CN201717880U - Adaptive equalization system - Google Patents
Adaptive equalization system Download PDFInfo
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- CN201717880U CN201717880U CN2010202897127U CN201020289712U CN201717880U CN 201717880 U CN201717880 U CN 201717880U CN 2010202897127 U CN2010202897127 U CN 2010202897127U CN 201020289712 U CN201020289712 U CN 201020289712U CN 201717880 U CN201717880 U CN 201717880U
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Abstract
An adaptive equalization system comprises an equalizer, a common-mode abstracting and buffing unit connected to the equalizer, a low pass filtering unit connected to the common-mode abstracting and buffing unit, a first energy comparing unit, a second energy comparing unit, a current comparator, and a numerical control unit. The common-mode abstracting and buffing unit transmits the full spectrum energy of an inputted signal outputted from the equalizer to the first energy comparing unit and to the low pass filtering unit; the common-mode abstracting and buffing unit also abstracts the common-mode of an outputted signal into the second energy comparing unit; the first energy comparing unit outputs a characterization high frequency energy current signal to the current comparator while the second energy comparing unit outputs a characterization low frequency energy current signal to the current comparator; the numerical control unit outputs an equalizing signal used to control the equalizer series to the equalizer. Simple in structure, the adaptive equalization system of the utility model reduces the power consumption of the chips, the size thereof and the manufacturing costs thereof as well.
Description
Technical field
The utility model relates to a kind of signal processing system, refers to a kind of Adaptive Equalization System simple in structure especially.
Background technology
In the high speed transmission of signals system, signal can produce decay after the transmission of long distance, thereby causes system receiving terminal to receive the signal of distortion.
For the loss of signal spectrum component on transmission medium in the compensated high-speed signal transmission system, often need use equalizer that the input signal that receives is carried out equilibrium treatment at system receiving terminal, obtain the less signal of distortion.
Existing equalizer is divided into two types of preset parameter and auto-adaptive parameters usually.For the preset parameter equalizer, its advantage is that simple in structure being easy to realized, but along with the variation of manufacturing process and the variation of channel itself can produce bigger error, if use same parameter all the time, portfolio effect is not optimum even can introduces extra shake and worsen signal quality.For the auto-adaptive parameter equalizer, parametric equalizer is adaptive to the variation of manufacturing process and channel itself, signal is carried out the perfection compensation, but traditional auto-adaptive parameter equaliser structure is very complicated, has increased power consumption, area and the manufacturing cost of chip.
Summary of the invention
In view of above content, be necessary to provide a kind of Adaptive Equalization System simple in structure.
A kind of Adaptive Equalization System, comprise an equalizer, one connects the common-mode extraction buffer cell of described equalizer, one connects the low-pass filter unit of described common-mode extraction buffer cell, one connects the first energy comparing unit of described low-pass filter unit, one connects the second energy comparing unit of described low-pass filter unit, one connects the described first energy comparing unit is connected described current comparator and described equalizer with the current comparator and of the described second energy comparing unit digital control unit, described common-mode extraction buffer cell is sent to described first energy comparing unit and described low-pass filter unit with the entire spectrum energy of an input signal of described equalizer output, and the common-mode signal of extracting a described input signal is to the described second energy comparing unit, described first energy comparing unit output one characterizes the current signal of high-frequency energy to described current comparator, the current signal that described second energy comparing unit output one characterizes low frequency energy is to described current comparator, and described digital control unit is used to control the balanced control signal of equalizer progression to described equalizer according to the comparative result output one of described current comparator output.
Preferably, described common-mode extraction buffer cell is sent to the entire spectrum energy of input signal one normal phase input end of described low-pass filter unit and the described first energy comparing unit, behind the described low-pass filter unit filtering high spectrum energy low frequency spectrum energy is sent to an inverting input of the described first energy comparing unit and a normal phase input end of the described second energy comparing unit, described common-mode extraction buffer cell extracts the inverting input of the common-mode signal of input signal to the described second energy comparing unit.
Preferably, the current signal of described sign high-frequency signal exports a normal phase input end of described current comparator to by an output of the described first energy comparing unit, and the current signal of described sign low frequency signal is exported to an inverting input of described current comparator by an output of the described second energy comparing unit.
Preferably, described Adaptive Equalization System also comprises a signal source selected cell, one first input end of described signal source selected cell is used to receive an ideal signal with ideal waveform, one second input of described signal source selected cell is used to receive described input signal, and described input signal is the signal once long-distance transmission back distortion.
Preferably, one first output of described signal source selected cell links to each other with described common-mode extraction buffer cell, one second output of described signal source selected cell links to each other with described equalizer, and described digital control unit output one selects signal to described signal source selected cell.
Preferably, described signal source selected cell switches described ideal signal of input and described input signal according to the selection signal of described digital control unit output, when the input ideal signal, described signal source selected cell directly is sent to described common-mode extraction buffer cell with ideal signal, when the input input signal, described signal source selected cell is sent to described equalizer with input signal.
Preferably, when described Adaptive Equalization System receives a reset signal, described digital control unit is exported one first and is selected signal to described signal source selected cell, make ideal signal input to described common-mode extraction buffer cell, described common-mode extraction buffer cell produces the entire spectrum energy of described ideal signal, an and common mode signal of extraction ideal signal, described digital control unit produces the bandwidth that an initialization control signal is controlled described low-pass filter unit, when the high-frequency energy of ideal signal equated with low frequency energy, the initial configuration of described low-pass filter unit was finished.
Preferably, after the initial configuration of described low-pass filter unit is finished, described digital control unit is exported one second and is selected signal to described signal source selected cell, make input signal input to described equalizer, described digital control unit makes the high-frequency energy of input signal equate with low frequency energy by regulating described equalizer.
The loss of signal spectrum component on transmission medium in the compensated high-speed signal transmission system automatically of relative prior art, the utility model Adaptive Equalization System, simple in structure, reduced power consumption, area and the manufacturing cost of chip.
Description of drawings
Fig. 1 is the system block diagram of the utility model Adaptive Equalization System better embodiment.
Fig. 2 is the system block diagram of the utility model Adaptive Equalization System better embodiment initial work state.
Fig. 3 is the system block diagram of the utility model Adaptive Equalization System better embodiment normal operating conditions.
Embodiment
See also Fig. 1, the utility model Adaptive Equalization System better embodiment comprises that common-mode extraction buffer cell, that a signal source selected cell, connects the equalizer of this signal source selected cell, and connects this equalizer connects the low-pass filter unit of this common-mode extraction buffer cell, the one first energy comparing unit, the one second energy comparing unit, that connect this low-pass filter unit respectively connects this first energy comparing unit is connected this current comparator with the current comparator and of this second energy comparing unit digital control unit.
One first input end of this signal source selected cell links to each other with an ideal signal end, one second input links to each other with an input signal end, one first output of this signal source selected cell links to each other with the input of this common-mode extraction buffer cell, and one second output links to each other with the input of this equalizer.The output of this equalizer links to each other with the input of this common-mode extraction buffer cell.One first output of this common-mode extraction buffer cell links to each other with a normal phase input end of the input of this low-pass filter unit and this first energy comparing unit, and one second output links to each other with an inverting input of this second energy comparing unit.The output of this low-pass filter unit links to each other with an inverting input of the first energy comparing unit and a normal phase input end of the second energy comparing unit respectively.The output of this first energy comparing unit links to each other with a normal phase input end of this current comparator, the output of this second energy comparing unit links to each other with an inverting input of this current comparator, and the output of this current comparator links to each other with this digital control unit input.The output of this digital control unit links to each other with this signal source selected cell, this equalizer and this low-pass filter unit respectively.
This signal source selected cell switches the signal of this ideal signal end and the input of this input signal end according to the signal of this digital control unit output, when ideal signal end input signal, this signal source selected cell directly is sent to this common-mode extraction buffer cell with the signal of ideal signal end input; When input signal end input signal, this signal source selected cell is sent to this equalizer with the signal of this input signal end input.
This equalizer is adjusted the loss of compensating signal spectrum component on transmission medium according to the signal of this digital control unit output to the signal of the distortion of input signal end input.This common-mode extraction buffer cell is used to produce the entire spectrum energy of input signal, is sent to the normal phase input end of the low-pass filter unit and the first energy comparing unit, and extracts the inverting input of common mode signal to the second an energy comparing unit.This low-pass filter unit is used for the high spectrum energy that filtering receives, and the low frequency spectrum energy is sent to the inverting input of the first energy comparing unit and the normal phase input end of the second energy comparing unit.This first energy comparing unit compares the normal phase input end of the current signal of back output one sign high-frequency energy to current comparator to the signal energy of input, and this second energy comparing unit compares back output one to the signal energy of importing and characterizes the inverting input of the current signal of low frequency energy to current comparator.This current comparator outputs signal to digital control unit after the size of current of current signal of input is compared.Balanced control signal to the equalizer and that this digital control unit output one selection signal to signal source selected cell, that is used for the switched system mode of operation is used to control equalizer progression is used to control the initialization control signal of bandwidth of low-pass filter unit to low-pass filter unit.
The utility model Adaptive Equalization System is started working after receiving a reset signal, at first digital control unit enters the initial work state by signal source selected cell control system, treat successfully initialization after digital control unit by the signal source selected cell system is switched to normal operating conditions.
See also Fig. 2, Fig. 2 is the system block diagram of the utility model Adaptive Equalization System better embodiment initial work state.After this Adaptive Equalization System receives reset signal, this digital control unit is exported one first and is selected signal to the signal source selected cell, make this ideal signal end input one have the ideal signal of ideal waveform to this common-mode extraction buffer cell, this common-mode extraction buffer cell exports the entire spectrum energy of ideal signal to low-pass filter unit, and the inverting input of extraction common-mode signal to the second energy comparing unit, the inverting input of this low-pass filter unit output low frequency spectrum energy to the first energy comparing unit and the normal phase input end of the second energy comparing unit, this first energy comparing unit output one characterizes the normal phase input end of the current signal of high-frequency energy to current comparator, this second energy comparing unit output one characterizes the inverting input of the current signal of low frequency energy to current comparator, this current comparator is the size of current of two current signals relatively, and the result delivered to digital control unit, this digital control unit produces the bandwidth that initialization control signal is controlled low-pass filter unit, two size of current importing up to the input of current comparator equate, be that the high-frequency energy of signal is when equating with low frequency energy, the initial configuration of low-pass filter unit is finished, the state of this moment is locked, and enters normal operating conditions.
See also Fig. 3, Fig. 3 is the system block diagram of the utility model Adaptive Equalization System better embodiment normal operating conditions.After the initial work state is finished, this digital control unit is exported one second and is selected signal to the signal source selected cell, make this input signal end import the signal of distortion after the long-distance transmission to equalizer, equalizer carries out being sent to the common-mode extraction buffer cell after the amplification filtering to the signal of distortion, this common-mode extraction buffer cell exports the entire spectrum energy of distorted signal to low-pass filter unit, and extract the inverting input of common mode signal to the second an energy comparing unit, the inverting input of this low-pass filter unit output low frequency spectrum energy to the first energy comparing unit and the normal phase input end of the second energy comparing unit, this first energy comparing unit output characterizes the normal phase input end of the current signal of high-frequency energy to current comparator, this second energy comparing unit output characterizes the inverting input of the current signal of low frequency energy to current comparator, this current comparator is the size of current of two current signals relatively, and the result delivered to digital control unit, this digital control unit output is used to control the balanced control signal of equalizer progression to equalizer, by regulating equalizer the high-frequency energy of signal is equated with low frequency energy, thereby make that the signal of distortion is well recovered, equalizer configuration is finished, after this equalizer configuration state is locked, and system works is in normal condition.
In another embodiment, the signal of the distortion of ideal signal and input all can directly export this common-mode extraction buffer cell to by equalizer, promptly after this Adaptive Equalization System receives reset signal, this ideal signal end has the ideal signal of ideal waveform to this common-mode extraction buffer cell by this equalizer input one, after initial chemical industry is finished, the signal of this input signal end input distortion after long Distance Transmission is to equalizer, and equalizer carries out being sent to the common-mode extraction buffer cell after the amplification filtering to the signal of distortion.
The loss of signal spectrum component on transmission medium in the compensated high-speed signal transmission system automatically of the utility model Adaptive Equalization System, simple in structure, reduced power consumption, area and the manufacturing cost of chip.
Claims (8)
1. Adaptive Equalization System, it is characterized in that: described Adaptive Equalization System comprises an equalizer, one connects the common-mode extraction buffer cell of described equalizer, one connects the low-pass filter unit of described common-mode extraction buffer cell, one connects the first energy comparing unit of described low-pass filter unit, one connects the second energy comparing unit of described low-pass filter unit, one connects the described first energy comparing unit is connected described current comparator and described equalizer with the current comparator and of the described second energy comparing unit digital control unit, described common-mode extraction buffer cell is sent to described first energy comparing unit and described low-pass filter unit with the entire spectrum energy of an input signal of described equalizer output, and the common-mode signal of extracting a described input signal is to the described second energy comparing unit, described first energy comparing unit output one characterizes the current signal of high-frequency energy to described current comparator, the current signal that described second energy comparing unit output one characterizes low frequency energy is to described current comparator, and described digital control unit is used to control the balanced control signal of equalizer progression to described equalizer according to the comparative result output one of described current comparator output.
2. Adaptive Equalization System as claimed in claim 1, it is characterized in that: described common-mode extraction buffer cell is sent to the entire spectrum energy of input signal one normal phase input end of described low-pass filter unit and the described first energy comparing unit, behind the described low-pass filter unit filtering high spectrum energy low frequency spectrum energy is sent to an inverting input of the described first energy comparing unit and a normal phase input end of the described second energy comparing unit, described common-mode extraction buffer cell extracts the inverting input of the common-mode signal of input signal to the described second energy comparing unit.
3. Adaptive Equalization System as claimed in claim 2, it is characterized in that: the current signal of described sign high-frequency signal exports a normal phase input end of described current comparator to by an output of the described first energy comparing unit, and the current signal of described sign low frequency signal is exported to an inverting input of described current comparator by an output of the described second energy comparing unit.
4. Adaptive Equalization System as claimed in claim 1, it is characterized in that: described Adaptive Equalization System also comprises a signal source selected cell, one first input end of described signal source selected cell is used to receive an ideal signal with ideal waveform, one second input of described signal source selected cell is used to receive described input signal, and described input signal is the signal once long-distance transmission back distortion.
5. Adaptive Equalization System as claimed in claim 4, it is characterized in that: one first output of described signal source selected cell links to each other with described common-mode extraction buffer cell, one second output of described signal source selected cell links to each other with described equalizer, and described digital control unit output one selects signal to described signal source selected cell.
6. Adaptive Equalization System as claimed in claim 5, it is characterized in that: described signal source selected cell switches described ideal signal of input and described input signal according to the selection signal of described digital control unit output, when the input ideal signal, described signal source selected cell directly is sent to described common-mode extraction buffer cell with ideal signal, when the input input signal, described signal source selected cell is sent to described equalizer with input signal.
7. Adaptive Equalization System as claimed in claim 6, it is characterized in that: when described Adaptive Equalization System receives a reset signal, described digital control unit is exported one first and is selected signal to described signal source selected cell, make ideal signal input to described common-mode extraction buffer cell, described common-mode extraction buffer cell produces the entire spectrum energy of described ideal signal, an and common mode signal of extraction ideal signal, described digital control unit produces the bandwidth that an initialization control signal is controlled described low-pass filter unit, when the high-frequency energy of ideal signal equated with low frequency energy, the initial configuration of described low-pass filter unit was finished.
8. Adaptive Equalization System as claimed in claim 7, it is characterized in that: after the initial configuration of described low-pass filter unit is finished, described digital control unit is exported one second and is selected signal to described signal source selected cell, make input signal input to described equalizer, described digital control unit makes the high-frequency energy of input signal equate with low frequency energy by regulating described equalizer.
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| CN2010202897127U CN201717880U (en) | 2010-08-12 | 2010-08-12 | Adaptive equalization system |
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| CN2010202897127U CN201717880U (en) | 2010-08-12 | 2010-08-12 | Adaptive equalization system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116886205A (en) * | 2023-09-07 | 2023-10-13 | 成都明夷电子科技有限公司 | Self-adaptive equalization system for PAM4 optical receiver |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116886205A (en) * | 2023-09-07 | 2023-10-13 | 成都明夷电子科技有限公司 | Self-adaptive equalization system for PAM4 optical receiver |
| CN116886205B (en) * | 2023-09-07 | 2023-11-28 | 成都明夷电子科技有限公司 | Self-adaptive equalization system for PAM4 optical receiver |
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| C14 | Grant of patent or utility model | ||
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| CP02 | Change in the address of a patent holder |
Address after: 610041 Sichuan city of Chengdu province high tech Zone Kyrgyzstan Road 33 block A No. 9 Patentee after: IPGoal Microelectronics (Sichuan) Co., Ltd. Address before: 402 room 7, building 610041, incubator Park, hi tech Zone, Sichuan, Chengdu Patentee before: IPGoal Microelectronics (Sichuan) Co., Ltd. |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110119 Termination date: 20130812 |