CN116527463A - Common mode interference signal suppression device and method - Google Patents
Common mode interference signal suppression device and method Download PDFInfo
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- CN116527463A CN116527463A CN202310754768.7A CN202310754768A CN116527463A CN 116527463 A CN116527463 A CN 116527463A CN 202310754768 A CN202310754768 A CN 202310754768A CN 116527463 A CN116527463 A CN 116527463A
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- 230000001629 suppression Effects 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000001514 detection method Methods 0.000 claims abstract description 43
- 238000001914 filtration Methods 0.000 claims abstract description 13
- 238000010586 diagram Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03178—Arrangements involving sequence estimation techniques
- H04L25/03248—Arrangements for operating in conjunction with other apparatus
- H04L25/0328—Arrangements for operating in conjunction with other apparatus with interference cancellation circuitry
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03178—Arrangements involving sequence estimation techniques
- H04L25/03248—Arrangements for operating in conjunction with other apparatus
- H04L25/03254—Operation with other circuitry for removing intersymbol interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/08—Modifications for reducing interference; Modifications for reducing effects due to line faults ; Receiver end arrangements for detecting or overcoming line faults
- H04L25/085—Arrangements for reducing interference in line transmission systems, e.g. by differential transmission
-
- 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 application relates to the technical field of electronic information, in particular to a common mode interference signal suppression device and method. The device comprises a first detection unit, a second detection unit and a subtraction processing unit connected with the output of the first detection unit and the output of the second detection unit; the first detection unit and the second detection unit respectively detect a positive half-cycle signal and a negative half-cycle signal of the common mode signal, and the subtraction processing unit subtracts the same characteristic signals at the same time point in the positive half-cycle signal and the negative half-cycle signal to obtain a target signal. The invention provides a common mode interference signal suppression device and a common mode interference signal suppression method, which utilize the characteristic that voltage difference values of upper and lower envelopes of a common mode signal are equal in all positions in a time point direction, respectively detect two envelope signals, filter fundamental wave signals, then perform subtraction, and subtract out common mode noise. The processing of the common mode signal occurs after filtering the fundamental wave signal, so that the bandwidth requirement of an operational amplifier for processing the signal is reduced.
Description
Technical Field
The application relates to the technical field of electronic information, in particular to a common mode interference signal suppression device and method.
Background
During signal transmission and processing, common mode interference signals are inevitably mixed. In practical applications, the mode of generating the common mode interference is a thousand, and the mode of suppressing the common mode interference in the prior art is mainly performed by adopting an amplifier for an instrument. The method of suppressing the common mode signal by using the amplifier for the instrument can obtain good effects for most application occasions, but for the occasion when the useful signal amplitude is very low, the suppression effect is affected by the limitation of the device capability, and the suppression effect on the common mode signal is poor mainly because the common mode suppression ratio of the amplifier for the instrument is limited and is affected by the signal bandwidth, generally, the higher the frequency is, the lower the common mode suppression ratio is.
Disclosure of Invention
The application aims to provide a common mode interference signal suppression device and a common mode interference signal suppression method, so as to solve the problem of poor common mode signal suppression effect in the prior art.
In order to achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:
in a first aspect, an embodiment of the present application provides a common-mode interference signal suppression device, including a first detection unit and a second detection unit connected to an output signal, and a subtraction processing unit connected to outputs of the first detection unit and the second detection unit; the first detection unit and the second detection unit respectively detect a positive half-cycle signal and a negative half-cycle signal of the common mode signal, and the subtraction processing unit subtracts the same characteristic signals at the same time point in the positive half-cycle signal and the negative half-cycle signal to obtain a target signal.
Further, the output signals are input to the first detection unit and the second detection unit from the AA and GND terminals.
Further, the first detection unit and the second detection unit are respectively composed of a charge-discharge filter circuit and a rectifying circuit.
Further, the subtraction processing unit comprises a subtracter, and a positive input end and a negative input end of the subtracter are respectively connected with the first detection unit and the second detection unit.
Further, the output of the subtractor is connected to FF.
In a second aspect, a method for suppressing a common mode interference signal is provided, which is performed based on the common mode interference signal suppression device, and includes: acquiring a positive half-cycle signal and a negative half-cycle signal in a demodulation modulation signal; filtering fundamental wave signals in the positive half-cycle signals and the negative half-cycle signals to obtain positive half-cycle signals to be processed and negative half-cycle signals to be processed; subtracting the positive half-cycle signal to be processed and the negative half-cycle signal to be processed, and eliminating common mode noise to obtain a target positive half-cycle signal and a target negative half-cycle signal; and combining the target positive half-cycle signal and the negative half-cycle signal to obtain the target in-demodulation modulation signal.
Further, acquiring the positive half cycle signal includes: and acquiring a plurality of voltages of a positive half cycle signal of the common mode signal at a plurality of time points, and determining based on the pressure difference between the voltages.
Further, acquiring the negative half-cycle signal includes: and acquiring a plurality of voltages of a plurality of time points of the negative half cycle signal of the common mode signal, and determining based on the pressure difference among the plurality of voltages.
Further, filtering fundamental wave signals in the positive half cycle signal and the negative half cycle signal includes: and rectifying the positive half-cycle signal and the negative half-cycle signal based on a half-wave rectifying circuit, and filtering the positive half-cycle signal and the negative half-cycle signal based on an RC filter circuit.
Further, combining the target positive half-cycle signal and the negative half-cycle signal to obtain a target in-demodulation modulation signal includes: the target positive half-cycle signal and the negative half-cycle signal are combined based on the same time.
Compared with the prior art, the application has the following beneficial effects:
the invention provides a common mode interference signal suppression device and a common mode interference signal suppression method, which utilize the characteristic that voltage difference values of upper and lower envelopes of a common mode signal are equal in all positions in a time point direction, respectively detect two envelope signals, filter fundamental wave signals, then perform subtraction, and subtract out common mode noise. The processing of the common mode signal occurs after filtering the fundamental wave signal, so that the bandwidth requirement of an operational amplifier for processing the signal is reduced.
In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting in scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a waveform change chart of a modulation process of a modulated wave signal according to an embodiment of the present application.
Fig. 2 is a waveform diagram of a target signal according to an embodiment of the present application.
Fig. 3 is a schematic diagram of a detection circuit according to an embodiment of the present application.
Fig. 4 is a waveform diagram of a rectifying and filtering process according to an embodiment of the present application.
Fig. 5 is a waveform diagram of an unprocessed signal according to an embodiment of the present application.
Fig. 6 is a waveform diagram after processing according to an embodiment of the present application.
Fig. 7 is a signal characteristic diagram provided in an embodiment of the present application.
Fig. 8 is a waveform diagram of a signal after being processed by a circuit according to an embodiment of the present application.
Fig. 9 is a schematic flow chart of a common mode interference signal suppression method according to an embodiment of the present application.
Fig. 10 is a schematic circuit diagram of a common mode interference signal suppression device according to an embodiment of the present application.
Fig. 11 is a waveform diagram of a processed signal according to an embodiment of the present application.
Fig. 12 is a representation of raw signal characteristics provided in an embodiment of the present application.
Fig. 13 is a representation of signal characteristics after processing by the common mode interference signal suppression method according to the embodiment of the present application.
Description of the embodiments
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.
Common mode signals are the same signals applied to the two inputs of a differential amplifier or instrumentation amplifier, typically due to line conduction and spatial magnetic field interference, and are unwanted signals, differential mode signals being 180 degrees out of phase with the two input signals. If the common mode signal is amplified much, it affects the differential mode signal that really needs to be amplified.
The application scene of the common mode interference signal suppression device and the common mode interference signal suppression method provided by the embodiment of the application is a modulation signal in demodulation.
Referring to fig. 1, a method for modulating a modulated wave signal is shown, in which a modulated wave signal is modulated and then transmitted, and then the signal transmission process of the modulated signal is demodulated. The method has the advantages of strong interference resistance, convenient transmission and the like and is widely applied. The participation fig. 2 shows a modulated waveform received by a modulated wave signal receiving end, wherein an upper envelope line formed by connecting positive peak points as a maximum value of the signal waveform and a lower envelope line formed by connecting negative peak points as a minimum value of the signal waveform can represent the characteristics of a target transmission signal.
In order to extract the target signal from the signal shown in fig. 2, a detection circuit shown in fig. 3 is generally used, wherein the detection circuit is used for detecting the positive half cycle of the signal, the signal is input from the AA and GND terminals, rectified by the diode D1, and filtered by the charge-discharge filter circuit formed by R1, R2 and C1, so as to obtain the RC-filtered signal shown in fig. 4. In the embodiment of the application, the signal is a wave-like fold line with the same trend as the peak envelope, and the trend characteristic is the signal characteristic. The ratio of the fundamental wave frequency to the signal frequency in fig. 4 is approximately 10 times, the fundamental wave frequency in practical engineering is far higher than the signal frequency, and the high-frequency wave-like folding line signal with the fundamental wave frequency characteristic can be conveniently filtered out, so that a very smooth characteristic curve can be obtained.
As shown in fig. 5, in the actual processing, the signal to be transmitted is set to a signal with zero voltage, and the modulated wave signal receiving end receives an unprocessed signal of the signal. The signal processed by the circuit of fig. 3 is shown in fig. 6. If the transmitted zero voltage signal is subjected to a common mode interference signal, the signal characteristics shown in fig. 7 are obtained. This signal is processed by the circuit shown in fig. 3 and is shown in fig. 8. It is apparent that the RC filtered waveform is similar to the characteristics of fig. 4, and when the frequencies are similar, the back-end signal analysis system will take the interference signal as a useful signal to make an erroneous determination.
For the modulated signal subjected to common mode interference shown in fig. 4, there are many methods for suppressing the common mode interference, and two differential inputs of the amplifier for the instrument are used.
The method of suppressing the common mode signal by the amplifier for an instrument and the like can obtain good effects for most application occasions, but for the occasion when the useful signal amplitude is low, the suppression effect is affected by the limitation of the device capability, and is mainly represented by that the common mode suppression ratio of the amplifier for an instrument is limited, and is also affected by the signal bandwidth, generally, the higher the frequency is, the lower the common mode suppression ratio is, and the suppression effect on the common mode signal is poor.
According to the common-mode interference signal suppression method, through the characteristic that voltage difference values of upper and lower envelopes of a common-mode signal at all positions of a time point are equal, two envelope signals are detected respectively, fundamental wave signals are filtered, subtraction is carried out, and common-mode noise is reduced. Since processing the common mode signal occurs after filtering out the fundamental signal, the bandwidth requirements on the operational amplifier processing the signal are reduced.
Referring to fig. 9, the specific process for the inhibition method is:
step S110, obtaining an upper envelope curve and a lower envelope curve signal in the demodulation modulation signal.
And S120, filtering fundamental wave signals in the upper envelope line and the lower envelope line signals.
S130, subtracting the upper envelope line and the lower envelope line after fundamental wave filtering, and eliminating common mode noise in the upper envelope line and the lower envelope line to obtain an upper target envelope line and a lower target envelope line.
And S140, combining the target upper envelope curve and the target lower envelope curve to obtain a target modulation signal.
Wherein the obtaining of the upper envelope curve and the lower envelope curve in the step S110 includes: and acquiring a plurality of voltages of a positive half cycle signal of the common mode signal at a plurality of time points, and determining based on the pressure difference between the voltages. And acquiring a plurality of voltages of a plurality of time points of the negative half cycle signal of the common mode signal, and determining based on the pressure difference among the plurality of voltages.
Wherein the filtering of the fundamental wave signal in step S120 rectifies the upper envelope and the lower envelope based on a half-wave rectification circuit, and filters the upper envelope and the lower envelope based on an RC filter circuit.
Whereas the acquisition of the demodulation modulated signal for the target in step S140 is obtained by combining the target upper envelope and the target lower envelope.
The processing in steps S110 to S140 is implemented based on the common mode interference signal suppression device, and referring to fig. 10, the processing device mainly includes the circuit shown in fig. 10. Wherein the device comprises a first detection unit and a second detection unit which are connected with a demodulation modulation signal, and a subtraction processing unit which is connected with the output of the first detection unit and the output of the second detection unit; the first detection unit and the second detection unit respectively detect a positive half-cycle signal and a negative half-cycle signal of the common mode signal, and the subtraction processing unit subtracts the same characteristic signals at the same time point in the positive half-cycle signal and the negative half-cycle signal to obtain a target signal.
Wherein the GND terminal is input to the first detection unit and the second detection unit with respect to the modulated signal by AA. The first detection unit and the second detection unit in the embodiment of the application are respectively composed of a charge-discharge filter circuit and a rectifying circuit. The subtraction processing unit comprises a subtracter, and a positive input end and a negative input end of the subtracter are respectively connected with the first detection unit and the second detection unit.
The whole processing process for the device is as follows: signals are input from the AA and GND ends, rectified by the diode D2, and filtered by the charge-discharge filter circuit formed by the R3, the R4 and the C2, so that the signals shown in FIG. 11 are obtained. The positive half cycle and the negative half cycle of the alternating current signal are taken respectively, and the same interference signal characteristic can be taken out. Subtracting the two signals can exactly subtract the interference signal characteristics to form a flat signal line which accords with the output characteristics of the source. After the lower envelope of the useful signal mirrors the time axis, the useful signal just coincides with the upper envelope, and after the two coincident lines are overlapped, the signal is doubled, thereby realizing the effect of extracting the useful signal and eliminating the interference signal. It should be noted that, in the embodiments of the present application, the wave-like folding line is mainly used to characterize a specific waveform, and is used to explain the processing principle thereof.
Referring to fig. 12 and 13, fig. 12 and 13 show signal characteristics of the common mode interference signal suppression method according to the embodiments of the present application. As can be seen from the comparison, by applying the common mode interference signal suppression method in the embodiment of the application, the useful signal is clearer and more recognized.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. A common mode interference signal suppressing apparatus comprising a first detection unit and a second detection unit connected to a demodulation modulation signal, and a subtraction processing unit connected to outputs of the first detection unit and the second detection unit; the first detection unit and the second detection unit respectively detect a positive half-cycle signal and a negative half-cycle signal of the common mode signal, and the subtraction processing unit subtracts the same characteristic signals at the same time point in the positive half-cycle signal and the negative half-cycle signal to obtain a target signal.
2. The apparatus according to claim 1, wherein the modulated signal is input from AA, GND terminal to the first detection unit and the second detection unit.
3. The common-mode interference signal suppressing apparatus according to claim 1 or 2, wherein the first detection unit and the second detection unit are respectively composed of a charge-discharge filter circuit and a rectifier circuit.
4. A common-mode interference signal suppressing apparatus according to claim 3, wherein said subtracting processing unit comprises a subtractor, and a positive input terminal and a negative input terminal of said subtractor are connected to said first detecting unit and said second detecting unit, respectively.
5. The apparatus of claim 4 wherein the output of the subtractor is connected to FF.
6. A method for suppressing a common mode interference signal, which is based on the common mode interference signal suppressing apparatus according to any one of claims 1 to 5, the method comprising:
acquiring a positive half-cycle signal and a negative half-cycle signal in a demodulation modulation signal;
filtering fundamental wave signals in the positive half-cycle signals and the negative half-cycle signals to obtain positive half-cycle signals to be processed and negative half-cycle signals to be processed;
subtracting the positive half-cycle signal to be processed and the negative half-cycle signal to be processed, and eliminating common mode noise to obtain a target positive half-cycle signal and a target negative half-cycle signal;
and combining the target positive half-cycle signal and the negative half-cycle signal to obtain the target in-demodulation modulation signal.
7. The method of common mode interference signal suppression according to claim 6, wherein acquiring the positive half-cycle signal comprises: and acquiring a plurality of voltages of a positive half cycle signal of the common mode signal at a plurality of time points, and determining based on the pressure difference between the voltages.
8. The method of common mode interference signal suppression according to claim 6, wherein acquiring the negative half-cycle signal comprises: and acquiring a plurality of voltages of a plurality of time points of the negative half cycle signal of the common mode signal, and determining based on the pressure difference among the plurality of voltages.
9. The method of common mode interference signal rejection according to claim 6, wherein filtering fundamental wave signals in the positive half cycle signal and the negative half cycle signal comprises: and rectifying the positive half-cycle signal and the negative half-cycle signal based on a half-wave rectifying circuit, and filtering the positive half-cycle signal and the negative half-cycle signal based on an RC filter circuit.
10. The method of suppressing a common-mode interference signal according to claim 6, wherein combining the target positive half-cycle signal and the negative half-cycle signal to obtain the target on-demodulation modulation signal comprises: the target positive half-cycle signal and the negative half-cycle signal are combined based on the same time.
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| CN202310754768.7A CN116527463A (en) | 2023-06-26 | 2023-06-26 | Common mode interference signal suppression device and method |
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| CN202310754768.7A CN116527463A (en) | 2023-06-26 | 2023-06-26 | Common mode interference signal suppression device and method |
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