CN111525239B

CN111525239B - Variable capacitance control circuit, antenna module and electronic equipment

Info

Publication number: CN111525239B
Application number: CN202010436487.3A
Authority: CN
Inventors: 彭雄辉
Original assignee: Oppo Chongqing Intelligent Technology Co Ltd
Current assignee: Oppo Chongqing Intelligent Technology Co Ltd
Priority date: 2020-05-21
Filing date: 2020-05-21
Publication date: 2021-09-14
Anticipated expiration: 2040-05-21
Also published as: CN111525239A

Abstract

The utility model relates to a variable capacitance control circuit, antenna module and electronic equipment, including the signal transmission module, power management module and a plurality of control module, when the signal transmission module is connected with outside radio frequency front end module, receive and handle the radio frequency signal of radio frequency front end module output, power management module carries out the pressure regulating according to radio frequency signal to mains voltage and handles and obtain adjustment voltage, every control module regards adjustment voltage as supply voltage, handle radio frequency signal under the control of adjustment voltage and obtain corresponding control voltage in order to adjust variable capacitance's capacitance value. Therefore, the signal transmission module, the power management module and the control modules can control the variable capacitors, and each control module can independently control the variable capacitor of each channel to adjust the capacitance value; meanwhile, the control voltage range of each control module can be adjusted for multiple times, so that the capacitance value range of the variable capacitor is enlarged.

Description

Variable capacitance control circuit, antenna module and electronic equipment

Technical Field

The present application relates to the field of antenna technology, and in particular, to a variable capacitance control circuit, an antenna module, and an electronic device.

Background

With the continuous development of the mobile phone market, a full-screen mobile phone becomes a trend, and more users pursue not only a large screen of the mobile phone but also smaller screen shielding, namely a high screen occupation ratio. When designing a mobile phone with a high screen ratio, the space of an antenna clearance area is continuously compressed, and in order to ensure the performance of the antenna, mobile phone manufacturers generally use a variable capacitor to tune the impedance of the antenna and tune the resonance of the antenna.

However, in the conventional mobile phone antenna module, only one variable capacitor can be controlled to work independently, and the variable capacitor has a small capacitance range, which limits the use of the antenna.

Disclosure of Invention

The embodiment of the application provides a variable capacitance control circuit, an antenna module and electronic equipment, which can simultaneously control a plurality of different variable capacitances to work, and the capacitance range of the variable capacitance is adjustable, so that the application range of the antenna module is expanded.

A variable capacitance control circuit comprising:

the signal transmission module is used for receiving and processing the radio frequency signal output by the radio frequency front end module when being connected with the external radio frequency front end module;

the power supply management module is connected with the signal transmission module and used for receiving power supply voltage input by a power supply and carrying out voltage regulation processing on the power supply voltage according to the radio frequency signal to obtain regulated voltage; and

each control module is respectively connected with the signal transmission module, the power management module and the variable capacitor, and is used for processing the radio-frequency signal under the control of the adjustment voltage to obtain a corresponding control voltage which is used for adjusting the capacitance value of the variable capacitor.

An antenna module, comprising:

a plurality of variable capacitances;

the circuit as described above, connected to a plurality of the variable capacitors, and configured to output the corresponding control voltage to the variable capacitors to adjust capacitance values of the variable capacitors;

and the antenna unit is connected with the variable capacitor, and the resonant frequency of the antenna unit is controlled by the capacitance value of the variable capacitor.

Further, there is provided an electronic device including: the antenna module comprises a shell and the antenna module, wherein the antenna module is accommodated in the shell.

The variable capacitor control circuit comprises a signal transmission module, a power management module and a plurality of control modules, wherein when the signal transmission module is connected with an external radio frequency front end module, the signal transmission module receives and processes radio frequency signals output by the radio frequency front end module, the power management module regulates the power voltage input by a power supply according to the radio frequency signals to obtain regulated voltage, each control module takes the regulated voltage as power supply voltage, and the radio frequency signals are processed under the control of the regulated voltage to obtain corresponding control voltage so as to regulate the capacitance value of the variable capacitor. Therefore, the signal transmission module, the power management module and the control modules can control the variable capacitors, and each control module can independently control the variable capacitor of each channel to adjust the capacitance value; meanwhile, the control voltage range of each control module can be adjusted for multiple times, so that the capacitance value range of the variable capacitor is enlarged.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a perspective view of an electronic device in one embodiment;

FIG. 2 is a schematic diagram of an embodiment of a variable capacitance control circuit;

FIG. 3 is a schematic diagram of an embodiment of a variable capacitance control circuit;

FIG. 4 is a schematic diagram of a signal transmission module according to an embodiment;

FIG. 5 is a diagram illustrating an exemplary power management module;

FIG. 6 is a block diagram of a control module according to an embodiment;

FIG. 7 is a circuit diagram of an embodiment of a variable capacitance control circuit;

FIG. 8 is a circuit diagram of an embodiment of a variable capacitance control circuit;

fig. 9 is a schematic structural diagram of an antenna module according to an embodiment;

fig. 10 is a front view of a housing assembly of the electronic device of fig. 1 in another embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element, and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

The variable capacitor control circuit of an embodiment of the present application is applied to an antenna module, and the antenna module further includes a plurality of variable capacitors and an antenna unit. The variable capacitance control circuit is connected with the variable capacitors and used for outputting corresponding control voltage to the variable capacitors so as to adjust the capacitance values of the variable capacitors; the antenna unit is connected with the variable capacitor, and the resonant frequency of the antenna unit is controlled by the capacitance value of the variable capacitor.

The antenna module of this application embodiment is applied to electronic equipment, and in an embodiment, electronic equipment can be for including cell-phone, panel computer, notebook computer, palmtop computer, Mobile Internet Device (MID), wearable equipment (for example intelligent wrist-watch, intelligent bracelet, pedometer etc.) or other communication module that can set up the antenna module.

In an embodiment of the present application, as shown in FIG. 1, the electronic device 10 may include a display screen assembly 110, a housing assembly 120, and a controller. The display screen assembly 110 is fixed to the housing assembly 120, and forms an external structure of the electronic device together with the housing assembly 120. The housing assembly 120 may include a center frame and a rear cover. The middle frame can be a frame structure with a through hole. The middle frame can be accommodated in an accommodating space formed by the display screen assembly and the rear cover. The back cover is used to form the outer contour of the electronic device. The rear cover may be integrally formed. In the forming process of the rear cover, structures such as a rear camera hole, a fingerprint identification module, an antenna module mounting hole and the like can be formed on the rear cover. Wherein, the back lid can be behind the nonmetal lid, for example, the back lid can be behind the plastic lid, the lid behind the pottery, the lid behind the 3D glass etc.. The controller can control the operation of the electronic device, etc. The display screen component can be used for displaying pictures or fonts and can provide an operation interface for a user.

In an embodiment, an antenna module is integrated in the housing component 120, and the antenna module can transmit and receive an antenna signal through the housing component 120, so that the electronic device can achieve wide coverage of the antenna signal.

As shown in fig. 2, an embodiment of the present application provides a variable capacitance control circuit 20, where the variable capacitance control circuit 20 includes a signal transmission module 210, a power management module 220, and a plurality of control modules 230 (only one control module and one variable capacitor are shown in fig. 2).

The signal transmission module 210 is configured to receive and process a radio frequency signal of the radio frequency front-end module 21 when connected with the external radio frequency front-end module 21.

And the power management module 220 is connected to the signal transmission module 210, and is configured to receive a power voltage input by a power supply, and perform voltage regulation processing on the power voltage according to the radio frequency signal to obtain a regulated voltage.

Each control module 230 is connected to the signal transmission module 210, the power management module 220, and the variable capacitor 22, and each control module 230 is configured to use the adjustment voltage as a power supply voltage, process the radio frequency signal under the control of the adjustment voltage to obtain a corresponding control voltage, where the control voltage is used to adjust a capacitance value of the variable capacitor 22.

In this embodiment, the input end of the signal transmission module 210 is connected to the output end of the external rf front-end module 21 to receive and process the rf signal of the rf front-end module 21, and the output end of the signal transmission module 210 is respectively connected to the power management module 220 and the plurality of control modules 230 to output the rf signal to the power management module 220 and the plurality of control modules 230.

The rf front-end module 21 is a control terminal outside the circuit, and is configured to generate a radio frequency signal to control the variable capacitor circuit to generate a control voltage corresponding to the radio frequency signal, so as to control the variable capacitor 22 to adjust the capacitance value. The radio frequency signals include clock signals and data signals.

The clock signal is used in the variable capacitance control circuit 20 to update the output state of each module of the timing control circuit, the frequency of the clock signal plays a role in synchronization in the circuit, when the signals are synchronized, each module in the circuit correspondingly changes the output state according to the data signal, and when the frequency of the clock signal is optimally adjusted, the working frequency of the circuit can be optimized.

The data signal includes voltage information and output channel selection information, and the signal transmission module 210 may transmit the data signal to the power supply regulation module and the corresponding control module 230 according to the output channel selection information in the data signal; when the data signal is received by the power management module 220, the power management module 220 performs voltage regulation processing on the power voltage according to the voltage information of the data signal to obtain a regulated voltage; when the data signal is received by the control module 230, the control module 230 processes the voltage information of the data signal under the control of the supply voltage to obtain the control voltage.

In one embodiment, the processing procedure of the rf signal by the signal transmission module 210 includes level-converting the data signal under the timing control of the clock signal to make the level value of the data signal suitable for the operating voltage of the circuit; in another embodiment, the process further comprises adjusting a frequency range of the clock signal to optimize an operating frequency of the circuit.

In this embodiment, the power management module 220 is connected to an external power source to input a power voltage, and is connected to the signal transmission module 210 to input a radio frequency signal, and performs a voltage regulation process on the power voltage according to voltage information in the radio frequency signal to obtain a regulated voltage to provide a required power supply voltage for each control module 230, so that the control module 230 processes the radio frequency signal under the control of the power supply voltage to obtain a control voltage for controlling the variable capacitor 22 to regulate the capacitance value. Since the power supply voltage of the control module 230 can be continuously adjusted by the power management module 220, the control voltage range of the control module 230 can be adjusted under the adjustment of the power supply voltage, so that the capacitance range of the variable capacitor 22 can be correspondingly adjusted, and the capacitance range can be enlarged.

In an embodiment, when the control module 230 needs to process the rf signal under the control of a higher voltage, the power management module 220 performs a voltage regulation process on the power voltage to perform a voltage boosting process, so that the power management module 220 boosts the power voltage through the voltage boosting process under the control of the rf signal to obtain a regulated voltage to supply power to the control module 230.

In the present embodiment, a plurality of control modules 230 constitute a plurality of control channels of the variable capacitance control circuit 20, and the number of control channels is determined according to the number of variable capacitances 22 to be controlled. Each control module 230 is connected to the signal transmission module 210, the power management module 220 and the variable capacitor 22, and each control module 230 can input a data signal of the signal transmission module 210 and an adjustment voltage of the power management module 220, and process the data signal under the control of the adjustment voltage to obtain a corresponding control voltage. The plurality of variable capacitors 22 can be controlled by the plurality of control modules 230, and each control module 230 can independently adjust the capacitance value of the variable capacitor 22 of each channel; and the control voltage range of each control module 230 may be adjusted multiple times to increase the capacitance range of the corresponding variable capacitor 22.

In one embodiment, the processing of the data signal by the control module 230 includes performing digital-to-analog conversion on the data signal, converting the data signal into an analog signal in a voltage mode, and obtaining a corresponding control voltage after the analog signal is processed by the operational amplifier to control the variable capacitor 22 to adjust the capacitance value.

In one embodiment, the control module 230 performs different conversion and operational amplifier processing on the data signal, so that the control circuit has different operation modes. Illustratively, the working modes include a shutdown mode, a startup mode, an active mode and a low power consumption mode, wherein the capacitance value of the variable capacitor 22 is the largest and is at a fixed capacitance value when the shutdown mode is set; in the start-up mode, the capacitance of the variable capacitor 22 is minimum; in the active mode, the variable capacitor 22 fluctuates in the full range section, and the corresponding power consumption is large; in the low power consumption mode, the capacity value fluctuation is small, and the corresponding power consumption is small.

The variable capacitance control circuit 20 provided in this embodiment includes a signal transmission module 210, a power management module 220, and a plurality of control modules 230, when the signal transmission module 210 is connected to an external rf front-end module 21, the signal transmission module receives and processes an rf signal of the rf front-end module 21, the power management module 220 performs voltage regulation processing on a power voltage according to the rf signal to obtain a regulated voltage, each control module 230 uses the regulated voltage as a power supply voltage, and processes the rf signal under the control of the regulated voltage to obtain a corresponding control voltage to regulate a capacitance value of the variable capacitance 22. Therefore, the signal transmission module 210, the power management module 220 and the control modules 230 can control the variable capacitors 22, and each control module 230 can independently adjust the capacitance of the variable capacitor 22 of each channel; meanwhile, the control voltage range of each control module 230 can be adjusted multiple times, so that the capacitance range of the variable capacitor 22 is increased.

As shown in fig. 3, in the present embodiment, another variable capacitance control circuit 30 is provided, where the variable capacitance control circuit 30 includes a signal transmission module 310, a power management module 320, a plurality of control modules 330 (only one control module and one variable capacitor is shown in fig. 3, where 31 is a radio frequency front end module, and 32 is a variable capacitor), a voltage acquisition module 340, and a reset module 350.

In this embodiment, the relevant descriptions of the signal transmission module 310, the power management module 320 and the control module 330 refer to the corresponding descriptions of the above embodiments, and are not repeated herein.

In this embodiment, the voltage collecting module 340 is connected to the signal transmission module 310, and is configured to collect the operating voltage of the signal transmission module 310.

In this embodiment, the reset module 350 is connected to the voltage acquisition module 340, and is configured to perform a reset process on the circuit when the operating voltage is greater than the voltage threshold.

The working voltage of the signal transmission module 310 is collected by the voltage collection module 340, so that the working voltage of the control circuit is obtained, and then the reset module 350 compares the working voltage with the voltage threshold value, so that whether the control circuit is in a normal working voltage range can be judged, and when the working voltage of the control circuit exceeds the voltage threshold value, the control circuit is judged to be in an abnormal working condition, so that the control circuit is reset, and the control circuit is restarted. In this case, the reset process may be reset by a level, for example, a high level reset.

Referring to fig. 4, fig. 4 is a structural diagram of a signal transmission module in the corresponding embodiment. For convenience of explanation, only the parts related to the embodiments of the present invention are shown, and detailed as follows:

in one embodiment, the signal transmission module includes a level conversion unit 401 and a register unit 402.

The level shift unit 401 is configured to receive a clock signal and a data signal when connected to the rf front-end module, and perform level shift on the data signal under the control of the clock signal.

And a register unit 402, connected to the level conversion unit 401, the power management module and the control module, respectively, for receiving, storing and transmitting the level-converted data signal under the timing control of the clock signal.

A first input end of the level conversion unit 401 is connected to a clock port of the rf front-end module to receive a clock signal, a second input end of the level conversion unit 401 is connected to a data port of the rf front-end module to receive a data signal, an output end of the level conversion unit 401 is connected to the register unit 402, a first output end of the register unit 402 is connected to the power management module to output the data signal to the power management module, and a second output end of the register unit 402 is connected to the control module to output the data signal to the control module. The level conversion unit 401 performs level conversion on the data signal under the control of the clock signal to convert the voltage carried in the data signal into a voltage range in which the circuit can operate; the converted data signal is transmitted and stored through the register unit 402.

In one embodiment, referring to fig. 4, the signal transmission module further includes a phase-locked loop unit 403.

And a phase-locked loop unit 403 connected between the level conversion unit 401 and the register unit 402, for processing the clock signal to adjust the frequency range of the clock signal.

Specifically, the phase-Locked loop unit 403 is a pll (phase Locked loop) circuit, and after the level conversion unit 401 performs level conversion on the data signal, further integrates the clock signal, adjusts the frequency range of the clock signal, and optimizes the operating frequency of the circuit.

In one embodiment, referring to fig. 4, the signal transmission module further includes a first filtering unit 404.

The first filtering unit 404 is connected to the rf front-end module and the level conversion unit 401, respectively, and is configured to filter the rf signal, so as to filter out a clutter signal in the rf signal.

Referring to fig. 5, fig. 5 is a structural diagram of a power management module in the above embodiment. For convenience of explanation, only the parts related to the embodiments of the present invention are shown, and detailed as follows:

in one embodiment, referring to fig. 5, the power management module includes a first digital-to-analog conversion unit 501 and a power regulation unit 502.

The first digital-to-analog conversion unit 501 is connected to the register unit, and is configured to receive the data signal and perform digital-to-analog conversion on the data signal to output a first analog signal.

And the power supply adjusting unit 502 is respectively connected with the first digital-to-analog converting unit 501 and each control module, and is configured to perform voltage regulation processing on the power supply voltage according to the first analog signal, obtain a regulated voltage, and output the regulated voltage to the control modules.

The first digital-to-analog conversion unit 501 is connected to the register unit to receive the data signal and convert the received data signal into a first analog signal, where the first analog signal is used to control the power supply adjustment unit 502 to adjust the voltage of the power supply. The power supply adjusting unit 502 is connected to the power supply, the first digital-to-analog converting unit 501 and each control module, and outputs different adjusting voltages to meet the power supply requirement of the control module under the control of the first analog signal.

In one embodiment, referring to fig. 5, the power management module further includes a second filtering unit 503.

And a second filtering unit 503, connected between the power supply 500 and the power supply adjusting unit 502, for performing filtering processing on the power supply voltage to filter out low-frequency interference that may exist when the power supply supplies power.

In one embodiment, referring to fig. 5, the power management module further includes a discharging unit 504.

And the discharging unit 504 is respectively connected with the power supply and power supply regulating unit 502 and is used for performing discharging processing when the power supply management module stops working so as to improve the safety performance of the circuit.

In one embodiment, referring to fig. 5, the power management module further includes a voltage stabilizing unit 505.

And the voltage stabilizing unit 505 is connected with the power supply adjusting unit 502 and the control module respectively, and is used for performing voltage stabilizing processing on the adjusted voltage and improving the stability of the adjusted voltage.

Referring to fig. 6, fig. 6 is a structural diagram of a control module in the corresponding embodiment. For convenience of explanation, only the parts related to the embodiments of the present invention are shown, and detailed as follows:

in an embodiment, as shown in fig. 6, each control module includes a second digital-to-analog conversion unit 601 and a power amplifier unit 602.

The second digital-to-analog conversion unit 601 is connected to the register unit, and is configured to receive the data signal and perform digital-to-analog conversion on the data signal to output a second analog signal.

And the power amplifier unit 602 is respectively connected to the power management module, the second digital-to-analog conversion unit 601 and the variable capacitor, and is configured to amplify and filter the second analog signal under the limitation control of the power supply voltage to obtain a control voltage, with the adjusted voltage serving as the power supply voltage.

Specifically, the register unit outputs data signals corresponding to the voltage values to the control modules, and the second digital-to-analog conversion module performs digital-to-analog conversion on the data signals corresponding to the input voltage values to obtain second analog signals corresponding to the voltage values. The power amplifier unit 602 inputs the power supply voltage provided by the power management module, and simultaneously inputs the second analog signal input by the second digital-to-analog conversion unit 601, and after performing high-voltage amplification and filtering processing on the second analog signal under the control of the power supply voltage, obtains the control voltage required by the corresponding channel to control the variable capacitor of the corresponding channel to adjust the capacitance value. Therefore, the capacitance values of the variable capacitors can be independently controlled through the multipath channel, and the control voltage range and the capacitance value range of the variable capacitors can be improved through integrating multipath digital-to-analog conversion and power amplification circuits.

In one embodiment, as shown in FIG. 6, each control module includes an overvoltage protection unit 603.

The overvoltage protection unit 603 is connected to each power amplifier unit 602 and the variable capacitor corresponding to the power amplifier unit 602 in common, and is configured to perform overvoltage protection on the variable capacitor, so that damage to the variable capacitor due to an excessive control voltage can be prevented.

Referring to fig. 7, fig. 7 is a circuit schematic diagram of the variable capacitance control circuit corresponding to the embodiment of fig. 4-6 based on fig. 2. For convenience of explanation, only the parts related to the embodiments of the present invention are shown, and detailed as follows:

illustratively, in the signal transmission module 210: the level converting unit is a level converter Ls, the registering unit is a register Re, and the first filtering unit comprises a capacitor C1 and a capacitor C2.

The first input end of the level shifter Ls, the clock port of the radio frequency front end module and the first end of the capacitor C1 are connected in common, the second end of the capacitor C1 is grounded, the second input end of the level shifter Ls, the data end of the radio frequency front end module and the first end of the capacitor C2 are connected in common, the second end of the capacitor C2 is grounded, the input end of the register Re is connected with the output end of the level shifter Ls, the first output end of the register Re is connected with the power management module, and the second output end of the register Re is connected with the control module.

In a specific application, the capacitor C1 and the capacitor C2 can determine whether to be set according to an actual interference situation, and a 0201 capacitor bit is reserved in each capacitor.

Illustratively, in the power management module 220: the first digital-to-analog conversion unit comprises a first digital-to-analog converter DAC1, the power supply regulation unit comprises a booster B, an inductor L and a diode D, the second filtering unit comprises a resistor R1 and a capacitor C3, the second filtering unit further comprises a capacitor C4, the discharging unit comprises a resistor R2, and the voltage stabilizing unit comprises a capacitor C5.

The input end of the first digital-to-analog converter DAC1 is connected with the output end of the register Re, the output end of the first digital-to-analog converter DAC1 is connected with the input end of the booster B, the output end of the booster B is respectively connected with the first end of the inductor L and the anode of the diode D, the second end of the inductor L and the first end of the resistor R1 are commonly connected with the first end of the capacitor C3, the second end of the capacitor C3 is grounded, the second end of the resistor R1, the first end of the resistor R2 and the first end of the capacitor C4 are commonly connected with the power supply voltage VPH-PWR, the second end of the resistor R2 is grounded, the second end of the capacitor C4 is grounded, the cathode of the diode D and the first end of the capacitor C5 are commonly connected with the operational amplifier unit of the control module, and the second end of the capacitor C5 is grounded.

The first digital-to-analog converter DAC1 receives the data signal, performs digital-to-analog conversion on the data signal to obtain a first analog signal, outputs the first analog signal to the booster B, and performs boosting processing on the input power supply voltage VPH-PWR by a power supply regulation unit composed of the booster B, the inductor L and the diode D under the control of the first analog signal to obtain a regulated voltage VHV to supply power to the control module. The resistor R1, the capacitor C3 and the capacitor C4 filter the power supply voltage VPH-PWR to filter low-frequency interference possibly existing in the power supply process; the resistor R2 performs discharge treatment when the circuit stops working so as to improve the safety performance of the circuit; the capacitor C5 is used for stabilizing the regulated voltage and improving the stability of the regulated voltage.

In one embodiment, the first DAC1 is a 4-bit DAC (Digital to analog converter) and the target adjustment value of the adjustment voltage VHV is set between 13V and 52V, configured by the 4-bit DAC, stepped to 1V, in order to provide a control voltage between 0V and 48V to the variable capacitor. After the control circuit is started, the 4-bit DAC first configures the regulation voltage VHV at 24V by default. In order to avoid output voltage saturation and noise problems, it is necessary to set the supply voltage VHV to be greater than the control voltage obtained by the control module, for example, the regulation voltage VHV is at least 2V higher than the control voltage.

In a specific application, the inductor L recommends using inductors with inductance values of 15uH, DCR < 200mR, ISAT and IRMS ≥ 0.4A according to the working frequency range and the output level requirement of the booster B; the C value of the capacitor C3 is required to be 105 (the withstand voltage is required to be more than 6.3V, and the material is X5R or X7R); the capacitor C4 is 105 capacitors, has a withstand voltage value of more than 6.3V and is made of materials X5R or X7R; the capacitor C5 uses 473 capacitors, 50V or more withstand voltage, and is made of X5R or X7R.

In a specific application, the resistor R1 can be replaced by a magnetic bead with a characteristic curve with very low impedance at low frequency and high impedance at medium-high frequency, the filtering performance of the matched capacitor is better, and meanwhile, the short-circuit current can be increased. For example, the magnetic beads can be used in a size of 75-120 Ω @100M and a flow of 1A or more. Resistor R2 may be left empty, reserving the resistor location.

Illustratively, in the control module 230 (taking the control circuit including three control modules as an example): the three second digital-to-analog conversion units respectively comprise a second digital-to-analog converter DAC2, a second digital-to-analog converter DAC3 and a second digital-to-analog converter DAC4, the three power amplification units respectively comprise a high-voltage amplifier A1, a high-voltage amplifier A2 and a high-voltage amplifier A3, and the three overvoltage protection units respectively comprise a capacitor C6, a capacitor C7 and a capacitor C8.

The input end of each second digital-to-analog converter is connected with the register Re, the output end of each second digital-to-analog converter is connected with the first input end of the high-voltage amplifier, the second input end of the high-voltage amplifier is connected with the power management module, the output end of the high-voltage amplifier, the corresponding variable capacitor and the first end of the corresponding capacitor are connected in common, and the first end of the capacitor is grounded.

The power management module provides adjusting voltage for each high-voltage amplifier to control the amplification factor of the high-voltage amplifier, under the control of the adjusting voltage, each high-voltage amplifier performs linear amplification and filtering processing on a second analog signal output by the second digital-to-analog converter to obtain control voltage and adjust a capacitance value by using a variable capacitor, and each capacitor performs overvoltage protection on the corresponding variable capacitor.

In a specific application, each second digital-to-analog converter is a 7-bit-DAC, providing 128 stages of adjustability, with a step nominal value of 189mV per stage. The capacitor C6, the capacitor C7, and the capacitor C8 may determine whether a capacitor with a corresponding capacitance value needs to be set and selected according to an actual interference situation, for example, a voltage-withstanding capacitor with parameters of 33pF and 50V or more may be selected.

Through the setting of each module, unit and components and parts of this embodiment for the variable capacitance of variable capacitance control circuit control has ultra-wide appearance value debugging range (0.3pF ~ 10pF), compares traditional 0.58pF ~ 2.7pF and has very big advantage.

It should be noted that all the modules and units in all the above embodiments may be integrated on the same chip, or some units or even some components may be integrated on the chip, in an embodiment, referring to fig. 8, the level conversion unit, the register unit, the phase-locked loop unit, the first digital-to-analog conversion unit, the voltage booster, the second digital-to-analog conversion unit, and the power amplifier unit are integrated on the chip U, and other units and components are connected to pins of the chip U.

In the actual manufacturing of the circuit, in order to improve the performance of the circuit and reduce the layout space, decoupling filter capacitors which are mostly involved in the chip are arranged near each pin of the chip as much as possible; the circuit of power requires to walk to the input through the star, and power regulation unit follows minimum loop principle in order to reduce to external radiation interference, and the second filtering unit is placed as close as possible to power regulation unit's inductance L, realizes best filtering effect.

As shown in fig. 9, an antenna module 90 according to an embodiment of the present invention includes a plurality of variable capacitors 910 (only one variable capacitor and one antenna unit are shown), a variable capacitor control circuit 920 according to the above embodiment, and an antenna unit 930, wherein the variable capacitor control circuit 920 is connected to the plurality of variable capacitors 910, and is configured to output corresponding control voltages to the variable capacitors 910 to adjust capacitance values of the variable capacitors 910; the antenna unit 930 is connected to the variable capacitor 910, and the resonant frequency of the antenna unit 930 is controlled by the capacitance of the variable capacitor 910.

The antenna module provided by the embodiment comprises a plurality of variable capacitors, a variable capacitor control circuit and an antenna unit, wherein the variable capacitor control circuit can simultaneously control a plurality of different variable capacitors to work, and the capacitance value range of the variable capacitors is adjustable, so that the antenna module has a higher resonant frequency range, and the application range of the antenna module is expanded.

As shown in fig. 10, an electronic device according to an embodiment of the present application includes a housing and an antenna module according to any of the embodiments described above, where the antenna module is accommodated in the housing.

In one embodiment, the electronic device includes a plurality of antenna modules distributed on different sides of the housing. For example, the casing includes a first side 121 and a third side 123 disposed opposite to each other, and a second side 122 and a fourth side 124 disposed opposite to each other, the second side 122 is connected to one end of the first side 121 and one end of the third side 123, and the fourth side 124 is connected to the other end of the first side 121 and the other end of the third side 123. At least two of the first side 121, the second side 122, the third side 123 and the fourth side 124 are respectively provided with an antenna module. When the number of the antenna modules is 2, the 2 antenna modules are respectively located at the second side 122 and the fourth side 124, so that the overall size of the antenna module is reduced in the dimension in the non-scanning direction, and the antenna module can be placed on two sides of the electronic device.

The electronic device with the antenna module of any one of the embodiments can be suitable for receiving and transmitting antenna signals in a wider resonant frequency range, and the application range of the electronic device is expanded.

Any reference to memory, storage, database, or other medium used herein may include non-volatile and/or volatile memory. Suitable non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RM), which acts as external cache memory. By way of illustration and not limitation, RMs are available in a variety of forms, such as static RM (srm), dynamic RM (drm), synchronous drm (sdrm), double data rate sdrm (ddr sdrm), enhanced sdrm (esdrm), synchronous link (Synchlink) drm (sldrm), memory bus (Rmbus) direct RM (rdrm), direct memory bus dynamic RM (drdrm), and memory bus dynamic RM (rdrm).

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A variable capacitance control circuit, comprising:

the signal transmission module is used for receiving and processing the radio frequency signal output by the radio frequency front end module when being connected with the external radio frequency front end module; wherein the radio frequency signal comprises a clock signal and a data signal;

the power supply management module is connected with the signal transmission module and used for receiving power supply voltage input by a power supply and regulating the power supply voltage according to the voltage information of the data signal to obtain regulated voltage; and

each control module is respectively connected with the signal transmission module, the power management module and the variable capacitor, and is used for taking the adjusting voltage as a power supply voltage, processing the voltage information of the data signal under the control of the adjusting voltage to obtain a corresponding control voltage, and the control voltage is used for adjusting the capacitance value of the variable capacitor.

2. The circuit of claim 1, wherein the signal transmission module comprises:

the level conversion unit is used for receiving the clock signal and the data signal and carrying out level conversion on the data signal under the time sequence control of the clock signal when being connected with the radio frequency front end module;

and the registering unit is respectively connected with the level conversion unit, the power management module and the control module and is used for receiving the data signals after level conversion under the time sequence control of the clock signals and storing and transmitting the data signals.

3. The circuit of claim 2, wherein the signal transmission module further comprises:

and the phase-locked loop unit is connected between the level conversion unit and the register unit and is used for adjusting the frequency range of the clock signal.

4. The circuit of claim 2, wherein the signal transmission module further comprises:

and the first filtering unit is respectively connected with the radio frequency front-end module and the level conversion unit and is used for filtering the radio frequency signals.

5. The circuit of claim 2, wherein the power management module comprises:

the first digital-to-analog conversion unit is connected with the register unit and used for receiving the data signal and performing digital-to-analog conversion on the data signal to output a first analog signal;

and the power supply adjusting unit is respectively connected with the first digital-to-analog conversion unit and each control module and is used for carrying out voltage regulation processing on the power supply voltage according to the first analog signal to obtain the regulated voltage and outputting the regulated voltage to the control modules.

6. The circuit of claim 5, wherein the power management module further comprises:

and the second filtering unit is connected between the power supply and the power supply adjusting unit and is used for filtering the power supply voltage.

7. The circuit of claim 5, wherein the power management module further comprises:

and the discharging unit is respectively connected with the power supply and the power supply adjusting unit and is used for performing discharging treatment when the power supply management module stops working.

8. The circuit of claim 5, wherein the power management module further comprises:

and the voltage stabilizing unit is respectively connected with the power supply regulating unit and the control module and is used for stabilizing the regulated voltage.

9. The circuit of claim 2, wherein each of the control modules comprises:

the second digital-to-analog conversion unit is connected with the register unit and used for receiving the data signal and performing digital-to-analog conversion on the data signal to output a second analog signal;

and the power amplifier unit is respectively connected with the power management module, the second digital-to-analog conversion unit and the variable capacitor and is used for taking the regulated voltage as a power supply voltage, and amplifying and filtering the second analog signal under the control of the regulated voltage to obtain the control voltage.

10. The circuit of claim 9, wherein each of the control modules further comprises:

and the overvoltage protection unit is connected with each power amplification unit and the variable capacitor corresponding to the power amplification unit in common and is used for performing overvoltage protection on the variable capacitor.

11. The circuit of any one of claims 1-10, further comprising:

the voltage acquisition module is connected with the signal transmission module and is used for acquiring the working voltage of the signal transmission module;

and the reset module is connected with the voltage acquisition module and is used for resetting the circuit when the working voltage is greater than the voltage threshold.

12. An antenna module, comprising:

a plurality of variable capacitances;

the circuit of any one of claims 1-11, connected to a plurality of said variable capacitors, for outputting a corresponding said control voltage to said variable capacitors to adjust a capacitance value of said variable capacitors;

13. An electronic device, comprising:

a housing; and

the antenna module of claim 12, wherein the antenna module is housed within the housing.