CN211720553U - Circuit for inhibiting radiation and electronic equipment - Google Patents
Circuit for inhibiting radiation and electronic equipment Download PDFInfo
- Publication number
- CN211720553U CN211720553U CN202020453230.4U CN202020453230U CN211720553U CN 211720553 U CN211720553 U CN 211720553U CN 202020453230 U CN202020453230 U CN 202020453230U CN 211720553 U CN211720553 U CN 211720553U
- Authority
- CN
- China
- Prior art keywords
- circuit
- branch
- radiation
- inverting
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model discloses a restrain circuit and electronic equipment of radiation, circuit and signal transmission line parallel connection are between signal source and load end, the circuit includes: the phase inverting branch and the phase adjusting branch are connected in series; and the input end of the inverting branch is connected with the signal source Vsg, the output end of the inverting branch is connected with the phase adjusting branch, and the transmitting end of the inverting branch is grounded. The embodiment of the utility model provides an utilize the opposite phase branch road to produce the wave form opposite with single-ended signal, furthest offsets the radiation Interference of the production in the single-ended signal transmission process to utilize the phase adjustment branch road to adjust the time delay of opposite phase branch road, show the radiation characteristic who reduces single-ended clock signal, even make single-ended clock signal lay on the top layer of circuit board, also can pass through EMI (Electromagnetic Interference) regulation limit value requirement. Therefore, the wiring scheme design flexibility of the electronic product is greatly improved, the use of EMI inhibiting materials can be avoided, and the product cost is effectively reduced.
Description
Technical Field
The utility model relates to the field of communication technology, especially, relate to a circuit and electronic equipment who restraines radiation.
Background
The single-ended signal is taken as a periodic signal, the spectrum energy corresponding to the FFT (Fast Fourier Transform) is concentrated in a few frequency points, and the energy of a single frequency point is concentrated. Furthermore, the single-ended signal return path needs to be returned through ground, so that the single-ended clock signal radiation is very high. Therefore, in the signal transmission process, the alternating signal can generate an induction electromagnetic field in the transmission line direction, and the induction electromagnetic field can induce induction electromagnetic waves to radiate to the space, so that the radiation problem is caused.
For the above problems, several solutions are currently adopted: 1. the scheme of reducing radiation by using the wave-absorbing material is high in cost, occupies a large space and has large influence on a radiating surface. 2. Metal shields are used to control radiation, but metal shields are also costly and can adversely affect heat dissipation. 3. Filters are used to reduce radiation, but capacitive bypass filtering, inductive filtering, bead filtering, and combination filters can adversely affect SI (Signal Integrity). 4. The Strip line method is adopted for PCB wiring, but the wiring method has high requirements on PCB space and board layers, and Strip line wiring cannot be performed in most cases due to board layer limitation.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides an above-mentioned problem that exists in order to solve single-ended signal transmission process creatively provides a circuit that restraines radiation.
According to the utility model discloses a first aspect provides a restrain circuit of radiation, circuit and signal transmission line parallel connection are between signal source and load end, the circuit includes: the phase inverting branch and the phase adjusting branch are connected in series; and the input end of the inverting branch is connected with a signal source Vsg, and the output end of the inverting branch is connected with the phase adjusting branch.
According to the utility model discloses an embodiment, the reverse branch road includes: the amplifier Q is an NPN amplifier.
According to an embodiment of the present invention, the base Qb of the amplifier Q is used as the input end of the inverting branch and is connected to the signal source Vsg; the collector Qc is used as the output end of the inverting branch and is connected with a power supply Vcc; the emitter Qe is grounded.
According to an embodiment of the present invention, the inverting branch further comprises: and the bias resistor Rb is connected between the signal source Vsg and the base Qb in series.
According to an embodiment of the present invention, the inverting branch further comprises: and a degeneration resistor Rc connected in series between the power source Vcc and the collector electrode Qc.
According to an embodiment of the present invention, the inverting branch further comprises: and one end of the decoupling capacitor C is connected with the collector electrode Qc, and the other end of the decoupling capacitor C is grounded.
According to the utility model discloses an embodiment, the phase place adjustment branch road includes: and one end of the inductor L is connected with the output end of the inverting branch circuit, and the other end of the inductor L is connected with the load end.
According to the second aspect of the present invention, there is also provided an electronic device including the above-described circuit for suppressing radiation.
According to an embodiment of the present invention, the circuit for suppressing radiation is connected in parallel to a signal transmission line in the electronic device.
The embodiment of the utility model provides an utilize the opposite phase branch road to produce the wave form opposite with single-ended signal, furthest offsets the radiation Interference of the production in the single-ended signal transmission process to utilize the phase adjustment branch road to adjust the time delay of opposite phase branch road, show the radiation characteristic who reduces single-ended clock signal, even make single-ended clock signal lay on the top layer of circuit board, also can pass through EMI (Electromagnetic Interference) regulation limit value requirement. Therefore, the wiring scheme design flexibility of the electronic product is greatly improved, the use of EMI inhibiting materials can be avoided, and the product cost is effectively reduced.
It is to be understood that the teachings of the present invention need not achieve all of the above-described benefits, but rather that certain aspects may achieve certain technical results, and that other embodiments of the present invention may achieve other benefits not mentioned above.
Drawings
The above and other objects, features and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present invention are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which:
in the drawings, the same or corresponding reference numerals indicate the same or corresponding parts.
Fig. 1 shows a schematic diagram one of a circuit for suppressing radiation according to an embodiment of the present invention;
fig. 2 shows a schematic diagram ii of a circuit for suppressing radiation according to an embodiment of the present invention.
Detailed Description
The principles and spirit of the present invention will be described with reference to a number of exemplary embodiments. It should be understood that these embodiments are given only for the purpose of enabling those skilled in the art to better understand and to implement the invention, and are not intended to limit the scope of the invention in any way. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The technical solution of the present invention will be further elaborated with reference to the accompanying drawings and specific embodiments.
Fig. 1 shows a schematic diagram of a circuit for suppressing radiation according to an embodiment of the present invention.
Referring to fig. 1, the circuit 10 for suppressing radiation according to the embodiment of the present invention is connected in parallel to the signal transmission line 20 between the signal source Vsg and the Load terminal Load, and the circuit 10 includes: an inverting branch 11 and a phase adjusting branch 12 connected in series; and the input terminal of inverting branch 11 is connected to signal source Vsg and the output terminal of inverting branch 11 is connected to phase adjusting branch 12.
In particular, a single-ended signal produces higher radiation because the alternation of the single-ended signal produces an alternating electromagnetic field that produces an alternating electromagnetic wave, thereby causing radiation. The utility model discloses an increase a branch parallel with signal transmission line at single-ended clock signal, produce with signal source waveform phase opposite's signal, offset each other through the electromagnetic wave that the electromagnetic induction law radiated out on to signal transmission line. Thereby achieving the purpose of inhibiting radiation.
For example, a phase inverting branch (e.g., an inverter) may be utilized to cause the signal source Vsg to be in phase opposition to the voltage of the signal transmitted on the signal transmission line 20 at the radiation-rejecting circuit 10. Since the radiation-suppressing circuit 10 is parallel to the signal transmission line 20 between the signal source Vsg and the Load, it can be known from the law of electromagnetic induction that the electromagnetic field generated on the radiation-suppressing circuit 10 and the electromagnetic field generated on the signal transmission line 20 can cancel each other out, thereby preventing the signal source Vsg from radiating electromagnetic waves to the surroundings when transmitting signals on the signal transmission line 20.
Furthermore, when the signal of the signal source Vsg is inverted by the inverting adjusting branch 11 (e.g. an inverter), it is amplified and thus a certain signal delay is generated. At this time, the phase adjustment is performed through the phase adjustment branch, so that the phase of the signal transmitted on the circuit 10 for suppressing radiation is opposite to that of the signal transmitted on the signal transmission line 20, and thus, a better radiation suppression effect can be achieved.
In an embodiment of the present invention, the width between the radiation-suppressing circuit 10 and the signal transmission line 20 is about 3 times of the line width, and 3 times of the line width is more suitable, and the line width is a common concept in the process of wiring electronic products (for example, PCB wiring design).
Fig. 2 shows a schematic diagram ii of a circuit for suppressing radiation according to an embodiment of the present invention.
Referring to fig. 2, the utility model discloses the circuit of restraining radiation carries out the opposition and enlargies signal source Vsg's signal through the amplifier Q of inverting branch 11, carries out the phase adjustment through the inductance L of phase adjustment branch 12 again.
In an embodiment of the present invention, the inverting branch 11 includes: and the amplifier Q is an NPN amplifier.
In one embodiment, the operating frequency of the transistor in the circuit can be adapted to most single-ended signal transmission processes.
In an embodiment of the present invention, the inverting function of the amplifier Q is realized by the following circuit connection method. Specifically, a base Qb of the amplifier Q is connected with a signal source Vsg; collector Qc serves as the output terminal of inverting branch 11 and is connected to power supply Vcc; the emitter Qe is grounded.
For example, when the signal from the signal source Vsg is low, the NPN amplifier Q is turned on, and a current flows between the power source Vcc and the collector Qc of the NPN amplifier, so that the voltage signal at the connection point a is high. On the contrary, when the signal from the signal source Vsg is at a high level, the amplifier Q is turned off, no current flows between the power source Vcc and the collector Qc of the amplifier, and the voltage signal at the connection point a is at a low level. As a result, a signal having the same value as the signal source Vsg and the opposite direction is generated after passing through the inverting branch 11. That is, the waveform of the signal transmitted through the circuit for suppressing radiation is opposite to the waveform of the signal transmitted through the transmission signal line 20, and the waveforms can be cancelled out to suppress radiation.
In an embodiment of the present invention, the inverting branch 11 further includes: and the bias resistor Rb is connected between the signal source Vsg and the base Qb in series.
In an embodiment of the present invention, the inverting branch 11 further includes: and a degeneration resistor Rc connected in series between the power supply Vcc and the collector Qc.
In an embodiment of the present invention, the inverting branch 11 further includes: and one end of the decoupling capacitor C is connected with the collector electrode Qc, and the other end of the decoupling capacitor C is grounded.
In an embodiment of the present invention, the phase adjustment branch 12 includes: and one end of the inductor L is connected with the output end of the inverting branch 11, and the other end of the inductor L is connected with the Load end.
Specifically, the embodiment of the present invention provides a circuit for suppressing radiation, which needs to be extended to the end of a signal transmission line as far as possible in order to cancel the signal transmission line to the maximum extent. For example, signal transmission is performed between two chips, and a signal transmission line X is provided between a signal output terminal Vout1 of the chip P1 and a signal input terminal Vin1 of the chip P2. Vout1 in the embodiment of the present invention may be used as the signal source Vsg with reference to fig. 2, or Vout1 may be connected to Vsg. The connection point b at the rear end of the inductor L is connected to the signal input terminal Vin1 of the chip P2.
In an embodiment of the present invention, the inverting branch 11 includes: the NPN amplifier Q has a base Qb connected to the signal source Vsg, a collector Qc serving as an output terminal of the inverting branch 11 and connected to the power source Vcc, and an emitter Qe grounded. And the bias resistor Rb is connected between the signal source Vsg and the base Qb in series. And a degeneration resistor Rc connected in series between the power supply Vcc and the collector Qc. And one end of the decoupling capacitor C is connected with the collector electrode Qc, and the other end of the decoupling capacitor C is grounded. When the decoupling capacitor C is connected to the collector Qc, it is necessary to connect the decoupling capacitor C to the collector Qc, and the connection point between the decoupling capacitor C and the collector Qc is located between the degeneration resistor Rc and the power supply, as shown in fig. 2.
Adopt Ansys EM (a simulation software name) to carry out the modeling simulation, select for use the material of micro strip 5000 mil's FR4 specification to the scheme 1 of circuit board normal wiring and add the utility model discloses the circuit that restraines the radiation carries out scheme 2 of wiring and carries out the simulation of electric field radiation intensity respectively. Simulated values of the electric field radiation at 10 m distance of the circuit wired with both schemes are compared, as shown in table 1 below:
TABLE 1
| Scheme(s) | Frequency (MHz) | 10 m place field strength dB (V/m) |
| Scheme 1 | 600 | -57.2 |
| Scheme 2 | 600 | -51.8 |
Therefore, the simulation result of the far field electric field radiation (V/m) after the scheme is adopted is determined to be 6dB lower than the simulation result without the scheme.
The embodiment of the utility model provides an utilize the opposite phase branch road to produce the wave form opposite with single-ended signal, furthest offsets the radiation Interference of the production in the single-ended signal transmission process to utilize the phase adjustment branch road to adjust the time delay of opposite phase branch road, show the radiation characteristic who reduces single-ended clock signal, even make single-ended clock signal lay on the top layer of circuit board, also can pass through EMI (Electromagnetic Interference) regulation limit value requirement. Therefore, the wiring scheme design flexibility of the electronic product is greatly improved, the use of EMI inhibiting materials can be avoided, and the product cost is effectively reduced.
According to the utility model discloses the second aspect still provides an electronic equipment, and electronic equipment includes the above-mentioned circuit that suppresses the radiation.
According to an embodiment of the present invention, a circuit for suppressing radiation is connected in parallel to a signal transmission line in an electronic device.
The detailed description and the advantageous effects of the electronic device of the present invention are not repeated herein for saving space, referring to the above description of the circuit for suppressing radiation in fig. 1-2.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of a unit is only one logical function division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units; can be located in one place or distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The above embodiments are only specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, and all should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A circuit for suppressing radiation, the circuit being connected in parallel with a signal transmission line between a signal source and a load terminal, the circuit comprising:
the phase inverting branch and the phase adjusting branch are connected in series; and is
The input end of the inverting branch is connected with a signal source Vsg, and the output end of the inverting branch is connected with the phase adjusting branch.
2. The circuit of claim 1, wherein the inverting branch comprises:
the amplifier Q is an NPN amplifier.
3. The circuit of claim 2,
the base Qb of the amplifier Q is used as the input end of the inverting branch and is connected with the signal source Vsg;
the collector Qc is used as the output end of the inverting branch and is connected with a power supply Vcc;
the emitter Qe is grounded.
4. The circuit of claim 3, wherein the inverting branch further comprises:
and the bias resistor Rb is connected between the signal source Vsg and the base Qb in series.
5. The circuit of claim 3, wherein the inverting branch further comprises:
and a degeneration resistor Rc connected in series between the power source Vcc and the collector electrode Qc.
6. The circuit of claim 3, wherein the inverting branch further comprises:
and one end of the decoupling capacitor C is connected with the collector electrode Qc, and the other end of the decoupling capacitor C is grounded.
7. The circuit of claim 1, wherein the phase adjustment branch comprises:
and one end of the inductor L is connected with the output end of the inverting branch circuit, and the other end of the inductor L is connected with the load end.
8. An electronic device, characterized in that the electronic device comprises: the radiation-suppressing circuit of any one of claims 1-7.
9. The electronic device of claim 8, wherein the radiation-suppressing circuit is connected in parallel with a signal transmission line in the electronic device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020453230.4U CN211720553U (en) | 2020-03-31 | 2020-03-31 | Circuit for inhibiting radiation and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020453230.4U CN211720553U (en) | 2020-03-31 | 2020-03-31 | Circuit for inhibiting radiation and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211720553U true CN211720553U (en) | 2020-10-20 |
Family
ID=72835071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020453230.4U Active CN211720553U (en) | 2020-03-31 | 2020-03-31 | Circuit for inhibiting radiation and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211720553U (en) |
-
2020
- 2020-03-31 CN CN202020453230.4U patent/CN211720553U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100254866B1 (en) | Sub power plane to provide emc filtering for vlsi devices | |
| YU46898B (en) | CONTROL DEVICE FOR ELECTRONIC DETECTION OF FAULTS WITH ENERGY LOSSES AT AC TRANSMISSION LINES | |
| US9257955B2 (en) | Common mode noise reduction circuit | |
| WO1991007798A1 (en) | A protective device for computers and the like, adapated to prevent the pick up, the recording and the unauthorized use of data from the computers during the working thereof, and to protect them against high energy transient disturbances taking place on the main a.c. power line | |
| CN101005730A (en) | Circuit board for reducing electromagnetic interference of electronic product | |
| CN211720553U (en) | Circuit for inhibiting radiation and electronic equipment | |
| JP2845210B2 (en) | Ground configuration to reduce electromagnetic radiation | |
| US4760355A (en) | Electromagnetic emission control system | |
| CN111711355A (en) | Switching power supply circuit for inhibiting conduction radiation | |
| US20120081869A1 (en) | Printed circuit board for reducing crosstalk | |
| CN106656115B (en) | Long-distance clock signal EMI suppression circuit | |
| CN212572383U (en) | Switching power supply circuit for suppressing conduction radiation | |
| WO2015177746A1 (en) | Active emi differential mode line filter | |
| US11283485B2 (en) | Circuit for signal connection, device for inductive power transfer and for signal transmission | |
| CN113221497A (en) | Crystal oscillator circuit of PCB board | |
| CN218587073U (en) | Circuit for eliminating electromagnetic interference | |
| White et al. | Taming EMI in microprocessor systems: the authors propose a systematic approach to limiting the effects of electromagnetic interference | |
| Virdi et al. | Enhancement of PCB Design for Radiated Immunity Compliance in Analog Signal Measurement | |
| CN206481279U (en) | Long range clock signal EMI suppression circuits | |
| Carter | Circuit board layout techniques | |
| CN202759438U (en) | Circuit board layout structure of wireless emission module | |
| CN220326153U (en) | Device for shielding electromagnetic interference of crystal oscillator and PCB | |
| CN218633700U (en) | Interference suppression circuit and air conditioner | |
| CN217563850U (en) | Anti-interference radio frequency PCB board | |
| Motorola | System design and layout techniques for noise reduction in MCU-based systems |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |