CN112702291B - Adaptive equalizer and adjusting range expanding method thereof - Google Patents
Adaptive equalizer and adjusting range expanding method thereof Download PDFInfo
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- CN112702291B CN112702291B CN202011552988.4A CN202011552988A CN112702291B CN 112702291 B CN112702291 B CN 112702291B CN 202011552988 A CN202011552988 A CN 202011552988A CN 112702291 B CN112702291 B CN 112702291B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
- H04L25/03019—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03878—Line equalisers; line build-out devices
- H04L25/03885—Line equalisers; line build-out devices adaptive
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Abstract
The invention provides a self-adaptive equalizer and an adjusting range expanding method thereof, comprising a signal input port, an equalizer, an amplitude limiting comparator, an energy comparator, a signal output port and a coarse adjustment control device; the input signal is input into the equalizer through the signal input port, then is converted into a square wave signal through the amplitude limiting comparator, and then is output through the signal output port; meanwhile, the output of the equalizer and the output of the amplitude limiting comparator are compared by using an energy comparator, and the equalizer and the amplitude limiting comparator are finely adjusted according to a comparison result; meanwhile, the output of the equalizer and the output of the amplitude limiting comparator are analyzed through the coarse adjustment control device, and then the amplitude limiting comparator is subjected to coarse adjustment according to an analysis result, so that the adjustment range of the self-adaptive equalizer is expanded, and the aim of expanding the adjustment range of the conventional self-adaptive equalizer by adopting a simpler control module is fulfilled.
Description
Technical Field
The invention relates to the technical field of equalizers, in particular to an adaptive equalizer and an adjustment range expansion method of the adaptive equalizer.
Background
At present, the input signal of the existing adaptive equalizer based on an energy comparison mode is subjected to the amplification of a high-frequency signal by the equalizer to obtain an output signal of the equalizer, and is converted into a square wave signal through amplitude limiting comparison, and the output signal of the equalizer is subjected to energy comparison with the square wave signal to judge the state of the equalization gain at the moment; if the output energy of the equalizer is low, the equalization gain is low at this time, and the gain of the equalizer should be increased by the control signal, and the amplitude of the amplitude limiting comparison output is reduced. However, in order to stabilize the loop operation, the gain of the control signal to the equalizer gain and the amplitude of the amplitude-limiting comparison cannot be too high, which affects the adjustment range. It is desirable to provide a scheme to extend the adjustment range of an adaptive equalizer.
Disclosure of Invention
The invention aims to provide an adaptive equalizer and an adjusting range expanding method of the adaptive equalizer, which are used for realizing the technical effect of expanding the adjusting range of the adaptive equalizer.
In a first aspect, the present invention provides an adaptive equalizer, including a signal input port, an equalizer, a limiting comparator, an energy comparator, a signal output port, and a coarse adjustment control device; the input end of the equalizer is connected with the signal input port; the input end of the amplitude limiting comparator is connected with the output end of the equalizer; the output end of the amplitude limiting comparator is connected with the signal output port; the first input end of the energy comparator and the first input end of the coarse adjustment control device are both connected with the output end of the equalizer; the second input end of the energy comparator and the second input end of the coarse adjustment control device are both connected with the output end of the amplitude limiting comparator; the control end of the equalizer and the control end of the amplitude limiting comparator are both connected with the output end of the energy comparator, and meanwhile, the output end of the coarse adjustment control device is connected with the control end of the amplitude limiting comparator.
Optionally, the coarse adjustment control device includes a first reference voltage input port, a first rectifier, a first low-pass filter, a first comparator, a first timer, and a first counter; the output signal of the equalizer and the output signal of the amplitude limiting comparator are rectified by the first rectifier and then are transmitted to the first low-pass filter to obtain respective corresponding filtering signals; the first comparator compares two filtering signals output by the first low-pass filter by taking the voltage input by the first reference voltage input port as a reference voltage, and outputs high and low levels according to a comparison result; the first timer is used for transmitting a corresponding counting signal to the first counter according to the high and low levels; the first counter is used for transmitting a corresponding adjusting signal to the amplitude limiting comparator according to the counting signal; the first timer is further configured to reset according to a set first timing threshold and send a first indication signal to the first comparator, and the first comparator updates a state according to the first indication signal.
Optionally, the coarse adjustment control device includes a peak detector, a second reference voltage input port, a second comparator, a second timer, and a second counter; the peak value detector is used for carrying out energy detection on the output signal of the equalizer and the output signal of the amplitude limiting comparator to obtain detection signals corresponding to the two output signals; the second comparator compares the two detection signals by taking the voltage input by the second reference voltage input port as a reference voltage and outputs high and low levels according to a comparison result; the second timer is used for transmitting a corresponding counting signal to the second counter according to the high and low level; the second counter is used for transmitting a corresponding adjusting signal to the amplitude limiting comparator according to the counting signal; the second timer is further configured to reset according to a set second timing threshold and send a second indication signal to the second comparator, and the second comparator updates the state according to the second indication signal.
In a second aspect, the present invention provides an adaptive equalizer, including a signal input port, an equalizer, a clipping comparator, an energy comparator, a signal output port, and a coarse adjustment control device; the input end of the equalizer is connected with the signal input port; the input end of the amplitude limiting comparator is connected with the output end of the equalizer; the output end of the amplitude limiting comparator is connected with the signal output port; the first input end of the energy comparator is connected with the output end of the equalizer; the second input end of the energy comparator is connected with the output end of the amplitude limiting comparator; the control end of the equalizer and the control end of the amplitude limiting comparator are both connected with the output end of the energy comparator; the energy comparator further comprises a first intermediate signal output and a second intermediate signal output; a first input end of the coarse adjustment control device is connected with the first intermediate signal output end; a second input end of the coarse adjustment control device is connected with the second intermediate signal output end; and the output end of the coarse adjustment control device is connected with the control end of the amplitude limiting comparator.
Optionally, the energy comparator comprises a second rectifier, a second low pass filter and a subtractor; the output signal of the equalizer and the output signal of the amplitude limiting comparator are rectified by the second rectifier and then are transmitted to the second low-pass filter to obtain respective corresponding filtering signals; the subtracter carries out subtraction processing on the two filtering signals output by the second low-pass filter and then transmits corresponding adjusting signals to the equalizer and the limiting comparator; and simultaneously inputting two filtering signals output by the second low-pass filter as intermediate signals into the coarse adjustment control device.
Optionally, the coarse adjustment control device includes a third reference voltage input port, a third comparator, a third timer, and a third counter; the third comparator compares the two filtering signals output by the second low-pass filter by taking the voltage input by the third reference voltage input port as a reference voltage, and outputs high and low levels according to a comparison result; the third timer is used for transmitting a corresponding counting signal to the third counter according to the high and low level; the third counter is used for transmitting a corresponding adjusting signal to the amplitude limiting comparator according to the counting signal; the third timer is further configured to reset according to a set third timing threshold and send a third indication signal to the third comparator, and the third comparator updates the state according to the third indication signal.
In a third aspect, the present invention provides a method for extending an adjustment range of an adaptive equalizer, which is applied to the adaptive equalizer and includes:
the method comprises the steps that an equalizer acquires an input signal of a signal input port and amplifies a high-frequency signal in the input signal to obtain an equalizer output signal;
the amplitude limiting comparator converts the output signal of the equalizer into a square wave signal and outputs the square wave signal from a signal output port;
the energy comparator compares the energy of the output signal of the equalizer with the energy of the square wave signal, judges the current equalization gain state, sends a corresponding control signal according to the equalization gain state to adjust the gain of the equalizer and the gain of the amplitude limiting comparator, and updates the square wave signal output by the amplitude limiting comparator;
and the rough adjustment control device compares the output signal of the equalizer with the square wave signal, adjusts the gain of the amplitude limiting comparator according to the change of the comparison result, and updates the square wave signal output by the amplitude limiting comparator again.
Optionally, the adjusting the gain of the clipping comparator according to the change of the comparison result includes: if the output signal of the equalizer is smaller than the square wave signal, the coarse adjustment control device reduces the coarse adjustment configuration by a minimum step; if the equalizer output signal is greater than the square wave signal by a reference signal, the coarse adjustment control device increases the coarse adjustment configuration by a minimum step.
Optionally, the coarse adjustment control means comprises a comparator; a timer connected to the comparator; and a counter connected to the timer; the method further comprises the following steps: and updating the state of the comparator according to the timing threshold value set by the timer.
Optionally, the timing threshold is set to be 3-5 times a time constant of a loop in which the energy comparator is located.
The beneficial effects that the invention can realize are as follows: the self-adaptive equalizer provided by the invention uses the energy comparator to compare the output of the equalizer with the output of the amplitude limiting comparator, then finely adjusts the equalizer and the amplitude limiting comparator through the comparison result, simultaneously analyzes the output of the equalizer and the output of the amplitude limiting comparator through the coarse adjustment control device, and coarsely adjusts the amplitude limiting comparator according to the analysis result, and can expand the adjustment range of the existing self-adaptive equalizer by adopting a simpler control module.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic diagram of a first adaptive equalizer topology according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a first coarse adjustment control apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a second coarse adjustment control apparatus according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a second adaptive equalizer topology according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating an implementation of a third coarse adjustment control apparatus according to an embodiment of the present invention;
fig. 6 is a flowchart illustrating an adjustment range expanding method of an adaptive equalizer according to an embodiment of the present invention.
Icon: 10-an adaptive equalizer; 100-a signal input port; 200-an equalizer; 300-a clipping comparator; 400-an energy comparator; 500-a signal output port; 600-coarse adjustment control means.
Detailed Description
The technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not construed as indicating or implying relative importance.
Referring to fig. 1, fig. 1 is a schematic diagram of a first adaptive equalizer topology according to an embodiment of the present invention.
The adaptive equalizer 10 provided by the embodiment of the present invention includes a signal input port 100, an equalizer 200, a limiting comparator 300, an energy comparator 400, a signal output port 500, and a coarse adjustment control device 600; the input end of the equalizer 200 is connected to the signal input port 100; the input terminal of the clipping comparator 300 is connected to the output terminal of the equalizer 200; the output end of the limiting comparator 300 is connected with the signal output port 500; a first input terminal of the energy comparator 400 and a first input terminal of the coarse adjustment control device 600 are both connected to an output terminal of the equalizer 200; a second input terminal of the energy comparator 400 and a second input terminal of the coarse adjustment control device 600 are both connected to the output terminal of the clipping comparator 300; the control terminal of the equalizer 200 and the control terminal of the clipping comparator 300 are both connected to the output terminal of the energy comparator 400, while the output terminal of the coarse adjustment control means 600 is connected to the control terminal of the clipping comparator 300.
In the implementation process, the output of the equalizer 200 and the output of the clipping comparator 300 are compared by the energy comparator 400, and then the equalizer 200 and the clipping comparator 300 are finely adjusted by the comparison result; meanwhile, the output of the equalizer 200 and the output of the amplitude limiting comparator 300 are analyzed by the coarse adjustment control device 600, and then the amplitude limiting comparator 300 is coarsely adjusted according to the analysis result, so that the adjustment range of the conventional adaptive equalizer 10 can be expanded by adopting a simpler control module.
Referring to fig. 2, fig. 2 is a schematic diagram of an implementation manner of a first coarse adjustment control device according to an embodiment of the present invention.
In one implementation, the coarse adjustment control device 600 provided by the embodiment of the present invention includes a first reference voltage input port (REF1), a first rectifier, a first low-pass filter, a first comparator, a first timer, and a first counter; the output signal of the equalizer 200 and the output signal of the amplitude-limiting comparator 300 are rectified by a first rectifier and then transmitted to a first low-pass filter to obtain respective corresponding filtered signals; the first comparator compares two filtering signals output by the first low-pass filter by taking the voltage input by the first reference voltage input port as a reference voltage, and outputs high and low levels according to a comparison result; the first timer is used for transmitting corresponding counting signals to the first counter according to the high and low levels; the first counter is used for transmitting a corresponding adjusting signal to the amplitude limiting comparator 300 according to the counting signal; the first timer is further used for resetting according to the set first timing threshold value and sending a first indication signal to the first comparator, and the first comparator updates the state according to the first indication signal.
Specifically, a first input of the first rectifier is connected with an output of the equalizer 200; a second input terminal of the first rectifier is connected with an output terminal of the clipping comparator 300; the first input end of the first low-pass filter is connected with the first output end of the first rectifier; the second input end of the first low-pass filter is connected with the second output end of the first rectifier; the first input end of the first comparator is connected with the first output end of the first low-pass filter; the second input end of the first comparator is connected with the second output end of the first low-pass filter; the reference voltage input end of the first comparator is connected with the first reference voltage input port; the input end of the first timer is connected with the output end of the first comparator; the first output end of the first timer is connected with the first input end of the first counter; the second output end of the first timer is connected with the second input end of the first counter; the output end of the first counter is connected with the control end of the amplitude limiting comparator 300; and a control signal output pin of the first timer is connected with a control pin of the first comparator.
In the implementation process, the output of the equalizer 200 and the output of the clipping comparator 300 are compared by the comparator after passing through the rectifier and the low-pass filter, and when the signal output by the equalizer is smaller than the signal output by the clipping comparator (i.e. the energy of the output signal of the equalizer is smaller than the square wave signal of the clipping comparator), the first comparator outputs a low level (logic 0, which represents that the equalization gain is smaller, i.e. "under-equalization"); when the energy of the equalizer output signal is larger than the energy of the square wave signal of the limiting comparator by one reference signal, a high level (logic 1, which represents that the equalizing gain is larger, namely, over-equalizing) is output. In this way, the comparator may provide some hysteresis to avoid the loop switching frequently between the two coarse adjustment configurations.
Referring to fig. 3, fig. 3 is a schematic diagram of an implementation manner of a second coarse adjustment control device according to an embodiment of the present invention.
In one implementation, the coarse adjustment control apparatus provided by the embodiment of the present invention includes a peak detector, a second reference voltage input port (REF2), a second comparator, a second timer, and a second counter; the peak detector is configured to perform energy detection on the output signal of the equalizer 200 and the output signal of the amplitude-limiting comparator 300 to obtain detection signals corresponding to the two output signals; the second comparator compares the two detection signals by taking the voltage input by the second reference voltage input port as a reference voltage and outputs high and low levels according to a comparison result; the second timer is used for transmitting corresponding counting signals to the second counter according to the high and low levels; the second counter is used for transmitting a corresponding adjusting signal to the amplitude limiting comparator 300 according to the counting signal; the second timer is also used for resetting according to the set second timing threshold value and sending a second indication signal to the second comparator, and the second comparator updates the state according to the second indication signal.
Specifically, a first input of the peak detector is connected to an output of the equalizer 200; the second input end of the peak value detector is connected with the output end of the amplitude limiting comparator; a reference voltage input pin of the second comparator is connected with a second reference voltage input port; a first input end of the second comparator is connected with a first output end of the peak detector; a second input end of the second comparator is connected with a second output end of the peak detector; the input end of the second timer is connected with the output end of the second comparator; the first output end of the second timer is connected with the first input end of the second counter; a second output end of the second timer is connected with a second input end of the second counter; the output end of the second counter is connected with the control end of the amplitude limiting comparator 300; and a control signal output pin of the second timer is connected with a control pin of the second comparator.
In the implementation process, the invention can judge the energy of the output signal of the equalizer and the output signal of the amplitude-limiting comparator through the peak value detector so as to determine the loop adjustment direction.
Referring to fig. 4 and fig. 5, fig. 4 is a schematic diagram of a second adaptive equalizer topology according to an embodiment of the present invention; fig. 5 is a schematic diagram of an implementation manner of a third coarse adjustment control device according to an embodiment of the present invention.
In one implementation, the adaptive equalizer 10 provided in the embodiment of the present invention includes a signal input port 100, an equalizer 200, a clipping comparator 300, an energy comparator 400, a signal output port 500, and a coarse adjustment control device 600; the input end of the equalizer 200 is connected to the signal input port 100; the input terminal of the clipping comparator 300 is connected to the output terminal of the equalizer 200; the output end of the limiting comparator 300 is connected with the signal output port 500; a first input of the energy comparator 400 is connected to an output of the equalizer 200; a second input of the energy comparator 400 is connected to the output of the clipping comparator 300; the control terminal of the equalizer 200 and the control terminal of the clipping comparator 300 are both connected to the output terminal of the energy comparator 400; the energy comparator 400 further comprises a first intermediate signal output (L1) and a second intermediate signal output (L2); a first input of the coarse adjustment control device 600 is connected to a first intermediate signal output (L1); a second input of the coarse adjustment control device 600 is connected to a second intermediate signal output (L2); the output of the coarse adjustment control means 600 is connected to the control terminal of the clipping comparator 300.
Wherein the energy comparator 400 comprises a second rectifier, a second low-pass filter and a subtractor; the output signal (a) of the equalizer and the output signal of the amplitude limiting comparator are rectified by a second rectifier and then are transmitted to a second low-pass filter to obtain respective corresponding filtering signals; the subtracter performs subtraction processing on the two filtering signals output by the second low-pass filter and then transmits corresponding adjusting signals to the equalizer and the limiting comparator; and simultaneously inputting two filtering signals output by the second low-pass filter as intermediate signals into the coarse adjustment control device.
Specifically, a first input end of the second rectifier is connected with an output end of the equalizer; the second input end of the second rectifier is connected with the output end of the amplitude limiting comparator; the first input end of the second low-pass filter is connected with the first output end of the second rectifier; the second input end of the second low-pass filter is connected with the second output end of the second rectifier; the first input end and the first intermediate signal output end of the subtracter are both connected with the first output end of the second low-pass filter; the second input end and the second intermediate signal output end of the subtracter are both connected with the second output end of the second low-pass filter; and the control end of the equalizer and the control end of the amplitude limiting comparator are both connected with the output end of the subtracter.
Further, the coarse adjustment control means 600 includes a third reference voltage input port (REF3), a third comparator, a third timer, and a third counter; the third comparator compares the two filtering signals output by the second low-pass filter by taking the voltage input by the third reference voltage input port as a reference voltage, and outputs high and low levels according to a comparison result; the third timer is used for transmitting a corresponding counting signal to the third counter according to the high and low levels; the third counter is used for transmitting a corresponding adjusting signal to the amplitude limiting comparator according to the counting signal; the third timer is also used for resetting according to the set third timing threshold value and sending a third indication signal to the third comparator, and the third comparator updates the state according to the third indication signal.
Specifically, a reference voltage input terminal of the third comparator is connected to the third reference voltage input port; the first input end of the third comparator is connected with the first intermediate signal output end; the second input end of the third comparator is connected with the second intermediate signal output end; the input end of the third timer is connected with the output end of the third comparator; the first output end of the third timer is connected with the first input end of the third counter; the second output end of the third timer is connected with the second input end of the third timer; the output end of the third counter is connected with the control end of the amplitude limiting comparator; a control signal output pin of the third timer is connected with a control pin of the third comparator; and when the third timer reaches a second set threshold value, resetting and sending a second indication signal to a control pin of the third comparator to control the third comparator to update the state.
In this embodiment, the output signal of the equalizer 200 and the square wave signal of the limiting comparator 300 are first input to the low pass filter of the energy comparator to obtain the corresponding output filtered signal, and then the output filtered signal is provided to the coarse adjustment control device as the input signal, and the output filtered signal is first sent to the comparator of the coarse adjustment control device to determine the current state of the equalizing gain. If the output signal of the equalizer corresponding to the output filtering signal is smaller than the square wave signal of the amplitude limiting comparator, the comparator outputs a low level (logic 0, which represents that the equalizing gain is smaller, namely, under-equalization); if the energy of the corresponding equalizer output signal in the output filtering signal is larger than the energy of the square wave signal of the amplitude limiting comparator by one reference signal, a high level (logic 1, which represents that the equalizing gain is larger, namely, over-equalization) is output. In this way, the comparator may provide some hysteresis to avoid the loop switching frequently between the two coarse adjustment configurations.
In the execution process, the jump edge output by the comparator can be used as a starting point, and when the accumulated time of the timer reaches a certain set timing threshold value, a +1 signal is output at a +1 port of the timer or a-1 signal is output at a-1 port of the timer and enters a counter. The timer outputs a-1 signal when the comparator output signal is "0" (the under-equalized state should reduce the amplitude of the clipping comparator) and outputs a +1 signal when the comparator output signal is "1" (the over-equalized state should increase the amplitude of the clipping comparator). When the time of the timer reaches the threshold value, the state of the timer is reset, and an indication signal is output to the comparator at the same time, so that the situation that the adjustment cannot be continued because the comparator is always in the same state is avoided.
The function of the counter is to count the output transition edges of the timer and output the corresponding coarse adjustment configuration. When the timer sends a-1 signal (i.e., "underbalanced"), the counter state-1 and lowers the coarse adjustment configuration by one minimum step; when the timer sends a +1 signal (i.e., "over-equalization"), the counter state +1 and increases the coarse adjustment configuration by one minimum step.
In the implementation process, the coarse adjustment control device utilizes the rectifier and the low-pass filter of the energy comparator, so that the adjustment range of the self-adaptive equalizer is enlarged, the hardware structure is simplified, and the power consumption and the cost are reduced.
Referring to fig. 6, fig. 6 is a schematic flowchart of a method for extending an adjustment range of an adaptive equalizer according to an embodiment of the present invention.
In an implementation manner, an embodiment of the present invention further provides a method for extending an adjustment range of an adaptive equalizer, which is described in the following.
Step S101, an equalizer acquires an input signal of a signal input port and amplifies a high-frequency signal in the input signal to obtain an equalizer output signal.
And step S102, the amplitude limiting comparator converts the output signal of the equalizer into a square wave signal and outputs the square wave signal from a signal output port.
And step S103, the energy comparator compares the energy of the output signal of the equalizer with the energy of the square wave signal, judges the current equalization gain state, sends a corresponding control signal according to the equalization gain state to adjust the gain of the equalizer and the gain of the amplitude limiting comparator, and updates the square wave signal output by the amplitude limiting comparator.
And step S104, comparing the output signal of the equalizer with the square wave signal by the coarse adjustment control device, adjusting the gain of the amplitude limiting comparator according to the change of the comparison result, and updating the square wave signal output by the amplitude limiting comparator again.
In one embodiment, in order to prevent the comparator in the coarse adjustment control device from being always in the same state, so that the adjustment cannot be continued, the method further includes: and updating the state of the comparator according to a timing threshold set by the timer.
Illustratively, to avoid false positives due to the loop not reaching steady state and to avoid coarse settling times being too long, the timing threshold may be set to 3-5 times the loop time constant of the energy comparator.
In summary, the embodiments of the present invention provide an adaptive equalizer and an adjustment range extension method for the adaptive equalizer, including a signal input port, an equalizer, a limiting comparator, an energy comparator, a signal output port, and a coarse adjustment control device; the input end of the equalizer is connected with the signal input port; the input end of the amplitude limiting comparator is connected with the output end of the equalizer; the output end of the amplitude limiting comparator is connected with the signal output port; the first input end of the energy comparator and the first input end of the coarse adjustment control device are both connected with the output end of the equalizer; the second input end of the energy comparator and the first input end of the coarse adjustment control device are both connected with the output end of the amplitude limiting comparator; the control end of the equalizer and the control end of the amplitude limiting comparator are both connected with the output end of the energy comparator, and the output end of the coarse adjustment control device is connected with the control end of the amplitude limiting comparator. By adopting the mode, the adjustment range of the existing self-adaptive equalizer can be expanded by adopting a simpler control module, and the cost and the power consumption are reduced.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and shall cover the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A method for extending an adjustment range of an adaptive equalizer, comprising:
the method comprises the steps that an equalizer acquires an input signal of a signal input port and amplifies a high-frequency signal in the input signal to obtain an equalizer output signal;
the amplitude limiting comparator converts the output signal of the equalizer into a square wave signal and outputs the square wave signal from a signal output port;
the energy comparator compares the energy of the output signal of the equalizer with the energy of the square wave signal, judges the current equalization gain state, sends a corresponding control signal according to the equalization gain state to adjust the gain of the equalizer and the gain of the amplitude limiting comparator, and adjusts the square wave signal output by the amplitude limiting comparator;
the coarse adjustment control device compares the equalizer output signal with the square wave signal and adjusts the gain of the amplitude limiting comparator according to the change of the comparison result, specifically, if the equalizer output signal is smaller than the square wave signal, the coarse adjustment control device reduces the coarse adjustment configuration by a minimum step carry; if the output signal of the equalizer is larger than the square wave signal by a reference signal, the coarse adjustment control device increases the coarse adjustment configuration by a minimum step; the square wave signal of the output of the clipping comparator is adjusted again.
2. The method of claim 1, wherein the coarse adjustment control device comprises a comparator; a timer connected to the comparator; and a counter connected to the timer; the method further comprises the following steps: and updating the state of the comparator according to the timing threshold value set by the timer.
3. The method of claim 2, wherein the timing threshold is 3-5 times a loop time constant of the energy comparator.
4. An adaptive equalizer to which the adjustment range extension method of the adaptive equalizer of any one of claims 1 to 3 is applied, comprising: the device comprises a signal input port, an equalizer, an amplitude limiting comparator, an energy comparator, a signal output port and a coarse adjustment control device; the input end of the equalizer is connected with the signal input port; the input end of the amplitude limiting comparator is connected with the output end of the equalizer; the output end of the amplitude limiting comparator is connected with the signal output port; the first input end of the energy comparator and the first input end of the coarse adjustment control device are both connected with the output end of the equalizer; the second input end of the energy comparator and the second input end of the coarse adjustment control device are both connected with the output end of the amplitude limiting comparator; the control end of the equalizer and the control end of the amplitude limiting comparator are both connected with the output end of the energy comparator, and meanwhile, the output end of the coarse adjustment control device is connected with the control end of the amplitude limiting comparator.
5. The adaptive equalizer of claim 4, wherein the coarse adjustment control means comprises a first reference voltage input port, a first rectifier, a first low pass filter, a first comparator, a first timer, and a first counter; the output signal of the equalizer and the output signal of the amplitude limiting comparator are rectified by the first rectifier and then are transmitted to the first low-pass filter to obtain respective corresponding filtering signals; the first comparator compares two filtering signals output by the first low-pass filter by taking the voltage input by the first reference voltage input port as a reference voltage, and outputs high and low levels according to a comparison result; the first timer is used for transmitting a corresponding counting signal to the first counter according to the high and low levels; the first counter is used for transmitting a corresponding adjusting signal to the amplitude limiting comparator according to the counting signal; the first timer is further configured to reset according to a set first timing threshold and send a first indication signal to the first comparator, and the first comparator updates a state according to the first indication signal.
6. The adaptive equalizer of claim 4, wherein the coarse adjustment control means comprises a peak detector, a second reference voltage input port, a second comparator, a second timer, and a second counter; the peak value detector is used for carrying out energy detection on the output signal of the equalizer and the output signal of the amplitude limiting comparator to obtain detection signals corresponding to the two output signals; the second comparator compares the two detection signals by taking the voltage input by the second reference voltage input port as a reference voltage and outputs high and low levels according to a comparison result; the second timer is used for transmitting a corresponding counting signal to the second counter according to the high and low level; the second counter is used for transmitting a corresponding adjusting signal to the amplitude limiting comparator according to the counting signal; the second timer is further configured to reset according to a set second timing threshold and send a second indication signal to the second comparator, and the second comparator updates the state according to the second indication signal.
7. An adaptive equalizer to which the adjustment range extension method of the adaptive equalizer of any one of claims 1 to 3 is applied, comprising: the device comprises a signal input port, an equalizer, an amplitude limiting comparator, an energy comparator, a signal output port and a coarse adjustment control device; the input end of the equalizer is connected with the signal input port; the input end of the amplitude limiting comparator is connected with the output end of the equalizer; the output end of the amplitude limiting comparator is connected with the signal output port; the first input end of the energy comparator is connected with the output end of the equalizer; the second input end of the energy comparator is connected with the output end of the amplitude limiting comparator; the control end of the equalizer and the control end of the amplitude limiting comparator are both connected with the output end of the energy comparator; the energy comparator further comprises a first intermediate signal output and a second intermediate signal output; a first input end of the coarse adjustment control device is connected with the first intermediate signal output end; a second input end of the coarse adjustment control device is connected with the second intermediate signal output end; and the output end of the coarse adjustment control device is connected with the control end of the amplitude limiting comparator.
8. The adaptive equalizer of claim 7, wherein the energy comparator comprises a second rectifier, a second low pass filter, and a subtractor; the output signal of the equalizer and the output signal of the amplitude limiting comparator are rectified by the second rectifier and then are transmitted to the second low-pass filter to obtain respective corresponding filtering signals; the subtracter carries out subtraction processing on the two filtering signals output by the second low-pass filter and then transmits corresponding adjusting signals to the equalizer and the limiting comparator; and simultaneously inputting two filtering signals output by the second low-pass filter as intermediate signals into the coarse adjustment control device.
9. The adaptive equalizer of claim 8, wherein the coarse adjustment control means comprises a third reference voltage input port, a third comparator, a third timer, and a third counter; the third comparator compares the two filtering signals output by the second low-pass filter by taking the voltage input by the third reference voltage input port as a reference voltage, and outputs high and low levels according to a comparison result; the third timer is used for transmitting a corresponding counting signal to the third counter according to the high and low level; the third counter is used for transmitting a corresponding adjusting signal to the amplitude limiting comparator according to the counting signal; the third timer is further configured to reset according to a set third timing threshold and send a third indication signal to the third comparator, and the third comparator updates a state according to the third indication signal.
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