resistors cooperate in the electronic amplitude equalizer to ensure that the active device obtains a stable DC bias current, while effectively isolating AC signals and DC bias 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 bias.

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

[0063] As Figure 3 、 4 shown in Figures 5 and 6, its horizontal axis is frequency with the unit of GHz, and the vertical axis is the forward transmission coefficient, where Figure 3 is the narrowband forward transmission loss curve graph. In the forward transmission loss graph, as the frequency increases from 600 MHz to 1 GHz, the loss of S21 rapidly decreases from -1.707 dB to nearly -0.388 dB, indicating that the insertion loss rapidly decreases as the frequency increases, and the rate of this change is the slope. This significant change in insertion loss brought about by the frequency change indicates that the equalizer has a large slope when set to narrowband. Within the equalization 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, enabling the equalizer to effectively compensate for the attenuation of the signal within the set equalization frequency band and maintain better transmission quality.

[0064] Figure 4It is the reverse transmission loss curve graph for the narrowband. The smaller the reflection coefficient S11, the smaller the reflection loss, that is, the better the signal transmission matching, and the less the reflected energy. In the low-frequency band, such as around 600 MHz, it shows a relatively large reflection loss, about -35 dB, indicating that at 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 still maintains good matching characteristics. Outside the equalization frequency band, the S21 and S11 curves tend to be flat, showing that the frequency response of the equalizer outside the narrowband is relatively stable, especially suitable for scenarios that only require in-band local equalization, such as compensating for the high-frequency band fading of an amplifier to broaden its working bandwidth.

[0065] Figure 5 、 Figure 6 It is the forward transmission loss curve and the reverse transmission loss curve graph for the broadband. Within the broadband, as the frequency increases, the transmission loss of the signal decreases rapidly, showing a large slope. This equalizer can effectively compensate for the low-frequency attenuation within the broadband range, enabling the signal to maintain a stable transmission effect.

[0066] The present invention provides a voltage-controlled amplitude equalizer and a control system. By integrating a symmetric network, a matching module, and a voltage-controlled attenuation module, and precisely adjusting the matching capacitor and the adjustable impedance device through a voltage control terminal, it realizes variable slope, adjustable equalization bandwidth, flexible attenuation control, and wide application adaptability. It 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 elaborated 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 for communicating with other devices or communication networks to receive or send network messages;

[0071] a bus for connecting the memory, the processor, and the transceiver for internal communication.

[0072] The transceiver receives the messages transmitted on the network, transfers them to the processor through the bus. The processor calls the executable program code stored in the memory through the bus for processing, and transfers the processing result to the transceiver through the bus for sending, thereby implementing the method provided by the embodiments of the present application.

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

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

[0076] The embodiments described above are merely illustrative. The modules described as separate components may or may not be physically separated. The components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed to multiple network modules. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. A person of ordinary skill in the art can understand and implement it without creative labor.

[0077] Through the specific descriptions of the above embodiments, those skilled in the art can clearly understand that each embodiment 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 solutions, in essence, or the parts that contribute to the prior art can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, which includes read-only memory (ROM), random access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), one-time programmable read-only memory (OTPROM), electrically-erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc memories, magnetic disk memories, tape memories, or any other computer-readable medium capable of carrying or storing data.

[0078] Finally, it should be noted that: The disclosed embodiments of the present invention are only the preferred embodiments of the present invention, and 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 foregoing embodiments, those of ordinary skill in the art should understand that: They can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; And these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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, a third control end, and a fourth control end. The matching module includes a matching capacitor, and the matching capacitor includes a capacitor C4, a capacitor C5, and a varactor. The first control end is connected to the cathode of the varactor and the second end of the capacitor C5 through a resistor R5 and an inductor L3, and the capacitance value of the matching capacitor is adjusted by the voltage of the first control end; the anode of the varactor and the first end of the capacitor C5 are coupled to the second port of the signal input and output module; the first end of the capacitor C4 is connected to the second end of the capacitor C5; and the second end of the capacitor C4 is coupled to the first port of the signal input and output module; The matching module also includes a switch tube MOS1, a matching inductor L8, and a matching inductor L9. The fourth control terminal is connected to the gate of the switch tube MOS1. The drain of the switch tube MOS1 is grounded through the matching inductor L9 and the matching inductor L8. The source of the switch tube MOS1 is grounded, and the common end of the matching inductor L8 and the matching inductor L9 is connected to the anode of PIN3. 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 controllable impedance device includes PIN1, PIN2 and PIN3, PIN1 and PIN2 are connected in reverse series, the second control terminal is connected to the anode of PIN1 through a resistor R1 and an inductor L6, the cathode of PIN1 is connected to the second end of the capacitor C4, the third control terminal is connected to the anode of PIN2 through a resistor R2, an inductor L7 and a capacitor C6, the cathode of PIN2 is connected to the first end of the capacitor C5, and the cathode of PIN3 is connected to the common end of PIN2 and PIN1 through the capacitor C6; The signal input and output module includes a first port and a second port. The first port is connected to the symmetrical network module through a capacitor C7, and the second port is connected to the symmetrical network module through a capacitor C8. 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.

2. The electrically adjustable amplitude equalizer according to claim 1, characterized in that: 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.

3. The electrically adjustable amplitude equalizer according to claim 1, 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.

4. The electrically adjustable amplitude equalizer according to claim 3, 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.

5. 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.

6. 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 1-5 through the voltage control end.

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