CN109547138B - Amplitude control circuit and multichannel amplitude control matrix - Google Patents
Amplitude control circuit and multichannel amplitude control matrix Download PDFInfo
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- CN109547138B CN109547138B CN201710867833.1A CN201710867833A CN109547138B CN 109547138 B CN109547138 B CN 109547138B CN 201710867833 A CN201710867833 A CN 201710867833A CN 109547138 B CN109547138 B CN 109547138B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/391—Modelling the propagation channel
- H04B17/3912—Simulation models, e.g. distribution of spectral power density or received signal strength indicator [RSSI] for a given geographic region
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/391—Modelling the propagation channel
- H04B17/3911—Fading models or fading generators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses an amplitude control circuit and a multi-channel amplitude control matrix, wherein the amplitude control circuit comprises: the device comprises a calibration control module and an amplitude control module; the amplitude control module is used for receiving an input signal; the calibration control module is used for setting a target amplitude of the input signal, generating a control signal and sending the control signal to the amplitude control module; and the amplitude control module is also used for adjusting the amplitude of the input signal to a target amplitude according to the control signal and outputting the target amplitude. The invention can make up the defect of low amplitude control precision in the prior art, and obtains high amplitude control precision and higher amplitude control dynamic range in a wide frequency range.
Description
Technical Field
The invention belongs to the field of radio electronic information, and particularly relates to an amplitude control circuit and a multichannel amplitude control matrix.
Background
The Massive MIMO (multiple input multiple output) simulation technology is one of the key technologies of the 5G network and the communication technology, and can help to realize the simulation of the 5G electromagnetic signal application environment, the research of OTA beam forming algorithm and the development, evaluation and test of the 5G array antenna. The multi-channel high-precision amplitude control matrix is widely applied in the radio field, such as traditional radio receiver sensitivity test, sensitivity test of various radio terminals and products such as mobile phones and Ipad, various tests and system application needing to control the strength of radio signals, a series of new applications such as a 5G MIMO test system, a 5G OTA test system, a 5G, LTE and fading simulation of various signals, and the like. Particularly, the requirement of a 5G MIMO test system on a multi-channel high-precision amplitude control system is particularly urgent, and it can be said that the requirement is one of key technologies of a 5G test. The amplitude control precision of products (such as Keysight, aeroflex products of international famous companies and leaders in the field) on the market at present can only reach 0.5dB at a low frequency band, and the precision is lower when a high frequency such as a millimeter wave frequency band generally exceeds 1dB to several dB.
Disclosure of Invention
The invention provides an amplitude control circuit and a multi-channel amplitude control matrix, aiming at solving the technical problem of low amplitude control precision in the prior art.
The invention solves the technical problems through the following technical scheme:
an amplitude control circuit comprising: the device comprises a calibration control module and an amplitude control module;
the amplitude control module is used for receiving an input signal;
the calibration control module is used for setting a target amplitude of the input signal, generating a control signal and sending the control signal to the amplitude control module;
the amplitude control module is also used for adjusting the amplitude of the input signal to a target amplitude according to the control signal and then outputting the target amplitude.
Preferably, the control signal is a digital signal, the amplitude control module includes a numerical control attenuator, and the control signal is used to adjust an attenuation value of the numerical control attenuator.
Preferably, the calibration control module includes: a calibration sub-module and a control sub-module;
the calibration submodule is used for storing a calibration table, and the calibration table records corresponding amplitudes of the amplitude control module under different control instructions;
the control submodule is used for acquiring the target amplitude of the input signal, reading the calibration table, inquiring the amplitude closest to the target amplitude in the calibration table, acquiring the control instruction corresponding to the closest amplitude, converting the acquired control instruction into a control signal and sending the control signal to the amplitude control module.
Preferably, the calibration sub-module is further configured to invoke the control sub-module to send different control instructions to the amplitude control module, test the amplitude of the amplitude control module under different control signals through a network analyzer, and record the amplitude in the calibration table.
Preferably, the amplitude control circuit further includes: an input module;
the input module is used for inputting the amplitude requirement value of the input signal and sending the amplitude requirement value to the calibration control module;
the calibration control module is further configured to set the amplitude demand value to the target amplitude.
Preferably, the input module comprises a human-computer interaction interface.
A multi-channel amplitude control matrix comprising: a calibration control unit and an amplitude control unit;
the amplitude control unit is used for receiving M paths of input signals, M is a positive integer and is more than or equal to 2; the calibration control unit is used for setting a target amplitude of each path of input signal, generating a control signal and sending the control signal to the amplitude control unit;
and the amplitude control unit is used for adjusting the amplitude of each path of input signal to a target amplitude according to the control signal and then outputting the target amplitude.
Preferably, the multichannel amplitude control matrix further comprises: a power division module;
the power dividing module is used for inputting N paths of signals to be processed, dividing the N paths of signals to be processed into M paths of output signals, and outputting the M paths of output signals serving as input signals to the amplitude control unit, wherein N is a positive integer and is less than M.
Preferably, the amplitude control unit includes M amplitude control branches, and each amplitude control branch is used for adjusting the amplitude of the 1-channel input signal to a target amplitude and outputting the target amplitude.
Preferably, the control signal is a digital signal, the amplitude control branch includes a numerical control attenuator, and the control signal is used to adjust an attenuation value of the numerical control attenuator.
Preferably, the calibration control unit includes: a calibration subunit and a control subunit;
the calibration subunit is configured to store a calibration table, where the calibration table records amplitudes corresponding to the amplitude control branches under different control instructions;
the control subunit is configured to obtain a target amplitude of each input signal, read the calibration table, query an amplitude in the calibration table that is closest to the target amplitude, obtain a control instruction corresponding to the closest amplitude, convert the obtained control instruction into a control signal, and send the control signal to the amplitude control unit.
Preferably, the calibration subunit is further configured to invoke the control subunit to send different control instructions to the amplitude control branch, test the amplitude of the amplitude control branch under different control signals through a network analyzer, and record the amplitude in the calibration table.
Preferably, the multichannel amplitude control matrix further comprises: an input unit;
the input unit is used for inputting the amplitude requirement value of each path of input signal and sending the amplitude requirement value to the calibration control unit;
the calibration control unit is further configured to set the amplitude demand value to the target amplitude.
Preferably, the input unit includes a human-computer interaction interface.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The positive progress effects of the invention are as follows: the invention adopts the high-precision numerical control attenuator, and generates a precise control signal through test and calibration, so that a high-precision amplitude control target is realized. The frequency of series products designed by the invention can cover 0.5-40GHz, the amplitude control precision can reach 0.2dB in all frequency bands, the amplitude regulation dynamic range can reach 120dB, and the amplitude control precision is greatly improved compared with the products in the current market.
Drawings
Fig. 1 is a schematic block diagram of an amplitude control circuit of embodiment 1 of the present invention.
Fig. 2 is a schematic block diagram of a multichannel amplitude control matrix according to embodiment 2 of the present invention.
Fig. 3 is a schematic diagram of amplitude control of the amplitude control unit of the multi-channel amplitude control matrix according to embodiment 2 of the present invention for M input signals.
Fig. 4 is a schematic block diagram of another implementation of the multi-channel amplitude control matrix of embodiment 2 of the present invention.
Fig. 5 is a schematic diagram of amplitude control of the multichannel amplitude control matrix in fig. 4 for 1 channel of signals to be processed.
Fig. 6 is a schematic diagram of a 2 x 32 multichannel amplitude control matrix.
Fig. 7 is a schematic diagram of another 2 x 32 multichannel amplitude control matrix.
Fig. 8 is a schematic diagram of a 4 x 16 multi-channel amplitude control matrix.
Fig. 9 is a schematic diagram of another 4 x 16 multi-channel amplitude control matrix.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1
Fig. 1 shows an amplitude control circuit of the present embodiment, which is used to adjust the amplitude of an input signal. The amplitude control circuit includes: a calibration control module 101 and an amplitude control module 102.
The amplitude control module 102 is configured to receive an input signal.
The calibration control module 101 is configured to set a target amplitude of the input signal, generate a control signal, and send the control signal to the amplitude control module 102.
The amplitude control module 102 is further configured to adjust the amplitude of the input signal to a target amplitude according to the control signal and then output the adjusted amplitude.
Wherein, the target amplitude can be set by the user according to the actual requirement, and in order to facilitate the setting of the user, the amplitude control circuit of the embodiment further includes: an input module 103. The input module 103 is configured to input an amplitude requirement value of the input signal, and send the amplitude requirement value to the calibration control module 101; the calibration control module 101 sets the amplitude demand value to the target amplitude. In particular, the input module 103 may comprise a human-machine interface enabling a GUI (graphical user interface) allowing a user to input an amplitude requirement value of an input signal.
In this embodiment, after the input signal is input to the amplitude control module 102, the amplitude is adjusted and then output. The control signal may be a digital signal, the amplitude control module includes a numerical control attenuator, and the control signal is used to adjust an attenuation value of the numerical control attenuator. Under the control of the control signal, the amplitude of the signal output by the amplitude control module 102 is equal to the target amplitude. The amplitude control module 102 of this embodiment may implement digital control of the amplitude, the number of bits to be controlled may be selected according to the required control precision of the amplitude control circuit, and specifically, the formula for determining the number of bits to be controlled is as follows:
60dB/2 n amplitude precision with x 3 being less than or equal to requirement
Wherein n is the number of bits controlled.
If 0.5dB accuracy is to be achieved, 9bit amplitude control can be selected, etc.
In this embodiment, the calibration control module 101 includes: a calibration sub-module and a control sub-module.
The calibration submodule is used for storing a calibration table, and the calibration table records corresponding amplitudes of the amplitude control module under different control instructions.
The calibration sub-module may specifically establish the calibration table in the following manner:
and calling the control submodule to send different control instructions to the amplitude control module 102, testing the amplitude of the amplitude control module 102 under different control signals through a network analyzer, and recording the amplitude in the calibration table. The network analyzer is a comprehensive microwave measuring instrument which can scan and measure in a wide frequency band to determine network parameters, can directly measure complex scattering parameters of active or passive, reversible or irreversible double-port and single-port networks, and gives the amplitude and phase frequency characteristics of each scattering parameter in a frequency scanning mode.
The control submodule is used for acquiring the target amplitude of the input signal, reading the calibration table, inquiring the amplitude closest to the target amplitude in the calibration table, acquiring the control instruction corresponding to the closest amplitude, converting the acquired control instruction into a control signal and sending the control signal to the amplitude control module.
The amplitude control circuit of this embodiment may adjust the amplitude of the 1 channel input signal, wherein the calibration control module 101 may accurately obtain the control signal required to reach the target amplitude by testing and calibrating the amplitude of the amplitude control module 102, so as to realize accurate control of the amplitude control module 102. The calibration control module 101 may be implemented using software programming that stores a computer program that enables the calibration sub-module and the control sub-module. The frequency of series products manufactured by the amplitude control circuit can cover the range of 0.5-40GHz, the amplitude control precision of 0.2dB can be obtained at any frequency and amplitude value, and the amplitude adjustment dynamic range from 50dB to more than 120dB can be realized according to the design requirement. In a dynamic range, any amplitude value can be input on a human-computer interaction interface by minimum 0.1dB, and then a setting key is clicked, so that the network analyzer can measure the actual amplitude, and the deviation is within 0.2 dB.
Example 2
FIG. 2 shows a multichannel amplitude control matrix of the present embodiment, which is used to adjust the amplitude of M input signals, where M is a positive integer and M ≧ 2. The multichannel amplitude control matrix comprises: a calibration control unit 201 and an amplitude control unit 202.
The amplitude control unit 202 is configured to receive M input signals.
The calibration control unit 201 is configured to set a target amplitude of each input signal, generate a control signal, and send the control signal to the amplitude control unit 202.
The amplitude control unit 202 is further configured to adjust the phase of each input signal to a target phase and adjust the amplitude to a target amplitude according to the control signal, and then output the adjusted phase and amplitude.
Wherein, the target amplitude can be set by the user according to the actual requirement, and in order to facilitate the setting of the user, the multi-channel amplitude control matrix of the embodiment further includes: an input unit 203. The input unit 203 is configured to input an amplitude requirement value of each input signal, and send the amplitude requirement value to the calibration control unit 201; the calibration control unit 201 sets the amplitude demand value to the target amplitude. Specifically, the input unit 203 may include a human-machine interface (hmi) capable of implementing a GUI (graphical user interface) allowing a user to input an amplitude requirement value of each input signal.
Fig. 3 shows a schematic diagram of amplitude control of the M input signals by the amplitude control unit 202 of the present embodiment. After the M input signals are input to the amplitude control unit 202, amplitude adjustment is performed on each input signal. Specifically, the amplitude control unit 202 includes M amplitude control branches 2021, and each amplitude control branch 2021 is respectively configured to adjust the amplitude of the 1 input signal to a target amplitude and then output the target amplitude.
In this embodiment, the control signal is a digital signal, and the amplitude control branch includes; and the control signal is used for adjusting the attenuation value of the numerical control attenuator. And under the control of the control signal, the amplitude of the signal output by the amplitude control branch circuit is equal to the target amplitude. The numerical control attenuator can adopt a 10-bit high-precision numerical control attenuator to obtain fine attenuation control stepping, and can realize the amplitude adjustment dynamic range from 50dB to more than 120dB at the lowest level according to design requirements. Specifically, the number of bits to be controlled may be selected according to the required control accuracy of the amplitude control matrix, and specifically, the formula for determining the number of bits to be controlled is as follows:
60dB/2 n amplitude accuracy required to be less than or equal to X3
Wherein n is the number of bits controlled.
If 0.5dB accuracy is achieved, 9bit amplitude control can be selected.
In this embodiment, the calibration control unit 201 includes: a calibration subunit and a control subunit.
The calibration subunit is configured to store a calibration table, where the calibration table records amplitudes corresponding to the amplitude control branches under different control instructions.
The calibration subunit may specifically establish the calibration table in the following manner:
and calling the control subunit to send different control instructions to the amplitude control branch, testing the amplitude of the amplitude control branch under different control signals through a network analyzer, and recording the amplitude in the calibration table. The network analyzer is a comprehensive microwave measuring instrument capable of scanning and measuring in a wide frequency band to determine network parameters, and can directly measure complex scattering parameters of an active or passive, reversible or irreversible double-port and single-port network and give amplitude and phase frequency characteristics of the scattering parameters in a frequency scanning mode.
The control subunit is configured to obtain a target amplitude of each input signal, read the calibration table, query an amplitude in the calibration table that is closest to the target amplitude, obtain a control instruction corresponding to the closest amplitude, convert the obtained control instruction into a control signal, and send the control signal to the numerical control attenuator, where the numerical control attenuator adjusts an attenuation value according to the control signal.
In this embodiment, the calibration control unit 201 can accurately obtain the control signal required to reach the target amplitude by testing and calibrating the amplitude of the amplitude control branch, so as to implement accurate control of the amplitude control branch. The calibration control unit 201 may be implemented in software programming, which stores computer programs enabling the calibration unit and the control unit.
The frequency coverage of series products manufactured by the multichannel amplitude control matrix can reach 0.5-40GHz, the amplitude control precision of 0.2dB can be obtained at any frequency and amplitude value, and the amplitude adjustment dynamic range of 50dB to more than 120dB can be realized at the lowest according to the design requirement. In a dynamic range, any amplitude can be input on a human-computer interaction interface in a minimum step of 0.1dB, and then a setting key is clicked, so that the actual amplitude can be measured by a network analyzer, and the deviation is within 0.2 dB.
In this embodiment, the M input signals may be M signals output by an upper device and directly input to the amplitude control unit 202, and M is set according to actual requirements.
In this embodiment, the M input signals may also be M signals obtained by dividing, by a power dividing module, the output signal of the upper device, as shown in fig. 4, an output end of the power dividing module 204 is connected to an input end of the amplitude control unit 202, and is configured to input N signals to be processed, divide the N signals to be processed into M output signals, and output the M output signals to the amplitude control unit 202 as input signals, where N is a positive integer and N is less than M. The power dividing module 204 may specifically be implemented by using power dividers, the number of the power dividers may be determined according to the number of signals to be processed, if N paths of signals to be processed exist, the power dividing module sets N power dividers, each power divider corresponds to one path of signal to be processed, as shown in fig. 5, 1 path of signal to be processed is input to the power divider 2041 and then divided into multiple output signals, each output signal is input to 1 amplitude control branch 2021 as an input signal, each amplitude control branch 2021 performs amplitude adjustment on the input signal, and finally outputs an adjusted signal. The values of M and N may be selected autonomously according to actual requirements, for example, as shown in fig. 6-7, two N =2 power dividers are used for the power division module, and a 2 × 32 multichannel amplitude control matrix formed by M =64 is used, or as shown in fig. 8-9, two N =4 power dividers are used for the power division module, and a 4 × 16 multichannel amplitude control matrix formed by M =64 is used for the power division module, or a multichannel amplitude control matrix of other combinations is used.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (7)
1. An amplitude control circuit, comprising: the device comprises a calibration control module and an amplitude control module;
the amplitude control module is used for receiving an input signal;
the calibration control module is used for setting a target amplitude of the input signal, generating a control signal and sending the control signal to the amplitude control module;
the amplitude control module is also used for adjusting the amplitude of the input signal to a target amplitude according to the control signal and then outputting the target amplitude;
the control signal is a digital signal, the amplitude control module comprises a numerical control attenuator, and the control signal is used for adjusting an attenuation value of the numerical control attenuator, wherein the digit n of the control signal is determined according to the following formula:
60dB/2 n x 3 is less than or equal to the required amplitude precision;
the amplitude control circuit further includes: an input module;
the input module is used for inputting an amplitude demand value of the input signal and sending the amplitude demand value to the calibration control module;
the calibration control module is further configured to set the amplitude demand value to the target amplitude;
the calibration control module includes: a calibration sub-module and a control sub-module;
the calibration submodule is used for storing a calibration table, and the calibration table records corresponding amplitudes of the amplitude control module under different control instructions;
the control submodule is used for acquiring the target amplitude of the input signal, reading the calibration table, inquiring the amplitude closest to the target amplitude in the calibration table, acquiring the control instruction corresponding to the closest amplitude, converting the acquired control instruction into a control signal and sending the control signal to the amplitude control module.
2. The amplitude control circuit of claim 1, wherein the calibration sub-module is further configured to invoke the control sub-module to send different control commands to the amplitude control module, test the amplitude of the amplitude control module under different control signals through a network analyzer, and record the amplitude in the calibration table.
3. The amplitude control circuit of claim 1, wherein the input module comprises a human-machine interface.
4. A multi-channel amplitude control matrix, comprising: a calibration control unit and an amplitude control unit;
the amplitude control unit is used for receiving M paths of input signals, M is a positive integer and is more than or equal to 2; the calibration control unit is used for setting a target amplitude of each path of input signal, generating a control signal and sending the control signal to the amplitude control unit;
the amplitude control unit is used for adjusting the amplitude of each path of input signal to a target amplitude according to the control signal and then outputting the target amplitude;
the amplitude control unit comprises M amplitude control branches, and each amplitude control branch is used for adjusting the amplitude of the 1-path input signal to a target amplitude and outputting the target amplitude;
the control signal is a digital signal, the amplitude control branch comprises a numerical control attenuator, the control signal is used for adjusting an attenuation value of the numerical control attenuator, and the number n of bits of the control signal is determined according to the following formula:
60dB/2 n x 3 is less than or equal to the required amplitude precision;
the multi-channel amplitude control matrix further comprises: an input unit;
the input unit is used for inputting the amplitude requirement value of each path of input signal and sending the amplitude requirement value to the calibration control unit;
the calibration control unit is further configured to set the amplitude demand value to the target amplitude;
the calibration control unit includes: a calibration subunit and a control subunit;
the calibration subunit is configured to store a calibration table, where the calibration table records amplitudes corresponding to the amplitude control branches under different control instructions;
the control subunit is configured to obtain a target amplitude of each input signal, read the calibration table, query an amplitude in the calibration table that is closest to the target amplitude, obtain a control instruction corresponding to the closest amplitude, convert the obtained control instruction into a control signal, and send the control signal to the amplitude control unit.
5. The multi-channel amplitude control matrix of claim 4, further comprising: a power division module;
the power dividing module is used for inputting N paths of signals to be processed, dividing the N paths of signals to be processed into M paths of output signals, and outputting the M paths of output signals serving as input signals to the amplitude control unit, wherein N is a positive integer and is less than M.
6. The multi-channel amplitude control matrix of claim 4, wherein the calibration subunit is further configured to invoke the control subunit to send different control commands to the amplitude control branch, and test the amplitude of the amplitude control branch under different control signals through a network analyzer, and record the test result in the calibration table.
7. The multi-channel amplitude control matrix of claim 4, wherein the input unit comprises a human-machine interface.
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