CN106954334B - Signal transmission circuit - Google Patents
Signal transmission circuit Download PDFInfo
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- CN106954334B CN106954334B CN201710027892.8A CN201710027892A CN106954334B CN 106954334 B CN106954334 B CN 106954334B CN 201710027892 A CN201710027892 A CN 201710027892A CN 106954334 B CN106954334 B CN 106954334B
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- signal transmission
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0237—High frequency adaptations
- H05K1/0245—Lay-out of balanced signal pairs, e.g. differential lines or twisted lines
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/09218—Conductive traces
- H05K2201/09245—Crossing layout
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/09654—Shape and layout details of conductors covering at least two types of conductors provided for in H05K2201/09218 - H05K2201/095
- H05K2201/09672—Superposed layout, i.e. in different planes
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The present invention is about a kind of signal transmission circuit, it includes that a connection unit includes a first connecting portion and a second connecting portion, the both ends of first connecting portion are separately connected one first impedance component and one second impedance component, and one end of second connecting portion connects first connecting portion and the other end is a ground terminal；One first signal transmission unit includes one first metallic conductor and one second metallic conductor, one second signal transmission unit includes a third metallic conductor and one the 4th metallic conductor, first metallic conductor and the second metallic conductor are via a fifth metal conductor the first impedance component of connection, third metallic conductor and the 4th metallic conductor are via one the 6th metallic conductor the second impedance component of connection, whereby, the problem of signal transmission circuit proposed by the invention will effectively inhibit common-mode noise, reduce electromagnetic interference.
Description
Technical field
The present invention is about a kind of signal transmission circuit, espespecially a kind of signal transmission circuit to transmit differential-mode signal.
Background technique
With the fast development of science and technology, the service speed and frequency of digital circuit are higher and higher, so that differential mode transmission
It is widely used in high-speed digital signals transmission.Differential mode transmission line circuit has high antinoise, low electromagnetic and low string
The characteristic that audio is answered plays the part of important role in digital signal transmission.However, in the application of practical high speed circuit, differential mode
Transmission line circuit often will appear some nonideal circuit structures, such as: asymmetry wiring, signal cabling turning,
The presence of grooved bore.Nonideal circuit structure will make the differential-mode signal of part be to be converted into common mode signal, so that producing
The problem of raw electromagnetic interference.
In the past in order to solve the problems, such as electromagnetic interference, the mode of most-often used ferrimagnet is inhibited, and is utilized
The high inductance characteristic of electromagnetic material inhibits electromagnetic interference raw, but, this mode can only operate in low-frequency range, and structure is too very much not
Easily apply on high-speed digital circuit.
In view of this, the present invention will provide a kind of signal transmission circuit of innovation, signal transmission circuit can be effectively
Inhibit electromagnetic interference, to promote differential-mode signal transmission quality in communication system, it will be the purpose of the present invention.
Summary of the invention
A purpose of the invention is to propose that a kind of signal transmission circuit, circuit include a connection unit, one first news
Number transmission unit and one second signal transmission unit, the horizontal two sides of connection unit pass through respectively a connection metallic conductor and
One impedance component and connect the first signal transmission unit and the second signal transmission unit, here, signal transmission circuit of the present invention
The electromagnetic interference that framework is caused effective inhibition common-mode noise.
A purpose of the invention is to propose a kind of signal transmission circuit, the first signal transmission unit and the second signal
The metallic conductor of transmission unit can be designed as a strip, a spiral shape or a snakelike shape.
A purpose of the invention is to propose a kind of signal transmission circuit, the first signal transmission unit and the second signal
Transmission unit is further connected with one or more groups of additional metallic conductors, so that signal transmission circuit shape under multiple specific frequencies
At multiple corresponding transmission zeros, to inhibit the common-mode noise of multiple special frequency bands.
A purpose of the invention, is to propose a kind of signal transmission circuit, circuit framework by with the metal layer of multilayer into
Row is realized.
To reach above-mentioned purpose, the present invention provides a kind of signal transmission circuit, comprising: a connection unit includes one
One interconnecting piece and a second connecting portion, the both ends of first connecting portion are separately connected one first impedance component and one second impedance group
One end of part, second connecting portion connects first connecting portion and the other end is a ground terminal；One first signal transmission unit, including one
One end of first metallic conductor and one second metallic conductor, the first metallic conductor is one first signal input end, and the second metal is led
One end of body is one first signal output end；And one second signal transmission unit, including a third metallic conductor and one the 4th gold medal
Belong to conductor, one end of third metallic conductor is one second signal input end, and one end of the 4th metallic conductor is that one second signal is defeated
Outlet, wherein the other end of the other end of the first metallic conductor and the second metallic conductor is separately connected a fifth metal conductor and warp
First impedance component is connected by fifth metal conductor, and the other end of the other end of third metallic conductor and the 4th metallic conductor divides
Not Lian Jie one the 6th metallic conductor and via the 6th metallic conductor connect the second impedance component.
In one embodiment of the invention, wherein the first impedance component and the second impedance component have respectively included an at least capacitive character
Component.
In one embodiment of the invention, wherein capacitive component be a circumscribed capacitor or one be produced on it is interior on a circuit board
Embedded capacitor.
In one embodiment of the invention, wherein the first metallic conductor, the second metallic conductor, third metallic conductor, the 4th metal
Conductor, fifth metal conductor, the 6th metallic conductor, the first impedance component and the second impedance component are base centered on connection unit
Standard is symmetricly set on the two sides of connection unit.
In one embodiment of the invention, wherein the first metallic conductor, the second metallic conductor, third metallic conductor and the 4th metal
Conductor is respectively the metallic conductor of a snakelike shape.
In one embodiment of the invention, wherein the first metallic conductor, the second metallic conductor, third metallic conductor and the 4th metal
Conductor is respectively a spiral helicine metallic conductor.
It further include having one first additional metal conductor, one second additional metal conductor, a third in one embodiment of the invention
Additional metal conductor and one the 4th additional metal conductor, one end of the first additional metal conductor are connected to the one of the first metallic conductor
Side, one end of the second additional metal conductor are connected to the side of the second metallic conductor, one end connection of third additional metal conductor
To the side of third metallic conductor, one end of the 4th additional metal conductor is connected to the side of the 4th metallic conductor, wherein first
The other end of additional metal conductor and the other end of the second additional metal conductor are close to each other, and third additional metal conductor is another
One end and the other end of the 4th additional metal conductor are close to each other.
In one embodiment of the invention, wherein the other end of the other end of the first metallic conductor and the second metallic conductor passes through respectively
Fifth metal conductor, and the other end of the other end of third metallic conductor and the 4th metallic conductor are connected by one first conductive through hole
The 6th metallic conductor is connected via one second conductive through hole respectively.
In one embodiment of the invention, wherein the first metallic conductor includes one first line segment and a second line segment, the second gold medal
Belonging to conductor includes a third line segment and one the 4th line segment, and third metallic conductor includes one the 5th line segment and one the 6th line segment,
4th metallic conductor includes one the 7th line segment and one the 8th line segment；Second line segment one end connection fifth metal conductor and it is another
End connects one end of the first line segment via one first conductive through hole, and the other end of the first line segment is the first signal input end；4th
Line segment one end connection fifth metal conductor and the other end via one second conductive through hole connection third line segment one end, third line
The other end of section is the first signal output end；One end of 6th line segment connects the 6th metallic conductor and the other end is led via a third
Electric perforation connects one end of the 5th line segment, and the other end of the 5th line segment is the second signal input end；One end of 8th line segment connects
6th metallic conductor and the other end connect one end of the 7th line segment via one the 4th conductive through hole, and the other end of the 7th line segment is the
Two signal output ends.
In one embodiment of the invention, wherein the 4th line segment of the second line segment of the first metallic conductor, the second metallic conductor,
6th line segment of three metallic conductors and the 8th line segment of the 4th metallic conductor are respectively the metal wire of a spiral shape or a snakelike shape
Section.
Detailed description of the invention
Fig. 1 is the construction perspective view of the signal transmission circuit of one embodiment of the invention；
Fig. 2 is the construction perspective view of the signal transmission circuit of further embodiment of this invention；
Fig. 3 is the construction perspective view of the signal transmission circuit of further embodiment of this invention；
Fig. 4 is the construction perspective view of the signal transmission circuit of further embodiment of this invention；
Fig. 5 is the construction perspective view of the signal transmission circuit of further embodiment of this invention；
Fig. 6 is the construction perspective view of the signal transmission circuit of further embodiment of this invention；
Fig. 7 is the construction perspective view of the signal transmission circuit of further embodiment of this invention；
Fig. 8 is that the present invention executes differential mode for the signal transmission circuit of Fig. 1 and common mode measures the waveform diagram of an embodiment；
Fig. 9 is that the present invention executes differential mode for the signal transmission circuit of Fig. 1 and common mode measures the waveform diagram of another embodiment；
Figure 10 is that the present invention executes differential mode for the signal transmission circuit of Fig. 1 and common mode measures the waveform of another embodiment
Figure；
Figure 11 is that the present invention executes differential mode for the signal transmission circuit of Fig. 6 and common mode measures the waveform diagram of an embodiment；
Figure 12 is that the present invention executes differential mode for the signal transmission circuit of Fig. 4 and common mode measures the waveform diagram of an embodiment；
Figure 13 is that the present invention executes differential mode for the signal transmission circuit of Fig. 4 and common mode measures the waveform of another embodiment
Figure；
Figure 14 is that the present invention executes differential mode for the signal transmission circuit of Fig. 4 and common mode measures the waveform of another embodiment
Figure.
Primary clustering symbol description:
100 signal transmission circuits；10 connection units；
11 first connecting portions；12 second connecting portions；
13 ground terminals；201 first signal transmission units；
202 second signal transmission units；21 first metallic conductors；
210 first signal input ends；211 first line segments；
212 second line segments；22 second metallic conductors；
220 first signal output ends；221 third line segments；
222 the 4th line segments；23 third metallic conductors；
230 second signal input ends；231 the 5th line segments；
232 the 6th line segments；24 the 4th metallic conductors；
240 second signal output ends；241 the 7th line segments；
242 the 8th line segments；25 fifth metal conductors；
26 the 6th metallic conductors；31 first impedance components；
32 second impedance components；41 first additional metal conductors；
42 second additional metal conductors；43 third additional metal conductors；
44 the 4th additional metal conductors；51 first conductive through holes；
52 second conductive through holes；61 first conductive through holes；
62 second conductive through holes；63 third conductive through holes；
64 the 4th conductive through holes；901 differential mode penetrating coefficient curves；
902 common mode penetrating coefficient curves；903 differential mode penetrating coefficient curves；
904 common mode penetrating coefficient curves；905 differential mode penetrating coefficient curves；
906 common mode penetrating coefficient curves；907 differential mode penetrating coefficient curves；
908 common mode penetrating coefficient curves；909 differential mode penetrating coefficient curves；
910 common mode penetrating coefficient curves；911 differential mode penetrating coefficient curves；
912 common mode penetrating coefficient curves；913 differential mode penetrating coefficient curves；
914 common mode penetrating coefficient curves.
Specific embodiment
Referring to Fig. 1, the construction perspective view of the signal transmission circuit for one embodiment of the invention.As shown in Figure 1, of the invention
The signal transmission circuit 100 of one embodiment is applied in the differential-mode signal transmission of a communication system comprising a connection unit
10, one first signal transmission unit 201 and one second signal transmission unit 202, the first signal transmission unit 201 and one second news
Group is become a pair of of differential-mode signal cable architecture by number transmission unit 202.Connection unit 10, the first signal transmission unit 201 and second
Signal transmission unit 202 can be produced on a circuit board by the way of layout.
Wherein, connection unit 10 includes a first connecting portion 11 and a second connecting portion 12.In one embodiment of the invention, even
Order member 10 is a T-type metallic conductor, and the long side of first connecting portion 11 will be greater than the short side of second connecting portion 12.Alternatively, connection
Unit 10 is an elongated metal conductor, and the long side of first connecting portion 11 will be equal to the short side of second connecting portion 12.First connection
The both ends in portion 11 are separately connected one first impedance component 31 and one second impedance component 32, and one end of second connecting portion 12 connects
First connecting portion 11 and the other end are a ground terminal 13.
First signal transmission unit 201 includes one first metallic conductor 21 and one second metallic conductor 22.First metal is led
One end of body 21 is one first signal input end 210, and one end of the second metallic conductor 22 is one first signal output end 220.The
The other end of the other end of one metallic conductor 21 and the second metallic conductor 22 is separately connected a fifth metal conductor 25 and via
Five metallic conductors 25 are connected to the first impedance component 31.Second signal transmission unit 202 includes a third metallic conductor 23 and one
4th metallic conductor 24.One end of third metallic conductor 23 is one second signal input end 230, one end of the 4th metallic conductor 24
For one second signal output end 240.The other end of the other end of third metallic conductor 23 and the 4th metallic conductor 24 is separately connected
One the 6th metallic conductor 26 and via the 6th metallic conductor 26 connect the second impedance component 32.One differential-mode signal will be from the first news
First signal input end 210 of number transmission unit 201 and the second signal input end 230 of the second signal transmission unit 202 enter
Signal transmission circuit 100, with from the first signal output end 220 and the second signal transmission unit of the first signal transmission unit 201
202 the second signal output end 240 output.When differential-mode signal enters signal transmission circuit 100, signal transmission circuit 100 will
The effect of inhibiting common-mode noise can be generated.
First impedance component 31 and the second impedance component 32 have respectively included an at least capacitive component.It is real in the present invention one
It applies in example, capacitive component can be the embedded capacitor of a production on circuit boards.Alternatively, in further embodiment of this invention
In, capacitive component can be a replaceable circumscribed capacitor.Here, the first impedance component 31 of the invention and the second impedance group
The capacitive component of part 32 is the capacitive component of a circumscribed, can select electricity according to the rejection band in common-mode noise
Capacitance.
Of the invention first metallic conductor 21, the second metallic conductor 22, third metallic conductor 23, the 4th metallic conductor 24, the
Five metallic conductors 25, the 6th metallic conductor 26, the first impedance component 31 and the second impedance component 32 are centered on connection unit 10
On the basis of be symmetricly set on the two sides of connection unit 10.Here, signal transmission circuit 100 of the present invention is set using the construction of symmetry
Meter when differential-mode signal being avoided to enter signal transmission circuit 100, is converted to the differential-mode signal of part due to nonideal construction
Common-mode noise.
First metallic conductor 21 of signal transmission circuit 100 of the present invention, the second metallic conductor 22, third metallic conductor 23 and
4th metallic conductor 24 can also be respectively designed to the metal of a snakelike shape in addition to the metallic conductor that can be designed to a strip
Conductor, as shown in Fig. 2；Alternatively, the first metallic conductor 21 of signal transmission circuit 100 of the present invention, the second metallic conductor 22,
Three metallic conductors 23 and the 4th metallic conductor 24 can also be respectively designed to a spiral helicine metallic conductor, as shown in Fig. 3.This
Invention signal transmission circuit 100 is further by the first metallic conductor 21, the second metallic conductor 22, third metallic conductor 23 and the 4th
Metallic conductor 24 is designed to that snakelike shape or spiral helicine metallic conductor will can increase the effect of electromagnetic coupling, to further suppress
The common-mode noise of broader frequency band.
Referring to Fig. 4, the construction perspective view of the signal transmission circuit for further embodiment of this invention.As shown in figure 4, this reality
Applying a signal transmission circuit 100 further includes having one first additional metal conductor 41, one second additional metal conductor 42, a third attached
Add metallic conductor 43 and one the 4th additional metal conductor 44.First additional metal conductor 41, the second additional metal conductor 42, third
Additional metal conductor 43 and the 4th additional metal conductor 44 are respectively the metallic conductor of a bending.First additional metal conductor 41
One end is connected to the side of the first metallic conductor 21, and one end of the second additional metal conductor 42 is connected to the second metallic conductor 22
One end 43 of side, third additional metal conductor is connected to the side of third metallic conductor 23, the 4th additional metal conductor 44
One end is connected to the side of the 4th metallic conductor 24.The other end of first additional metal conductor 41 and the second additional metal conductor 42
The other end will be close to each other, and the other end of the other end of third additional metal conductor 43 and the 4th additional metal conductor 44
It will be close to each other.In other words, the first additional metal conductor 41 of part and the second partial additional metal conductor 42 will phases
It is mutually close, and partial third additional metal conductor 43 and the 4th partial additional metal conductor 44 will be close to each other.By
Additional metal conductor 41,42,43,43 is added, and signal transmission circuit 100 can be made to be formed under multiple specific frequencies pair
The transmission zero answered, to inhibit the common-mode noise of multiple special frequency bands.
Referring to Fig. 5, the construction perspective view of the signal transmission circuit for further embodiment of this invention.Above-described embodiment be with
Single metal layer produces signal transmission circuit 100 of the present invention, as shown in Figs 1-4, alternatively, signal transmission circuit of the present invention 100
It can be made with more metal layers (such as three-layer metal layer), as shown in Figure 5.
As shown in Fig. 5, connection unit 10 of the present invention, the first metallic conductor 21, the second metallic conductor 22, third metal are led
Body 23, the 4th metallic conductor 24, fifth metal conductor 25 and the 6th metallic conductor 26 will be formed in three layers of metal layer.Connection
Unit 10, fifth metal conductor 25 and the 6th metallic conductor 26 are arranged in the metal layer of the top, and the first of connection unit 10
The side of interconnecting piece 11 is connected with the first impedance component 31 and fifth metal conductor 25 and the other side is connected with the second impedance component
32 and the 6th metallic conductor 26.First metallic conductor 21 and third metallic conductor 23 will be arranged in intermediate metal layer, and first
One end of metallic conductor 21 is that the first signal input end 210 and the other end via one first conductive through hole 51 are connected to fifth metal
Conductor 25, one end of third metallic conductor 23 is the second signal input end 230 and the other end connects via one second conductive through hole 52
It is connected to the 6th metallic conductor 26.Second metallic conductor 22 and the 4th metallic conductor 24 are arranged in the metal layer of bottom, and second
One end of metallic conductor 22 is the first signal output end 220 and the other end is connected to fifth metal via the first conductive through hole 51 and leads
Body 25, one end of the 4th metallic conductor 24 is the second signal output end 240 and the other end is connected to via the second conductive through hole 52
6th metallic conductor 26.
Furthermore in the present embodiment, the first metallic conductor 21 carries out in different directions respectively with the second metallic conductor 22
Setting.Alternatively, the first metallic conductor 21 and the second metallic conductor 22 are carried out with same direction in further embodiment of this invention
Setting, so that the first metallic conductor 21 can overlap up and down with the second metallic conductor 22.Alternatively, in further embodiment of this invention,
First metallic conductor 21 and the second metallic conductor 22 can be fabricated to the metal wire sections of a snakelike shape, and the first metallic conductor 21
Or second the metal wire sections of metallic conductor 22 can extend towards the second metallic conductor 22 or the first metallic conductor 21 and lay so that
The first partial metallic conductor 21 and the second metallic conductor 22 of part can overlap up and down.
Referring to Fig. 6, the construction perspective view of the signal transmission circuit for further embodiment of this invention.As shown in fig. 6, this reality
The first signal transmission unit 201 and the second signal transmission unit 202 will be made with more metal layers (such as two metal layers) by applying example.
In the first signal transmission unit 201, the first metallic conductor 21 includes one first line segment 211 and a second line segment
212, and the second metallic conductor 22 includes a third line segment 221 and one the 4th line segment 222.In the second signal transmission unit 202
In, third metallic conductor 23 includes one the 5th line segment 231 and one the 6th line segment 232, and the 4th metallic conductor 24 includes one
7th line segment 241 and one the 8th line segment 242.
Connection unit 10, fifth metal conductor 25, the 6th metallic conductor 26, second line segment 212, the 4th line segment the 222, the 6th
Line segment 232 and the 8th line segment 242 are arranged in the metal layer of the top, the two sides difference of the first connecting portion 11 of connection unit 10
Be connected with the first impedance component 31 and the second impedance component 32, one end of one end of second line segment 212 and the 4th line segment 222 via
Fifth metal conductor 25 connects the first impedance component 31, and one end of the 6th line segment 232 and one end of the 8th line segment 242 are via the
Six metallic conductors 26 connect the second impedance component 32.
The metal layer of bottom is arranged in first line segment 211, third line segment 221, the 5th line segment 231 and the 7th line segment 241
In, one end of the first line segment 211 is the first signal input end 210 and the other end passes through one first conductive through hole 61 the second line of connection
The other end of section 212, one end of third line segment 221 is the first signal output end 220 and the other end passes through one second conductive through hole
The other end of 62 the 4th line segments 222 of connection, one end of the 5th line segment 231 is the second signal input end 230 and the other end passes through one
Third conductive through hole 63 connects the other end of the 6th line segment 232, one end of the 7th line segment 241 be the second signal output end 240 and
The other end connects the other end of the 8th line segment 242 by one the 4th conductive through hole 64.
Referring to Fig. 7, the construction perspective view of the signal transmission circuit for further embodiment of this invention.It is real to connect above-mentioned Fig. 6
Apply example, the 6th of the second line segment 212 of the first signal transmission unit 201, the 4th line segment 222 and the second signal transmission unit 202 the
Line segment 232, the 8th line segment 242 can be designed to the metal wire sections of a strip；Alternatively, as shown in fig. 7, the transmission of the first signal is single
Member 201 second line segment 212, the 4th line segment 222 and the second signal transmission unit 202 the 6th line segment 232, the 8th line segment 242
It can be designed to the metal wire sections of a spiral shape or a snakelike shape.
Referring to Fig. 8, the waveform of differential mode and common mode one embodiment of measurement is executed for Fig. 1 signal transmission circuit for the present invention
Figure.As shown in figure 8, for differential-mode signal and the common-mode noise amount of progress when 100 practical application of signal transmission circuit of Fig. 1 embodiment
Survey will respectively obtain a differential mode penetrating coefficient curve 901 and a common mode penetrating coefficient curve 902.
For common-mode noise, generally using -10dB as the benchmark of the penetrating coefficient of common-mode noise, penetrating coefficient is low
Common-mode noise will be represented in -10dB or less to be effectively suppressed.By taking the present invention as an example, common mode penetrating coefficient curve 902 is in frequency
0.8GHz will generate a transmission zero, and in the frequency separation of 0.7GHz to 1GHz, its penetrating coefficient will be lower than -10dB or less.
Then, it is learnt via curve 901,902, the signal transmission circuit 100 of Fig. 1 embodiment is applied in low-frequency band (0.7GHz to 1GHz)
When, there is preferable inhibitory effect for common-mode noise.
Referring to Fig. 9, the wave of another embodiment is measured for Fig. 1 signal transmission circuit execution differential mode and common mode for the present invention
Shape figure.The capacitive component of first impedance component 31 and the second impedance component 32 of the invention is a circumscribed capacitor, as surface is glutinous
The voltage variation capacitance of formula (Surface-mountDevices, SMD) capacitor or circumscribed
(voltagecontrolcapacitance), capacitance can be selected according to the rejection band in common-mode noise.Such as Fig. 9
It is shown, before the capacitance of the capacitive component of the first impedance component 31 and the second impedance component 32 increases, measure signal transmission electricity
Road 100 will obtain differential mode penetrating coefficient curve 901 and common mode penetrating coefficient curve 902, and common mode penetrating coefficient curve 902 is in frequency
Rate 0.8GHz will generate a transmission zero, and in the frequency separation of 0.7GHz to 1GHz, its penetrating coefficient will be lower than -10dB or less.
After the capacitance of the capacitive component of the first impedance component 31 and the second impedance component 32 increases, signal transmission circuit is measured
100 will obtain a differential mode penetrating coefficient curve 903 and a common mode penetrating coefficient curve 904, common mode penetrating coefficient curve 904 exist
Frequency 0.6GHz will generate a transmission zero, and in the frequency separation of 0.5GHz to 0.8GHz, its penetrating coefficient will be lower than -10dB
Below.
It follows that first impedance component 31 of the invention and the capacitive component of the second impedance component 32 its capacitance increase
Afterwards, the cutoff frequency of transmission zero, the frequency band of inhibition common-mode noise and differential mode will be adjusted toward the direction of more low frequency.Certainly, originally
The capacitance for inventing the capacitive component of the first impedance component 31 and the second impedance component 32 can also downgrade (as capacitance is set in choosing
Lesser capacitive component), then, the cutoff frequency of transmission zero, the frequency band for inhibiting common-mode noise and differential mode will be toward higher-frequency
Direction adjustment.In this, the circumscribed capacitor of the first impedance component 31 and the second impedance component 32 of the invention can be according to design requirement
It freely selects fit value and is adjusted to determine the frequency band to be inhibited, other values can be selected to do optimization according to noise characteristic when practical application
It is whole or variation can be made according to circuit board other values is selected to correct the offset of effect caused by the variation.
Referring to Fig. 10, measuring another embodiment for Fig. 1 signal transmission circuit execution differential mode and common mode for the present invention
Waveform diagram.First signal transmission unit 201 can be further close to second by the circuit framework of signal transmission circuit 100 of the present invention
The position of signal transmission unit 202 is configured, and such as the first metallic conductor 21 is close to third metallic conductor 23 and/or the second metal
Conductor 22 is close to the 4th metallic conductor 24.
First signal transmission unit 201 is close to after the position of the second signal transmission unit 202 is configured, and can be changed
The kind rate of decay of the differential mode in high frequency such as the comparison of the differential mode penetrating coefficient curve 901,905 of Figure 10, and increases common mode inhibition
Frequency range, such as the comparison of the common mode penetrating coefficient curve 902,906 of Figure 10.
Figure 11 is please referred to, differential mode is executed for Fig. 6 signal transmission circuit for the present invention and common mode measures the wave of an embodiment
Shape figure.As shown in fig. 6, the present embodiment can make the first signal transmission unit 201 with more metal layers and the transmission of the second signal is single
Member 202, such as the first line segment 211, third line segment 221, the 5th line segment 231 and the 7th line segment 241 are produced on bottom metal layer,
Second line segment 212, the 4th line segment 222, the 6th line segment 232 and the 8th line segment 242, are produced on the metal layer of the top.Such as Figure 11
Shown, differential-mode signal and common-mode noise measure when 100 practical application of signal transmission circuit of Fig. 6 embodiment will be respectively
Obtain a differential mode penetrating coefficient curve 907 and a common mode penetrating coefficient curve 908.
First signal transmission unit 201 and the second signal transmission unit 202 are made with more metal layers, and via
The design of the appropriate location of first signal transmission unit 201 and the second signal transmission unit 202, such as the first partial signal pass
Defeated unit 201 and the second partial signal transmission unit 202 are arranged close to, and will can improve decaying speed of the differential mode in high frequency
Degree such as the comparison of the differential mode penetrating coefficient curve 901,907 of Figure 11, and increases the frequency range of common mode inhibition, such as being total to for Figure 11
The comparison of mould penetrating coefficient curve 902,908.
Figure 12 is please referred to, differential mode is executed for Fig. 4 signal transmission circuit for the present invention and common mode measures the wave of an embodiment
Shape figure.The signal transmission circuit 100 of Fig. 4 embodiment is in the first signal transmission unit 201 and the second signal transmission unit 202 into one
Step is connected with one or more groups of additional metallic conductors 41,42,43,44.100 practical application of signal transmission circuit of Fig. 4 embodiment
When differential-mode signal and common-mode noise are measured will respectively obtain a differential mode penetrating coefficient curve 909 and a common mode penetrates and is
Number curve 910, as shown in figure 12.
As shown in figure 12, common mode penetrating coefficient curve 909 frequency 0.8GHz have a first transmission zero Z1 and
Have an one second transmission zero Z2 in frequency 2.1GHz, and the frequency separation of 0.7GHz to 1GHz and 1.5GHz extremely
Its penetrating coefficient of the frequency separation of 2.6GHz will be lower than -10dB or less.Then, the signal transmission circuit 100 of Fig. 4 embodiment will
Multiple corresponding transmission zeros can be formed, under multiple specific frequencies to inhibit the common-mode noise of multiple special frequency bands.
Figure 13 is please referred to, differential mode is executed for Fig. 4 signal transmission circuit for the present invention and common mode measures another embodiment
Waveform diagram.The capacitive component of first impedance component 31 and the second impedance component 32 of the invention is the capacitive character group of a circumscribed
Part can select capacitance according to the rejection band in common-mode noise.As shown in figure 13, the first impedance component 31 and second
After the capacitance of the capacitive component of impedance component 32 downgrades, the frequency of first transmission zero Z1 and its corresponding common mode inhibition frequency
Band will be adjusted toward the direction of higher-frequency.As shown in common mode penetrating coefficient curve 912, the frequency of script first transmission zero Z1 from
0.8GHz is adjusted to 1GHz, common mode inhibition frequency band corresponding to script first transmission zero Z1 adjusted from 0.7GHz to 1GHz to
0.9GHz to 1.2GHz.Certainly, the capacitance of the capacitive component of the first impedance component 31 and the second impedance component 32 of the invention
It can also increase (as the biggish capacitive component of capacitance is set in choosing), then, and first transmission zero Z1 and first transmission zero Z1 institute
Corresponding common mode inhibition frequency band will be adjusted toward the direction compared with low frequency.
Figure 14 is please referred to, differential mode is executed for Fig. 4 signal transmission circuit for the present invention and common mode measures another embodiment
Waveform diagram.First signal transmission unit 201 can be further close to second by the circuit framework of signal transmission circuit 100 of the present invention
The position of signal transmission unit 202 is configured, and such as the first metallic conductor 21 is close to third metallic conductor 23 and/or the second metal
Conductor 22 is close to the 4th metallic conductor 24.
First signal transmission unit 201 is close to after the position of the second signal transmission unit 202 is configured, the second transmission
The frequency of zero point Z2 and its corresponding common mode inhibition frequency band will be adjusted toward the direction compared with low frequency.By common mode penetrating coefficient curve 914
Expression, the frequency of the second transmission zero Z2 is adjusted from 2.1GHz to 1.6GHz originally, originally corresponding to the second transmission zero Z2
Common mode inhibition frequency band adjusted from 1.5GHz to 2.6GHz to 1GHz to 2.1GHz.
As described above, a preferred embodiment only of the invention is not used to limit the scope of implementation of the present invention,
I.e. all equivalent changes and modifications carried out by according to shape, construction described in the claims in the present invention, feature and spirit, should all be included in
In claim of the invention.
Claims (10)
1. a kind of signal transmission circuit, which is characterized in that the signal transmission circuit includes:
One connection unit is metallic conductor, includes a first connecting portion and a second connecting portion, and the two of the first connecting portion
End is separately connected one first impedance component and one second impedance component, one end connection of the second connecting portion first connection
Portion and the other end are a ground terminal；
One first signal transmission unit, including one first metallic conductor and one second metallic conductor, first metallic conductor
One end is one first signal input end, and one end of second metallic conductor is one first signal output end；And
One second signal transmission unit, including a third metallic conductor and one the 4th metallic conductor, the third metallic conductor
One end is one second signal input end, and one end of the 4th metallic conductor is one second signal output end, wherein described first
The other end of the other end of metallic conductor and second metallic conductor is separately connected a fifth metal conductor and via described
Five metallic conductors connect first impedance component, and the other end of the third metallic conductor and the 4th metallic conductor
The other end is separately connected one the 6th metallic conductor and connects second impedance component via the 6th metallic conductor.
2. signal transmission circuit according to claim 1, which is characterized in that first impedance component and second resistance
Anti- component has respectively included an at least capacitive component.
3. signal transmission circuit according to claim 2, which is characterized in that the capacitive component is a circumscribed capacitor
Or one be produced on embedded capacitor on a circuit board.
4. signal transmission circuit according to claim 1, which is characterized in that first metallic conductor, second gold medal
Belong to conductor, the third metallic conductor, the 4th metallic conductor, the fifth metal conductor, the 6th metallic conductor, institute
State the first impedance component and second impedance component be symmetricly set on centered on the symmetrical centre of the connection unit it is described
The two sides of the symmetrical centre of connection unit.
5. signal transmission circuit according to claim 1, which is characterized in that first metallic conductor, second gold medal
Belong to the metallic conductor that conductor, the third metallic conductor and the 4th metallic conductor are respectively a snakelike shape.
6. signal transmission circuit according to claim 1, which is characterized in that first metallic conductor, second gold medal
Belonging to conductor, the third metallic conductor and the 4th metallic conductor is respectively a spiral helicine metallic conductor.
7. signal transmission circuit according to claim 1, which is characterized in that further include have one first additional metal conductor,
One second additional metal conductor, a third additional metal conductor and one the 4th additional metal conductor, first additional metal are led
One end of body is connected to the side of first metallic conductor, and one end of the second additional metal conductor is connected to described second
The side of metallic conductor, one end of the third additional metal conductor are connected to the side of the third metallic conductor, and described
One end of four additional metal conductors is connected to the side of the 4th metallic conductor, wherein the first additional metal conductor is another
One end and the other end of the second additional metal conductor are close to each other, and the other end of the third additional metal conductor and institute
The other end for stating the 4th additional metal conductor is close to each other.
8. signal transmission circuit according to claim 1, which is characterized in that the other end of first metallic conductor and institute
The other end for stating the second metallic conductor connects the fifth metal conductor via one first conductive through hole respectively, and the third is golden
The other end of the other end and the 4th metallic conductor that belong to conductor connects the 6th gold medal via one second conductive through hole respectively
Belong to conductor.
9. signal transmission circuit according to claim 1, which is characterized in that first metallic conductor includes one first
Line segment and a second line segment, second metallic conductor include a third line segment and one the 4th line segment, and the third metal is led
Body includes one the 5th line segment and one the 6th line segment, and the 4th metallic conductor includes one the 7th line segment and one the 8th line segment；
One end of the second line segment connect the fifth metal conductor and the other end via one first conductive through hole connection described first
One end of line segment, the other end of first line segment are first signal input end；One end of 4th line segment connects institute
State fifth metal conductor and the other end connects one end of the third line segment via one second conductive through hole, the third line segment
The other end is first signal output end；One end of 6th line segment connect the 6th metallic conductor and the other end via
One third conductive through hole connects one end of the 5th line segment, and the other end of the 5th line segment is second signal input
End；One end of 8th line segment connect the 6th metallic conductor and the other end via one the 4th conductive through hole connection described the
One end of seven line segments, the other end of the 7th line segment are second signal output end.
10. signal transmission circuit according to claim 9, which is characterized in that described the second of first metallic conductor
Line segment, the 4th line segment of second metallic conductor, the third metallic conductor the 6th line segment and the described 4th
The 8th line segment of metallic conductor is the metal wire sections of a spiral shape or a snakelike shape simultaneously.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710027892.8A CN106954334B (en) | 2017-01-16 | 2017-01-16 | Signal transmission circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710027892.8A CN106954334B (en) | 2017-01-16 | 2017-01-16 | Signal transmission circuit |
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| CN106954334B true CN106954334B (en) | 2019-04-05 |
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| TWI833683B (en) * | 2023-12-13 | 2024-02-21 | 安波科技股份有限公司 | Circuit board module |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201051424Y (en) * | 2007-02-27 | 2008-04-23 | 金桥科技股份有限公司 | Improved cable structure |
| CN103098560B (en) * | 2010-08-30 | 2015-11-25 | 株式会社藤仓 | Differential signaling circuit and manufacture method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI452954B (en) * | 2011-04-26 | 2014-09-11 | Hon Hai Prec Ind Co Ltd | Printed circuit board |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201051424Y (en) * | 2007-02-27 | 2008-04-23 | 金桥科技股份有限公司 | Improved cable structure |
| CN103098560B (en) * | 2010-08-30 | 2015-11-25 | 株式会社藤仓 | Differential signaling circuit and manufacture method thereof |
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