CN103441973B - A kind of differential signal suppresses compensation method, apparatus and system - Google Patents
A kind of differential signal suppresses compensation method, apparatus and system Download PDFInfo
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- CN103441973B CN103441973B CN201310412717.2A CN201310412717A CN103441973B CN 103441973 B CN103441973 B CN 103441973B CN 201310412717 A CN201310412717 A CN 201310412717A CN 103441973 B CN103441973 B CN 103441973B
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Abstract
Suppress compensation method, apparatus and system the embodiment of the invention discloses a kind of differential signal, wherein method is particular by real-time a pair of differential signals for obtaining receiving terminal input port；Low-pass filtering treatment is done to the pair of differential signal, a pair of DC deviation signals are obtained；Processing is amplified to the pair of DC deviation signal, a pair of direct current compensation signals are obtained；A pair of differential signals for obtaining receiving terminal delivery outlet in real time are compensated using the pair of direct current compensation signal.No matter it can be seen that differential signal deviation of the invention is due to that what reason is caused, differential signal can be detected and occur deviation and carry out suppression compensation to differential signal in real time, the performance of receiving terminal is improved.
Description
Technical field
The present invention relates to electronic technology field, more particularly to a kind of differential signal suppresses compensation method, apparatus and system.
Background technology
In order to improve data transmission bauds, reduction electromagnetic radiation and anti-interference, chip or data among systems transmission
Usually by the way of differential signal, flank speed reaches 10Gb/s.In actual applications, using the system of differential signal transmission
In transmitting terminal, receiving terminal, be produced as error during PCB productions, cause the signal of differential pair to be affected generation deviation,
One of signal of differential pair can be damaged under serious conditions, cause no signal to export, and the differential signal safety of receiving terminal is not
Meet the specification of differential signal, cause receiving circuit can not carry out correct sampling output correct data.
The suppression compensation method used at present is：It is complete before chip dispatches from the factory or when the later stage is to direct current difference deviation calibration
The determination of paired deviation voltage amplitude.Particular by the Differential Input terminal shortcircuit that will normally input so that have in actually entering
The amplitude for imitating signal is zero, the amplitude of regulation compensation differential input end, until the polarity hair of the output data of whole reception system
Untill raw upset, the differential voltage amplitude of compensation then is fixed on into this causes polarity upset numerically, in normal work
When pass through this compensation differential voltage carry out differential signal compensation.But, this suppression compensation method can only suppress compensation and receive
Difference caused by the mismatch of device in circuit, that is, difference caused by receiving terminal circuit hardware can only be compensated, and can not be right
The difference of total system is compensated.Due in actual applications, because circuit ambient voltage, electric current, temperature etc. change all right
Differential signal, which produces influence, causes variation, or also can produce influence to differential signal when transmitting terminal output difference signal is initial
Phenomenon it is commonplace, and at present it is this suppression compensation method it can not be suppressed.
The content of the invention
In order to solve the above-mentioned technical problem, a kind of differential signal is provided in the embodiment of the present invention and suppresses compensation method, dress
Put and system, by carrying out low-pass filtering treatment respectively to the differential signal of input in real time, the direct current in differential pair signal
Signal is filtered out, and this direct current differential signal is exactly DC deviation signal, and differential signal is carried out in real time using the signal
Compensation deals, are caused no matter what reason is this processing mode differential signal deviation be due to, can detect difference letter
Number occur deviation and in real time to differential signal carry out suppression compensation, improve receiving terminal performance.
Suppress compensation method the invention provides a kind of differential signal, including：
A pair of differential signals of receiving terminal input port are obtained in real time；
Low-pass filtering treatment is done to the pair of differential signal, a pair of DC deviation signals are obtained；
Processing is amplified to the pair of DC deviation signal, a pair of direct current compensation signals are obtained；
A pair of differential signals for obtaining receiving terminal delivery outlet in real time are compensated using the pair of direct current compensation signal.
It is preferred that, it is described that processing is amplified to the pair of DC deviation signal, a pair of direct current compensation signals are obtained, are had
Body is amplified processing using sentencing signal to a pair of direct currents with receiving terminal identical reception amplifier.
It is preferred that, the low-pass filtering treatment of being done to the pair of differential signal obtains a pair of DC deviation signals, specifically
Handled using low pass filter.
It is preferred that, it is described that a pair of difference for obtaining receiving terminal delivery outlet in real time are believed using the pair of direct current compensation signal
Number compensate, be specifically that a pair of differential signals of the receiving terminal delivery outlet obtained in real time are subtracted into corresponding a pair of DC compensations
Signal, the output signal after being compensated.
Suppress compensation device present invention also offers a kind of differential signal, including：
Acquiring unit, a pair of differential signals for obtaining receiving terminal input port in real time；
Filter unit, for doing low-pass filtering treatment to the pair of differential signal, obtains a pair of DC deviation signals；
Amplifying unit, for being amplified processing to the pair of DC deviation signal, obtains a pair of direct current compensation signals；
Compensating unit, for utilizing a pair of difference of the pair of direct current compensation signal to acquisition receiving terminal delivery outlet in real time
Signal is compensated.
It is preferred that, the amplifying unit is used sentences signal progress to a pair of direct currents with receiving terminal identical reception amplifier
Enhanced processing.
It is preferred that, the filter unit is handled using low pass filter.
It is preferred that, it is specifically by a pair of the receiving terminal delivery outlet obtained in real time using subtracter that the compensating unit, which is used,
Differential signal subtracts corresponding a pair of direct current compensation signals, the output signal after being compensated.
Suppress compensation system present invention also offers a kind of differential signal, including：
Receiving terminal amplifier, low pass filter and suppression compensation amplifier；
The receiving terminal amplifier input port is connected with the input port of low pass filter, the output of the low pass filter
Mouth is connected with suppressing the input port of compensation amplifier, and the receiving terminal amplifier delivery outlet suppresses to compensate amplifier with described
Delivery outlet is connected；
The receiving terminal amplifier, its progress of a pair of the Difference signal pairs sent for real-time reception differential signal transmitting terminal
Enhanced processing is simultaneously exported；
The low pass filter, for being carried out to a pair of differential signals received by the receiving terminal amplifier input port
Filtering process, and the signal after processing is sent to the suppression compensation amplifier；
It is described to suppress compensation amplifier, obtain a pair of DC compensation letters for being amplified processing to the signal received
Number, a pair of differential signals are exported to the receiving terminal amplifier and compensate processing.
It is preferred that, including：
It is described to suppress the amplifier that compensation amplifier uses same type with the receiving terminal amplifier.
As can be seen from the above-described embodiment, a kind of differential signal is provided in the embodiment of the present invention and suppresses compensation method, dress
Put and system, by a pair of differential signals for obtaining receiving terminal input port in real time；LPF is done to the pair of differential signal
Processing, obtains a pair of DC deviation signals；Processing is amplified to the pair of DC deviation signal, a pair of DC compensations are obtained
Signal；A pair of differential signals for obtaining receiving terminal delivery outlet in real time are compensated using the pair of direct current compensation signal.It is logical
Low-pass filtering treatment is carried out respectively to the differential signal of input after in real time, the direct current signal in differential pair signal is filtered out
Come, this direct current differential signal is exactly DC deviation signal, and processing is compensated to differential signal in real time using the signal, this
No matter kind of a processing mode differential signal deviation is due to that what reason is caused, differential signal can be detected and occur deviation simultaneously
And suppression compensation is carried out to differential signal in real time, improve the performance of receiving terminal.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
To obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is the method flow diagram that a kind of differential signal that the embodiment of the present application one is disclosed suppresses compensation method；
Fig. 2 is the structural representation that a kind of differential signal that the embodiment of the present application two is disclosed suppresses compensation device；
Fig. 3 is the structural representation that a kind of differential signal that the embodiment of the present application three is disclosed suppresses compensation system.
Embodiment
In order to facilitate the understanding of the purposes, features and advantages of the present invention, below in conjunction with the accompanying drawings to the present invention
Embodiment is described in detail.
Embodiment one
Referring to Fig. 1, it, which is a kind of differential signal of the announcement of the embodiment of the present application one, suppresses the method flow of compensation method
Figure, this method comprises the following steps：
Step 101：A pair of differential signals of receiving terminal input port are obtained in real time；
For the normal system using differential signal, including differential signal transmitting terminal and differential signal receiving terminal, wherein,
The effect of differential signal receiving terminal is specifically that a pair of the differential signals received are amplified after processing to export a pair of difference letters
Number.And the signal that receiving terminal input port is received is exactly a pair of the differential signals sent from transmitting terminal.
Step 102：Low-pass filtering treatment is done to the pair of differential signal, a pair of DC deviation signals are obtained；
LPF is a kind of filter type, and low frequency signal can be normal through, and more than the high-frequency signal of setting critical value
Then it is blocked, weakens.But barrier, the amplitude of decrease can then change according to different frequencies and different filters.
High frequency is also designated as sometimes removes filtering or highest removal filtering.
It is preferred that, the low-pass filtering treatment of being done to the pair of differential signal obtains a pair of DC deviation signals, specifically
Handled using low pass filter.
Step 103：Processing is amplified to the pair of DC deviation signal, a pair of direct current compensation signals are obtained；
Because receiving terminal amplifier can be amplified processing to a pair of the differential signals received and then export again, therefore need
A pair of the DC deviation signals to be obtained to low-pass filtering treatment are amplified processing, obtain a pair of direct current compensation signals, this is put
General goal ought to be somebody's turn to do identical with the enhanced processing gain of receiving terminal amplifier.
It is preferred that, it is described that processing is amplified to the pair of DC deviation signal, a pair of direct current compensation signals are obtained, are had
Body is amplified processing using sentencing signal to a pair of direct currents with receiving terminal identical reception amplifier.
Step 104：Utilize a pair of differential signals of the pair of direct current compensation signal to acquisition receiving terminal delivery outlet in real time
Compensate.
It is preferred that, step 104 specifically subtracts a pair of differential signals of the receiving terminal delivery outlet obtained in real time corresponding
A pair of direct current compensation signals, the output signal after being compensated.
By above-described embodiment it can be seen that：A kind of differential signal that the present invention is provided suppresses compensation method, by real-time
Obtain a pair of differential signals of receiving terminal input port；Low-pass filtering treatment is done to the pair of differential signal, a pair of direct currents are obtained
Deviation signal；Processing is amplified to the pair of DC deviation signal, a pair of direct current compensation signals are obtained；Using the pair of
Direct current compensation signal is compensated to a pair of differential signals for obtaining receiving terminal delivery outlet in real time.By in real time to the difference of input
Sub-signal carries out low-pass filtering treatment respectively, and the direct current signal in differential pair signal is filtered out, this direct current differential signal
It is exactly DC deviation signal, processing is compensated to differential signal in real time using the signal, no matter this processing mode difference
Deviation of signal is due to that what reason is caused, and can detect differential signal and occur deviation and in real time to differential signal
Suppression compensation is carried out, the performance of receiving terminal is improved.
Embodiment two
Method in correspondence above-described embodiment one, suppresses compensation device present invention also offers a kind of differential signal, please join
The structural representation shown in Fig. 2 is read, the device includes：Acquiring unit 201, filter unit 202, amplifying unit 203, compensating unit
204.Its internal structure and its annexation are further described with reference to the operation principle of the device.
Acquiring unit 201, a pair of differential signals for obtaining receiving terminal input port in real time；
Filter unit 202, for doing low-pass filtering treatment to the pair of differential signal, obtains a pair of DC deviation letters
Number；
Amplifying unit 203, for being amplified processing to the pair of DC deviation signal, obtains a pair of DC compensation letters
Number；
Compensating unit 204, for utilizing the pair of direct current compensation signal to real-time obtain receiving terminal delivery outlet a pair
Differential signal is compensated.
It is preferred that, the amplifying unit is used sentences signal progress to a pair of direct currents with receiving terminal identical reception amplifier
Enhanced processing.
It is preferred that, the filter unit is handled using low pass filter.
It is preferred that, it is specifically by a pair of the receiving terminal delivery outlet obtained in real time using subtracter that the compensating unit, which is used,
Differential signal subtracts corresponding a pair of direct current compensation signals, the output signal after being compensated.
By above-described embodiment it can be seen that：A kind of differential signal that the present invention is provided suppresses compensation device, passes through four
Unit realizes following functions respectively, by a pair of differential signals for obtaining receiving terminal input port in real time；The pair of difference is believed
Number low-pass filtering treatment is done, obtain a pair of DC deviation signals；Processing is amplified to the pair of DC deviation signal, obtained
A pair of direct current compensation signals；Utilize a pair of differential signals of the pair of direct current compensation signal to acquisition receiving terminal delivery outlet in real time
Compensate.The device by carrying out low-pass filtering treatment respectively to the differential signal of input in real time, in differential pair signal
Direct current signal filter out, this direct current differential signal is exactly DC deviation signal, using the signal in real time to difference believe
Number processing is compensated, cause, can detect no matter what reason is this processing mode differential signal deviation be due to
Differential signal occurs deviation and carries out suppression compensation to differential signal in real time, improves the performance of receiving terminal.
Embodiment three
Referring to Fig. 3, it, which is a kind of differential signal of the announcement of the embodiment of the present application one, suppresses the structural representation of compensation system
Figure, the system includes：Receiving terminal amplifier 301, low pass filter 302 and suppression compensation amplifier 303；
The receiving terminal amplifier input port is connected with the input port of low pass filter, the output of the low pass filter
Mouth is connected with suppressing the input port of compensation amplifier, and the receiving terminal amplifier delivery outlet suppresses to compensate amplifier with described
Delivery outlet is connected；
The receiving terminal amplifier 301, a pair of the Difference signal pairs sent for real-time reception differential signal transmitting terminal its
It is amplified and handles and export；
The low pass filter 302, for a pair of differential signals received by the receiving terminal amplifier input port
Processing 303 is filtered, and the signal after processing is sent to the suppression compensation amplifier；
It is described to suppress compensation amplifier, obtain a pair of DC compensation letters for being amplified processing to the signal received
Number, a pair of differential signals are exported to the receiving terminal amplifier and compensate processing.
It is preferred that, it is described to suppress the amplifier that compensation amplifier uses same type with the receiving terminal amplifier.
By above-described embodiment it can be seen that：A kind of differential signal that the present invention is provided suppresses compensation system, wherein receiving
End amplifier is used for a pair of Difference signal pairs sending of real-time reception differential signal transmitting terminal, and it is amplified and handles and export；It is low
Bandpass filter is used to be filtered a pair of differential signals received by the receiving terminal amplifier input port processing, and will place
Signal after reason, which is sent to described, suppresses compensation amplifier；Suppressing compensation amplifier is used to be amplified place to the signal received
Reason obtains a pair of direct current compensation signals, and exporting a pair of differential signals to the receiving terminal amplifier compensates processing.The system
By carrying out low-pass filtering treatment respectively to the differential signal of input in real time, the direct current signal in differential pair signal is filtered out
Come, this direct current differential signal is exactly DC deviation signal, the signal is amplified using suppression compensation amplifier and handled
To a pair of direct current compensation signals, the signal compensates processing to differential signal in real time, no matter this processing mode difference is believed
Number deviation is due to that what reason is caused, and can detect differential signal and occur deviation and differential signal is entered in real time
Row suppresses compensation, improves the performance of receiving terminal.
It should be noted that one of ordinary skill in the art will appreciate that realizing the whole in above-described embodiment method or portion
Split flow, can be by computer program to instruct the hardware of correlation to complete, described program can be stored in computer can
Read in storage medium, the program is upon execution, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, it is described to deposit
Storage media can be magnetic disc, CD, read-only memory（Read-Only Memory, ROM）Or random access memory
（Random Access Memory, RAM）Deng.
Compensation method, apparatus and system are suppressed to a kind of differential signal provided by the present invention above and carried out detailed Jie
Continue, specific embodiment used herein is set forth to the principle and embodiment of the present invention, the explanation of above example
It is only intended to the method and its core concept for helping to understand the present invention；Simultaneously for those of ordinary skill in the art, according to this
The thought of invention, be will change in specific embodiments and applications, in summary, and this specification content should not
It is interpreted as limitation of the present invention.
Claims (8)
1. a kind of differential signal suppresses compensation method, it is characterised in that including：
A pair of differential signals of receiving terminal input port are obtained in real time；
Low-pass filtering treatment is done to the pair of differential signal, a pair of DC deviation signals are obtained；
Processing is amplified to the pair of DC deviation signal, a pair of direct current compensation signals are obtained, the enhanced processing is with connecing
The enhanced processing gain of receiving end amplifier is identical；
A pair of differential signals of the receiving terminal delivery outlet obtained in real time are subtracted into corresponding a pair of direct current compensation signals, are compensated
Output signal afterwards.
2. according to the method described in claim 1, it is characterised in that described that place is amplified to the pair of DC deviation signal
Reason, obtains a pair of direct current compensation signals, specific to use to enter a pair of DC deviation signals with receiving terminal identical reception amplifier
Row enhanced processing.
3. according to the method described in claim 1, it is characterised in that described that low-pass filtering treatment is done to the pair of differential signal
A pair of DC deviation signals are obtained, it is specific to be handled using low pass filter.
4. a kind of differential signal suppresses compensation device, it is characterised in that including：
Acquiring unit, a pair of differential signals for obtaining receiving terminal input port in real time；
Filter unit, for doing low-pass filtering treatment to the pair of differential signal, obtains a pair of DC deviation signals；
Amplifying unit, for being amplified processing to the pair of DC deviation signal, obtains a pair of direct current compensation signals, described
Enhanced processing is identical with the enhanced processing gain of receiving terminal amplifier；
Compensating unit, for a pair of differential signals of the receiving terminal delivery outlet obtained in real time to be subtracted into corresponding one using subtracter
To direct current compensation signal, the output signal after being compensated.
5. device according to claim 4, it is characterised in that the amplifying unit is used to receive with receiving terminal identical and put
Big device is amplified processing to a pair of DC deviation signals.
6. device according to claim 4, it is characterised in that the filter unit is handled using low pass filter.
7. a kind of differential signal suppresses compensation system, it is characterised in that including：
Receiving terminal amplifier, low pass filter and suppression compensation amplifier；
The receiving terminal amplifier input port is connected with the input port of low pass filter, the delivery outlet of the low pass filter with
The input port for suppressing compensation amplifier is connected, the receiving terminal amplifier delivery outlet and the output for suppressing compensation amplifier
Mouth is connected；
The receiving terminal amplifier, a pair of the Difference signal pairs sent for real-time reception differential signal transmitting terminal its be amplified
Handle and export；
The low pass filter, for being filtered to a pair of differential signals received by the receiving terminal amplifier input port
Processing, and the signal after processing is sent to the suppression compensation amplifier；
It is described to suppress compensation amplifier, a pair of direct current compensation signals are obtained for being amplified processing to the signal received, are adopted
A pair of differential signals of the receiving terminal delivery outlet obtained in real time are subtracted into corresponding a pair of direct current compensation signals with subtracter, obtained
Output signal after compensation.
8. system according to claim 7, it is characterised in that including：
It is described to suppress the amplifier that compensation amplifier uses same type with the receiving terminal amplifier.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310412717.2A CN103441973B (en) | 2013-09-11 | 2013-09-11 | A kind of differential signal suppresses compensation method, apparatus and system |
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| CN201310412717.2A CN103441973B (en) | 2013-09-11 | 2013-09-11 | A kind of differential signal suppresses compensation method, apparatus and system |
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| CN103441973A CN103441973A (en) | 2013-12-11 |
| CN103441973B true CN103441973B (en) | 2017-07-28 |
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| KR101971564B1 (en) * | 2016-08-08 | 2019-04-23 | 선전 구딕스 테크놀로지 컴퍼니, 리미티드 | COMMON MODE NOISE PROCESSING METHOD AND COMMON MODE NOISE PROCESSING DEVICE |
| CN114978073A (en) * | 2022-05-18 | 2022-08-30 | 深圳先进技术研究院 | Amplifying circuit, detection chip and wearable equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4091671B2 (en) * | 1995-08-08 | 2008-05-28 | 松下電器産業株式会社 | DC offset compensator |
| DE10036889C1 (en) * | 2000-07-28 | 2002-04-18 | Infineon Technologies Ag | Determining offset occurring in differential transmission signal section of radio device, by commutatively connecting outputs to differential receiver signals sections |
| JP2002232271A (en) * | 2001-02-01 | 2002-08-16 | Fujitsu Ltd | Dc offset cancel circuit, optic/electric pulse converting circuit and pulse shaping circuit |
| JP4734262B2 (en) * | 2007-01-26 | 2011-07-27 | 株式会社東芝 | Receiving device, wireless device, offset canceling method |
| CN102185812A (en) * | 2011-05-13 | 2011-09-14 | 吉林大学 | DC (direct-current) offset filtering circuit |
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