CN100433952C - Cancel circuit for suppressing electromagnetic interference of high-speed circuit - Google Patents
Cancel circuit for suppressing electromagnetic interference of high-speed circuit Download PDFInfo
- Publication number
- CN100433952C CN100433952C CNB001348396A CN00134839A CN100433952C CN 100433952 C CN100433952 C CN 100433952C CN B001348396 A CNB001348396 A CN B001348396A CN 00134839 A CN00134839 A CN 00134839A CN 100433952 C CN100433952 C CN 100433952C
- Authority
- CN
- China
- Prior art keywords
- circuit
- phase
- electromagnetic interference
- high speed
- bucking
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Noise Elimination (AREA)
Abstract
The present invention relates to an interference counteracting circuit for suppressing the electromagnetic interference of a high-speed circuit, in which differential signals are used to counteract magnetic fields and couple electric fields under the condition that signal quality is not affected, the differential signals have the principle that another running cable is arranged beside the original high-speed circuit; the phase of the running cable needs to be shifted through a phase shifter so as to generate a differential effect. A running cable mode provided by the present invention comprises a closely attaching mode of the same layer, a tortuous mode and a stacking mode of vertical layers.
Description
The present invention relates to a kind of bucking circuit that suppresses the high speed circuit electromagnetic interference, particularly a kind of bucking circuit of utilizing differential wave to reach magnetic field cancellation and field coupled.
(Electromagnetic Compatibility EMC), just need consider circuit design such as power supply, holding wire, comparison signal, digital signal, electric cabinet and operation cabinet when design electronic products for the Electro Magnetic Compatibility that improves electronic product.Wherein, indispensable circuit is a filter circuit, and filter circuit comprises: decoupling capacitance (Decoupling capacitors), filter capacitor (Filtercapacitors) and shunt capacitance (Bypass capacitors) etc.Signal on the printed circuit board (PCB) (PCB) improves (bringing up to 133MHz by 33MHz) day by day, the filter (comprising the RC filter of resistance capacitance or the LC filter of inductance capacitance) that generally is used for signal under the situation that may influence signal quality, can't satisfy the counteracting purpose of high speed circuit electromagnetic interference.
Based on the above-mentioned filter of mentioning, can have a strong impact on the high speed circuit signal quality, use differential wave (differential Signals) solving the counteracting purpose of high speed circuit electromagnetic interference, a kind of really feasible mode.But the circuit major part of high speed signal is single-ended signal (Single-endedSignal) at present, can't accomplish with differential wave to produce the purpose that electromagnetic interference is offset.
The purpose of this invention is to provide a kind of bucking circuit that suppresses the high speed circuit electromagnetic interference, make and under the situation that the signal frequency on the printed circuit board (PCB) (PCB) improves day by day, still can offset electromagnetic interference, improve the Electro Magnetic Compatibility of electronic product.
According to first aspect of the present invention, a kind of bucking circuit that suppresses the high speed circuit electromagnetic interference is provided, this bucking circuit comprises: a phase shifter (phase shifter) is used for the signal phase shift; A high-speed signal circuit, described circuit are the circuit of single-ended signal (Single-ended signal); And a differential wave circuit, described circuit is via glitch (DummySignal) circuit after the above-mentioned phase shifter phase shift, and the contiguous described high-speed signal circuit of this differential wave circuit, in order to produce magnetic field cancellation and field coupled.
Provide a kind of bucking circuit that suppresses the high speed circuit electromagnetic interference according to second aspect of the present invention, comprise: form the differential wave circuit after utilizing a glitch (Dummy Signal) circuit via a phase shifter phase shift, and the contiguous described high-speed signal circuit of described differential wave circuit, in order to producing differential effect, and then produce the effect of magnetic field cancellation and field coupled.
Cabling mode provided by the present invention is included in one deck is close to the mode cabling of mode cabling, dioptric type and the folded mutually mode cabling of different layers up and down.
Advantage of the present invention is to utilize simple circuit and structure to realize a kind of bucking circuit that suppresses the high speed circuit electromagnetic interference, has improved the Electro Magnetic Compatibility of electronic product, and then has improved the quality of electronic product.
Below with reference to Figure of description detailed content of the present invention and technology are described.
Fig. 1 represents the combiner circuit trace-diagram of the embodiment of the invention;
Figure 1A is that the electromagnetic field of the combiner circuit cabling of the embodiment of the invention is offset and the schematic diagram of leakage field intensity;
Fig. 2 is the combiner circuit trace-diagram of the preferred embodiments of the present invention; With
Fig. 3 A-3H is the schematic diagram of prior art phase shifter.
Each label in the Figure of description is represented following implication respectively:
10: element A
20: element B
30: cabling C
40: cabling D
50: phase shifter (phase shifter)
55: dummy load
60: offset most electromagnetic field
70: leakage field intensity (stray fringing fields)
The present invention proposes a kind of bucking circuit that suppresses the high speed circuit electromagnetic interference, this bucking circuit is to arrange a cabling in addition again on original high-speed signal circuit next door, but this new cabling needs elder generation through a phase shifter (phase shifter) phase shift, produces differential effect in artificial mode.Fig. 1 is the trace-diagram of the combiner circuit of the embodiment of the invention, wherein element A 10 is to utilize the HW High Way of cabling 30 to be connected with element B 20, cabling 40 is a virtual signal (DummySignal) circuit that connect via phase shifter 50 phase shifts, this circuit is connected to a dummy load (Dummy Load) 55 and makes its ground connection, this dummy load (Dummy Load) 55 can be the combination of the passive component of an electricity group or an electric capacity and so on, cabling 30 and 40 liang of lines of cabling are close to produce phase difference, and then reach the effect that generates an electromagnetic field and offset, wherein the scope of phase difference can produce the different phase shift from 90 ° to 180 ° according to the design of phase shifter 50 circuit.This differential wave can reach the purpose of magnetic field cancellation and field coupled according to right hand Ampere's law (shown in Figure 1A), wherein under the prerequisite of not damaging signal quality
The sense of current (finger) for cabling 30 into paper, ⊙ is the sense of current (pointing out paper) of cabling 40, so under the near field, offset most electromagnetic field 60, having only a spot of spuious leakage field intensity (stray fringing fields) 70 can be emitted to the far field becomes plane wave, so can reduce electromagnetic radiation significantly.
In order to strengthen negative function, the cabling mode on PCB more provides a kind of preferred cabling mode, as shown in Figure 2, is the combiner circuit trace-diagram of the preferred embodiments of the present invention.The mode of this combiner circuit cabling is the mode cabling with dioptric type, and neutralization effect preferably is provided.The present invention except provide above-mentioned two kinds on PCB the combiner circuit cabling mode with layer, also propose a kind ofly at the cabling mode of different layers up and down, also can reach the negative function (not expressing among the figure) of electromagnetic field.
The pattern of phase shifter of the present invention can be selected from any in the various types of the prior art phase shifter among Fig. 3 A-3H.The phase shifter that wherein comprises the orthoscopic delay line type (Straight delayline) of Fig. 3 A, the phase shifter of the dioptric type delay line type of Fig. 3 B (Meander-line delay line), the T formula of Fig. 3 C engages the phase shifter of phase type (T-junction phase), the phase shifter of the serial connection phase type of Fig. 3 D (Series phase), the phase shifter of the serial connection PIN phase type of Fig. 3 E (Series PIN diodephase), the phase shifter of the shunting phase type of Fig. 3 F (Shunt phase), the phase shifter of the phase shifter of the shunting PIN diode phase type of Fig. 3 G (Shunt PIN diode phase) and the ferroelectric phase bit-type (Ferroelectric phase) of Fig. 3 H etc.
Though the present invention has carried out above-mentioned description in the mode of preferred embodiment; but for the professional and technical personnel; under the situation that does not break away from the spirit and scope that limit by claims of the present invention; may make various modifications and change, thereby protection scope of the present invention is as the criterion by accompanying Claim book institute restricted portion.
Claims (20)
1. bucking circuit that suppresses the high speed circuit electromagnetic interference, this bucking circuit is characterised in that and comprises:
One phase shifter is used for the signal phase shift;
One high-speed signal circuit, described circuit are the circuit of single-ended signal; And
One differential wave circuit, described circuit are via the glitch circuit after the above-mentioned phase shifter phase shift, and the contiguous described high-speed signal circuit of this differential wave circuit, in order to produce magnetic field cancellation and field coupled.
2. the bucking circuit of inhibition high speed circuit electromagnetic interference as claimed in claim 1, the pattern of wherein said phase shifter are the phase shifters of orthoscopic delay line type.
3. the bucking circuit of inhibition high speed circuit electromagnetic interference as claimed in claim 1, the pattern of wherein said phase shifter are the phase shifters of dioptric type delay line type.
4. the bucking circuit of inhibition high speed circuit electromagnetic interference as claimed in claim 1, the pattern of wherein said phase shifter are the phase shifters that the T formula engages phase type.
5. the bucking circuit of inhibition high speed circuit electromagnetic interference as claimed in claim 1, the pattern of wherein said phase shifter are the phase shifters of serial connection phase type.
6. the bucking circuit of inhibition high speed circuit electromagnetic interference as claimed in claim 1, the pattern of wherein said phase shifter are the phase shifters of serial connection PIN diode phase type.
7. the bucking circuit of inhibition high speed circuit electromagnetic interference as claimed in claim 1, the pattern of wherein said phase shifter are the phase shifters of shunting phase type.
8. the bucking circuit of inhibition high speed circuit electromagnetic interference as claimed in claim 1, the pattern of wherein said phase shifter are the phase shifters of shunting PIN diode phase type.
9. the bucking circuit of inhibition high speed circuit electromagnetic interference as claimed in claim 1, the pattern of wherein said phase shifter are the phase shifters of ferroelectric phase bit-type.
10. the bucking circuit of inhibition high speed circuit electromagnetic interference as claimed in claim 1, the mode of the contiguous described high-speed signal circuit of wherein said differential wave circuit are selected from the mode cabling of being close to mode cabling, dioptric type with one deck and different layers up and down any in the compound mode of folded mode cabling mutually.
11. a bucking circuit that suppresses the high speed circuit electromagnetic interference is characterized in that:
Form the differential wave circuit after utilizing a glitch circuit via a phase shifter phase shift, and the contiguous described high-speed signal circuit of described differential wave circuit, in order to producing differential effect, and then produce the effect of magnetic field cancellation and field coupled.
12. the bucking circuit of inhibition high speed circuit electromagnetic interference as claimed in claim 11, the pattern of wherein said phase shifter are the phase shifters of orthoscopic delay line type.
13. the bucking circuit of inhibition high speed circuit electromagnetic interference as claimed in claim 11, the pattern of wherein said phase shifter are the phase shifters of dioptric type delay line type.
14. the bucking circuit of inhibition high speed circuit electromagnetic interference as claimed in claim 11, the pattern of wherein said phase shifter are the phase shifters that the T formula engages phase type.
15. the bucking circuit of inhibition high speed circuit electromagnetic interference as claimed in claim 11, the pattern of wherein said phase shifter are the phase shifters of serial connection phase type.
16. the bucking circuit of inhibition high speed circuit electromagnetic interference as claimed in claim 11, the pattern of wherein said phase shifter are the phase shifters of serial connection PIN diode phase type.
17. the bucking circuit of inhibition high speed circuit electromagnetic interference as claimed in claim 11, the pattern of wherein said phase shifter are the phase shifters of shunting phase type.
18. the bucking circuit of inhibition high speed circuit electromagnetic interference as claimed in claim 11, the pattern of wherein said phase shifter are the phase shifters of shunting PIN diode phase type.
19. the bucking circuit of inhibition high speed circuit electromagnetic interference as claimed in claim 11, the pattern of wherein said phase shifter are the phase shifters of ferroelectric phase bit-type.
20. the bucking circuit of inhibition high speed circuit electromagnetic interference as claimed in claim 11, the mode of the contiguous described high-speed signal circuit of wherein said differential wave circuit are selected from the mode cabling of being close to mode cabling, dioptric type with one deck and different layers up and down any in the compound mode of folded mode cabling mutually.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001348396A CN100433952C (en) | 2000-11-30 | 2000-11-30 | Cancel circuit for suppressing electromagnetic interference of high-speed circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001348396A CN100433952C (en) | 2000-11-30 | 2000-11-30 | Cancel circuit for suppressing electromagnetic interference of high-speed circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1355667A CN1355667A (en) | 2002-06-26 |
| CN100433952C true CN100433952C (en) | 2008-11-12 |
Family
ID=4596444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001348396A Expired - Fee Related CN100433952C (en) | 2000-11-30 | 2000-11-30 | Cancel circuit for suppressing electromagnetic interference of high-speed circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100433952C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1855750B (en) * | 2005-04-20 | 2010-09-01 | 周宗善 | Anti-interfere mono-end signal transmitting method and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4970625A (en) * | 1987-03-23 | 1990-11-13 | Digital Equipment Corporation | Integrated module handle and chassis bulkhead for reducing electromagnetic interference emissions from circuit modules |
| CN2159632Y (en) * | 1993-04-30 | 1994-03-23 | 航空航天工业部第六一五研究所 | Electromagnetic interruption filter |
| US5684340A (en) * | 1995-02-24 | 1997-11-04 | Hewlett-Packard Company | Arrangement for preventing electromagnetic interference |
-
2000
- 2000-11-30 CN CNB001348396A patent/CN100433952C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4970625A (en) * | 1987-03-23 | 1990-11-13 | Digital Equipment Corporation | Integrated module handle and chassis bulkhead for reducing electromagnetic interference emissions from circuit modules |
| CN2159632Y (en) * | 1993-04-30 | 1994-03-23 | 航空航天工业部第六一五研究所 | Electromagnetic interruption filter |
| US5684340A (en) * | 1995-02-24 | 1997-11-04 | Hewlett-Packard Company | Arrangement for preventing electromagnetic interference |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1355667A (en) | 2002-06-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2080265B1 (en) | Filter package | |
| EP0470031B1 (en) | Circuit board EMI suppressor | |
| JP5354949B2 (en) | Printed circuit board | |
| CN106664070A (en) | Phase shifter, impedance matching circuit, multiplexer/demultiplexer and communication terminal device | |
| US20080309431A1 (en) | Planar emi filter | |
| KR20050048606A (en) | Common mode signal suppressing circuit and normal mode signal suppressing circuit | |
| JP2008245037A (en) | Noise filter | |
| US5132650A (en) | Lc noise filter | |
| CN100433952C (en) | Cancel circuit for suppressing electromagnetic interference of high-speed circuit | |
| CN100367711C (en) | Network interface with filtering device | |
| CN108337016A (en) | It is a kind of to generate the far-end cross talk removing method for adding crosstalk | |
| CN210351773U (en) | Differential wiring circuit, circuit board, functional module and mobile terminal | |
| CN111711355A (en) | Switching power supply circuit for inhibiting conduction radiation | |
| JP2015033119A (en) | Printed circuit board | |
| CN1314777A (en) | Counteraction circuit for controlling high speed line electromagnetic interference | |
| US6429749B1 (en) | Cancellation circuit that suppresses electromagnetic interference in a high speed circuit | |
| CN212572383U (en) | Switching power supply circuit for suppressing conduction radiation | |
| CN107069730A (en) | High current is without magnetic core EMC wave filters | |
| CN1355666A (en) | Cancel circuit using signal generator to suppress electromagnetic interference of high-speed circuit | |
| JP6108690B2 (en) | Differential transmission circuit and electronic equipment | |
| CN206313658U (en) | High current insertion loss electromagnetic interface filter high | |
| CN1247062C (en) | Bucking-out circuit for suppressing electromagnetic interference of high-speed circit | |
| CN1402603A (en) | Method for improving inverter line of suppressing high-speed line electromagnetic interference | |
| CN209345008U (en) | EMC filter | |
| Shim et al. | Decoupling strategies for printed circuit boards without power planes |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |