Electromagnetic radiation detection circuit for differential signal line

Abstract

The utility model discloses an electromagnetic radiation detection circuit for differential signal lines, which comprises a simulation load, the simulation load is electrically connected with a signal input end, and a signal line P and a signal line N are respectively and electrically connected with a filter circuit for filtering signals. The signal line P and the signal line N are further electrically connected with a detection circuit used for detecting electromagnetic radiation, the output end of the detection circuit is electrically connected with an amplifier used for amplifying electric signals, the output end of the amplifier is electrically connected with the input end of a scanner, and the output end of the scanner is electrically connected with the output end of a frequency spectrograph. The differential signal line of the analog load is connected to the filter circuit, noise and interference signals in the circuit can be filtered out, electromagnetic radiation of the differential signal line can be acquired through the detection circuit and the amplifier, and the acquired electric signal can be conveniently and accurately detected and processed by a scanner after being amplified. And the scanner is responsible for converting the detected electromagnetic radiation signal into an observable signal.

Description

Technical Field

[0001] The utility model relates to the technical field of differential signal line detection, in particular to an electromagnetic radiation detection circuit for differential signal lines. Background Art

[0002] The signal waveform transmitted in the differential signal line usually has the characteristic of rapid change, that is, the rising and falling edges of the signal are very steep. This rapidly changing signal waveform will cause high-frequency components to appear on the signal line, thereby generating electromagnetic radiation, and the signals transmitted by the two wires in the differential signal line have opposite polarities, so their currents will also have opposite directions. When the currents of the two wires are not completely balanced, that is, when there is a slight difference in their current magnitude or phase, it will cause an electromagnetic field to be generated around the signal line, thereby forming electromagnetic radiation.

[0003] After searching, in the prior art, the publication number is CN105652070B, which discloses a differential signal amplitude detection circuit, wherein the gates of the first and second NMOS tubes are connected to negative and positive inputs, the sources of the first and second NMOS tubes are connected, and grounded through the first constant current source; the gates of the third and fourth NMOS tubes are connected to positive and negative inputs, the sources of the third and fourth NMOS tubes are connected, and grounded through the second constant current source; the drains of the first and third NMOS tubes are connected, and connected to the power supply through the first resistor; the drains of the second and fourth NMOS tubes are connected as the first connection point, and connected to the power supply through the second resistor; the connection point of the third and fourth resistors is connected to the gates of the fifth and sixth NMOS tubes, the sources of the fifth and sixth NMOS tubes are connected, and grounded through the third constant current source, the drains of the fifth and sixth NMOS tubes are connected to the power supply through the fifth and sixth resistors, and the connection point of the sixth NMOS tube and the sixth resistor is the second connection point; the first and second connection points are connected to the two input terminals of the comparator, and output VOUT. The invention has a simple structure, low power consumption, can effectively detect millivolt-level differential small signals, and has a wide range of applications.

[0004] However, the device and the prior art still have the following defects:

[0005] Due to the existence of electromagnetic radiation in the existing differential signal lines, in order to comply with regulatory requirements, it is necessary to detect the electromagnetic radiation in the differential signal lines, especially for electronic equipment, communication equipment, radio equipment, etc. The equipment and systems are very sensitive to electromagnetic radiation and may be interfered by electromagnetic radiation, resulting in performance degradation or even failure. When the existing electromagnetic radiation detection circuit detects the differential signal lines, it is difficult to obtain the electromagnetic radiation signal due to noise and interference signals in the circuit. At the same time, there is also a situation where the electrical signal received by the scanner is weak and cannot be accurately obtained, detected and processed.

[0006] Therefore, it is necessary to provide an electromagnetic radiation detection circuit for differential signal lines to solve the above technical problems. Utility Model Content

[0007] The purpose of the utility model is to provide an electromagnetic radiation detection circuit for a differential signal line to solve the problem of electromagnetic radiation detection proposed in the above background technology.

[0008] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0009] An electromagnetic radiation detection circuit for a differential signal line includes an analog load, the analog load is electrically connected to a signal input end, the signal input end is used to receive a differential signal generated by a simulated working state of the analog load, the signal input end includes a signal line P and a signal line N, the signal line P and the signal line N are respectively electrically connected to a filter circuit for filtering the signal, the signal line P and the signal line N are also respectively electrically connected to a detection circuit for detecting electromagnetic radiation, the output end of the detection circuit is electrically connected to an amplifier for amplifying electrical signals, the output end of the amplifier is electrically connected to the input end of a scanner, and the output end of the scanner is electrically connected to the output end of a spectrometer.

[0010] Preferably, the filtering circuit includes a resistor R1, a resistor R2, a capacitor C1, a capacitor C2 and an inductor L1, an inductor L2, the capacitor C1, the resistor R1 and the inductor L1 are connected in series, the capacitor C2, the resistor R2 and the inductor L2 are connected in series, the terminal of the capacitor C1 after the series connection is connected to the signal line P, the terminal of the capacitor C2 after the series connection is connected to the signal line N, and the inductor L1 and the inductor L2 are grounded.

[0011] Preferably, the detection circuit includes inductor L3, inductor L4, inductor L5, inductor L6, resistor R3, resistor R4, capacitor C3, capacitor C4, capacitor C5 and capacitor C6, the inductor L3 is connected in series with the inductor L5, one end of the resistor R3 is connected between the inductor L3 and the inductor L5, the other end of the resistor R3 is connected to one end of the capacitor C3, the inductor L4 is connected in series with the inductor L6, one end of the resistor R4 is connected between the inductor L4 and the inductor L6, the other end of the resistor R4 is connected to one end of the capacitor C4, one end of the capacitor C5 is connected to the inductor L5, one end of the capacitor C6 is connected to the inductor L6, and the other ends of the capacitor C5, capacitor C6, capacitor C3 and capacitor C4 are grounded.

[0012] Preferably, the amplifier includes an amplifier U1A and an amplifier U1B, the non-inverting input terminal of the amplifier U1A is connected to the other end of the resistor R3, the inverting input terminal of the amplifier U1A is connected to one end of the resistor R5 and the resistor R6, the other end of the resistor R6 is grounded, the other end of the resistor R5 is connected to the output terminal of the amplifier U1A, and the output terminal of the amplifier U1A is electrically connected to the input terminal of the scanner.

[0013] Preferably, the non-inverting input terminal of the amplifier U1 B is connected to the other end of the resistor R4, the inverting input terminal of the amplifier U1 B is connected to one end of the resistor R7 and the resistor R8, the other end of the resistor R8 is grounded, the other end of the resistor R7 is connected to the output terminal of the amplifier U1 B, and the output terminal of the amplifier U1 B is electrically connected to the input terminal of the scanner.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. By connecting the differential signal line of the analog load to the filter circuit, the noise and interference signal in the circuit can be filtered out. At the same time, the filter circuit can filter out various frequency components in the differential signal, leaving only the components of specific frequencies, so that the detection circuit can easily obtain the electrical signal of electromagnetic radiation.

[0016] 2. At the same time, the electromagnetic radiation of the differential signal line can be acquired through the detection circuit and the amplifier, and the acquired electrical signal can be amplified so that it can be accurately detected and processed by the scanner. The scanner is responsible for converting the detected electromagnetic radiation signal into observable signals, such as voltage, current, etc., which are intuitively displayed through the spectrum analyzer. It can monitor the electromagnetic radiation level in the differential signal line in real time and help users identify and solve potential interference problems.

[0017] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures indicated in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a system block diagram of the utility model;

[0019] Figure 2 This is a circuit diagram of electromagnetic radiation detection of differential signal lines of the utility model. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0021] See also Figures 1-2 , the utility model provides embodiments:

[0022] like Figure 1As shown, an electromagnetic radiation detection circuit for a differential signal line includes an analog load, which is electrically connected to a signal input terminal. The signal input terminal is used to receive a differential signal generated by a simulated working state of the analog load. The signal input terminal includes a signal line P and a signal line N, and the signal line P and the signal line N are differential signal lines.

[0023] like Figure 2 As shown, the signal line P and the signal line N are respectively electrically connected to a filter circuit for filtering the signal, and the filter circuit includes a resistor R1, a resistor R2, a capacitor C1, a capacitor C2 and an inductor L1, and an inductor L2. The capacitor C1, the resistor R1 and the inductor L1 are connected in series, and the capacitor C2, the resistor R2 and the inductor L2 are connected in series. The terminal of the capacitor C1 after the series connection is connected is connected to the signal line P, and the terminal of the capacitor C2 after the series connection is connected is connected to the signal line N, and the inductor L1 and the inductor L2 are grounded.

[0024] The series connection of capacitor C1, resistor R1 and inductor L1 and the series connection of capacitor C2, resistor R2 and inductor L2 are used to form a filtering network for filtering out noise and interference signals in the circuit. At the same time, the filtering circuit can filter out various frequency components in the differential signal and only leave components of specific frequencies.

[0025] like Figure 2 As shown, the signal line P and the signal line N are also electrically connected to a detection circuit for detecting electromagnetic radiation, respectively. The detection circuit includes an inductor L3, an inductor L4, an inductor L5, an inductor L6, a resistor R3, a resistor R4, a capacitor C3, a capacitor C4, a capacitor C5 and a capacitor C6. The inductor L3 is connected in series with the inductor L5, one end of the resistor R3 is connected between the inductor L3 and the inductor L5, the other end of the resistor R3 is connected to one end of the capacitor C3, the inductor L4 is connected in series with the inductor L6, one end of the resistor R4 is connected between the inductor L4 and the inductor L6, the other end of the resistor R4 is connected to one end of the capacitor C4, one end of the capacitor C5 is connected to the inductor L5, one end of the capacitor C6 is connected to the inductor L6, and the other ends of the capacitors C5, C6, C3 and C4 are grounded.

[0026] After the noise and interference signals in the filtering circuit are filtered out by the filtering circuit, the electrical signal with a specific frequency is left and passes through the inductance, capacitance and resistance in the detection circuit. When electromagnetic radiation exists in the differential signal, the detection circuit will output an electrical signal, and the size of the signal is proportional to the intensity of the electromagnetic radiation. The output end of the detection circuit is electrically connected to an amplifier that amplifies the electrical signal, the output end of the amplifier is electrically connected to the input end of the scanner, and the output end of the scanner is electrically connected to the output end of the spectrum analyzer.

[0027] Among them, Figure 2As shown, the amplifier includes an amplifier U1A and an amplifier U1B, the non-inverting input terminal of the amplifier U1A is connected to the other end of the resistor R3, the inverting input terminal of the amplifier U1A is connected to one end of the resistor R5 and the resistor R6, the other end of the resistor R6 is grounded, the other end of the resistor R5 is connected to the output terminal of the amplifier U1A, and the output terminal of the amplifier U1A is electrically connected to the input terminal of the scanner, the non-inverting input terminal of the amplifier U1B is connected to the other end of the resistor R4, the inverting input terminal of the amplifier U1B is connected to one end of the resistor R7 and the resistor R8, the other end of the resistor R8 is grounded, the other end of the resistor R7 is connected to the output terminal of the amplifier U1B, and the output terminal of the amplifier U1B is electrically connected to the input terminal of the scanner.

[0028] Amplifier U1A and amplifier U1B convert the electrical signal output by the detection circuit into a specific amplified frequency component, and the scanner is responsible for converting the detected electromagnetic radiation signal into an observable signal, such as voltage, current, etc. It is intuitively displayed through the spectrum analyzer.

[0029] After the electromagnetic radiation signal of the differential signal line detected by the detection circuit is amplified by the amplifier, the strength of the electrical signal is enhanced to ensure that the electrical signal can be accurately detected and processed by the scanner. The scanner converts the captured electromagnetic radiation signal into an electrical signal and transmits it to the spectrum analyzer for further analysis. The spectrum analyzer receives the electrical signal from the scanner and converts it into a digital signal. The spectrum analyzer can determine the signal strength level at different frequencies by performing spectrum analysis on the digital signal. The spectrum analyzer can display the spectrum diagram of the electromagnetic radiation signal to help users analyze and identify possible interference sources or problems. The collaborative work of the scanner and the spectrum analyzer can monitor the electromagnetic radiation level in the differential signal line in real time and help users identify and solve potential interference problems.

[0030] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electromagnetic radiation detection circuit for a differential signal line, comprising a simulated load, characterized in that: The analog load is electrically connected to a signal input terminal, and the signal input terminal is used to receive a differential signal generated by a simulated working state of the analog load. The signal input terminal includes a signal line P and a signal line N, and the signal line P and the signal line N are respectively electrically connected to a filter circuit for filtering the signal. The signal line P and the signal line N are also respectively electrically connected to a detection circuit for detecting electromagnetic radiation. The output end of the detection circuit is electrically connected to an amplifier for amplifying electrical signals, the output end of the amplifier is electrically connected to the input end of a scanner, and the output end of the scanner is electrically connected to the output end of a spectrometer.

2. The electromagnetic radiation detection circuit for differential signal lines according to claim 1, characterized in that: The filtering circuit includes a resistor R1, a resistor R2, a capacitor C1, a capacitor C2, and an inductor L1, and an inductor L2. The capacitor C1, the resistor R1, and the inductor L1 are connected in series, and the capacitor C2, the resistor R2, and the inductor L2 are connected in series. The terminal of the capacitor C1 connected in series is connected to the signal line P, and the terminal of the capacitor C2 connected in series is connected to the signal line N. The inductor L1 and the inductor L2 are grounded.

3. The electromagnetic radiation detection circuit for differential signal lines according to claim 1, characterized in that: The detection circuit includes an inductor L3, an inductor L4, an inductor L5, an inductor L6, a resistor R3, a resistor R4, a capacitor C3, a capacitor C4, a capacitor C5 and a capacitor C6. The inductor L3 is connected in series with the inductor L5, one end of the resistor R3 is connected between the inductor L3 and the inductor L5, the other end of the resistor R3 is connected to one end of the capacitor C3, the inductor L4 is connected in series with the inductor L6, one end of the resistor R4 is connected between the inductor L4 and the inductor L6, the other end of the resistor R4 is connected to one end of the capacitor C4, one end of the capacitor C5 is connected to the inductor L5, one end of the capacitor C6 is connected to the inductor L6, and the other ends of the capacitors C5, C6, C3 and C4 are grounded.

4. The electromagnetic radiation detection circuit for differential signal lines according to claim 3, characterized in that: The amplifier includes an amplifier U1A and an amplifier U1B, the non-inverting input terminal of the amplifier U1A is connected to the other end of the resistor R3, the inverting input terminal of the amplifier U1A is connected to one end of the resistor R5 and the resistor R6, the other end of the resistor R6 is grounded, the other end of the resistor R5 is connected to the output terminal of the amplifier U1A, and the output terminal of the amplifier U1A is electrically connected to the input terminal of the scanner.

5. The electromagnetic radiation detection circuit for differential signal lines according to claim 4, characterized in that: The non-inverting input terminal of the amplifier U1B is connected to the other end of the resistor R4, the inverting input terminal of the amplifier U1B is connected to one end of the resistor R7 and the resistor R8, the other end of the resistor R8 is grounded, the other end of the resistor R7 is connected to the output terminal of the amplifier U1B, and the output terminal of the amplifier U1B is electrically connected to the input terminal of the scanner.

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