CN113917855A - Automatic control circuit for transmission quality of differential signal - Google Patents
Automatic control circuit for transmission quality of differential signal Download PDFInfo
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- CN113917855A CN113917855A CN202010643726.2A CN202010643726A CN113917855A CN 113917855 A CN113917855 A CN 113917855A CN 202010643726 A CN202010643726 A CN 202010643726A CN 113917855 A CN113917855 A CN 113917855A
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- differential signal
- digital conversion
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
Abstract
The invention relates to an automatic control circuit for differential signal transmission quality, which comprises a differential signal adjusting circuit, a switch circuit, an isolating circuit, a high-frequency analog-digital conversion circuit, a data register and a microcontroller. The differential signal adjusting circuit is connected between the differential circuit and the load in series, the differential circuit testing branch is connected to the position of a cross point of the differential circuit and the load in parallel through the switch circuit, and the isolating circuit is located between the switch circuit and the high-frequency analog-digital conversion circuit. The microcontroller controls the switch circuit to enable the high-frequency analog-to-digital conversion circuit to collect a certain path or a plurality of paths of differential signals, receives the collected data, sends out corresponding instructions according to a preset regulation scheme, controls the differential signal regulation circuit to carry out corresponding regulation, and simultaneously stores the data collected by the high-frequency analog-to-digital conversion circuit into the data register. The invention realizes the optimized compensation of higher efficiency and lower power consumption under the condition of high-speed differential transmission abnormity.
Description
Technical Field
The invention belongs to the technical field of high-speed communication, and particularly relates to a circuit for automatically controlling transmission quality when a high-speed signal is transmitted through a differential circuit.
Background
With the rapid development of science and technology, high-speed signals are often transmitted through a scheme of differential transmission, so that the anti-interference capability is improved. When the differential signal transmission rate exceeds 1GHz in practical applications, the control of the signal quality becomes critical. In practical projects, the transmission of differential signals is often not in the state of lowest power consumption which enables the load to work normally. If the design is improper, the differential signal transmission is likely to be abnormal, so that a large amount of manpower and material resources are input for corresponding poor analysis; more seriously, this can lead to failure of the entire project, resulting in significant economic or property damage.
Meanwhile, in actual projects, differential signal wiring is very thin and is mostly in the range of tens of um magnitude, and in poor analysis of abnormal transmission of related differential signals, probes of used test equipment are all in the mm level, so that accurate measurement is difficult to achieve. In this case, it is inevitable to perform differential line pitch increase or via layer change processing, or perform copper exposure processing at the middle position of the transmission line, which may further introduce other interference factors, thereby affecting the accuracy of the measurement result.
In addition, for the detection of the transmission quality of the differential signal, the optimal position actually required to be measured should be the intersection position of the transmission line and the load, and the prior art capability is only limited to test and obtain at the middle position of the transmission line, so that the measured result is inaccurate.
Disclosure of Invention
The invention aims to solve the technical problem of providing an automatic control circuit for differential signal transmission quality, and realizing optimized compensation with higher efficiency and lower power consumption under the condition of high-speed differential transmission abnormity.
The invention relates to an automatic control circuit for differential signal transmission quality, which comprises a differential signal regulating circuit, a switching circuit, an isolating circuit, a high-frequency analog-digital conversion circuit, a data register and a microcontroller, wherein the differential signal regulating circuit is connected with the switching circuit;
the differential signal adjusting circuit is connected between the differential line and the load in series;
the switch circuit, the isolation circuit, the high-frequency analog-to-digital conversion circuit, the data register and the microcontroller form a differential line test branch circuit, and the differential line test branch circuit is connected to the position of a cross point of the differential line and a load in parallel through the switch circuit;
the switch circuit is used for realizing the on-off function of the differential line test branch circuit;
the isolation circuit is positioned between the switch circuit and the high-frequency analog-digital conversion circuit, and the isolation circuit only allows a signal to be transmitted to the high-frequency analog-digital conversion circuit in a single direction from the switch circuit and cannot transmit the signal in a reverse direction;
the high-frequency analog-to-digital conversion circuit realizes analog-to-digital conversion of the detected differential signal;
the microcontroller controls the switch circuit to enable the high-frequency analog-to-digital conversion circuit to collect a certain path or a plurality of paths of differential signals, receives the collected data, sends out corresponding instructions according to a preset regulation scheme and controls the differential signal regulation circuit to carry out corresponding regulation; and simultaneously storing the data collected by the high-frequency analog-to-digital conversion circuit into the data register.
Further, the isolation circuit is implemented by a diode.
Further, the pre-programmed regulation scheme in the microcontroller comprises:
when the received and collected differential signals meet the set threshold requirement, the differential signal transmission is judged to be normal, and the microcontroller controls the switch to be switched off;
and when the received and collected differential signal does not meet the set threshold requirement, regulating and controlling the differential signal circuit according to the specific situation of the differential signal until the threshold requirement is met.
Further, when the differential signal does not meet the set threshold requirement, the following specific conditions of the signal are respectively regulated and controlled:
when the voltage amplitude of the differential signal is lower than the lower limit requirement of a set threshold, amplifying the differential signal in multiple gears until the lower limit requirement of the threshold is met; conversely, when the voltage amplitude of the differential signal is higher than the upper limit requirement of the set threshold, reducing the differential signal in multiple gears until the upper limit requirement of the threshold is met;
when the climbing time of the differential signal is too long, the driving capability of differential transmission is gradually improved so as to reduce the climbing time of the differential signal to an optimal state; on the contrary, when the ramp time of the differential signal is too short, the driving capability of the differential transmission is gradually reduced to reduce the ramp time of the differential signal to the optimal state.
Further, the optimal state is a lowest power consumption state that meets a defined threshold.
The invention has the following beneficial effects:
(1) the invention detects the quality of the differential signal based on the integrated consistency test circuit system, specifically analyzes the detection result and outputs a corresponding regulation scheme, thereby realizing the automatic optimization compensation function of differential signal transmission. Under the condition of not changing the original design scheme, the automatic optimization control of differential signal transmission is realized, the labor and time cost is greatly reduced, and the efficiency of differential signal transmission is also improved;
(2) the economic or property loss caused by abnormal transmission of the differential signals is reduced to the maximum extent;
(3) for the detection of the quality of the differential transmission signal, the differential signal routing theoretically needs to perform differential line spacing increase or perforation layer changing treatment, or perform copper exposure treatment at the middle position of the transmission line, and meanwhile, compared with the prior art, the integrated consistency test circuit system can greatly improve the measurement accuracy;
(4) the quality requirement of high-frequency signals under the condition of differential transmission rate of more than 1GHz can be met.
Drawings
FIG. 1 is a functional block diagram of the integrated conformance test circuit of the present invention;
FIG. 2 is a flow chart of a pre-programmed tuning scheme in the microcontroller;
fig. 3 illustrates a control method for different signal types when the threshold is not met.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention detects the quality of the differential signal based on the integrated consistency test circuit, specifically analyzes the detection result and outputs a corresponding regulation scheme, thereby realizing the automatic optimization compensation function of differential signal transmission.
As shown in fig. 1, the integrated conformance test circuit comprises: the circuit comprises a differential signal regulating circuit, a switching circuit, an isolating circuit, a high-frequency analog-to-digital conversion circuit, a data register and a microcontroller.
Specifically, the differential signal adjusting circuit is connected in series between the differential line and the load, and assuming that the intersection point between the differential signal adjusting circuit and the load and the switching circuit is a point K, the differential signal adjusting circuit realizes the functions of adjusting the multi-gear amplification or reduction of the differential signal, accelerating or slowing down the signal climbing time and the like. The switch circuit is connected to the intersection point position K of the differential circuit and the load in parallel, and the function of the switch circuit is to realize the on-off function of the test branch of the differential circuit. The isolation circuit is arranged between the high-frequency analog-digital conversion circuit and the switch circuit, only allows the signal to be transmitted to the high-frequency analog-digital conversion circuit in a single direction from the switch circuit, and cannot be transmitted in a reverse direction, and can be realized by adopting a diode; the entire differential loop is guaranteed to be unaffected by operational variations of the integrated conformance test circuitry. The high-frequency analog-to-digital conversion circuit realizes analog-to-digital conversion of the detected differential signal. The microcontroller can control the switch circuit, so that the high-frequency analog-to-digital conversion circuit can automatically acquire a certain path or a plurality of paths of differential signals, then a user protocol analysis module of the microcontroller analyzes acquired data in real time to acquire information such as amplitude, duty ratio and rise time of the acquired differential signals, the information is compared with a set communication threshold value, a corresponding instruction is sent according to a set adjustment scheme, the differential signal adjustment circuit is controlled to perform corresponding adjustment, and a flow chart of the adjustment scheme is shown in fig. 2. Meanwhile, data collected by the high-frequency analog-to-digital conversion circuit can be stored in the data register under control, so that the stable operation of the whole integrated test circuit system is controlled, and the automatic control function of differential line transmission is realized.
The differential regulating circuit can realize the functions of regulating and controlling the voltage and current parameters of the differential line, and simultaneously, the differential regulating circuit also comprises the control of all information related to the consistency test, such as the duty ratio, climbing time and the like of differential signal transmission.
The pre-established regulation scheme in the microcontroller consists in first operating the entire differential circuit in a default certain state, with all the switching circuits open. Then the microcontroller controls the switch circuit to make the high-frequency A/D conversion circuit sample the appointed path or paths of differential signals and send the collected data to the user protocol analysis module. When the collected differential signals meet the set threshold requirement, the transmission of the differential signals is judged to be normal, and the microcontroller controls the switch circuit to close the integrated consistency test circuit system.
When the collected differential signal does not meet the set threshold requirement, specific analysis is performed for specific situations, and the specific analysis is shown in fig. 3. For example, when the voltage amplitude of the differential signal is lower than the lower limit requirement of the set threshold, the differential signal adjusting circuit can be controlled to amplify the differential signal in multiple gears until the lower limit requirement of the threshold is met; on the contrary, when the voltage amplitude of the differential signal is higher than the upper limit requirement of the set threshold, the differential signal adjusting circuit can be controlled to reduce the differential signal in multiple steps until the upper limit requirement of the threshold is met. When the climbing time of the differential signal is too long, the differential signal adjusting circuit can be controlled to gradually improve the driving capability of differential transmission so as to reduce the climbing time of the differential signal to an optimal state; conversely, when the ramp-up time of the differential signal is too short, the differential signal adjusting circuit may be controlled to gradually decrease the driving capability of the differential transmission to reduce the ramp-up time of the differential signal to an optimum state, and so on. The optimal state referred to herein may be set to the lowest power consumption state that meets a defined threshold.
The above embodiments are only for explaining and explaining the technical solution of the present invention, but should not be construed as limiting the scope of the claims. It should be clear to those skilled in the art that any simple modification or replacement based on the technical solution of the present invention may be adopted to obtain a new technical solution, which falls within the scope of the present invention.
Claims (5)
1. An automatic control circuit for transmission quality of differential signals is characterized by comprising a differential signal adjusting circuit, a switch circuit, an isolating circuit, a high-frequency analog-to-digital conversion circuit, a data register and a microcontroller;
the differential signal adjusting circuit is connected between the differential line and the load in series;
the switch circuit, the isolation circuit, the high-frequency analog-to-digital conversion circuit, the data register and the microcontroller form a differential line test branch circuit, and the differential line test branch circuit is connected to the position of a cross point of the differential line and a load in parallel through the switch circuit;
the switch circuit is used for realizing the on-off function of the differential line test branch circuit;
the isolation circuit is positioned between the switch circuit and the high-frequency analog-digital conversion circuit, and the isolation circuit only allows a signal to be transmitted to the high-frequency analog-digital conversion circuit in a single direction from the switch circuit and cannot transmit the signal in a reverse direction;
the high-frequency analog-to-digital conversion circuit realizes analog-to-digital conversion of the detected differential signal;
the microcontroller controls the switch circuit to enable the high-frequency analog-to-digital conversion circuit to collect a certain path or a plurality of paths of differential signals, receives the collected data, sends out corresponding instructions according to a preset regulation scheme and controls the differential signal regulation circuit to carry out corresponding regulation; and simultaneously storing the data collected by the high-frequency analog-to-digital conversion circuit into the data register.
2. An automatic control circuit for transmission quality of differential signals according to claim 1, characterized in that said isolation circuit is implemented by means of diodes.
3. An automatic control circuit for differential signal transmission quality according to claim 1 or 2, characterized in that the pre-programmed regulation scheme in the microcontroller comprises:
when the received and collected differential signals meet the set threshold requirement, the differential signal transmission is judged to be normal, and the microcontroller controls the switch to be switched off;
and when the received and collected differential signal does not meet the set threshold requirement, regulating and controlling the differential signal circuit according to the specific situation of the differential signal until the threshold requirement is met.
4. An automatic control circuit for transmission quality of differential signals according to claim 3, characterized in that when the differential signal does not meet the set threshold requirement, the following signal details are respectively regulated and controlled:
when the voltage amplitude of the differential signal is lower than the lower limit requirement of a set threshold, amplifying the differential signal in multiple gears until the lower limit requirement of the threshold is met; conversely, when the voltage amplitude of the differential signal is higher than the upper limit requirement of the set threshold, reducing the differential signal in multiple gears until the upper limit requirement of the threshold is met;
when the climbing time of the differential signal is too long, the driving capability of differential transmission is gradually improved so as to reduce the climbing time of the differential signal to an optimal state; on the contrary, when the ramp time of the differential signal is too short, the driving capability of the differential transmission is gradually reduced to reduce the ramp time of the differential signal to the optimal state.
5. An automatic control circuit for differential signal transmission quality as claimed in claim 4, characterized in that said optimum state is the lowest power consumption state satisfying a defined threshold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010643726.2A CN113917855A (en) | 2020-07-07 | 2020-07-07 | Automatic control circuit for transmission quality of differential signal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010643726.2A CN113917855A (en) | 2020-07-07 | 2020-07-07 | Automatic control circuit for transmission quality of differential signal |
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| CN113917855A true CN113917855A (en) | 2022-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010643726.2A Pending CN113917855A (en) | 2020-07-07 | 2020-07-07 | Automatic control circuit for transmission quality of differential signal |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101150547A (en) * | 2005-09-13 | 2008-03-26 | 华为技术有限公司 | Method and device for eliminating differential transfer delay difference |
| CN104198036A (en) * | 2014-09-10 | 2014-12-10 | 上海理工大学 | Power measuring circuit |
| CN110930914A (en) * | 2019-12-17 | 2020-03-27 | 京东方科技集团股份有限公司 | Signal detection circuit, signal detection method and display device |
-
2020
- 2020-07-07 CN CN202010643726.2A patent/CN113917855A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101150547A (en) * | 2005-09-13 | 2008-03-26 | 华为技术有限公司 | Method and device for eliminating differential transfer delay difference |
| CN104198036A (en) * | 2014-09-10 | 2014-12-10 | 上海理工大学 | Power measuring circuit |
| CN110930914A (en) * | 2019-12-17 | 2020-03-27 | 京东方科技集团股份有限公司 | Signal detection circuit, signal detection method and display device |
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