CN110166384B - Differential signal transmission circuit and communication device - Google Patents
Differential signal transmission circuit and communication device Download PDFInfo
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- CN110166384B CN110166384B CN201910451688.8A CN201910451688A CN110166384B CN 110166384 B CN110166384 B CN 110166384B CN 201910451688 A CN201910451688 A CN 201910451688A CN 110166384 B CN110166384 B CN 110166384B
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- 230000008054 signal transmission Effects 0.000 title claims abstract description 50
- 238000004891 communication Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 abstract description 16
- 230000008569 process Effects 0.000 abstract description 10
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 230000009471 action Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/68—Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0264—Arrangements for coupling to transmission lines
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0264—Arrangements for coupling to transmission lines
- H04L25/0272—Arrangements for coupling to multiple lines, e.g. for differential transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0264—Arrangements for coupling to transmission lines
- H04L25/0292—Arrangements specific to the receiver end
Abstract
The invention discloses a differential signal transmission circuit, which is based on the existing positive signal input circuit and negative signal input circuit, and also comprises a variable resistor arranged between a first voltage-dividing resistor of the positive signal input circuit and a second voltage-dividing resistor of the negative signal input circuit, and is used for adjusting the amplitude of a differential signal. In a traditional two-way signal transmission circuit, two variable resistors are needed for adjusting two single-ended signals, however, a differential signal has the characteristic that after a positive signal and a negative signal are added, the signal is zero and absolute value voltage division is taken, one variable resistor is not needed to be used for adjustment, only one variable resistor is used for adjusting two-way signals simultaneously, and the same amplitude adjustment effect can be obtained. Therefore, the process of pairing the two variable resistors is omitted, the adjustment is convenient, and the symmetric distortion condition of phase or potential deviation caused by asymmetry of positive and negative signals in the adjustment process is avoided. The invention also provides a communication device with the beneficial effects.
Description
Technical Field
The present invention relates to electronic circuits, and more particularly to a differential signal transmission circuit and a communication device.
Background
Differential transmission is a signal transmission technology, and is different from the traditional method of one signal wire and one ground wire, wherein the differential transmission transmits signals on the two wires, and the two signals have the same amplitude and opposite phases. The signals transmitted on these two wires are differential signals. The signal receiving end compares the difference value of the two voltages to judge the logic state sent by the sending end. On a circuit board, the differential traces must be two lines that are equal in length, equal in width, closely adjacent, and on the same plane. The differential signal plays a very important role in signal transmission, and no matter high power broadcasting, high-frequency signals such as PCIE and SATA of high-speed signals, the differential signal must be used to transmit noise-resistant signals.
In the prior art, the amplitude of the differential signal is adjusted in a conventional manner, i.e., the differential signal is regarded as two sets of single-ended signals, which are respectively implemented in a voltage division manner. Fig. 1 is a circuit diagram of a differential signal transmission circuit in the prior art. As shown in fig. 1, the differential signal transmission circuit in the prior art includes a positive signal input circuit, a negative signal input circuit, a first variable resistor R1 and a second variable resistor R2; the positive signal input circuit comprises a first operational amplifier A1 and a first voltage-dividing resistor R3, the negative signal input circuit comprises a second operational amplifier A2 and a second voltage-dividing resistor R4, the output end of the first operational amplifier A1 is connected with the first end of the first voltage-dividing resistor R3, the output end of the second operational amplifier A2 is connected with the first end of the second voltage-dividing resistor R4, the first end of the first variable resistor R1 is connected with the second end of the first voltage-dividing resistor R3, the first end of the second variable resistor R2 is connected with the second end of the second voltage-dividing resistor R4, and the second end of the first variable resistor R1 and the second end of the second variable resistor R2 are connected to the ground. The positive signal and the negative signal in the differential signal are respectively input from the input terminal of the first operational amplifier a1 and the input terminal of the second operational amplifier a2, and after the resistances of the first variable resistor R1 and the second variable resistor R2 are changed synchronously, the amplitude changes of the positive signal and the negative signal are obtained by the voltage division of the first voltage dividing resistor R3 and the second voltage dividing resistor R4 respectively.
It can be seen that, in the existing differential signal transmission circuit, since the positive signal and the negative signal are respectively amplitude-adjusted by using one variable resistor, in order to ensure the consistency of the two signals, the two variable resistors need to be paired, and the requirement on the pairing precision is very high, which is not beneficial to adjusting the amplitude of the differential signal, and also can cause the problem of symmetric distortion in the adjustment process.
It is a technical problem to be solved by those skilled in the art to provide a differential signal transmission circuit that facilitates adjusting the amplitude of a differential signal.
Disclosure of Invention
The present invention provides a differential signal transmission circuit and a communication device, which facilitate the adjustment of the amplitude of differential signals.
To solve the above technical problem, the present invention provides a differential signal transmission circuit, which includes a positive signal input circuit, a negative signal input circuit, and a variable resistor;
the positive signal input circuit comprises a first operational amplifier and a first voltage-dividing resistor, wherein the output end of the first operational amplifier is connected with the first end of the first voltage-dividing resistor, the input end of the first operational amplifier is used for receiving a positive signal of a differential signal, and the first voltage-dividing resistor is used for outputting an amplified positive signal;
the negative signal input circuit comprises a second operational amplifier and a second voltage-dividing resistor, wherein the output end of the second operational amplifier is connected with the first end of the second voltage-dividing resistor, the input end of the second operational amplifier is used for receiving a negative signal of the differential signal, and the second voltage-dividing resistor is used for outputting an amplified negative signal;
the first end of the variable resistor is connected with the second end of the first divider resistor, and the second end of the variable resistor is connected with the second end of the second divider resistor.
Optionally, the device further comprises a controller connected to the variable resistor and an input device connected to the controller;
correspondingly, the variable resistor is specifically an electrically controlled rheostat, and the controller adjusts the resistance value of the electrically controlled rheostat according to a resistance instruction input by the input device.
Optionally, the input device is specifically a key circuit.
Optionally, the variable resistor is specifically a potentiometer.
Optionally, the variable resistor specifically includes a coarse tuning resistor circuit and a fine tuning resistor circuit.
Optionally, the display device is connected with the variable resistor and used for displaying the resistance value of the variable resistor.
Optionally, the system further comprises a common mode filter;
the common mode filter includes a first differential filter connected to an input of the first operational amplifier and a second differential filter connected to an input of the second operational amplifier.
Optionally, the first differential filter and the second differential filter are both first-order filters.
To solve the above technical problem, the present invention further provides a communication device including the differential signal transmission circuit described in any one of the above.
The differential signal transmission circuit provided by the invention is based on the existing positive signal input circuit and negative signal input circuit, and also comprises a variable resistor arranged between a first voltage-dividing resistor of the positive signal input circuit and a second voltage-dividing resistor of the negative signal input circuit, and the variable resistor is used for adjusting the amplitude of the differential signal. In a traditional two-way signal transmission circuit, two variable resistors are needed for adjusting two single-ended signals, however, a differential signal has the characteristic that after a positive signal and a negative signal are added, the signal is zero and absolute value voltage division is taken, one variable resistor is not needed to be used for adjustment, only one variable resistor is used for adjusting two-way signals simultaneously, and the same amplitude adjustment effect can be obtained. The scheme of one variable resistor replaces two variable resistors, and the process of pairing the two variable resistors is omitted during use, so that the adjustment is convenient, and the symmetric distortion condition of phase or potential offset generated by asymmetry of positive and negative signals in the adjustment process is avoided. The invention also provides a communication device, which has the beneficial effects and is not described herein again.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a circuit diagram of a differential signal transmission circuit in the prior art;
FIG. 2 is a circuit diagram of a differential signal transmission circuit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of another differential signal transmission circuit according to an embodiment of the present invention.
Detailed Description
The core of the present invention is to provide a differential signal transmission circuit and a communication device, which are convenient for adjusting the amplitude of the differential signal.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 2 is a circuit diagram of a differential signal transmission circuit according to an embodiment of the present invention.
As shown in fig. 2, the differential signal transmission circuit according to the embodiment of the present invention includes a positive signal input circuit, a negative signal input circuit, and a variable resistor R5;
the positive signal input circuit comprises a first operational amplifier A1 and a first voltage-dividing resistor R3, wherein the output end of the first operational amplifier A1 is connected with the first end of the first voltage-dividing resistor R3, the input end of the first operational amplifier A1 is used for receiving a positive signal of a differential signal, and the first voltage-dividing resistor R3 is used for outputting an amplified positive signal;
the negative signal input circuit comprises a second operational amplifier A2 and a second voltage-dividing resistor R4, wherein the output end of the second operational amplifier A2 is connected with the first end of the second voltage-dividing resistor R4, the input end of the second operational amplifier A2 is used for receiving a negative signal of the differential signal, and the second voltage-dividing resistor R4 is used for outputting the amplified negative signal;
a first terminal of the variable resistor R5 is connected to a second terminal of the first voltage-dividing resistor R3, and a second terminal of the variable resistor R5 is connected to a second terminal of the second voltage-dividing resistor R4.
In a specific implementation, the first operational amplifier a1, the first voltage-dividing resistor R3, the second operational amplifier a2, the second voltage-dividing resistor R4 and the variable resistor R5 may all be conventional elements, and the type of each element, such as amplification factor, resistance value, etc., is selected according to the application. As is more common, the variable resistor R5 may be a potentiometer.
In order to facilitate fine adjustment of the variable resistor R5, the differential signal transmission circuit may further include a controller connected to the variable resistor R5 and an input device connected to the controller;
correspondingly, the variable resistor R5 is embodied as an electrically controlled rheostat, and the controller adjusts the resistance value of the electrically controlled rheostat according to a resistance command input by the input device.
In a precise integrated circuit, a plurality of differential signal transmission circuits are often required to be arranged, and the volume of an electronic element is more and more miniaturized, so that in order to facilitate integration control, the variable resistor R5 in the differential signal transmission circuit is selected as an electric control rheostat and is uniformly controlled by a controller. Meanwhile, in order to facilitate user operation, an input device is arranged for receiving the resistance instruction. The input device may be a key circuit.
In order to further improve the adjustment accuracy and the adjustment speed, the variable resistor R5 may specifically include a coarse resistor circuit and a fine resistor circuit.
Optionally, in order to facilitate the user to obtain the intermediate value for calculation, the differential signal transmission circuit may further include a display connected to the variable resistor R5 for displaying the resistance value of the variable resistor R5. The display can adopt an LCD display screen and is simultaneously connected with the variable resistors R5 of the plurality of differential signal transmission circuits for uniformly displaying the resistance value.
The differential signal transmission circuit provided by the embodiment of the invention further comprises a variable resistor arranged between the first voltage-dividing resistor of the positive signal input circuit and the second voltage-dividing resistor of the negative signal input circuit on the basis of the conventional positive signal input circuit and negative signal input circuit, and the variable resistor is used for adjusting the amplitude of the differential signal. In a traditional two-way signal transmission circuit, two variable resistors are needed for adjusting two single-ended signals, however, a differential signal has the characteristic that after a positive signal and a negative signal are added, the signal is zero and absolute value voltage division is taken, one variable resistor is not needed to be used for adjustment, only one variable resistor is used for adjusting two-way signals simultaneously, and the same amplitude adjustment effect can be obtained. The scheme of one variable resistor replaces two variable resistors, and the process of pairing the two variable resistors is omitted during use, so that the adjustment is convenient, and the symmetric distortion condition of phase or potential offset generated by asymmetry of positive and negative signals in the adjustment process is avoided.
Fig. 3 is a circuit diagram of another differential signal transmission circuit according to an embodiment of the present invention.
As shown in fig. 3, based on the above embodiment, in another embodiment, the differential signal transmission circuit further includes a common mode filter;
the common mode filter includes a first differential filter L1 connected to an input of the first operational amplifier a1 and a second differential filter L2 connected to an input of the second operational amplifier a 2.
Although the differential signal has the characteristic of preventing common mode interference, the impedance of the high-speed digital differential signal is difficult to maintain constant throughout the actual transmission process, for example, impedance discontinuity is caused by avoiding the via and impedance discontinuity caused by the via and the connector, and therefore, noise must be further suppressed by other means. The common mode filter is added at the input end of the operational amplifier, so that the common mode interference can be further inhibited, and the signal transmission quality is improved.
For cost reasons, the first differential filter L1 and the second differential filter L2 may each be a first order filter, which is connected as shown in fig. 3. The first order filter uses a reactive element to store energy in a certain frequency band while it does not transfer energy to the load. In the case of a low-pass common mode filter, the reactive element used is a common mode choke. Care should be taken in selecting a choke for a first order low pass filter because selecting a value much larger than a typical or minimum inductance value limits the effective attenuation band of the choke.
The first and second differential filters L1 and L2 may also employ a second order filter using two reactive elements or a third order filter using three reactive elements when a higher accuracy signal is required.
On the basis of the above detailed description of the various embodiments corresponding to the differential signal transmission circuit, the present invention also discloses a communication device including the differential signal transmission circuit. The communication device comprises the differential signal transmission circuit according to any one of the above embodiments.
It is understood that the differential signal transmission circuit provided by the embodiments of the present invention is applicable to all devices requiring differential signal transmission.
Since the embodiment of the communication device portion corresponds to the embodiment of the differential signal transmission circuit portion, please refer to the description of the embodiment of the differential signal transmission circuit portion for the embodiment of the communication device portion, which is not repeated herein.
In the embodiments provided in the present application, it should be understood that the disclosed differential signal transmission circuit and communication device may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of modules is merely a division of logical functions, and an actual implementation may have another division, for example, a plurality of modules or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or modules, and may be in an electrical, mechanical or other form.
In addition, functional modules in the embodiments of the present application may be integrated into one processing module, or each of the modules may exist alone physically, or two or more modules are integrated into one module.
The differential signal transmission circuit and the communication device provided by the present invention are described in detail above. The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (7)
1. A differential signal transmission circuit is characterized by comprising a positive signal input circuit, a negative signal input circuit, a variable resistor, a controller connected with the variable resistor and an input device connected with the controller;
the positive signal input circuit comprises a first operational amplifier and a first voltage-dividing resistor, wherein the output end of the first operational amplifier is connected with the first end of the first voltage-dividing resistor, the input end of the first operational amplifier is used for receiving a positive signal of a differential signal, and the first voltage-dividing resistor is used for outputting an amplified positive signal;
the negative signal input circuit comprises a second operational amplifier and a second voltage-dividing resistor, wherein the output end of the second operational amplifier is connected with the first end of the second voltage-dividing resistor, the input end of the second operational amplifier is used for receiving a negative signal of the differential signal, and the second voltage-dividing resistor is used for outputting an amplified negative signal;
a first end of the variable resistor is connected with a second end of the first divider resistor, and a second end of the variable resistor is connected with a second end of the second divider resistor;
the variable resistor is specifically an electrically controlled rheostat, and the controller adjusts the resistance value of the electrically controlled rheostat according to a resistance instruction input by the input device so as to adjust the amplitude of the positive signal and the amplitude of the negative signal; the controller is connected with the variable resistors in the differential signal transmission circuits;
the display is connected with the variable resistors and used for displaying the resistance values of the variable resistors, and the display is connected with the variable resistors in the differential signal transmission circuits.
2. The differential signal transmission circuit according to claim 1, wherein the input device is a key circuit.
3. The differential signal transmission circuit according to claim 1, wherein the variable resistor is a potentiometer.
4. The differential signal transmission circuit according to claim 1, wherein the variable resistor includes a coarse resistor circuit and a fine resistor circuit.
5. The differential signal transmission circuit according to claim 1, further comprising a common mode filter;
the common mode filter includes a first differential filter connected to an input of the first operational amplifier and a second differential filter connected to an input of the second operational amplifier.
6. The differential signal transmission circuit of claim 5, wherein the first differential filter and the second differential filter are first order filters.
7. A communication apparatus comprising the differential signal transmission circuit according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910451688.8A CN110166384B (en) | 2019-05-28 | 2019-05-28 | Differential signal transmission circuit and communication device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910451688.8A CN110166384B (en) | 2019-05-28 | 2019-05-28 | Differential signal transmission circuit and communication device |
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| CN110166384A CN110166384A (en) | 2019-08-23 |
| CN110166384B true CN110166384B (en) | 2022-02-18 |
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| CN111521925B (en) * | 2020-04-30 | 2022-09-16 | 西安微电子技术研究所 | System level test system and method for 4M 1553 bus transceiver |
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| CN101242162A (en) * | 2007-02-08 | 2008-08-13 | 联发科技（新加坡）私人有限公司 | Variable gain amplifying circuit |
| CN104410377A (en) * | 2014-12-12 | 2015-03-11 | 长沙景嘉微电子股份有限公司 | Fully differential amplifier output common mode imbalance correcting circuit |
| JP5759644B1 (en) * | 2015-01-30 | 2015-08-05 | ソニックス株式会社 | Differential amplifier circuit |
| CN107070424A (en) * | 2017-03-10 | 2017-08-18 | 天津工业大学 | A kind of pre-amplification circuit of pulse signal process chip |
| CN206585535U (en) * | 2017-03-10 | 2017-10-24 | 天津工业大学 | A kind of pre-amplification circuit of pulse signal process chip |
| CN207490897U (en) * | 2016-11-08 | 2018-06-12 | 意法半导体公司 | Voltage driver circuits |
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2019
- 2019-05-28 CN CN201910451688.8A patent/CN110166384B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101242162A (en) * | 2007-02-08 | 2008-08-13 | 联发科技（新加坡）私人有限公司 | Variable gain amplifying circuit |
| CN104410377A (en) * | 2014-12-12 | 2015-03-11 | 长沙景嘉微电子股份有限公司 | Fully differential amplifier output common mode imbalance correcting circuit |
| JP5759644B1 (en) * | 2015-01-30 | 2015-08-05 | ソニックス株式会社 | Differential amplifier circuit |
| CN207490897U (en) * | 2016-11-08 | 2018-06-12 | 意法半导体公司 | Voltage driver circuits |
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