CN106102311A - Signal circuit and lifting receiving terminal receive the method for the quality of signal - Google Patents

Abstract

The invention provides signal circuit and promote the method that receiving terminal receives the quality of signal, this signal circuit, including: for transmitting the first holding wire and secondary signal line, the first build-out resistor, the second build-out resistor, the 3rd build-out resistor, the receiving terminal of signal；First holding wire is connected with the first terminal of receiving terminal；Secondary signal line is connected with the second terminal of receiving terminal；First end of the first build-out resistor and the first holding wire are connected, the second end ground connection；First end of the second build-out resistor is connected with secondary signal line, the second end ground connection；First end and first holding wire of the resistance unit that the 3rd build-out resistor is constituted with the internal resistance of receiving terminal are connected, and the second end is connected with secondary signal line；First build-out resistor, the second build-out resistor and resistance unit and the first holding wire and the differential impedance of secondary signal line and common code impedance match.The invention provides signal circuit and promote the method that receiving terminal receives the quality of signal, it is possible to increase signal quality.

Description

Signal circuit and lifting receiving terminal receive the method for the quality of signal

Technical field

The present invention relates to electronic technology field, receive the matter of signal particularly to signal circuit and lifting receiving terminal The method of amount.

Background technology

In PCB (Printed Circuit Board, printed circuit board), in order to improve the quality of signal transmission, often The method using differential transfer transmits signal, specifically, transmits signal by two holding wires, on the two holding wire Signal amplitude is equal, opposite in phase, the signal that receiving terminal receives equal to two complementations and be relatively reference signal it Between difference, therefore, it can greatly reduce the electrical noise effect of signal.But, the process that signal transmits on holding wire In, due to disturbing by the differential impedance of transmission line and common code impedance, the quality of signal can be reduced.How to reduce signal passing Interference during defeated, improves signal quality, becomes particularly important.

In prior art, typically when Design PCB, from laminated construction, sheet material type selecting, PCB impedance design management and control, connect up excellent From the standpoint of change machine adapter type selecting etc., improve the quality of signal so that receiving terminal is able to receive that the higher signal of quality. Consideration in terms of these is all to be as the criterion with differential impedance, is mainly used for eliminating the difference being subject to when signal transmits on holding wire Divide the interference of impedance,

But, signal quality be affected by differential impedance and common code impedance two parts impact, prior art simply considers The impact of differential impedance, and make common code impedance mismatch, cause common-mode noise will to increase because of reflection superposition, and then make signal Quality is relatively low.

Summary of the invention

Embodiments provide signal circuit and promote the method that receiving terminal receives the quality of signal, it is possible to Improve signal quality.

On the one hand, embodiments provide a kind of signal circuit, including:

For transmit the first holding wire of signal and secondary signal line, the first build-out resistor, the second build-out resistor, the 3rd Distribution resistance, receiving terminal；

Described first holding wire is connected with the first terminal of described receiving terminal；

Described secondary signal line is connected with the second terminal of described receiving terminal；

First end of described first build-out resistor is connected with described first holding wire, the second end ground connection；

First end of described second build-out resistor is connected with described secondary signal line, the second end ground connection；

First end of the resistance unit that described 3rd build-out resistor is constituted with the internal resistance of described receiving terminal and described first letter Number line is connected, and the second end is connected with described secondary signal line；

Wherein, described first build-out resistor, described second build-out resistor and described resistance unit and described first signal Line and the differential impedance of described secondary signal line and common code impedance match.

Further, including:

Described first build-out resistor is equal with the resistance of described second build-out resistor；

The resistance of described first build-out resistor and described second build-out resistor meets formula one, and wherein, formula one is:

R₁=R₂=2Z₁,

Wherein, R₁Resistance, R for described first build-out resistor₂For the resistance of described second build-out resistor, Z₁For described common Mould impedance.

Further, including:

The resistance of described resistance unit meets formula two, and wherein, described formula two is:

$R_z=\frac{4Z_1\×Z_2}{4Z_1-Z_2},$

Wherein, R_zFor the resistance of described resistance unit, Z₁For described common code impedance, Z₂For described differential impedance.

Further, including:

When the resistance of described internal resistance is more than the resistance of described resistance unit, the first end of described 3rd build-out resistor and institute The first terminal stating receiving terminal is connected, and the second end is connected with the second terminal of described receiving terminal, the resistance of described 3rd build-out resistor Value meets formula three, and wherein, described formula three is:

$R_3=\frac{R_z{R}_0}{R_0-R_z},$

Wherein, R₃For the resistance of described 3rd build-out resistor, R_zFor the resistance of described resistance unit, R₀For described internal resistance；

When described internal resistance is less than or equal to the resistance of described resistance unit, described 3rd build-out resistor is connected on described first Between holding wire and described receiving terminal, or, described 3rd build-out resistor is connected on described secondary signal line and described receiving terminal Between, the resistance of described 3rd build-out resistor meets formula four, and wherein, described formula four is:

R₃=R_z-R₀,

Wherein, R3 is the resistance of described 3rd build-out resistor, R_zFor the resistance of described resistance unit, R₀For described internal resistance.

Further, the first end of described first build-out resistor is connected with the first terminal of described receiving terminal, the second termination Ground.

Further, the first end of described second build-out resistor is connected with the second terminal of described receiving terminal, the second termination Ground.

On the other hand, embodiments provide and a kind of promote the method that receiving terminal receives the quality of signal, including:

Determine the first holding wire for transmitting signal and the differential impedance of secondary signal line and common code impedance；Determine reception The internal resistance of end；Determine match with described differential impedance, described common code impedance the first build-out resistor, the second build-out resistor and The resistance unit that 3rd build-out resistor and described internal resistance are constituted；According to described internal resistance and described resistance unit, determine the described 3rd Build-out resistor；Described first holding wire is connected with the first terminal of described receiving terminal；Described secondary signal line is connect with described Second terminal of receiving end is connected；First end of described first build-out resistor is connected with described first holding wire, the second end ground connection； First end of described second build-out resistor is connected with described secondary signal line, the second end ground connection；By the of described resistance unit One end is connected with described first holding wire, and the second end is connected with described secondary signal line；Also include:

Utilize described first holding wire and described secondary signal line, transfer signals to described receiving terminal.

Further, described determine match with described differential impedance, described common code impedance the first build-out resistor, second The resistance unit that build-out resistor and the 3rd build-out resistor and described internal resistance are constituted, including:

According to described common code impedance and formula one, determine described first build-out resistor and the resistance of described second build-out resistor Value, wherein, described formula one is:

R₁=R₂=2Z₁,

Wherein, R₁Resistance, R for described first build-out resistor₂For the resistance of described second build-out resistor, Z₁For described common Mould impedance.

Further, described determine match with described differential impedance, described common code impedance the first build-out resistor, second The resistance unit that build-out resistor and the 3rd build-out resistor and described internal resistance are constituted, including:

According to described differential impedance, described common code impedance and formula two, determine the resistance of described resistance unit, wherein, institute Stating formula two is:

$R_z=\frac{4Z_1\×Z_2}{4Z_1-Z_2},$

Wherein, R_zFor the resistance of described resistance unit, Z₁For described common code impedance, Z₂For described differential impedance.

Further, when the resistance of described internal resistance is more than the resistance of described resistance unit,

Described according to described internal resistance with described resistance unit, determine described 3rd build-out resistor, including:

According to described internal resistance, described resistance unit and formula three, determine the resistance of described 3rd build-out resistor, wherein, institute Stating formula three is:

$R_3=\frac{R_z{R}_0}{R_0-R_z},$

Wherein, R₃For the resistance of described 3rd build-out resistor, R_zFor the resistance of described resistance unit, R₀For described internal resistance Resistance；

Described first end of described resistance unit is connected with described first holding wire, the second end and described secondary signal line It is connected, including:

Described first end of the 3rd build-out resistor is connected with the first terminal of described receiving terminal, the second end and described reception Second terminal of end is connected；

When described internal resistance is less than or equal to the resistance of described resistance unit,

Described according to described internal resistance with described resistance unit, determine described 3rd build-out resistor, including:

According to described internal resistance, described resistance unit and formula four, determine the resistance of described 3rd build-out resistor, wherein, institute Stating formula four is:

R₃=R_z-R₀,

Wherein, R₃For the resistance of described 3rd build-out resistor, R_zFor the resistance of described resistance unit, R₀For described internal resistance Resistance；

Described first end of described resistance unit is connected with described first holding wire, the second end and described secondary signal line It is connected, including:

Described 3rd build-out resistor is connected between described first holding wire and described receiving terminal, or,

Described 3rd build-out resistor is connected between described secondary signal line and described receiving terminal.

Further, described first end of described first build-out resistor is connected with described first holding wire, the second termination Ground, including:

First end of described first build-out resistor is connected with the first terminal of described receiving terminal, the second end ground connection.

Further, described first end of described second build-out resistor is connected with described secondary signal line, the second termination Ground, including:

First end of described second build-out resistor is connected with the second terminal of described receiving terminal, the second end ground connection.

In embodiments of the present invention, the first end of the first build-out resistor and the first holding wire are connected, the second end ground connection, and second First end of build-out resistor is connected with secondary signal line, the second end ground connection, and the internal resistance of the 3rd build-out resistor and receiving terminal is constituted First end of resistance unit and the first holding wire are connected, and the second end is connected with secondary signal line, the first build-out resistor, the second coupling Resistance and resistance unit and the first holding wire and the differential impedance of secondary signal line and common code impedance match, by the first coupling Resistance, the second build-out resistor and resistance unit, it is achieved differential impedance and the coupling of common code impedance on signal transmission path, reduce Differential mode energy and the reflex strength of common mode energy in signal, and then improve the quality of the signal that receiving terminal receives.

Accompanying drawing explanation

In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is the present invention Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to according to These accompanying drawings obtain other accompanying drawing.

Fig. 1 is the schematic diagram of a kind of signal circuit that one embodiment of the invention provides；

Fig. 2 is the schematic diagram of another signal circuit that one embodiment of the invention provides；

Fig. 3 is the schematic diagram of another signal circuit that one embodiment of the invention provides；

What Fig. 4 was that one embodiment of the invention provides a kind of promotes the flow process of method that receiving terminal receives the quality of signal Figure.

Detailed description of the invention

For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the embodiment of the present invention In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is The a part of embodiment of the present invention rather than whole embodiments, based on the embodiment in the present invention, those of ordinary skill in the art The every other embodiment obtained on the premise of not making creative work, broadly falls into the scope of protection of the invention.

As it is shown in figure 1, embodiments provide a kind of signal circuit, including:

The first holding wire 101 and secondary signal line the 102, first build-out resistor 103, second for transmitting signal mate electricity Resistance the 104, the 3rd build-out resistor 105, receiving terminal 106；

Described first holding wire 101 is connected with the first terminal of described receiving terminal 106；

Described secondary signal line 102 is connected with the second terminal of described receiving terminal 106；

First end of described first build-out resistor 103 is connected with described first holding wire 101, the second end ground connection；

First end of described second build-out resistor 104 is connected with described secondary signal line 102, the second end ground connection；

First end of the resistance unit 108 that the internal resistance 107 of described 3rd build-out resistor 105 and described receiving terminal 106 is constituted Being connected with described first holding wire 101, the second end is connected with described secondary signal line 102；

Wherein, described first build-out resistor 103, described second build-out resistor 104 and described resistance unit 108 are with described First holding wire 101 and the differential impedance of described secondary signal line 102 and common code impedance match.

In embodiments of the present invention, the first end of the first build-out resistor and the first holding wire are connected, the second end ground connection, and second First end of build-out resistor is connected with secondary signal line, the second end ground connection, and the internal resistance of the 3rd build-out resistor and receiving terminal is constituted First end of resistance unit and the first holding wire are connected, and the second end is connected with secondary signal line, the first build-out resistor, the second coupling Resistance and resistance unit and the first holding wire and the differential impedance of secondary signal line and common code impedance match, by the first coupling Resistance, the second build-out resistor and resistance unit, it is achieved differential impedance and the coupling of common code impedance on signal transmission path, reduce Differential mode energy and the reflex strength of common mode energy in signal, and then improve the quality of the signal that receiving terminal receives.

In order to further improve signal quality, in an embodiment of the present invention, this signal circuit includes:

Described first build-out resistor is equal with the resistance of described second build-out resistor；

The resistance of described first build-out resistor and described second build-out resistor meets formula one, and wherein, formula one is:

R₁=R₂=2Z₁,

Wherein, R₁Resistance, R for described first build-out resistor₂For the resistance of described second build-out resistor, Z₁For described common Mould impedance.

In the present embodiment, the first build-out resistor determined by formula one and the second build-out resistor, can be more preferable Coupling common code impedance, it is possible to preferably reduce common-mode noise so that the shadow of the common-mode noise that the signal that receiving terminal receives is subject to Ring less, improve signal quality.

For example, common code impedance is 27.5ohm, determines resistance and second coupling of the first build-out resistor according to formula one The resistance of resistance is 55ohm.

In order to further improve signal quality, in an embodiment of the present invention, this signal circuit includes:

The resistance of described resistance unit meets formula two, and wherein, described formula two is:

$R_z=\frac{4Z_1\×Z_2}{4Z_1-Z_2},$

Wherein, R_zFor the resistance of described resistance unit, Z₁For described common code impedance, Z₂For described differential impedance.

In embodiments of the present invention, determined the resistance of resistance unit by formula two, can be more preferable by resistance unit Coupling differential-mode impedance, it is possible to preferably reduce differential mode noise so that the differential mode noise that the signal that receiving terminal receives is subject to Affect less, improve signal quality.

For example, differential impedance is 100ohm, and common code impedance is 27.5ohm, determines resistance unit according to formula two Resistance is 1.1kohm.

In order to further improve signal quality, in an embodiment of the present invention, this signal circuit, including: described First end of the first build-out resistor is connected with the first terminal of described receiving terminal, the second end ground connection.

If also having a segment signal line between the first build-out resistor and the junction point of the first holding wire and the first terminal, that , signal also can be disturbed by this segment signal line, in the present embodiment, and the first terminal phase of the first build-out resistor and receiving terminal Even, this segment signal line of the first build-out resistor and the junction point of the first holding wire to the first terminal can be avoided signal to be caused dry Disturb, improve the quality of the signal that receiving terminal receives further.

In an embodiment of the present invention, this signal circuit, including: the first end of described second build-out resistor is with described Second terminal of receiving terminal is connected, the second end ground connection.

If also having a segment signal line between the second build-out resistor and the junction point of secondary signal line and the second terminal, that , signal also can be disturbed by this segment signal line, in the present embodiment, and the second terminal phase of the second build-out resistor and receiving terminal Even, the second build-out resistor can be avoided signal to be caused dry with this segment signal line of the junction point of secondary signal line to the second terminal Disturb, improve the quality of the signal that receiving terminal receives further.

Owing to receiving terminal has internal resistance, when by resistance unit coupling differential impedance and common code impedance, need to examine internal resistance Worry is entered, owing to internal resistance is likely larger than the resistance of required resistance unit, it is also possible to less than or equal to required resistance unit Resistance, therefore, so that resistance unit can reach required resistance, need to connect the 3rd build-out resistor with internal resistance Or in parallel, the most how the two connects needs is come with the magnitude relationship of the resistance of required resistance unit according to the resistance of internal resistance Determine.

When the resistance of described internal resistance is more than the resistance of described resistance unit, the first end of described 3rd build-out resistor and institute The first terminal stating receiving terminal is connected, and the second end is connected with the second terminal of described receiving terminal, the resistance of described 3rd build-out resistor Value meets formula three, and wherein, described formula three is:

$R_3=\frac{R_z{R}_0}{R_0-R_z},$

Wherein, R₃For the resistance of described 3rd build-out resistor, R_zFor the resistance of described resistance unit, R₀For described internal resistance.

In the present embodiment, owing to the resistance of internal resistance is more than the resistance of resistance unit, so needing by the 3rd coupling electricity Hinder the resistance that realize resistance unit in parallel with internal resistance.In the case of the 3rd build-out resistor is in parallel with internal resistance, can be by public affairs Formula three determines the resistance of the 3rd build-out resistor.

As in figure 2 it is shown, a kind of signal circuit that the embodiment of the present invention provides, including:

First holding wire 101, secondary signal line the 102, first build-out resistor the 103, second build-out resistor the 104, the 3rd are mated Resistance 105, receiving terminal 106；

First end of the first build-out resistor 103 is connected with the first terminal 1061 of receiving terminal 106, the second end ground connection；

First end of the second build-out resistor 104 is connected with the second terminal 1062 of receiving terminal 106, the second end ground connection；

First end of the 3rd build-out resistor 105 is connected with the first terminal 1061 of receiving terminal 106, the second end and receiving terminal Second terminal 1062 of 106 is connected；

The internal resistance 107 of receiving terminal 106 is in parallel with the 3rd build-out resistor 105；

Wherein, the first build-out resistor 103 is equal with the resistance of the second build-out resistor 104, the first build-out resistor 103 and second The resistance of build-out resistor 104 meets formula one；

The resistance of resistance unit 108 meets formula two, and the resistance of the 3rd build-out resistor 105 meets formula three.

When described internal resistance is less than or equal to the resistance of described resistance unit, described 3rd build-out resistor is connected on described first Between holding wire and described receiving terminal, or, described 3rd build-out resistor is connected on described secondary signal line and described receiving terminal Between, the resistance of described 3rd build-out resistor meets formula four, and wherein, described formula four is:

R₃=R_z-R₀,

Wherein, R3 is the resistance of described 3rd build-out resistor, R_zFor the resistance of described resistance unit, R₀For described internal resistance.

In the present embodiment, owing to the resistance of internal resistance is less than or equal to the resistance of resistance unit, so needing by the 3rd Distribution resistance is connected with internal resistance and is realized the resistance of resistance unit.In the case of the 3rd build-out resistor is connected with internal resistance, Ke Yitong Cross formula three and determine the resistance of the 3rd build-out resistor.

In the present embodiment, when the resistance of internal resistance is equal to the resistance of resistance unit, the resistance of the 3rd build-out resistor is 0, The coupling to differential impedance can be realized by internal resistance without additionally adding resistance.

As it is shown on figure 3, a kind of signal circuit that the embodiment of the present invention provides, including:

First holding wire 101, secondary signal line the 102, first build-out resistor the 103, second build-out resistor the 104, the 3rd are mated Resistance 105, receiving terminal 106；

First end of the first build-out resistor 103 is connected with the first terminal 1061 of receiving terminal 106, the second end ground connection；

First end of the second build-out resistor 104 is connected with the second terminal 1062 of receiving terminal 106, the second end ground connection；

First end and first holding wire 101 of the 3rd build-out resistor 105 are connected, the other end and the first end of receiving terminal 106 Son 1061 is connected；

The internal resistance 107 of receiving terminal 106 is connected with the 3rd build-out resistor 105；

Wherein, the first build-out resistor 103 is equal with the resistance of the second build-out resistor 104, the first build-out resistor 103 and second The resistance of build-out resistor 104 meets formula one；

The resistance of resistance unit 108 meets formula two, and the resistance of the 3rd build-out resistor 105 meets formula four.

In embodiments of the present invention, the first holding wire and secondary signal line can be a pair differential signal lines, the first signal On line and secondary signal line, transmission can be differential signal.

In embodiments of the present invention, by the first build-out resistor, the second build-out resistor and the 3rd build-out resistor, it is achieved that poor Divide and the requirement of common-mode signal impedance matching simultaneously, reduce signal reflex strength on the transmit path, promotion signal transmission matter Amount, improves high-frequency signal SI (Signal Integrity, the signal integrity) signal quality at receiving terminal.

In embodiments of the present invention, according to pcb board transmission path on differential impedance, common code impedance, formula one, formula two, Formula three and formula four, choose suitable first build-out resistor, the second build-out resistor and the 3rd build-out resistor, with this balanced signal Differential-mode impedance on transmission path and common code impedance, on the P line of receiving terminal and N line of differential signaling path the most over the ground Connect the first build-out resistor and the second build-out resistor, be built into PI type circuit with the resistance unit of the 3rd build-out resistor Yu internal resistance, logical Crossing the PI type circuit of this receiving terminal, improve signal impedance matching relation on the transmit path, balanced differential impedance simultaneously is with common Mould impedance, can effectively promote the pulse amplitude of differential signal, reduces differential mode and the signaling reflex of common mode component in high-frequency signal, carries Rise the signal quality at receiving terminal.

As shown in Figure 4, a kind of of embodiment of the present invention offer promotes the method that receiving terminal receives the quality of signal, bag Include:

Step 401: determine the first holding wire for transmitting signal and the differential impedance of secondary signal line and common code impedance；

Step 402: determine the internal resistance of receiving terminal；

Step 403: determine the first build-out resistor matched with described differential impedance, described common code impedance, second mate The resistance unit that resistance and the 3rd build-out resistor and described internal resistance are constituted；

Step 404: according to described internal resistance and described resistance unit, determines described 3rd build-out resistor；

Step 405: described first holding wire is connected with the first terminal of described receiving terminal；

Step 406: described secondary signal line is connected with the second terminal of described receiving terminal；

Step 407: the first end of described first build-out resistor is connected with described first holding wire, the second end ground connection；

Step 408: the first end of described second build-out resistor is connected with described secondary signal line, the second end ground connection；

Step 409: the first end of described resistance unit is connected with described first holding wire, the second end and described second letter Number line is connected；

Step 410: utilize described first holding wire and described secondary signal line, transfer signals to described receiving terminal.

In an embodiment of the present invention, described first matched with described differential impedance, described common code impedance is determined The resistance unit that distribution resistance, the second build-out resistor and the 3rd build-out resistor and described internal resistance are constituted, including:

According to described common code impedance and formula one, determine described first build-out resistor and the resistance of described second build-out resistor Value, wherein, described formula one is:

R₁=R₂=2Z₁,

Wherein, R₁Resistance, R for described first build-out resistor₂For the resistance of described second build-out resistor, Z₁For described common Mould impedance.

In an embodiment of the present invention, described first matched with described differential impedance, described common code impedance is determined The resistance unit that distribution resistance, the second build-out resistor and the 3rd build-out resistor and described internal resistance are constituted, including:

According to described differential impedance, described common code impedance and formula two, determine the resistance of described resistance unit, wherein, institute Stating formula two is:

$R_z=\frac{4Z_1\×Z_2}{4Z_1-Z_2},$

Wherein, R_zFor the resistance of described resistance unit, Z₁For described common code impedance, Z₂For described differential impedance.

In an embodiment of the present invention, when the resistance of described internal resistance is more than the resistance of described resistance unit,

Described according to described internal resistance with described resistance unit, determine described 3rd build-out resistor, including:

According to described internal resistance, described resistance unit and formula three, determine the resistance of described 3rd build-out resistor, wherein, institute Stating formula three is:

$R_3=\frac{R_z{R}_0}{R_0-R_z},$

Wherein, R₃For the resistance of described 3rd build-out resistor, R_zFor the resistance of described resistance unit, R₀For described internal resistance Resistance；

Described first end of described resistance unit is connected with described first holding wire, the second end and described secondary signal line It is connected, including:

Described first end of the 3rd build-out resistor is connected with the first terminal of described receiving terminal, the second end and described reception Second terminal of end is connected；

When described internal resistance is less than or equal to the resistance of described resistance unit,

Described according to described internal resistance with described resistance unit, determine described 3rd build-out resistor, including:

According to described internal resistance, described resistance unit and formula four, determine the resistance of described 3rd build-out resistor, wherein, institute Stating formula four is:

R₃=R_z-R₀,

Wherein, R₃For the resistance of described 3rd build-out resistor, R_zFor the resistance of described resistance unit, R₀For described internal resistance Resistance；

Described first end of described resistance unit is connected with described first holding wire, the second end and described secondary signal line It is connected, including:

Described 3rd build-out resistor is connected between described first holding wire and described receiving terminal, or,

Described 3rd build-out resistor is connected between described secondary signal line and described receiving terminal.

In an embodiment of the present invention, described by the first end of described first build-out resistor and described first holding wire phase Even, the second end ground connection, including:

First end of described first build-out resistor is connected with the first terminal of described receiving terminal, the second end ground connection.

In an embodiment of the present invention, described by the first end of described second build-out resistor and described secondary signal line phase Even, the second end ground connection, including:

First end of described second build-out resistor is connected with the second terminal of described receiving terminal, the second end ground connection.

In an embodiment of the present invention, the first holding wire for transmitting signal and the differential impedance of secondary signal line are determined And common code impedance, can be realized by following steps:

Determine described first holding wire and the odd mode impedance of described secondary signal line and even mode impedance；

According to odd mode impedance and formula five, determining differential impedance, wherein, formula five is:

Z₂=2Z_d,

Wherein, Z₂For differential impedance, Z_dFor odd mode impedance.

According to even mode impedance and formula six, determining common code impedance, wherein, formula six is:

$Z_1=\frac{Z_c}{2},$

Wherein, Z₁For common code impedance, Z_cFor even mode impedance.

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 and the first holding wire are connected, the second end ground connection, the First end of two build-out resistors is connected with secondary signal line, the second end ground connection, and the 3rd build-out resistor is constituted with the internal resistance of receiving terminal The first end of resistance unit and the first holding wire be connected, the second end is connected with secondary signal line, the first build-out resistor, second Distribution resistance and resistance unit and the first holding wire and the differential impedance of secondary signal line and common code impedance match, by first Distribution resistance, the second build-out resistor and resistance unit, it is achieved differential impedance and the coupling of common code impedance on signal transmission path, reduce Differential mode energy and the reflex strength of common mode energy in signal, and then improve the quality of the signal that receiving terminal receives.

2, in the present embodiment, the first build-out resistor determined by formula one and the second build-out resistor, can be more preferable Coupling common code impedance, it is possible to preferably reduce common-mode noise so that the common-mode noise that the signal that receiving terminal receives is subject to Affect less, improve signal quality.

3, in embodiments of the present invention, the resistance of resistance unit is determined by formula two, can be more by resistance unit Good coupling differential-mode impedance, it is possible to preferably reduce differential mode noise so that the differential mode noise that the signal that receiving terminal receives is subject to Impact less, improve signal quality.

4, in embodiments of the present invention, by the first build-out resistor, the second build-out resistor and the 3rd build-out resistor, it is achieved that The requirement of difference and common-mode signal impedance matching simultaneously, reduces signal reflex strength on the transmit path, and promotion signal transmits Quality, improves the high-frequency signal SI signal quality at receiving terminal.

5, in embodiments of the present invention, according to differential impedance, common code impedance, formula one, formula on pcb board transmission path Two, formula three and formula four, chooses suitable first build-out resistor, the second build-out resistor and the 3rd build-out resistor, balances with this Differential-mode impedance on signal transmission path and common code impedance, on the P line of receiving terminal and N line of differential signaling path respectively Connect the first build-out resistor and the second build-out resistor over the ground, be built into PI type electricity with the resistance unit of the 3rd build-out resistor Yu internal resistance Road, by the PI type circuit of this receiving terminal, improves signal impedance matching relation on the transmit path, balanced differential impedance simultaneously And common code impedance, can effectively promote the pulse amplitude of differential signal, reduce the signal of differential mode and common mode component in high-frequency signal anti- Penetrating, promotion signal is in the quality of receiving terminal.

It should be noted that in this article, the relational terms of such as first and second etc is used merely to an entity Or operation separates with another entity or operating space, and not necessarily require or imply existence between these entities or operation The relation of any this reality or order.And, term " includes ", " comprising " or its any other variant are intended to non- Comprising of exclusiveness, so that include that the process of a series of key element, method, article or equipment not only include those key elements, But also include other key elements being not expressly set out, or also include being consolidated by this process, method, article or equipment Some key elements.In the case of there is no more restriction, statement the key element " including a 〃 " and limiting, do not arrange Except there is also other same factor in including the process of described key element, method, article or equipment.

One of ordinary skill in the art will appreciate that: all or part of step realizing said method embodiment can be passed through The hardware that programmed instruction is relevant completes, and aforesaid program can be stored in the storage medium of embodied on computer readable, this program Upon execution, perform to include the step of said method embodiment；And aforesaid storage medium includes: ROM, RAM, magnetic disc or light In the various medium that can store program code such as dish.

Last it should be understood that the foregoing is only presently preferred embodiments of the present invention, it is merely to illustrate the skill of the present invention Art scheme, is not intended to limit protection scope of the present invention.All made within the spirit and principles in the present invention any amendment, Equivalent, improvement etc., be all contained in protection scope of the present invention.

Claims (10)

1. a signal circuit, it is characterised in that including:

For transmitting the first holding wire and secondary signal line, the first build-out resistor, the second build-out resistor, the 3rd coupling electricity of signal Resistance, receiving terminal；

Described first holding wire is connected with the first terminal of described receiving terminal；

Described secondary signal line is connected with the second terminal of described receiving terminal；

First end of described first build-out resistor is connected with described first holding wire, the second end ground connection；

First end of described second build-out resistor is connected with described secondary signal line, the second end ground connection；

First end of the resistance unit that the internal resistance of described 3rd build-out resistor and described receiving terminal is constituted and described first holding wire Being connected, the second end is connected with described secondary signal line；

Wherein, described first build-out resistor, described second build-out resistor and described resistance unit and described first holding wire and Differential impedance and the common code impedance of described secondary signal line match.

Signal circuit the most according to claim 1, it is characterised in that including:

Described first build-out resistor is equal with the resistance of described second build-out resistor；

The resistance of described first build-out resistor and described second build-out resistor meets formula one, and wherein, formula one is:

R₁=R₂=2Z₁,

Wherein, R₁Resistance, R for described first build-out resistor₂For the resistance of described second build-out resistor, Z₁Hinder for described common mode Anti-.

Signal circuit the most according to claim 1, it is characterised in that including:

The resistance of described resistance unit meets formula two, and wherein, described formula two is:

$R_z=\frac{4Z_1\×Z_2}{4Z_1-Z_2},$

Wherein, R_zFor the resistance of described resistance unit, Z₁For described common code impedance, Z₂For described differential impedance.

Signal circuit the most according to claim 1, it is characterised in that including:

When the resistance of described internal resistance is more than the resistance of described resistance unit, the first end of described 3rd build-out resistor connects with described The first terminal of receiving end is connected, and the second end is connected with the second terminal of described receiving terminal, and the resistance of described 3rd build-out resistor is full Foot formula three, wherein, described formula three is:

$R_3=\frac{R_z{R}_0}{R_0-R_z},$

Wherein, R₃For the resistance of described 3rd build-out resistor, R_zFor the resistance of described resistance unit, R₀For described internal resistance；

When described internal resistance is less than or equal to the resistance of described resistance unit, described 3rd build-out resistor is connected on described first signal Between line and described receiving terminal, or, described 3rd build-out resistor is connected between described secondary signal line and described receiving terminal, The resistance of described 3rd build-out resistor meets formula four, and wherein, described formula four is:

R₃=R_z-R₀,

Wherein, R3 is the resistance of described 3rd build-out resistor, R_zFor the resistance of described resistance unit, R₀For described internal resistance.

5. according to described signal circuit arbitrary in claim 1-4, it is characterised in that including:

First end of described first build-out resistor is connected with the first terminal of described receiving terminal, the second end ground connection；

And/or,

First end of described second build-out resistor is connected with the second terminal of described receiving terminal, the second end ground connection.

6. one kind promotes the method that receiving terminal receives the quality of signal, it is characterised in that

Determine the first holding wire for transmitting signal and the differential impedance of secondary signal line and common code impedance；Determine receiving terminal Internal resistance；Determine the first build-out resistor, the second build-out resistor and the 3rd matched with described differential impedance, described common code impedance The resistance unit that build-out resistor and described internal resistance are constituted；According to described internal resistance and described resistance unit, determine described 3rd coupling Resistance；Described first holding wire is connected with the first terminal of described receiving terminal；By described secondary signal line and described receiving terminal The second terminal be connected；First end of described first build-out resistor is connected with described first holding wire, the second end ground connection；By institute The first end stating the second build-out resistor is connected with described secondary signal line, the second end ground connection；By the first end of described resistance unit Being connected with described first holding wire, the second end is connected with described secondary signal line；Also include:

Utilize described first holding wire and described secondary signal line, transfer signals to described receiving terminal.

Method the most according to claim 6, it is characterised in that

Described determine match with described differential impedance, described common code impedance the first build-out resistor, the second build-out resistor and The resistance unit that 3rd build-out resistor and described internal resistance are constituted, including:

According to described common code impedance and formula one, determine described first build-out resistor and the resistance of described second build-out resistor, its In, described formula one is:

R₁=R₂=2Z₁,

Wherein, R₁Resistance, R for described first build-out resistor₂For the resistance of described second build-out resistor, Z₁Hinder for described common mode Anti-.

Method the most according to claim 6, it is characterised in that described determine and described differential impedance, described common code impedance The resistance unit that the first build-out resistor, the second build-out resistor and the 3rd build-out resistor that match and described internal resistance are constituted, bag Include:

According to described differential impedance, described common code impedance and formula two, determine the resistance of described resistance unit, wherein, described public affairs Formula two is:

$R_z=\frac{4Z_1\×Z_2}{4Z_1-Z_2},$

Wherein, R_zFor the resistance of described resistance unit, Z₁For described common code impedance, Z₂For described differential impedance.

Method the most according to claim 6, it is characterised in that

When the resistance of described internal resistance is more than the resistance of described resistance unit,

Described according to described internal resistance with described resistance unit, determine described 3rd build-out resistor, including:

According to described internal resistance, described resistance unit and formula three, determine the resistance of described 3rd build-out resistor, wherein, described public affairs Formula three is:

$R_3=\frac{R_z{R}_0}{R_0-R_z},$

Wherein, R₃For the resistance of described 3rd build-out resistor, R_zFor the resistance of described resistance unit, R₀Resistance for described internal resistance；

Described first end of described resistance unit is connected with described first holding wire, the second end and described secondary signal line phase Connect, including:

Described first end of the 3rd build-out resistor is connected with the first terminal of described receiving terminal, the second end and described receiving terminal Second terminal is connected；

When described internal resistance is less than or equal to the resistance of described resistance unit,

Described according to described internal resistance with described resistance unit, determine described 3rd build-out resistor, including:

According to described internal resistance, described resistance unit and formula four, determine the resistance of described 3rd build-out resistor, wherein, described public affairs Formula four is:

R₃=R_z-R₀,

Wherein, R₃For the resistance of described 3rd build-out resistor, R_zFor the resistance of described resistance unit, R₀Resistance for described internal resistance；

Described first end of described resistance unit is connected with described first holding wire, the second end and described secondary signal line phase Connect, including:

Described 3rd build-out resistor is connected between described first holding wire and described receiving terminal, or,

Described 3rd build-out resistor is connected between described secondary signal line and described receiving terminal.

10. according to described method arbitrary in claim 6-9, it is characterised in that

Described first end of described first build-out resistor is connected with described first holding wire, the second end ground connection, including:

First end of described first build-out resistor is connected with the first terminal of described receiving terminal, the second end ground connection；

And/or,

Described first end of described second build-out resistor is connected with described secondary signal line, the second end ground connection, including:

First end of described second build-out resistor is connected with the second terminal of described receiving terminal, the second end ground connection.