CN106102311B - The method that signal circuit and promotion receiving terminal receive the quality of signal - Google Patents
The method that signal circuit and promotion receiving terminal receive the quality of signal Download PDFInfo
- Publication number
- CN106102311B CN106102311B CN201610684988.7A CN201610684988A CN106102311B CN 106102311 B CN106102311 B CN 106102311B CN 201610684988 A CN201610684988 A CN 201610684988A CN 106102311 B CN106102311 B CN 106102311B
- Authority
- CN
- China
- Prior art keywords
- build
- out resistor
- resistance
- signal
- resistance value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000005540 biological transmission Effects 0.000 claims abstract description 12
- 230000005611 electricity Effects 0.000 claims description 4
- 230000001737 promoting effect Effects 0.000 claims description 2
- 230000008054 signal transmission Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 230000011664 signaling Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- 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
- H05K1/025—Impedance arrangements, e.g. impedance matching, reduction of parasitic impedance
-
- 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
- H05K2201/07—Electric details
- H05K2201/0776—Resistance and impedance
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Dc Digital Transmission (AREA)
Abstract
The present invention provides signal circuit and promoted receiving terminal receive signal quality method, the signal circuit, including：It is used for transmission the first signal wire and second signal line, the first build-out resistor, the second build-out resistor, third build-out resistor, receiving terminal of signal；First signal wire is connected with the first terminal of receiving terminal；Second signal line is connected with the Second terminal of receiving terminal；The first end of first build-out resistor is connected with the first signal wire, second end ground connection；The first end of second build-out resistor is connected with second signal line, second end ground connection；Third build-out resistor is connected with the first end for the resistance unit that the internal resistance of receiving terminal is constituted with the first signal wire, and second end is connected with second signal line；First build-out resistor, the second build-out resistor and resistance unit and the differential impedance and common code impedance of the first signal wire and second signal line match.The present invention provides the methods that signal circuit and promotion receiving terminal receive the quality of signal, can improve signal quality.
Description
Technical field
The present invention relates to electronic technology field, more particularly to signal circuit and promotion receiving terminal receives the matter of signal
The method of amount.
Background technology
In PCB (Printed Circuit Board, printed circuit board), in order to improve the quality of signal transmission, often
Signal is transmitted using the method for differential transfer, specifically, signal is transmitted by two signal wires, on the two signal wires
Signal amplitude is equal, opposite in phase, the signal that receiving terminal receives be equal to two complementations and be relatively reference signal it
Between difference therefore can greatly reduce the electrical noise effect of signal.But the process that signal transmits on signal wire
In, due to by transmission line differential impedance and common code impedance interfere, can reduce the quality of signal.Signal how is reduced to pass
Interference during defeated improves signal quality, becomes particularly important.
In the prior art, excellent from laminated construction, plank type selecting, the management and control of PCB impedance designs, wiring generally in Design PCB
Change machine connector type selecting etc. considers, to improve the quality of signal so that receiving terminal can receive the higher signal of quality.
The considerations of these aspects is all to be subject to differential impedance, is mainly used for eliminating the difference that is subject to of the signal when transmitting on signal wire
Divide the interference of impedance,
But signal quality is influenced by differential impedance and common code impedance two parts, the prior art only considers
The influence of differential impedance, and make common code impedance mismatch, increase due to causing common-mode noise that will be superimposed because reflecting, so that signal
Quality is relatively low.
Invention content
An embodiment of the present invention provides the methods that signal circuit and promotion receiving terminal receive the quality of signal, can
Improve signal quality.
On the one hand, an embodiment of the present invention provides a kind of signal circuits, including：
It is used for transmission the first signal wire and second signal line, the first build-out resistor, the second build-out resistor, third of signal
With resistance, receiving terminal；
First signal wire is connected with the first terminal of the receiving terminal；
The second signal line is connected with the Second terminal of the receiving terminal；
The first end of first build-out resistor is connected with first signal wire, second end ground connection；
The first end of second build-out resistor is connected with the second signal line, second end ground connection；
The first end for the resistance unit that the internal resistance of the third build-out resistor and the receiving terminal is constituted is believed with described first
Number line is connected, and second end is connected with the second signal line；
Wherein, first build-out resistor, second build-out resistor and the resistance unit and first signal
The differential impedance and common code impedance of line and the second signal line match.
Further, including：
First build-out resistor is equal with the resistance value of the second build-out resistor；
The resistance value of first build-out resistor and second build-out resistor meets formula one, wherein formula one is：
R1=R2=2Z1,
Wherein, R1Resistance value, R for first build-out resistor2For the resistance value of second build-out resistor, Z1It is described total
Mould impedance.
Further, including：
The resistance value of the resistance unit meets formula two, wherein the formula two is：
Wherein, RzFor the resistance value of the resistance unit, Z1For the common code impedance, Z2For the differential impedance.
Further, including：
When the resistance value of the internal resistance is more than the resistance value of the resistance unit, the first end of the third build-out resistor and institute
The first terminal for stating receiving terminal is connected, and second end is connected with the Second terminal of the receiving terminal, the resistance of the third build-out resistor
Value meets formula three, wherein the formula three is：
Wherein, R3For the resistance value of the third build-out resistor, RzFor the resistance value of the resistance unit, R0For the internal resistance；
When the internal resistance is less than or equal to the resistance value of the resistance unit, the third build-out resistor is connected on described first
Between signal wire and the receiving terminal, alternatively, the third build-out resistor is connected on the second signal line and the receiving terminal
Between, the resistance value of the third build-out resistor meets formula four, wherein the formula four is：
R3=Rz-R0,
Wherein, R3 is the resistance value of the third build-out resistor, RzFor the resistance value of the resistance unit, R0For the internal resistance.
Further, the first end of first build-out resistor is connected with the first terminal of the receiving terminal, the second termination
Ground.
Further, the first end of second build-out resistor is connected with the Second terminal of the receiving terminal, the second termination
Ground.
On the other hand, a kind of method that the quality of signal is received an embodiment of the present invention provides promotion receiving terminal, including：
Determine differential impedance and the common code impedance of the first signal wire and second signal line that are used for transmission signal；It determines and receives
The internal resistance at end；Determine the first build-out resistor to match with the differential impedance, the common code impedance, the second build-out resistor and
The resistance unit that third build-out resistor and the internal resistance are constituted；According to the internal resistance and the resistance unit, the third is determined
Build-out resistor；First signal wire is connected with the first terminal of the receiving terminal；The second signal line is connect with described
The Second terminal of receiving end is connected；The first end of first build-out resistor is connected with first signal wire, second end ground connection；
The first end of second build-out resistor is connected with the second signal line, second end ground connection；By the of the resistance unit
One end is connected with first signal wire, and second end is connected with the second signal line；Further include：
Using first signal wire and the second signal line, the receiving terminal is transferred signals to.
Further, the determination and the differential impedance, the common code impedance match the first build-out resistor, second
The resistance unit that build-out resistor and third build-out resistor and the internal resistance are constituted, including：
According to the common code impedance and formula one, the resistance of first build-out resistor and second build-out resistor is determined
Value, wherein the formula one is：
R1=R2=2Z1,
Wherein, R1Resistance value, R for first build-out resistor2For the resistance value of second build-out resistor, Z1It is described total
Mould impedance.
Further, the determination and the differential impedance, the common code impedance match the first build-out resistor, second
The resistance unit that build-out resistor and third build-out resistor and the internal resistance are constituted, including：
According to the differential impedance, the common code impedance and formula two, the resistance value of the resistance unit is determined, wherein institute
Stating formula two is：
Wherein, RzFor the resistance value of the resistance unit, Z1For the common code impedance, Z2For the differential impedance.
Further, when the resistance value of the internal resistance is more than the resistance value of the resistance unit,
It is described that the third build-out resistor is determined according to the internal resistance and the resistance unit, including：
According to the internal resistance, the resistance unit and formula three, the resistance value of the third build-out resistor is determined, wherein institute
Stating formula three is：
Wherein, R3For the resistance value of the third build-out resistor, RzFor the resistance value of the resistance unit, R0For the internal resistance
Resistance value；
The first end by the resistance unit is connected with first signal wire, second end and the second signal line
It is connected, including：
The first end of the third build-out resistor is connected with the first terminal of the receiving terminal, second end and the reception
The Second terminal at end is connected；
When the internal resistance is less than or equal to the resistance value of the resistance unit,
It is described that the third build-out resistor is determined according to the internal resistance and the resistance unit, including：
According to the internal resistance, the resistance unit and formula four, the resistance value of the third build-out resistor is determined, wherein institute
Stating formula four is：
R3=Rz-R0,
Wherein, R3For the resistance value of the third build-out resistor, RzFor the resistance value of the resistance unit, R0For the internal resistance
Resistance value；
The first end by the resistance unit is connected with first signal wire, second end and the second signal line
It is connected, including：
The third build-out resistor is connected between first signal wire and the receiving terminal, alternatively,
The third build-out resistor is connected between the second signal line and the receiving terminal.
Further, the first end by first build-out resistor is connected with first signal wire, the second termination
Ground, including：
The first end of first build-out resistor is connected with the first terminal of the receiving terminal, second end ground connection.
Further, the first end by second build-out resistor is connected with the second signal line, the second termination
Ground, including：
The first end of second build-out resistor is connected with the Second terminal of the receiving terminal, second end ground connection.
In embodiments of the present invention, the first end of the first build-out resistor is connected with the first signal wire, second end ground connection, and second
The first end of build-out resistor is connected with second signal line, second end ground connection, the internal resistance composition of third build-out resistor and receiving terminal
The first end of resistance unit is connected with the first signal wire, and second end is connected with second signal line, the first build-out resistor, the second matching
The differential impedance and common code impedance of resistance and resistance unit and the first signal wire and second signal line match, and pass through the first matching
Resistance, the second build-out resistor and resistance unit are realized the matching of differential impedance and common code impedance on signal transmission path, are reduced
The reflected intensity of differential mode energy and common mode energy in signal, and then improve the quality for the signal that receiving terminal receives.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is a kind of schematic diagram for signal circuit that one embodiment of the invention provides；
Fig. 2 is the schematic diagram for another signal circuit that one embodiment of the invention provides；
Fig. 3 is the schematic diagram for another signal circuit that one embodiment of the invention provides；
Fig. 4 is the flow of the method for the quality that a kind of promotion receiving terminal that one embodiment of the invention provides receives signal
Figure.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments, based on the embodiments of the present invention, those of ordinary skill in the art
The every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
As shown in Figure 1, an embodiment of the present invention provides a kind of signal circuits, including：
It is used for transmission the first signal wire 101 and second signal line 102, the first build-out resistor 103, second matching electricity of signal
Resistance 104, third build-out resistor 105, receiving terminal 106；
First signal wire 101 is connected with the first terminal of the receiving terminal 106；
The second signal line 102 is connected with the Second terminal of the receiving terminal 106；
The first end of first build-out resistor 103 is connected with first signal wire 101, second end ground connection；
The first end of second build-out resistor 104 is connected with the second signal line 102, second end ground connection；
The first end for the resistance unit 108 that the internal resistance 107 of the third build-out resistor 105 and the receiving terminal 106 is constituted
It is connected with first signal wire 101, second end is connected with the second signal line 102；
Wherein, first build-out resistor 103, second build-out resistor 104 and the resistance unit 108 with it is described
The differential impedance and common code impedance of first signal wire 101 and the second signal line 102 match.
In embodiments of the present invention, the first end of the first build-out resistor is connected with the first signal wire, second end ground connection, and second
The first end of build-out resistor is connected with second signal line, second end ground connection, the internal resistance composition of third build-out resistor and receiving terminal
The first end of resistance unit is connected with the first signal wire, and second end is connected with second signal line, the first build-out resistor, the second matching
The differential impedance and common code impedance of resistance and resistance unit and the first signal wire and second signal line match, and pass through the first matching
Resistance, the second build-out resistor and resistance unit are realized the matching of differential impedance and common code impedance on signal transmission path, are reduced
The reflected intensity of differential mode energy and common mode energy in signal, and then improve the quality for the signal that receiving terminal receives.
In order to further improve signal quality, in an embodiment of the present invention, which includes：
First build-out resistor is equal with the resistance value of the second build-out resistor；
The resistance value of first build-out resistor and second build-out resistor meets formula one, wherein formula one is：
R1=R2=2Z1,
Wherein, R1Resistance value, R for first build-out resistor2For the resistance value of second build-out resistor, Z1It is described total
Mould impedance.
In the present embodiment, the first build-out resistor and the second build-out resistor determined by formula one, can be better
Common code impedance is matched, can preferably reduce common-mode noise so that the shadow for the common-mode noise that the signal that receiving terminal receives is subject to
Smaller is rung, signal quality is improved.
For example, common code impedance 27.5ohm determines resistance value and the second matching of the first build-out resistor according to formula one
The resistance value of resistance is 55ohm.
In order to further improve signal quality, in an embodiment of the present invention, which includes：
The resistance value of the resistance unit meets formula two, wherein the formula two is：
Wherein, RzFor the resistance value of the resistance unit, Z1For the common code impedance, Z2For the differential impedance.
In embodiments of the present invention, the resistance value that resistance unit is determined by formula two, can be more preferable by resistance unit
Matching differential-mode impedance, can preferably reduce differential mode noise so that the differential mode noise that the signal that receiving terminal receives is subject to
Smaller is influenced, signal quality is improved.
For example, differential impedance 100ohm, common code impedance 27.5ohm determine resistance unit according to formula two
Resistance value is 1.1kohm.
In order to further improve signal quality, in an embodiment of the present invention, the signal circuit, including：It is described
The first end of first build-out resistor is connected with the first terminal of the receiving terminal, second end ground connection.
If there is a segment signal line between the first build-out resistor and the tie point and first terminal of the first signal wire, that
, this segment signal line can also interfere signal, in the present embodiment, the first terminal phase of the first build-out resistor and receiving terminal
It even, can to first terminal, this segment signal line causes to do to signal to avoid the tie point of the first build-out resistor and the first signal wire
It disturbs, further increases the quality for the signal that receiving terminal receives.
In an embodiment of the present invention, the signal circuit, including：The first end of second build-out resistor with it is described
The Second terminal of receiving terminal is connected, second end ground connection.
If there is a segment signal line between the second build-out resistor and the tie point and Second terminal of second signal line, that
, this segment signal line can also interfere signal, in the present embodiment, the Second terminal phase of the second build-out resistor and receiving terminal
It even, can to Second terminal, this segment signal line causes to do to signal to avoid the tie point of the second build-out resistor and second signal line
It disturbs, further increases the quality for the signal that receiving terminal receives.
Since receiving terminal has internal resistance, when matching differential impedance and common code impedance by resistance unit, need to examine internal resistance
Worry is entered, since internal resistance is likely larger than the resistance value of required resistance unit, it is also possible to be less than or equal to required resistance unit
Resistance value therefore in order to enable resistance unit can reach required resistance value, need to connect third build-out resistor with internal resistance
Or it is in parallel, the two specifically how to connect the magnitude relationship for the resistance value for needing the resistance value and required resistance unit according to internal resistance come
It determines.
When the resistance value of the internal resistance is more than the resistance value of the resistance unit, the first end of the third build-out resistor and institute
The first terminal for stating receiving terminal is connected, and second end is connected with the Second terminal of the receiving terminal, the resistance of the third build-out resistor
Value meets formula three, wherein the formula three is：
Wherein, R3For the resistance value of the third build-out resistor, RzFor the resistance value of the resistance unit, R0For the internal resistance.
In the present embodiment, since the resistance value of internal resistance is more than the resistance value of resistance unit, so needing to match electricity by third
Resistance is in parallel with internal resistance to realize the resistance value of resistance unit.In the case where third build-out resistor is in parallel with internal resistance, public affairs can be passed through
Formula three determines the resistance value of third build-out resistor.
As shown in Fig. 2, a kind of signal circuit provided in an embodiment of the present invention, including：
First signal wire 101, second signal line 102, the first build-out resistor 103, the second build-out resistor 104, third matching
Resistance 105, receiving terminal 106；
The first end of first build-out resistor 103 is connected with the first terminal 1061 of receiving terminal 106, second end ground connection；
The first end of second build-out resistor 104 is connected with the Second terminal 1062 of receiving terminal 106, second end ground connection；
The first end of third build-out resistor 105 is connected with the first terminal 1061 of receiving terminal 106, second end and receiving terminal
106 Second terminal 1062 is connected；
The internal resistance 107 of receiving terminal 106 is in parallel with third build-out resistor 105；
Wherein, the first build-out resistor 103 is equal with the resistance value of the second build-out resistor 104, the first build-out resistor 103 and second
The resistance value of build-out resistor 104 meets formula one；
The resistance value of resistance unit 108 meets formula two, and the resistance value of third build-out resistor 105 meets formula three.
When the internal resistance is less than or equal to the resistance value of the resistance unit, the third build-out resistor is connected on described first
Between signal wire and the receiving terminal, alternatively, the third build-out resistor is connected on the second signal line and the receiving terminal
Between, the resistance value of the third build-out resistor meets formula four, wherein the formula four is：
R3=Rz-R0,
Wherein, R3 is the resistance value of the third build-out resistor, RzFor the resistance value of the resistance unit, R0For the internal resistance.
In the present embodiment, since the resistance value of internal resistance is less than or equal to the resistance value of resistance unit, so needing through third
It is connected with internal resistance to realize the resistance value of resistance unit with resistance.Concatenated, the Ke Yitong in third build-out resistor and internal resistance
Cross the resistance value that formula three determines third build-out resistor.
In the present embodiment, when the resistance value of internal resistance is equal to the resistance value of resistance unit, the resistance value of third build-out resistor is 0,
Additional addition resistance is may not need, the matching to differential impedance can be realized by internal resistance.
As shown in figure 3, a kind of signal circuit provided in an embodiment of the present invention, including：
First signal wire 101, second signal line 102, the first build-out resistor 103, the second build-out resistor 104, third matching
Resistance 105, receiving terminal 106；
The first end of first build-out resistor 103 is connected with the first terminal 1061 of receiving terminal 106, second end ground connection；
The first end of second build-out resistor 104 is connected with the Second terminal 1062 of receiving terminal 106, second end ground connection；
The first end of third build-out resistor 105 is connected with the first signal wire 101, the first end of the other end and receiving terminal 106
Son 1061 is connected；
The internal resistance 107 of receiving terminal 106 is connected with third build-out resistor 105；
Wherein, the first build-out resistor 103 is equal with the resistance value of the second build-out resistor 104, the first build-out resistor 103 and second
The resistance value of build-out resistor 104 meets formula one；
The resistance value of resistance unit 108 meets formula two, and the resistance value of third build-out resistor 105 meets formula four.
In embodiments of the present invention, the first signal wire and second signal line can be a pair of of differential signal line, the first signal
What is transmitted on line and second signal line can be differential signal.
In embodiments of the present invention, by the first build-out resistor, the second build-out resistor and third build-out resistor, difference is realized
Divide and the requirement of common-mode signal impedance matching simultaneously, the reflected intensity of reduction signal on the transmit path, promotion signal transmit matter
Amount, improve high-frequency signal receiving terminal SI (Signal Integrity, signal integrity) signal quality.
In embodiments of the present invention, according to differential impedance in pcb board transmission path, common code impedance, formula one, formula two,
Formula three and formula four choose suitable first build-out resistor, the second build-out resistor and third build-out resistor, with this balanced signal
Differential-mode impedance in transmission path and common code impedance, on the P lines and N lines of the receiving terminal of differential signaling path respectively over the ground
The first build-out resistor and the second build-out resistor are connect, PI type circuits are built into the resistance unit of third build-out resistor and internal resistance, is led to
It crosses the PI type circuits of the receiving terminal, the impedance matching relationship of improvement signal on the transmit path, while balanced differential impedance and is total to
Mould impedance can effectively promote the impulse amplitude of differential signal, reduce the signal reflex of differential mode and common mode component in high-frequency signal, carry
Quality of the liter signal in receiving terminal.
As shown in figure 4, a kind of method for promoting receiving terminal and receiving the quality of signal provided in an embodiment of the present invention, packet
It includes：
Step 401：Determine differential impedance and the common code impedance of the first signal wire and second signal line that are used for transmission signal；
Step 402：Determine the internal resistance of receiving terminal；
Step 403：Determine that the first build-out resistor to match with the differential impedance, the common code impedance, second match
The resistance unit that resistance and third build-out resistor and the internal resistance are constituted；
Step 404：According to the internal resistance and the resistance unit, the third build-out resistor is determined；
Step 405：First signal wire is connected with the first terminal of the receiving terminal；
Step 406：The second signal line is connected with the Second terminal of the receiving terminal；
Step 407：The first end of first build-out resistor is connected with first signal wire, second end ground connection；
Step 408：The first end of second build-out resistor is connected with the second signal line, second end ground connection；
Step 409：The first end of the resistance unit is connected with first signal wire, second end is believed with described second
Number line is connected；
Step 410：Using first signal wire and the second signal line, the receiving terminal is transferred signals to.
In an embodiment of the present invention, match first of the determination and the differential impedance, the common code impedance
With the resistance unit that resistance, the second build-out resistor and third build-out resistor and the internal resistance are constituted, including：
According to the common code impedance and formula one, the resistance of first build-out resistor and second build-out resistor is determined
Value, wherein the formula one is：
R1=R2=2Z1,
Wherein, R1Resistance value, R for first build-out resistor2For the resistance value of second build-out resistor, Z1It is described total
Mould impedance.
In an embodiment of the present invention, match first of the determination and the differential impedance, the common code impedance
With the resistance unit that resistance, the second build-out resistor and third build-out resistor and the internal resistance are constituted, including：
According to the differential impedance, the common code impedance and formula two, the resistance value of the resistance unit is determined, wherein institute
Stating formula two is：
Wherein, RzFor the resistance value of the resistance unit, Z1For the common code impedance, Z2For the differential impedance.
In an embodiment of the present invention, when the resistance value of the internal resistance is more than the resistance value of the resistance unit,
It is described that the third build-out resistor is determined according to the internal resistance and the resistance unit, including：
According to the internal resistance, the resistance unit and formula three, the resistance value of the third build-out resistor is determined, wherein institute
Stating formula three is：
Wherein, R3For the resistance value of the third build-out resistor, RzFor the resistance value of the resistance unit, R0For the internal resistance
Resistance value；
The first end by the resistance unit is connected with first signal wire, second end and the second signal line
It is connected, including：
The first end of the third build-out resistor is connected with the first terminal of the receiving terminal, second end and the reception
The Second terminal at end is connected；
When the internal resistance is less than or equal to the resistance value of the resistance unit,
It is described that the third build-out resistor is determined according to the internal resistance and the resistance unit, including：
According to the internal resistance, the resistance unit and formula four, the resistance value of the third build-out resistor is determined, wherein institute
Stating formula four is：
R3=Rz-R0,
Wherein, R3For the resistance value of the third build-out resistor, RzFor the resistance value of the resistance unit, R0For the internal resistance
Resistance value；
The first end by the resistance unit is connected with first signal wire, second end and the second signal line
It is connected, including：
The third build-out resistor is connected between first signal wire and the receiving terminal, alternatively,
The third build-out resistor is connected between the second signal line and the receiving terminal.
In an embodiment of the present invention, the first end by first build-out resistor and the first signal wire phase
Even, second end ground connection, including：
The first end of first build-out resistor is connected with the first terminal of the receiving terminal, second end ground connection.
In an embodiment of the present invention, the first end by second build-out resistor and the second signal line phase
Even, second end ground connection, including：
The first end of second build-out resistor is connected with the Second terminal of the receiving terminal, second end ground connection.
In an embodiment of the present invention, the differential impedance of the first signal wire and second signal line that are used for transmission signal is determined
And common code impedance, it can be realized by following steps：
Determine the odd mode impedance and even mode impedance of first signal wire and the second signal line；
According to odd mode impedance and formula five, differential impedance is determined, wherein formula five is：
Z2=2Zd,
Wherein, Z2For differential impedance, ZdFor odd mode impedance.
According to even mode impedance and formula six, common code impedance is determined, wherein formula six is：
Wherein, Z1For common code impedance, ZcFor even mode impedance.
The each embodiment of the present invention at least has the advantages that：
1, in embodiments of the present invention, the first end of the first build-out resistor is connected with the first signal wire, second end ground connection, the
The first end of two build-out resistors is connected with second signal line, and the internal resistance of second end ground connection, third build-out resistor and receiving terminal is constituted
The first end of resistance unit be connected with the first signal wire, second end is connected with second signal line, the first build-out resistor, second
Differential impedance and common code impedance with resistance and resistance unit and the first signal wire and second signal line match, and pass through first
With resistance, the second build-out resistor and resistance unit, the matching of differential impedance and common code impedance on signal transmission path is realized, reduce
The reflected intensity of differential mode energy and common mode energy in signal, and then improve the quality for the signal that receiving terminal receives.
2, in the present embodiment, the first build-out resistor and the second build-out resistor determined by formula one, can be more preferable
Matching common code impedance, can preferably reduce common-mode noise so that the common-mode noise that the signal that receiving terminal receives is subject to
Smaller is influenced, signal quality is improved.
3, in embodiments of the present invention, the resistance value that resistance unit is determined by formula two, can be more by resistance unit
Good matching differential-mode impedance, can preferably reduce differential mode noise so that the differential mode noise that the signal that receiving terminal receives is subject to
Influence smaller, improve signal quality.
4, in embodiments of the present invention, it by the first build-out resistor, the second build-out resistor and third build-out resistor, realizes
The requirement of difference and common-mode signal impedance matching simultaneously reduces the reflected intensity of signal on the transmit path, promotion signal transmission
Quality, improve high-frequency signal receiving terminal SI signal qualities.
5, in embodiments of the present invention, according to differential impedance, common code impedance, formula one, formula in pcb board transmission path
Two, formula three and formula four are chosen suitable first build-out resistor, the second build-out resistor and third build-out resistor, are balanced with this
Differential-mode impedance on signal transmission path and common code impedance, on the P lines and N lines of the receiving terminal of differential signaling path respectively
The first build-out resistor and the second build-out resistor are connect over the ground, and PI type electricity is built into the resistance unit of third build-out resistor and internal resistance
Road improves the impedance matching relationship of signal on the transmit path, while balanced differential impedance by the PI type circuits of the receiving terminal
And common code impedance, the impulse amplitude of differential signal can be effectively promoted, it is anti-to reduce the signal of differential mode and common mode component in high-frequency signal
It penetrates, quality of the promotion signal in receiving terminal.
It should be noted that herein, such as first and second etc relational terms are used merely to an entity
Or operation is distinguished with another entity or operation, is existed without necessarily requiring or implying between these entities or operation
Any actual relationship or order.Moreover, the terms "include", "comprise" or its any other variant be intended to it is non-
It is exclusive to include, so that the process, method, article or equipment including a series of elements includes not only those elements,
But also include other elements that are not explicitly listed, or further include solid by this process, method, article or equipment
Some elements.In the absence of more restrictions, the element limited by sentence " including a 〃 ", is not arranged
Except there is also other identical factors in the process, method, article or apparatus that includes the element.
One of ordinary skill in the art will appreciate that：Realize that all or part of step of above method embodiment can pass through
The relevant hardware of program instruction is completed, and program above-mentioned can be stored in computer-readable storage medium, the program
When being executed, step including the steps of the foregoing method embodiments is executed；And storage medium above-mentioned includes：ROM, RAM, magnetic disc or light
In the various media that can store program code such as disk.
Finally, it should be noted that：The foregoing is merely presently preferred embodiments of the present invention, is merely to illustrate the skill of the present invention
Art scheme, is not intended to limit the scope of the present invention.Any modification for being made all within the spirits and principles of the present invention,
Equivalent replacement, improvement etc., are included within the scope of protection of the present invention.
Claims (6)
1. a kind of signal circuit, which is characterized in that including：
It is used for transmission the first signal wire and second signal line, the first build-out resistor, the second build-out resistor, third matching electricity of signal
Resistance, receiving terminal；
First signal wire is connected with the first terminal of the receiving terminal；
The second signal line is connected with the Second terminal of the receiving terminal；
The first end of first build-out resistor is connected with first signal wire, second end ground connection；
The first end of second build-out resistor is connected with the second signal line, second end ground connection；
The first end for the resistance unit that the internal resistance of the third build-out resistor and the receiving terminal is constituted and first signal wire
It is connected, second end is connected with the second signal line；
Wherein, first build-out resistor, second build-out resistor and the resistance unit and first signal wire and
The differential impedance of the second signal line and common code impedance match；
First build-out resistor is equal with the resistance value of the second build-out resistor；
The resistance value of first build-out resistor and second build-out resistor meets formula one, wherein formula one is：
R1=R2=2Z1,
Wherein, R1Resistance value, R for first build-out resistor2For the resistance value of second build-out resistor, Z1It is hindered for the common mode
It is anti-；
The resistance value of the resistance unit meets formula two, wherein the formula two is：
Wherein, RzFor the resistance value of the resistance unit, Z1For the common code impedance, Z2For the differential impedance.
2. signal circuit according to claim 1, which is characterized in that including：
When the resistance value of the internal resistance is more than the resistance value of the resistance unit, the first end of the third build-out resistor connects with described
The first terminal of receiving end is connected, and second end is connected with the Second terminal of the receiving terminal, and the resistance value of the third build-out resistor is full
Sufficient formula three, wherein the formula three is：
Wherein, R3For the resistance value of the third build-out resistor, RzFor the resistance value of the resistance unit, R0For the internal resistance；
When the internal resistance is less than or equal to the resistance value of the resistance unit, the third build-out resistor is connected on first signal
Between line and the receiving terminal, alternatively, the third build-out resistor is connected between the second signal line and the receiving terminal,
The resistance value of the third build-out resistor meets formula four, wherein the formula four is：
R3=Rz-R0,
Wherein, R3 is the resistance value of the third build-out resistor, RzFor the resistance value of the resistance unit, R0For the internal resistance.
3. according to any signal circuit in claim 1-2, which is characterized in that including：
The first end of first build-out resistor is connected with the first terminal of the receiving terminal, second end ground connection；
And/or
The first end of second build-out resistor is connected with the Second terminal of the receiving terminal, second end ground connection.
4. a kind of method for promoting receiving terminal and receiving the quality of signal, which is characterized in that
Determine differential impedance and the common code impedance of the first signal wire and second signal line that are used for transmission signal；Determine receiving terminal
Internal resistance；Determine the first build-out resistor, the second build-out resistor and the third to match with the differential impedance, the common code impedance
The resistance unit that build-out resistor and the internal resistance are constituted；According to the internal resistance and the resistance unit, the third matching is determined
Resistance；First signal wire is connected with the first terminal of the receiving terminal；By the second signal line and the receiving terminal
Second terminal be connected；The first end of first build-out resistor is connected with first signal wire, second end ground connection；By institute
The first end for stating the second build-out resistor is connected with the second signal line, second end ground connection；By the first end of the resistance unit
It is connected with first signal wire, second end is connected with the second signal line；Further include：
Using first signal wire and the second signal line, the receiving terminal is transferred signals to；
The first build-out resistor that the determination and the differential impedance, the common code impedance match, the second build-out resistor and
The resistance unit that third build-out resistor and the internal resistance are constituted, including：
According to the common code impedance and formula one, the resistance value of first build-out resistor and second build-out resistor is determined,
In, the formula one is：
R1=R2=2Z1,
Wherein, R1Resistance value, R for first build-out resistor2For the resistance value of second build-out resistor, Z1It is hindered for the common mode
It is anti-；
The first build-out resistor that the determination and the differential impedance, the common code impedance match, the second build-out resistor and
The resistance unit that third build-out resistor and the internal resistance are constituted, including：
According to the differential impedance, the common code impedance and formula two, the resistance value of the resistance unit is determined, wherein the public affairs
Formula two is：
Wherein, RzFor the resistance value of the resistance unit, Z1For the common code impedance, Z2For the differential impedance.
5. according to the method described in claim 4, it is characterized in that,
When the resistance value of the internal resistance is more than the resistance value of the resistance unit,
It is described that the third build-out resistor is determined according to the internal resistance and the resistance unit, including：
According to the internal resistance, the resistance unit and formula three, the resistance value of the third build-out resistor is determined, wherein the public affairs
Formula three is：
Wherein, R3For the resistance value of the third build-out resistor, RzFor the resistance value of the resistance unit, R0For the resistance value of the internal resistance；
The first end by the resistance unit is connected with first signal wire, second end and the second signal line phase
Connect, including：
The first end of the third build-out resistor is connected with the first terminal of the receiving terminal, second end and the receiving terminal
Second terminal is connected；
When the internal resistance is less than or equal to the resistance value of the resistance unit,
It is described that the third build-out resistor is determined according to the internal resistance and the resistance unit, including：
According to the internal resistance, the resistance unit and formula four, the resistance value of the third build-out resistor is determined, wherein the public affairs
Formula four is：
R3=Rz-R0,
Wherein, R3For the resistance value of the third build-out resistor, RzFor the resistance value of the resistance unit, R0For the resistance value of the internal resistance；
The first end by the resistance unit is connected with first signal wire, second end and the second signal line phase
Connect, including：
The third build-out resistor is connected between first signal wire and the receiving terminal, alternatively,
The third build-out resistor is connected between the second signal line and the receiving terminal.
6. according to any method in claim 4-5, which is characterized in that
The first end by first build-out resistor is connected with first signal wire, second end ground connection, including：
The first end of first build-out resistor is connected with the first terminal of the receiving terminal, second end ground connection；
And/or
The first end by second build-out resistor is connected with the second signal line, second end ground connection, including：
The first end of second build-out resistor is connected with the Second terminal of the receiving terminal, second end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610684988.7A CN106102311B (en) | 2016-08-18 | 2016-08-18 | The method that signal circuit and promotion receiving terminal receive the quality of signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610684988.7A CN106102311B (en) | 2016-08-18 | 2016-08-18 | The method that signal circuit and promotion receiving terminal receive the quality of signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106102311A CN106102311A (en) | 2016-11-09 |
| CN106102311B true CN106102311B (en) | 2018-10-19 |
Family
ID=58070781
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610684988.7A Active CN106102311B (en) | 2016-08-18 | 2016-08-18 | The method that signal circuit and promotion receiving terminal receive the quality of signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106102311B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110798963B (en) * | 2019-09-24 | 2022-11-15 | 惠州市金百泽电路科技有限公司 | Control method for amplitude consistency of 5G antenna PCB |
| CN110995544A (en) * | 2019-12-19 | 2020-04-10 | 四川经纬达科技集团有限公司 | S parameter single-port differential test equipment and test method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101441606A (en) * | 2007-09-26 | 2009-05-27 | 英特尔公司 | Component-less termination for electromagnetic couplers used in high speed/frequency differential signaling |
| CN104703097A (en) * | 2015-03-04 | 2015-06-10 | 青岛歌尔声学科技有限公司 | Audio ground loop noise inhibiting system and method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101072469A (en) * | 2006-05-12 | 2007-11-14 | 英业达股份有限公司 | Trans-slot high-speed signal transmission line structure |
| US8744378B2 (en) * | 2012-02-09 | 2014-06-03 | Texas Instruments Incorporated | LINC transmitter with improved efficiency |
| CN204884149U (en) * | 2015-06-24 | 2015-12-16 | 河南卓正电子科技有限公司 | A MBUS converting circuit for collector |
-
2016
- 2016-08-18 CN CN201610684988.7A patent/CN106102311B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101441606A (en) * | 2007-09-26 | 2009-05-27 | 英特尔公司 | Component-less termination for electromagnetic couplers used in high speed/frequency differential signaling |
| CN104703097A (en) * | 2015-03-04 | 2015-06-10 | 青岛歌尔声学科技有限公司 | Audio ground loop noise inhibiting system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106102311A (en) | 2016-11-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5665455B2 (en) | Signal transmission circuit, transmission device and circuit board | |
| JP6227391B2 (en) | Passive equalizer | |
| US7545652B2 (en) | Printed circuit board and differential signaling structure | |
| JP5582248B2 (en) | Transmission system and backplane system construction method | |
| CN106102311B (en) | The method that signal circuit and promotion receiving terminal receive the quality of signal | |
| TWI528742B (en) | Emi suppression device and method for network transmission | |
| US20070089072A1 (en) | Signal transmission structure | |
| US20160285148A1 (en) | Differential transmission line having quarter wavelength differential coupler to reduce common mode noise | |
| JP5300584B2 (en) | Signal equalizer | |
| JP2011129996A (en) | Noise filter components, noise filter structure, and using method for noise filter components | |
| CN103378507B (en) | Electric connector | |
| CN103022818B (en) | Electric connector | |
| CN103814558B (en) | Conveyer | |
| US6366972B1 (en) | Multi-user communication bus with a resistive star configuration termination | |
| TWI566654B (en) | Circuit topology for multiple loads | |
| CN112187606B (en) | FC-AE-1553 network system | |
| EP3836395B1 (en) | Noise suppressor | |
| US11528045B2 (en) | Signal transmission device | |
| TW201417525A (en) | Equalizer | |
| TWI358974B (en) | Topology layout structure of multiple loads | |
| WO2022040998A1 (en) | Circuit and apparatus for controller area network communication | |
| Norte | The impact of high-speed de-emphasis and multi-stage passive rc equalization on the radiated EMI and signal integrity performances of a 5Gbs microstrip channel | |
| JP2008199094A (en) | Power supply line communication system | |
| JP4726685B2 (en) | Network topology configuration | |
| TWI558101B (en) | Differntial transmission circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |