CN105577138A - Self-adaptive dynamic impedance matching method - Google Patents
Self-adaptive dynamic impedance matching method Download PDFInfo
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- CN105577138A CN105577138A CN201510890516.2A CN201510890516A CN105577138A CN 105577138 A CN105577138 A CN 105577138A CN 201510890516 A CN201510890516 A CN 201510890516A CN 105577138 A CN105577138 A CN 105577138A
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- 230000000694 effects Effects 0.000 abstract description 2
- 230000008901 benefit Effects 0.000 description 4
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/02—Multiple-port networks
- H03H11/28—Impedance matching networks
- H03H11/30—Automatic matching of source impedance to load impedance
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Abstract
The invention belongs to the technical field of a circuit system and specifically relates to a self-adaptive dynamic impedance matching method. Real-time dynamic impedance matching can be carried out according to the actual signal quality of the system under the condition of not changing system hardware circuit design, so that the problem of circuit redesign due to signal integrity problem is fundamentally solved, and cost can be effectively saved. According to the scheme, the circuit can be packaged into a standard general module, and the module is added to the circuit during design without redesigning the circuit, so that good reusability is achieved; a programmable logic chip is utilized as an algorithm realization carrier, so that different algorithms can be loaded according to the requirements of users, and very flexible and convenient use effect is achieved; and the module is fully realized by hardware, so that dynamic impedance matching and adjustment can be realized without a processor, and time and cost are saved to some extent.
Description
Technical field
The invention belongs to Circuits System technical field, be specifically related to a kind of self adaptation dynamic impedance matching method.
Background technology
Self adaptation dynamic impedance matching is the problems of Signal Integrity produced to solve Circuits System high speed Signal transmissions.At present in Circuits System, along with the lifting of system complexity and integrated level, system operating frequency significantly improves.Processor working frequency rises to 3 ~ 5GHz from traditional hundreds of megahertz, while being lifted at of system operating frequency brings high bandwidth and high data rate, also the such as a series of signal such as signal cross-talk, reflection integrity issue is brought, have a strong impact on the quality of signal, upset by mistake waits series of problems to cause circuit to occur, has fatal impact to the stability of system.
Signal path adds build-out resistor and effectively can solve the problems of Signal Integrity such as signal reflex.Traditional mode estimates the quality of signal when circuit design, selects corresponding build-out resistor to carry out circuit design according to the signal quality estimated.The shortcoming of this mode is that the factor affecting signal integrity in circuit design is a lot, and signalman's working frequency, signal lead length, bus plane and distribution of strata situation and production and processing quality etc. all can affect the quality of signal.Therefore, the method adopting tradition to estimate often does not reach the effect of optimized signal integrity.Therefore, need to utilize a kind of flexibly, dynamic impedance matching method of adjustment regulates dynamically to the quality of the high speed signal in system under different operating state, guarantee the optimization of signal quality, realize the reliable and stable of system.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is: how to provide one self adaptation dynamic impedance matching method flexibly.Utilize the method can the self adaptation dynamic conditioning of realizing circuit system high speed signal quality, effectively can improve the signal integrity of system and the stability of system.
(2) technical scheme
For solving the problems of the technologies described above, the invention provides a kind of self adaptation dynamic impedance matching method, the method carrys out the real-time Dynamic Matching of realizing circuit impedance based on dynamic impedance matching module; This dynamic impedance matching module described, comprising: sampling feedback circuit, programmable logic chip and electric resistance array module; Wherein, the signal of sampling feedback circuit on real-time sampling circuit, converts digital quantity to by digital-to-analogue conversion and sends programmable logic chip to; Programmable logic chip is used for the digital quantity received to carry out computing by dynamic impedance matching algorithm, determines whether to need to compensate and the numerical value of compensation rate, produces corresponding compensation codes and send to electric resistance array module; Electric resistance array module to be gone forward side by side row decoding for receiving compensation codes, selects corresponding resistance access circuit, and completing circuit compensates;
Wherein, described dynamic impedance matching algorithm is: the sampled point number n first determining some, obtains the signal quality information a of this circuit
1, a
2a
n, according to the standard deviation s of these signal quality informations of following formulae discovery and preset signals quality information data X;
And by standard deviation s compared with preset signals quality threshold α, if s≤α, then this circuit does not need to compensate; If s > is α, then this circuit needs to compensate, and according to the data of difference β=(the s-α) of the two with the ratio determination compensation rate of predesigned compensation exponent number γ, produces corresponding compensation codes and send to electric resistance array module;
Described electric resistance array module comprises: decoder, multiple resistive element and variable connector; The input of described decoder is connected with programmable logic chip, and receive the compensation codes that programmable logic chip is sent, each output of decoder accesses the resistance of a different resistance; The selection of resistance is realized in the other end access variable connector of resistance; Variable connector output access signal path, accesses in signal path by the resistance chosen; That is, described electric resistance array module receives the compensation codes that programmable logic chip sends over, and carries out decoding by built-in decoder, selects the resistance access circuit of respective channel to realize dynamic impedance matching.
(3) beneficial effect
The invention provides a kind of self adaptation dynamic impedance matching method, specifically refer to and utilize Circuits System high speed signal to adopt different matched impedances can cause the feature of signal quality variation in the transmission, signal quality information in dynamic Acquisition Circuit, according to the impedance of the information dynamic regulating circuit collected, the balance reaching signal quality and speed obtains good signal integrity.
Its technical advantage is: 1. can carry out real-time dynamic impedance coupling when not changing system hardware circuit design according to the signal quality of system reality, fundamentally solve the problem of the circuit that causes due to problems of Signal Integrity correcting again, can effectively provide cost savings; 2. this circuit can be encapsulated into a standard universal module, adding among circuit and need not redesign, having good reusability when designing; 3. this module have employed programmable logic chip and realizes carrier as algorithm, can load different algorithms, use very flexible according to the demand of user; 4. this module is completely by hardware implementing, does not need processor can realize dynamic conditioning and the coupling of impedance, saves time and cost to a certain extent.
Accompanying drawing explanation
Fig. 1 is module whole architecture principle figure in this programme.
Fig. 2 is electric resistance array cut-away view in this programme.
Fig. 3 is the dynamic conditioning flow chart of this programme.
Embodiment
For making object of the present invention, content and advantage clearly, below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.
For solving the problem of prior art, technical scheme of the present invention is as follows:
The present invention is mainly for the resistance matching problem of the signal integrity of solution Circuits System high speed signal.
This programme adopts a set of Intelligence Feedback Circuit tuning to realize system dynamic impedance matching function, and scheme framework as shown in Figure 1.The circuit part of this programme forms primarily of programmable logic device, sampling feedback circuit and electric resistance array three part, three parts form a dynamic impedance matching module, this module can be joined in system realize dynamic impedance matching function when system.
Wherein inside modules annexation is as follows: sampling feedback circuit is by signal sampling channel acquisition external signal and carry out changing and processing, and result is sent to programmable logic chip; Programmable logic chip is connected to the anti-array module of n roadlock (way n can be determined by the signalling channel number that will test), and the order of impedance adjustment is sent to each impedance array module by path; The impedance adjustment of each impedance array module in charge one road signal also can be linked in outer signal path.
This programme needs use one piece of programmable logic chip, and its function realizes dynamic impedance matching algorithm and adopts this algorithm adjusting resistance array according to the signal quality information obtained from sampling feedback circuit, realizes impedance matching function.Adopt the benefit of this chip to be: the configuration the first, can carrying out algorithm flexibly, adopts the circuit design that need not re-start module during new algorithm, needs new algorithm is loaded in chip.The second, make this module completely by hardware implementing, do not need processor can realize dynamic conditioning and the coupling of impedance.
This programme have employed sampling feedback circuit to realize for the signal quality on signal path Real-Time Monitoring with compare.This circuit is sampled to signal quality and by sampled result digitized feedback to programmable logic chip.When sampling to multiple signals, the corresponding road signal of each sampling channel of this circuit.
This programme have employed the impedance matching function that electric resistance array realizes module.In electric resistance array, each road signal correspond to the resistance of multiple different resistance, by being selected by the variable connector of Programmable logical controller, by the circuit of some specific resistances access signal path, to carry out impedance matching.The benefit done like this is the resistance including conventional multiple impedance matching in electric resistance array, can carry out switching at runtime, the optimization of realizing circuit impedance according to the quality of the signal quality in circuit.
The present invention is described in detail below in conjunction with specific embodiment.
Embodiment
In the present embodiment, the core concept of self adaptation dynamic impedance matching method is by the signal quality in real-time detection circuit, by dynamical Matching Algorithm determination circuit the need of compensating and compensation rate select the resistance access circuit of suitable resistance.
The self adaptation dynamic impedance matching method that the present embodiment provides, as shown in Figure 1-Figure 3, the method carrys out the real-time Dynamic Matching of realizing circuit impedance based on dynamic impedance matching module; This dynamic impedance matching module described as shown in Figure 1, comprising: sampling feedback circuit, programmable logic chip and electric resistance array module; Wherein, the signal of sampling feedback circuit on real-time sampling circuit, converts digital quantity to by digital-to-analogue conversion and sends programmable logic chip to; Programmable logic chip is used for the digital quantity received to carry out computing by dynamic impedance matching algorithm, determines whether to need to compensate and the numerical value of compensation rate, produces corresponding compensation codes and send to electric resistance array module; Electric resistance array module to be gone forward side by side row decoding for receiving compensation codes, selects corresponding resistance access circuit, and completing circuit compensates;
Wherein, described dynamic impedance matching algorithm is: the sampled point number n first determining some, obtains the signal quality information a of this circuit
1, a
2a
n, according to the standard deviation s of these signal quality informations of following formulae discovery and preset signals quality information data X;
And by standard deviation s compared with preset signals quality threshold α, if s≤α, then this circuit does not need to compensate; If s > is α, then this circuit needs to compensate, and according to the data of difference β=(the s-α) of the two with the ratio determination compensation rate of predesigned compensation exponent number γ, produces corresponding compensation codes and send to electric resistance array module;
Described electric resistance array inside modules structure as shown in Figure 2, comprising: decoder, multiple resistive element and variable connector; The input of described decoder is connected with programmable logic chip, and receive the compensation codes that programmable logic chip is sent, each output of decoder accesses the resistance of a different resistance; The selection of resistance is realized in the other end access variable connector of resistance; Variable connector output access signal path, accesses in signal path by the resistance chosen; That is, described electric resistance array module receives the compensation codes that programmable logic chip sends over, and carries out decoding by built-in decoder, selects the resistance access circuit of respective channel to realize dynamic impedance matching.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and distortion, these improve and distortion also should be considered as protection scope of the present invention.
Claims (1)
1. a self adaptation dynamic impedance matching method, is characterized in that, the method carrys out the real-time Dynamic Matching of realizing circuit impedance based on dynamic impedance matching module; This dynamic impedance matching module described, comprising: sampling feedback circuit, programmable logic chip and electric resistance array module; Wherein, the signal of sampling feedback circuit on real-time sampling circuit, converts digital quantity to by digital-to-analogue conversion and sends programmable logic chip to; Programmable logic chip is used for the digital quantity received to carry out computing by dynamic impedance matching algorithm, determines whether to need to compensate and the numerical value of compensation rate, produces corresponding compensation codes and send to electric resistance array module; Electric resistance array module to be gone forward side by side row decoding for receiving compensation codes, selects corresponding resistance access circuit, and completing circuit compensates;
Wherein, described dynamic impedance matching algorithm is: the sampled point number n first determining some, obtains the signal quality information a of this circuit
1, a
2a
n, according to the standard deviation s of these signal quality informations of following formulae discovery and preset signals quality information data X;
And by standard deviation s compared with preset signals quality threshold α, if s≤α, then this circuit does not need to compensate; If s > is α, then this circuit needs to compensate, and according to the data of difference β=(the s-α) of the two with the ratio determination compensation rate of predesigned compensation exponent number γ, produces corresponding compensation codes and send to electric resistance array module;
Described electric resistance array module comprises: decoder, multiple resistive element and variable connector; The input of described decoder is connected with programmable logic chip, and receive the compensation codes that programmable logic chip is sent, each output of decoder accesses the resistance of a different resistance; The selection of resistance is realized in the other end access variable connector of resistance; Variable connector output access signal path, accesses in signal path by the resistance chosen; That is, described electric resistance array module receives the compensation codes that programmable logic chip sends over, and carries out decoding by built-in decoder, selects the resistance access circuit of respective channel to realize dynamic impedance matching.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106646032A (en) * | 2016-11-25 | 2017-05-10 | 天津津航计算技术研究所 | Impedance automatic compensation module for temperature test |
| CN107154788A (en) * | 2017-04-21 | 2017-09-12 | 西安电子科技大学 | L-type impedance matching system and method in a kind of RF energy Acquisition Circuit |
| CN108418636A (en) * | 2018-02-09 | 2018-08-17 | 青岛海信宽带多媒体技术有限公司 | Optical module and impedance matching methods |
| CN111489531A (en) * | 2019-01-29 | 2020-08-04 | 杭州海康威视数字技术股份有限公司 | Method for adapting to line tail resistance of alarm host, electronic device and storage medium |
| CN118672190A (en) * | 2024-08-20 | 2024-09-20 | 杭州巴泰医疗器械有限公司 | Self-calibration impedance matching system of ultrasonic transducer and ultrasonic medical equipment |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106646032A (en) * | 2016-11-25 | 2017-05-10 | 天津津航计算技术研究所 | Impedance automatic compensation module for temperature test |
| CN107154788A (en) * | 2017-04-21 | 2017-09-12 | 西安电子科技大学 | L-type impedance matching system and method in a kind of RF energy Acquisition Circuit |
| CN107154788B (en) * | 2017-04-21 | 2020-07-07 | 西安电子科技大学 | An L-shaped impedance matching system and method in a radio frequency energy harvesting circuit |
| CN108418636A (en) * | 2018-02-09 | 2018-08-17 | 青岛海信宽带多媒体技术有限公司 | Optical module and impedance matching methods |
| CN108418636B (en) * | 2018-02-09 | 2021-06-25 | 青岛海信宽带多媒体技术有限公司 | Optical module and impedance matching method |
| CN111489531A (en) * | 2019-01-29 | 2020-08-04 | 杭州海康威视数字技术股份有限公司 | Method for adapting to line tail resistance of alarm host, electronic device and storage medium |
| CN118672190A (en) * | 2024-08-20 | 2024-09-20 | 杭州巴泰医疗器械有限公司 | Self-calibration impedance matching system of ultrasonic transducer and ultrasonic medical equipment |
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Application publication date: 20160511 |