CN105119657A - High-speed multi-rate adaptive rate detection circuit - Google Patents
High-speed multi-rate adaptive rate detection circuit Download PDFInfo
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- CN105119657A CN105119657A CN201510583154.2A CN201510583154A CN105119657A CN 105119657 A CN105119657 A CN 105119657A CN 201510583154 A CN201510583154 A CN 201510583154A CN 105119657 A CN105119657 A CN 105119657A
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Abstract
The invention is applied to the field of photo-communication, and provides a high-speed multi-rate adaptive rate detection circuit, wherein an MCU controller is connected with an AC power meter, a numerical control crystal oscillator and a locking detection circuit. Specifically, the AC power meter is used for inputting a total power existed in a low frequency component of a data signal via calculation and outputting an average voltage; the MCU controller is used for obtaining an original frequency outputting to the numerical control crystal oscillator according to the average voltage input by the AC power meter; and the MCU controller is further used for receiving a triggering message of the locking detection circuit, and calling the AC power meter to re-calculate the original frequency of the numerical control crystal oscillator; the locking detection circuit is used for comparing a working frequency of the numerical control crystal oscillator and the frequency of the input data signal, and transmitting the triggering message to the MCU controller if the difference of the frequencies exceeds a preset threshold value. The detection circuit provided by the embodiment of the invention reduces system version maintenance cost and quality risk, and improves convenience for system maintenance and upgrade.
Description
Technical field
The invention belongs to optical communication field, particularly relate to a kind of high speed multi-velocity self-adapting rate detection circuit.
Background technology
Optical module is the core component of optical fiber telecommunications system.Its effect is exactly opto-electronic conversion, and transmitting terminal converts light signal to the signal of telecommunication, and after being transmitted by optical fiber, receiving terminal converts the signal of telecommunication to light signal again.Can its performance quality normally work directly having influence on optical communication system, thus affect the communication between user.Along with the development of 3G, 4G cordless communication network, the interconnected comprehensive employing optical fiber between base station, also increases greatly to the demand of optical module.The application scenarios of base station, its environment for use is comparatively harsh, has higher requirement to the performance of optical module and reliability.Interconnecting interface standard between current base station is CPRI (CommonPublicRadioInterface).The a series of speed of CPRI standard definition, according to up-to-date CRPI standard v6.0 version, comprises CPRIoption1-8 (from 614.4Mbit/s to 10137.6Mbit/s totally eight kinds of speed).And traditional optical module only supports single-rate, after equipment needs multi tate, traditional module just can not meet instructions for use, needs to repeat the optical module purchasing multiple different rates.Bring very large inconvenience to user like this, also reduce service efficiency simultaneously.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of high speed multi-velocity self-adapting rate detection circuit, only single-rate is supported to solve optical module of the prior art, after equipment needs multi tate, traditional module just can not meet instructions for use, need to repeat the optical module purchasing multiple different rates, bring very large inconvenience to user like this, also reduce the problem of service efficiency simultaneously.
The embodiment of the present invention realizes like this, embodiments provide a kind of high speed multi-velocity self-adapting rate detection circuit on the one hand, rate detection circuit comprises AC power meter, Numerically Controlled Oscillator, lock detecting circuit and MCU controller, wherein, MCU controller connects described AC power meter, Numerically Controlled Oscillator and lock detecting circuit, concrete:
Described AC power meter, for the total power existed in the low frequency component by calculating input data signal, and gives described MCU controller according to described total power stage average voltage;
Described MCU controller, for the average voltage according to described AC power meter, obtains the original frequency for inputing to Numerically Controlled Oscillator; Described MCU controller also for receiving the Trigger message of lock detecting circuit, and calls the original frequency that AC power meter recalculates Numerically Controlled Oscillator;
Described lock detecting circuit, for the frequency of the operating frequency and described input data signal that compare Numerically Controlled Oscillator, if the difference of frequency exceeds predetermined threshold value, sends Trigger message to described MCU controller.
Preferably, described rate detection circuit also comprises photodiode, preamplifier, limiting amplifier, low pass filter, concrete:
Described photodiode, preamplifier, limiting amplifier, low pass filter connect successively, and the signal after filtering is sent to AC power meter, for calculating the average voltage existed in the low frequency component of input data signal.
Preferably, described predetermined threshold value is specially 1000ppm.
Preferably, described low frequency component is specially the signal that frequency is less than 100M.
On the other hand, the embodiment of the present invention additionally provides a kind of high speed multi-velocity self-adapting speed detection method, described method comprises AC power meter, Numerically Controlled Oscillator, lock detecting circuit and MCU controller, wherein, MCU controller connects described AC power meter, Numerically Controlled Oscillator and lock detecting circuit, concrete:
Described AC power meter by calculating the total power existed in the low frequency component of input data signal, and gives described MCU controller according to described total power stage voltage signal;
The average voltage that described MCU controller calculates according to institute AC power meter, obtains the original frequency for inputing to Numerically Controlled Oscillator;
In the Numerically Controlled Oscillator course of work, described lock detecting circuit compares the operating frequency of Numerically Controlled Oscillator and the frequency of described input data signal, if the difference of frequency exceeds predetermined threshold value, sends Trigger message to described MCU controller;
Described MCU controller receives the Trigger message of lock detecting circuit, and calls the original frequency that AC power meter recalculates Numerically Controlled Oscillator.
Preferably, the average voltage existed in the low frequency component of the input data signal that described MCU controller calculates according to institute AC power meter, after obtaining the original frequency for inputing to Numerically Controlled Oscillator, also comprises:
If data rate frequency is greater than data sample rates, then improve Numerically Controlled Oscillator frequency; Concrete:
Time initial, Numerically Controlled Oscillator frequency increases progressively to support Quick Acquisition with larger step-length; When Numerically Controlled Oscillator frequency is close to data frequency, step-length reduces, until Numerically Controlled Oscillator frequency is in the preset range of data frequency.
Preferably, described initial time, Numerically Controlled Oscillator frequency increases progressively to support Quick Acquisition with larger step-length; When Numerically Controlled Oscillator frequency is close to data frequency, step-length reduces, until Numerically Controlled Oscillator frequency is in the preset range of data frequency, specifically comprises:
Numerically Controlled Oscillator frequency resets to the lower limit of its scope, and inner setting of divider is minimum N=1; The multiple of N compared with data rate frequency, if sampling rate frequency is greater than data rate frequency, then improves by frequency detector by this sampling rate frequency.
Preferably, described preset range is 0-250ppm.
Preferably, the average voltage existed in the low frequency component of the input data signal that described MCU controller calculates according to institute AC power meter, obtaining the original frequency for inputing to Numerically Controlled Oscillator, specifically comprising:
Described MCU controller, according to the voltage-frequency relation table of the AC power meter stored, is searched the frequency values under corresponding described average voltage, and described frequency values is inputed to Numerically Controlled Oscillator as its original frequency.
Preferably, described low frequency component is specially the signal that frequency is less than 100M.
The beneficial effect of a kind of high speed multi-velocity self-adapting rate detection circuit that the embodiment of the present invention provides comprises: the testing circuit that the embodiment of the present invention provides and method, solve in correlation technique and need to support different pieces of information transmission rate by disparate modules, thus cause cost to increase and safeguard and inconvenient problem of upgrading, and then reduce system version maintenance cost and quality risk, improve the convenience of system maintenance and upgrading.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of a kind of high speed multi-velocity self-adapting rate detection circuit that the embodiment of the present invention provides;
Fig. 2 is the schematic flow sheet of a kind of high speed multi-velocity self-adapting speed detection method that the embodiment of the present invention provides;
Fig. 3 is the voltage-frequency corresponding relation figure of a kind of AC power meter that the embodiment of the present invention provides;
Fig. 4 is the schematic flow sheet of a kind of high speed multi-velocity self-adapting speed detection method that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
In order to technical solutions according to the invention are described, be described below by specific embodiment.
Embodiment one
Be illustrated in figure 1 a kind of high speed multi-velocity self-adapting rate detection circuit that the embodiment of the present invention provides, as shown in Figure 1, a kind of high speed multi-velocity self-adapting rate detection circuit provided by the invention:
The embodiment of the present invention realizes like this, embodiments provide a kind of high speed multi-velocity self-adapting rate detection circuit on the one hand, rate detection circuit comprises AC power meter 15, Numerically Controlled Oscillator 16, lock detecting circuit 17 and MCU controller 18, wherein, MCU controller 18 connects described AC power meter 15, Numerically Controlled Oscillator 16 and lock detecting circuit 17, concrete:
Described AC power meter 15, for the total power existed in the low frequency component by calculating input data signal, and on average gives described MCU controller 18 according to described total power stage;
Described MCU controller 18, for the average voltage according to described AC power meter 15, obtains the original frequency for inputing to Numerically Controlled Oscillator 16; Described MCU controller 18 also for receiving the Trigger message of lock detecting circuit 17, and calls the original frequency that AC power meter 15 recalculates Numerically Controlled Oscillator 16;
Described lock detecting circuit 17, for the frequency of the operating frequency and described input data signal that compare Numerically Controlled Oscillator 16, if the difference of frequency exceeds predetermined threshold value, sends Trigger message to described MCU controller 18.
The testing circuit that the embodiment of the present invention provides, solve in correlation technique and need to support different pieces of information transmission rate by disparate modules, thus cause cost to increase and safeguard and inconvenient problem of upgrading, and then reduce system version maintenance cost and quality risk, improve the convenience of system maintenance and upgrading.
There is a kind of preferred scheme in conjunction with the embodiment of the present invention, wherein, described rate detection circuit also comprises photodiode 11, preamplifier 12, limiting amplifier 13, low pass filter 14, as shown in Figure 1, concrete:
Described photodiode 11, preamplifier 12, limiting amplifier 13, low pass filter 14 connect successively, and the signal after filtering is sent to AC power meter 15, for calculating the average voltage existed in the low frequency component of input data signal.
There is a kind of preferred scheme in conjunction with the embodiment of the present invention, wherein, described predetermined threshold value is specially 1000ppm.
There is a kind of preferred scheme in conjunction with the embodiment of the present invention, wherein, described low frequency component is specially the signal that frequency is less than 100M.
Embodiment two
The embodiment of the present invention additionally provides a kind of high speed multi-velocity self-adapting speed detection method, described method comprises AC power meter 15, Numerically Controlled Oscillator 16, lock detecting circuit 17 and MCU controller 18, wherein, MCU controller 18 connects described AC power meter 15, Numerically Controlled Oscillator 16 and lock detecting circuit 17, as shown in Figure 2, specifically comprise the following steps:
In step 201, described AC power meter 15 by calculating the total power existed in the low frequency component of input data signal, and gives described MCU controller 18 according to described total power stage voltage signal.
In step 202., the average voltage that described MCU controller 18 calculates according to institute AC power meter 15, obtains the original frequency for inputing to Numerically Controlled Oscillator 16.
In step 203, in Numerically Controlled Oscillator 16 course of work, described lock detecting circuit 17 compares the operating frequency of Numerically Controlled Oscillator 16 and the frequency of described input data signal, if the difference of frequency exceeds predetermined threshold value, sends Trigger message to described MCU controller 18.
In step 204, described MCU controller 18 receives the Trigger message of lock detecting circuit 17, and calls the original frequency that AC power meter 15 recalculates Numerically Controlled Oscillator 16.
The detection method that the embodiment of the present invention provides, solve in correlation technique and need to support different pieces of information transmission rate by disparate modules, thus cause cost to increase and safeguard and inconvenient problem of upgrading, and then reduce system version maintenance cost and quality risk, improve the convenience of system maintenance and upgrading.
A kind of preferred scheme is there is in conjunction with the embodiment of the present invention, wherein, the average voltage existed in the low frequency component of the input data signal that described MCU controller 18 calculates according to institute AC power meter 15, after obtaining the original frequency for inputing to Numerically Controlled Oscillator 16, also comprises:
If data rate frequency is greater than data sample rates, then improve Numerically Controlled Oscillator 16 frequency; Concrete:
There is a kind of preferred scheme in conjunction with the embodiment of the present invention, wherein, Numerically Controlled Oscillator 16 frequency increases progressively to support Quick Acquisition with larger step-length; When Numerically Controlled Oscillator 16 frequency is close to data frequency, step-length reduces, until Numerically Controlled Oscillator 16 frequency is in the preset range of data frequency.
There is a kind of preferred scheme in conjunction with the embodiment of the present invention, wherein, described initial time, Numerically Controlled Oscillator 16 frequency increases progressively to support Quick Acquisition with larger step-length; When Numerically Controlled Oscillator 16 frequency is close to data frequency, step-length reduces, until Numerically Controlled Oscillator 16 frequency is in the preset range of data frequency, specifically comprises:
Numerically Controlled Oscillator 16 frequency resets to the lower limit of its scope, and inner setting of divider is minimum N=1; The multiple of N compared with data rate frequency, if sampling rate frequency is greater than data rate frequency, then improves by frequency detector by this sampling rate frequency.
There is a kind of preferred scheme in conjunction with the embodiment of the present invention, wherein, described preset range is 0-250ppm.
A kind of preferred scheme is there is in conjunction with the embodiment of the present invention, wherein, the average voltage existed in the low frequency component of the input data signal that described MCU controller 18 calculates according to institute AC power meter 15, obtaining the original frequency for inputing to Numerically Controlled Oscillator 16, specifically comprising:
Described MCU controller 18, according to the voltage-frequency relation table of the AC power meter 15 stored, is searched the frequency values under corresponding described average voltage, and described frequency values is inputed to Numerically Controlled Oscillator 16 as its original frequency.Wherein, the curve chart presented by voltage-frequency relation table as shown in Figure 3.
There is a kind of preferred scheme in conjunction with the embodiment of the present invention, wherein, described low frequency component is specially the signal that frequency is less than 100M.
Embodiment three
The present embodiment is based in embodiment one and embodiment two basis, in conjunction with concrete circuit and method, sets forth under concrete implementation environment, how to realize method of the present invention design with more complete method flow.As shown in Figure 4, following execution step is specifically comprised:
In step 301, photodiode 11 receives the input data signal sent from optical fiber, and each input data signal has a data rate.
In step 302, preamplifier 12 is amplified to suitable voltage level input data signal.
In step 303, MCU controller 18 judges currently whether be in Numerically Controlled Oscillator operating state, then enters step 304 if not; If then enter step 308.
In step 304, the voltage amplitude of limiting amplifier 13 input data signal be amplified to meet AC power meter range of needs in.
In step 305, low pass filter 14 filters out the component signal within the scope of frequency range 100M.
Within step 306, this average voltage by calculating the average voltage existed in the low frequency component of input data signal, and is fed back to MCU controller 18 by AC power meter 15.
In step 307, the average voltage existed in the low frequency component of the input data signal that MCU controller 18 calculates according to institute AC power meter 15, obtains the original frequency for inputing to Numerically Controlled Oscillator 16.
In step 308, in Numerically Controlled Oscillator 16 course of work, described lock detecting circuit 17 compares the operating frequency of Numerically Controlled Oscillator 16 and the frequency of described input data signal, if the difference of frequency exceeds predetermined threshold value, sends Trigger message to described MCU controller 18.
In a step 309, described MCU controller 18 receives the Trigger message of lock detecting circuit 17, gets back to step 301 and calls the original frequency that AC power meter 15 recalculates Numerically Controlled Oscillator 16.
The detection method that the embodiment of the present invention provides, solve in correlation technique and need to support different pieces of information transmission rate by disparate modules, thus cause cost to increase and safeguard and inconvenient problem of upgrading, and then reduce system version maintenance cost and quality risk, improve the convenience of system maintenance and upgrading.
Those of ordinary skill in the art it is also understood that, the all or part of step realized in above-described embodiment method is that the hardware that can carry out instruction relevant by program has come, described program can be stored in a computer read/write memory medium, described storage medium, comprises ROM/RAM, disk, CD etc.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a high speed multi-velocity self-adapting rate detection circuit, it is characterized in that, described rate detection circuit comprises AC power meter, Numerically Controlled Oscillator, lock detecting circuit and MCU controller, wherein, MCU controller connects described AC power meter, Numerically Controlled Oscillator and lock detecting circuit, concrete:
Described AC power meter, for the total power existed in the low frequency component by calculating input data signal, and gives described MCU controller according to described total power stage average voltage;
Described MCU controller, for the average voltage according to described AC power meter, obtains the original frequency for inputing to Numerically Controlled Oscillator; Described MCU controller also for receiving the Trigger message of lock detecting circuit, and calls the original frequency that AC power meter recalculates Numerically Controlled Oscillator;
Described lock detecting circuit, for the frequency of the operating frequency and described input data signal that compare Numerically Controlled Oscillator, if the difference of frequency exceeds predetermined threshold value, sends Trigger message to described MCU controller.
2. testing circuit according to claim 1, is characterized in that, described rate detection circuit also comprises photodiode, preamplifier, limiting amplifier, low pass filter, concrete:
Described photodiode, preamplifier, limiting amplifier, low pass filter connect successively, and the signal after filtering is sent to AC power meter, for calculating the average voltage existed in the low frequency component of input data signal.
3. testing circuit according to claim 1, is characterized in that, described predetermined threshold value is specially 1000ppm.
4., according to the arbitrary described testing circuit of claim 1-3, it is characterized in that, described low frequency component is specially the signal that frequency is less than 100M.
5. a high speed multi-velocity self-adapting speed detection method, it is characterized in that, described method comprises AC power meter, Numerically Controlled Oscillator, lock detecting circuit and MCU controller, wherein, MCU controller connects described AC power meter, Numerically Controlled Oscillator and lock detecting circuit, concrete:
Described AC power meter by calculating the total power existed in the low frequency component of input data signal, and gives described MCU controller according to described total power stage voltage signal;
The average voltage that described MCU controller calculates according to institute AC power meter, obtains the original frequency for inputing to Numerically Controlled Oscillator;
In the Numerically Controlled Oscillator course of work, described lock detecting circuit compares the operating frequency of Numerically Controlled Oscillator and the frequency of described input data signal, if the difference of frequency exceeds predetermined threshold value, sends Trigger message to described MCU controller;
Described MCU controller receives the Trigger message of lock detecting circuit, and calls the original frequency that AC power meter recalculates Numerically Controlled Oscillator.
6. method according to claim 5, is characterized in that, the average voltage existed in the low frequency component of the input data signal that described MCU controller calculates according to institute AC power meter, after obtaining the original frequency for inputing to Numerically Controlled Oscillator, also comprises:
If data rate frequency is greater than data sample rates, then improve Numerically Controlled Oscillator frequency; Concrete:
Time initial, Numerically Controlled Oscillator frequency increases progressively to support Quick Acquisition with larger step-length; When Numerically Controlled Oscillator frequency is close to data frequency, step-length reduces, until Numerically Controlled Oscillator frequency is in the preset range of data frequency.
7. method according to claim 6, is characterized in that, described initial time, Numerically Controlled Oscillator frequency increases progressively to support Quick Acquisition with larger step-length; When Numerically Controlled Oscillator frequency is close to data frequency, step-length reduces, until Numerically Controlled Oscillator frequency is in the preset range of data frequency, specifically comprises:
Numerically Controlled Oscillator frequency resets to the lower limit of its scope, and inner setting of divider is minimum N=1; The multiple of N compared with data rate frequency, if sampling rate frequency is greater than data rate frequency, then improves by frequency detector by this sampling rate frequency.
8. the method according to claim 6 or 7, is characterized in that, described preset range is 0-250ppm.
9. method according to claim 5, is characterized in that, the average voltage existed in the low frequency component of the input data signal that described MCU controller calculates according to institute AC power meter, obtaining the original frequency for inputing to Numerically Controlled Oscillator, specifically comprising:
Described MCU controller, according to the voltage-frequency relation table of the AC power meter stored, is searched the frequency values under corresponding described average voltage, and described frequency values is inputed to Numerically Controlled Oscillator as its original frequency.
10., according to the arbitrary described testing circuit of claim 5-7, it is characterized in that, described low frequency component is specially the signal that frequency is less than 100M.
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| CN201510583154.2A CN105119657B (en) | 2015-09-14 | 2015-09-14 | High speed multi-velocity self-adapting speed detects circuit and method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002091649A2 (en) * | 2001-05-03 | 2002-11-14 | Coreoptics, Inc. | Clock recovery circuit |
| CN101800603A (en) * | 2010-02-11 | 2010-08-11 | 瑞斯康达科技发展股份有限公司 | Method for carrying out self adaptation in optical network according to rate and signal transmission device |
| CN102104394A (en) * | 2009-12-18 | 2011-06-22 | 中国科学院国家天文台 | Low-rate spread spectrum communication transmission base band system |
| CN103152103A (en) * | 2013-02-19 | 2013-06-12 | 青岛海信宽带多媒体技术有限公司 | Optical module and adaptive regulation method for rate mode of clock and data recovery (CDR) chip of optical module |
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2015
- 2015-09-14 CN CN201510583154.2A patent/CN105119657B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002091649A2 (en) * | 2001-05-03 | 2002-11-14 | Coreoptics, Inc. | Clock recovery circuit |
| CN102104394A (en) * | 2009-12-18 | 2011-06-22 | 中国科学院国家天文台 | Low-rate spread spectrum communication transmission base band system |
| CN101800603A (en) * | 2010-02-11 | 2010-08-11 | 瑞斯康达科技发展股份有限公司 | Method for carrying out self adaptation in optical network according to rate and signal transmission device |
| CN103152103A (en) * | 2013-02-19 | 2013-06-12 | 青岛海信宽带多媒体技术有限公司 | Optical module and adaptive regulation method for rate mode of clock and data recovery (CDR) chip of optical module |
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