CN105515564A - Spiral resonant ring ultra-wideband simultaneous switching noise suppression power distribution network - Google Patents
Spiral resonant ring ultra-wideband simultaneous switching noise suppression power distribution network Download PDFInfo
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- CN105515564A CN105515564A CN201510885977.0A CN201510885977A CN105515564A CN 105515564 A CN105515564 A CN 105515564A CN 201510885977 A CN201510885977 A CN 201510885977A CN 105515564 A CN105515564 A CN 105515564A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/003—Modifications for increasing the reliability for protection
- H03K19/00346—Modifications for eliminating interference or parasitic voltages or currents
Abstract
The invention discloses a spiral resonant ring ultra-wideband simultaneous switching noise suppression power distribution network, and aims to provide a power distribution network having the advantages of simple structure, high engineering realizability, no need of slotting a power supply plane, no need of any periodical electromagnetic band gap structure and large simultaneous switching noise suppression depth. The technical scheme for realizing the power distribution network is characterized in that a printed circuit board (PCB) structure is adopted for the power distribution network; local isolating structures are positioned in areas where a noise source input circuit and a noise sensitive circuit on a power supply plane structure are positioned respectively, and etched with spiral resonant rings; the spiral resonant rings are etched on the power supply plane according to a power supply plane distribution structure in order to isolate simultaneous switching noise between a power supply and a ground plane; and an attenuation band is formed in a band frequency band through the resonant effects of the spiral resonant rings in conjunction with coupling resonance among the power supply plane, a ground plane metal layer and a dielectric layer, so that a transmission path of the simultaneous switching noise is blocked; surface waves are suppressed; and the simultaneous switching noise is suppressed.
Description
Technical field
The present invention relates to Power Integrity and high speed circuit microwave technical field, a kind of spiral resonant ring ultra broadband simultaneous switching noise based on the isolation of local resonance suppresses power distribution network, and the present invention can be widely used in high speed electronics equipment.
Background technology
Along with the development of Modern High-Speed digital circuit, quick edge climbing speed, the reasons such as high clock rate and low voltage level make the simultaneous switching noise between power plane and ground level (SSN:SimultaneousSwitchingNoise) problem become more and more outstanding.When simultaneous switching noise is the electric current Simultaneous Switching by the multiple active devices on printed circuit board (PCB) (PCB), between power plane and ground level, multiple mode of resonance causes, and simultaneous switching noise can cause the problem such as signal integrity and electromagnetic compatibility.Along with the increase day by day of Modern High-Speed, high-performance digital systems demand, the features such as the quick edge climbing speed that such digital system has, high clock rate and low voltage level make simultaneous switching noise (SSN) problem produced between power plane and ground level become the Main Bottleneck of its development of restriction and application.And Circuits System is towards the trend development of high speed, low-voltage, low-power consumption, to obtain less volume and the performance of Geng Gao in the module integrations a to circuit module such as numeral, simulation and radio frequency.The raising of system capability has caused larger switching current, when the electric current Simultaneous Switching of the multiple active devices on printed circuit board (PCB) (PCB), the multiple mode of resonance existed between power plane and ground level will cause the generation of simultaneous switching noise, and the simultaneous switching noise produced can cause the appearance of the problems such as the relevant issues of signal integrity and electromagnetic interference, the power supply capacity of power distribution network is had higher requirement and has caused more serious power supply noise fluctuations.Power distribution network is the basis of high-speed digital circuit system, directly affects signal integrity, the performance of Power Integrity and electromagnetism integrality, therefore power distribution network for digital circuit electric charge is provided while also for noise provides excellent propagation path, therefore power distribution network should ensure the impact of power supply performance restraint speckle again, the design and analysis of power distribution network always is the emphasis of research, therefore, oneself becomes inevitable research theme how effectively to suppress the generation of the simultaneous switching noise in high speed circuit, also the difficult problem that circuit designer must solve is become.
Tradition reduces the method for line lock switching noise mainly with adding local, overall decoupling capacitor, embedded decoupling capacitor is added between power plane and ground level, power supply or ground level etch fold-type stria, segmentation plane is by noise isolation, or the method such as the periodicity prolongation structure adding isomorphism or isomery in power plane is main.
As at exercise question being in " design of high speed circuit power distribution network and Power Integrity analysis " paper, author's local area, what overall situation decoupling capacitor suppressed Power Integrity and simultaneous switching noise is studied, at noise-sensitive circuit, some capacitors are placed around device, it is protected from the noise transmission of interplanar resonance, for SSN provides impedance path, it is prevented to be diffused into other region, thus form one noise isolation wall, when frequency is higher than 600MHz, owing to there is stray inductance in decoupling capacitor, stray inductance meeting and capacitor produce self-resonance, thus limit frequency bandwidth, usually when decoupling capacitor is applied to higher than invalid during 600MHz frequency.But typical SSN has the low pass spectrum lower than 6GHz, therefore the bypass technology of decoupling capacitor is adopted can not to solve the SSN problem of high frequency, result shows that decoupling capacitor only can be isolated noise at low frequency place, lost efficacy at high frequency treatment, although decoupling capacitor can effectively reduce plane impedance in low-frequency range, but the noise isolation wall be made up of electric capacity can cause noise waves to shake to the device in protection zone, thus cause potential EMI problem, in addition the number of devices that decoupling capacitor will compressor circuit plate can be put is laid in a large number, reduce availability, and add cost,
And for example the people such as P.Muthana is studied adding the suppression situation of embedded decoupling capacitor to simultaneous switching noise between power plane and ground level in the journal article of " ImprovementsinnoisesuppressionforI/Ocircuitsusingembedde dplanarcapacitors ", result shows that embedded decoupling capacitor has good synchro switch inhibition, but stopband covering wide band is limited, especially at low frequency place, and need special processing be carried out at dielectric layer or additionally add metal level, need higher manufacturing process, cost is higher, increase manufacture difficulty, reduce the effective usable floor area of power plane, reduce number of devices of putting placed on it, be unfavorable for actual Project Realization, reduce its validity, have a strong impact on causing the signal integrity of the transmission line being reference planes with it,
The people such as Zhang Bin reduce in simultaneous switching noise plane segmentation and have carried out action oriented research in the journal article being entitled as " electrical network high-speed data acquistion system plate level simultaneous switching noise suppresses research ", although decrease interplanar noise transfer, but concerning with plane be reference holding wire, such plane is not continuous reference planes, signal return path can be increased, thus signal quality is impacted, also can there is radiation time serious;
Both at home and abroad carry out large quantity research to the application of periodic electromagnetism bandgap structure in power distribution network and principle to explore with early stage, produce the multiple suppression degree of depth high, the periodic electromagnetism bandgap structure that stopband is wide, but the rejection ability of electromagnetic bandgap structure affects by unit number, need the multiple electromagnetic bandgap structure of cascade, actual components and parts are effectively put area and will be subject to the compression of electromagnetic bandgap structure position and area, be unfavorable for the design of large-scale complex circuit, and the signal return flow path that is reference planes with it will be destroyed due to periodic electromagnetism bandgap structure, reduce signal integrity, increase amount of radiation, need higher manufacturing process, cost is higher, actual engineer applied is limited in scope.
Summary of the invention
The object of the invention is the weak point existed for above-mentioned prior art, there is provided that a kind of structure is simple, omni-directional good, stopband is wide, Project Realization is strong, do not need to slot to power plane, without the need to periodic electromagnetism bandgap structure, to simultaneous switching noise suppress the degree of depth high, stopband is wide, based on local resonance isolation spiral resonant ring ultra broadband simultaneous switching noise suppress power distribution network.To solve existing noise suppression arrangement noise suppressed bandwidth deficiency, complex structure, cost is high, Project Realization is weak problem, keep good signal integrity simultaneously.
The technical solution adopted in the present invention is: a kind of spiral resonant ring ultra broadband simultaneous switching noise suppresses power distribution network, comprise power plane distributed architecture, ground level 4, be etched in the local isolation structure 9 of power plane, the dielectric layer 3 between power plane and ground level 4, it is characterized in that, power distribution network adopts at least 2 layers of PCB structure, noise source input circuit 1 and noise-sensitive circuit 2 are distributed in PCB structure power plane, and local isolation structure 9 lays respectively at the structural noise source input circuit of power plane and noise-sensitive circuit region; Described local isolation structure 9 is etched with the spiral resonant ring that utilization is carried out with layer power plane connecting, spiral resonant ring is etched in power plane according to described power plane distributed architecture, the simultaneous switching noise between insulating power supply and ground level 4; Local isolation structure 9 utilizes spiral resonant ring own resonance effect, in conjunction with power plane and the coupled resonance between ground level 4 metal level and dielectric layer, in noise frequency band, form stopband, block the propagation path of simultaneous switching noise, suppress surface wave, simultaneous switching noise is suppressed.
Preferably, power distribution network adopts 2 layers of PCB structure, dielectric layer is between power plane and ground level 4, medium substrate material is FR-4, relative dielectric constant is 3.8-4.4, loss angle tangent is 0-0.02, and dielectric thickness is 0.2-0.4 millimeter, and power distribution network metal thickness is 10-30 micron;
Preferably, power distribution network, when suppressing for standard for simultaneous switching noise with-45dB, can suppress simultaneous switching noise within the scope of 0.13-20GHz;
Preferably, local isolation structure 9 utilizes spiral resonant ring own resonance effect, in conjunction with the coupled resonance between metal level and dielectric layer, stopband is formed in band frequency band, block the propagation path of simultaneous switching noise, suppress surface wave, simultaneous switching noise is suppressed;
Preferably, spiral resonant ring is made up of square-shaped metal plane, square-shaped metal framework and wire spiral, and wherein, square-shaped metal plane is nested in square-shaped metal framework, and square-shaped metal plane is connected with square-shaped metal framework by wire spiral;
Preferably, local isolation structure 9 lays respectively at the structural noise source input circuit of power plane and noise-sensitive circuit region;
Preferably, local isolation structure 9 is a kind of microwave synthetic materials, and its structure has asymmetric feature, works as periodic arrangement, when electric field axially incides resonator surface, can produce negative permittivity, form darker rejection band depth and suppressing bandwidth;
The present invention has following beneficial effect compared to prior art:
The present invention is directed to Power Integrity in existing electronic circuit system and other suppresses that construct noise suppressing bandwidth is not enough, noise suppressed omni-directional is poor, technique and complex structure, Project Realization are weak problem, adopt 2 layers of PCB structure, utilize local resonance principle to design a kind of spiral resonant ring ultra broadband simultaneous switching noise based on the isolation of local resonance and suppress power distribution network, its advantage applies is:
Structure is simple, omni-directional good.The present invention adopts 2 layers of PCB structure, and structure is simple, and omni-directional is good, can carry out the suppression of ultra broadband simultaneous switching noise, reduce technique and structure complexity, improve the practicality of extensive engineer applied without the need to periodic electromagnetism bandgap structure.
Substantially the integrality of power plane is maintained.The present invention adopts the ground level 4 of unslotted, maintains the integrality of ground level completely, has higher signal integrity to the high speed signal that it is placed; Because ground level 4 keeps complete, thus maintain the signal integrity of high speed signal, and do not need periodic structure, more save circuit board space, technique is simple, and compared with other suppression structure, lower lower limiting frequency is possessed under same size, and keep high signal integrity, when without the simultaneous switching noise that can suppress hundred hertz of frequency ranges in power distribution network when decoupling capacitor, save component number.
Local isolation structure 9 is laid respectively at the structural noise source input circuit of power plane and noise-sensitive circuit region by the present invention; Without the need to slotting, add embedded power device or put the overall situation to power plane, local decoupling capacitances can reach the high suppression degree of depth to simultaneous switching noise in ultra wide band range, reduce the usage quantity to components and parts, reduce traditional circuit-board cost of manufacture, compared with other noise suppressing method, simplify the structure and technological process, reduce Project Realization difficulty.
Stopband is wide, Project Realization is strong.Local isolation structure 9 of the present invention utilizes spiral resonant ring own resonance effect, in conjunction with the coupled resonance between metal level and dielectric layer, in band frequency band, form stopband, block the propagation path of simultaneous switching noise, suppress surface wave, simultaneous switching noise is suppressed; Have structure simply, do not need to power plane fluting, add embedded power device or put the overall situation, local decoupling capacitances can ultra wideband frequency be issued to high simultaneous switching noise suppress the degree of depth, and have the advantages that omni-directional is good, Project Realization is strong, compared with other suppression structure, lower lower limiting frequency is possessed under same size, and keep high signal integrity, when without the simultaneous switching noise that can suppress hundred hertz of frequency ranges in power distribution network when decoupling capacitor.
Without the need to periodic electromagnetism bandgap structure, suppress the degree of depth high to simultaneous switching noise.The present invention etches the spiral resonant ring that utilization is carried out with layer power plane connecting on local isolation structure 9, and spiral resonant ring is etched in power plane according to described power plane distributed architecture, the simultaneous switching noise between insulating power supply and ground level; Local isolation structure 9 utilizes spiral resonant ring own resonance effect, in conjunction with power plane and the coupled resonance between ground plane metallic layer and dielectric layer, in noise frequency band, form stopband, block the propagation path of simultaneous switching noise, suppress surface wave, simultaneous switching noise is suppressed.Spiral resonant ring bridge is incorporated into connect the plane of segmentation in power plane/ground plane metallic layer structure, while raising simultaneous switching noise rejection ability, ensure that signal integrity performance well.Apply high relative dielectric constant medium in vertical cascade dielectric layer structure between power plane with ground level, not only widened switching noise and suppressed band gap, and improve the ability of electromagnetic bandgap structure low-frequency noise suppression.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 is the structural representation that spiral resonant ring ultra broadband simultaneous switching noise of the present invention suppresses power distribution network.
Fig. 2 is the vertical view of local isolation structure 9 in Fig. 1.
Fig. 3 is power distribution network according to the present invention each port noise suppressed scattering coefficient Comparative result figure.
Fig. 4 is that power distribution network of the present invention and complete reference plane noise suppress scattering coefficient Comparative result figure.
In figure: 1 noise source input circuit, 2 noise-sensitive circuit, 3 dielectric layers, 4 ground levels.5 square-shaped metal planes, 6 square-shaped metal frameworks, 7 wire spirals, 8 power plane, 9 local isolation structures.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art and understand the present invention further, but not limit the present invention in any form.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, some distortion and improvement can also be made.These all belong to protection scope of the present invention.Below in conjunction with accompanying drawing, the present invention is further described.
Consult Fig. 1.In embodiment described below, spiral resonant ring ultra broadband simultaneous switching noise suppresses power distribution network, mainly comprises power plane distributed architecture, is etched in the local isolation structure 9 of power plane, dielectric layer between power plane and ground level 4.This power distribution network is made up of power plane distributed architecture, the local isolation structure 9 being etched in power plane, ground level 4, dielectric layer; Wherein, ground level 4 keeps complete, power distribution network adopts at least 2 layers of PCB structure, power distribution network adopts 2 layers of PCB structure, and dielectric layer is between power plane and ground level 4, and medium substrate material is FR-4, relative dielectric constant is 4.4, loss angle tangent is 0.02, and dielectric thickness is 0.4 millimeter, and power distribution network metal thickness is 30 microns.Noise source input circuit 1 and noise-sensitive circuit 2 are distributed on the diagonal angle of PCB structure power plane.Power plane is distributed with the port PO RT1, port PO RT2, port PO RT3 and the port PO RT4 that represent noise source input circuit position, wherein, PORT3, PORT4 represent respectively and are positioned at the noise-sensitive circuit of power plane diverse location without isolation, and port PO RT2 representative is through the noise-sensitive circuit of local isolation.Local isolation structure 9 lays respectively at the structural noise source input circuit of power plane and noise-sensitive circuit region; Described local isolation structure 9 is etched with the spiral resonant ring that utilization is carried out with layer power plane connecting.The elementary cell of local isolation structure 9 is made up of spiral resonant ring.And spiral resonant ring center is shaped with for measurement noises carry-over factor, is connected power supply connecting hole with SMA coaxial connector with vector network analyzer.The power plane of same layer is utilized to connect between isolation structure.Spiral resonant ring is etched in power plane according to described power plane distributed architecture, the simultaneous switching noise between insulating power supply and ground level 4; Local isolation structure 9 utilizes spiral resonant ring own resonance effect, in conjunction with power plane and the coupled resonance between ground level 4 metal level and dielectric layer, in band frequency band, form stopband, block the propagation path of simultaneous switching noise, suppress surface wave, simultaneous switching noise is suppressed.
Described local isolation structure 9 is a kind of microwave synthetic materials, and its structure has asymmetric feature, works as periodic arrangement, when electric field axially incides resonator surface, can produce negative permittivity, form darker rejection band depth and suppressing bandwidth.
Consult Fig. 2.Local isolation structure 9 is made up of with the wire spiral 7 be etched in rectangular metal plane 5 rectangular metal plane 5, rectangular metal frame 6, wherein, rectangular metal framework 6 and rectangular metal plane 5 preferred forms are square-shaped metal framework and square-shaped metal plane respectively.Square-shaped metal plane is nested in square-shaped metal framework, and square-shaped metal plane is connected with square-shaped metal framework by wire spiral 7.Between square-shaped metal framework length of side a, square-shaped metal plane side length b, square-shaped metal frame width g1, wire spiral outside interval width g2, square metal frame inner edge g3 and metal flat between spacing, wherein a gets 30 millimeters, b gets 24 millimeters, g1 gets 1 millimeter, g2 gets 0.4 millimeter, g3 gets 2mm, and in the present embodiment, the metal spiral number of wire turns of spiral resonant ring is 5 circles.For reducing the lower limiting frequency suppressed simultaneous switching noise further, expanding stopband range, the increase of inductance and resonance structure inductance over the ground can be realized by increasing metal spiral number of wire turns.
Consult Fig. 3.In power distribution network each port noise suppressed scattering coefficient Comparative result figure, S21, S31, S41 represents port PO RT2 and port PO RT3 respectively, noise insulation factor between port PO RT4 and port PO RT1, as can be seen from Figure, two positions through local isolation, namely the stopband range of the noise insulation factor S21 noise suppressed scattering parameter of port PO RT2 is in 0.13-20GHz frequency range, the noise suppressed degree of depth reaches-45dB, be in 0.13-20GHz frequency range without the noise suppressed scattering parameter between the position of isolation and port PO RT1 in stopband range, the noise suppressed degree of depth reaches basic-40dB, show that a kind of spiral resonant ring ultra broadband simultaneous switching noise based on the isolation of local resonance that the present invention proposes suppresses power distribution network to have good ultra broadband simultaneous switching noise inhibition, and in multiple noise transmission direction, there is good rejection ability, have the advantages that noise suppressed omni-directional is good.
Consult Fig. 4.Suppress in scattering coefficient Comparative result figure in power distribution network and complete reference plane noise, can find out, a kind of spiral resonant ring ultra broadband simultaneous switching noise based on the isolation of local resonance that the present invention proposes suppresses power distribution network compared with complete power plane, has the simultaneous switching noise rejection ability at 0.13-20GHz frequency range Nei Da-45dB.To sum up, visible the present invention significantly has good rejection ability to simultaneous switching noise in power distribution network, and without the need to periodic electromagnetism bandgap structure, structure is simple, and work simplification, reduces the destruction to power plane, and maintain the complete of ground level 4, reduce the destruction to signal integrity.
Obviously, those skilled in the art can suppress the design of power distribution network to carry out various change and distortion to a kind of spiral resonant ring ultra broadband simultaneous switching noise based on the isolation of local resonance of the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments and distortion belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these changes and distortion.
Claims (10)
1. a spiral resonant ring ultra broadband simultaneous switching noise suppresses power distribution network, comprise power plane distributed architecture, ground level (4), be etched in the local isolation structure (9) of power plane, be positioned at the dielectric layer (3) between power plane and ground level (4), it is characterized in that, power distribution network adopts at least 2 layers of PCB structure, noise source input circuit (1) and noise-sensitive circuit (2) are distributed on the diagonal angle of PCB structure power plane, local isolation structure (9) lays respectively at the structural noise source input circuit of power plane and noise-sensitive circuit region, described local isolation structure (9) is etched with the spiral resonant ring that utilization is carried out with layer power plane connecting, spiral resonant ring is etched in power plane according to described power plane distributed architecture, the simultaneous switching noise between insulating power supply and ground level, local isolation structure (9) utilizes spiral resonant ring own resonance effect, in conjunction with power plane (8) and the coupled resonance between ground plane metallic layer and dielectric layer, stopband is formed in band frequency band, block the propagation path of simultaneous switching noise, suppress surface wave, simultaneous switching noise is suppressed.
2. spiral resonant ring ultra broadband simultaneous switching noise according to claim 1 suppresses power distribution network, it is characterized in that: power distribution network adopts 2 layers of PCB structure, dielectric layer is between power plane and ground level 4, medium substrate material is FR-4, relative dielectric constant is 3.8-4.4, loss angle tangent is 0-0.02, and dielectric thickness is 0.2-0.4 millimeter, and power distribution network metal thickness is 10-30 micron.
3. spiral resonant ring ultra broadband simultaneous switching noise according to claim 1 suppresses power distribution network, it is characterized in that: power plane is distributed with the port PO RT1, port PO RT2, port PO RT3 and the port PO RT4 that represent noise source input circuit position, wherein, PORT3 represents respectively and is positioned at the noise-sensitive circuit of power plane diverse location without isolation, and port PO RT4 representative is through the noise-sensitive circuit of local isolation.
4. spiral resonant ring ultra broadband simultaneous switching noise suppresses power distribution network according to claim 1, it is characterized in that: described local isolation structure 9 is a kind of microwave synthetic materials, its structure has asymmetric feature, work as periodic arrangement, when electric field axially incides resonator surface, can negative permittivity be produced, form darker rejection band depth and suppressing bandwidth.
5. spiral resonant ring ultra broadband simultaneous switching noise suppresses power distribution network according to claim 1, it is characterized in that: the elementary cell of local isolation structure 9 is made up of spiral resonant ring.
6. spiral resonant ring ultra broadband simultaneous switching noise suppresses power distribution network according to claim 1, it is characterized in that: spiral resonant ring center is shaped with for measurement noises carry-over factor, is connected power supply connecting hole with SMA coaxial connector with vector network analyzer.
7. spiral resonant ring ultra broadband simultaneous switching noise suppresses power distribution network according to claim 1, it is characterized in that: local isolation structure (9) is made up of rectangular metal plane (5), rectangular metal frame (6) and the wire spiral (7) be etched in rectangular metal plane (5), wherein, rectangular metal framework (6) and rectangular metal plane (5) are square-shaped metal framework and square-shaped metal plane respectively.
8. spiral resonant ring ultra broadband simultaneous switching noise suppresses power distribution network according to claim 7, it is characterized in that: square-shaped metal plane is nested in square-shaped metal framework, square-shaped metal plane is connected with square-shaped metal framework by wire spiral 7.
9. spiral resonant ring ultra broadband simultaneous switching noise suppresses power distribution network according to claim 1, it is characterized in that: the metal spiral number of wire turns of spiral resonant ring is 3-5 circle, for reducing the lower limiting frequency suppressed simultaneous switching noise further, expanding stopband range, realizing the increase of inductance and resonance structure inductance over the ground by increasing metal spiral number of wire turns.
10. spiral resonant ring ultra broadband simultaneous switching noise suppresses power distribution network according to claim 1, it is characterized in that: when with-45dB for noise suppressed depth standards time, the suppression stopband range of the noise suppressed scattering parameter S21 between port PO RT1 and port PO RT2 is 0.13-20GHz frequency range, when with-40dB for noise suppressed depth standards time, without isolation position and port PO RT1 between suppression stopband range be 0.13-20GHz frequency range.
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