CN101102160B - Threshold voltage adjusting unit, adjusting method, limit rage amplifier and optical receiver - Google Patents
Threshold voltage adjusting unit, adjusting method, limit rage amplifier and optical receiver Download PDFInfo
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- CN101102160B CN101102160B CN2007101188802A CN200710118880A CN101102160B CN 101102160 B CN101102160 B CN 101102160B CN 2007101188802 A CN2007101188802 A CN 2007101188802A CN 200710118880 A CN200710118880 A CN 200710118880A CN 101102160 B CN101102160 B CN 101102160B
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Abstract
The threshold voltage adjusting unit comprises: a feedback comparison module used for receiving the feedback quantity, and according to the variation of feedback quantity, determining the adjusting direction of the threshold voltage; a adjusting module used for getting the adjusted threshold voltage according to the adjusting direction of the threshold voltage and the adjusting step length; a D/A converter used for making D/A conversion for the threshold voltage and outputting the converted threshold. The invention can adjust the threshold voltage along with the variation of the signal and reduce the effects from noise to the threshold voltage so as to effectively reduce the error code rate.
Description
Technical field
The present invention relates to signal of telecommunication treatment technology, relate in particular to threshold voltage adjustment unit, method of adjustment, limiting amplifier and optical receiver.
Background technology
In communication system, because signal is mostly through long Distance Transmission and multistage amplification, signal to noise ratio can be lower and because the influence of transmission medium itself and environment also distorted signals can occur.For example, in optical communication system, through long-distance optical fiber transmission and multistage light amplification, signal to noise ratio can be lower mostly for the light signal of receiver side; Simultaneously because chromatic dispersion, nonlinear effect etc., make distorted signals.In order to obtain correct data, it is more crucial that processing to received signal seems like this.
Utilize amplitude limit to amplify carrying out the threshold value adjustment to the received signal is a kind of effective method.The operation principle that amplitude limit amplifies is, carries out linear amplification when the amplitude of input signal during less than certain value, carries out non-linear amplification during greater than this value, the amplitude of signal is amplified to the amplitude of logic level.Be to be reference point with the threshold voltage during amplification, positive and negative amplitude limit respectively is amplified to " 1 ", " 0 " logic level.Therefore, find the threshold voltage of amplitude limit amplification particularly important according to the signal that receives.
Existing a kind of method of adjusting threshold voltage is to detect the highest and minimum level of input signal, with the mean value of maximum level and minimum level as threshold voltage.But because the signal that receives is after long Distance Transmission, a lot of noises have superposeed on it, and be superimposed upon " 1 ", the noise on " 0 " logic level is also uneven, adopts the average of maximum level and minimum levels easily can cause higher bit error rate as threshold voltage.
Summary of the invention
The purpose of the embodiment of the invention is, threshold voltage adjustment unit, method of adjustment, limiting amplifier and optical receiver are provided, make threshold voltage can follow the variation of signal and adjust, reduce the influence of noise, thereby can effectively reduce the error rate threshold voltage.
To achieve these goals, the embodiment of the invention provides a kind of threshold voltage adjustment unit, comprise: the feedback comparison module is used to receive feedback quantity, and determines the adjustment direction of threshold voltage according to the variation of feedback quantity, described feedback quantity is the error rate of signal, the absolute number of error code, the error code number of level "0", the error code number of level"1", perhaps, the ratio of the error code number of the error code number of level "0" and level"1"; Adjusting module is used for obtaining adjusted threshold voltage according to the adjustment direction and the adjustment step-length of threshold voltage; D/A converter module is used for adjusted threshold voltage is carried out threshold voltage after digital-to-analogue conversion and the output conversion.
To achieve these goals, the embodiment of the invention also provides a kind of method for adjusting voltage threshold, comprise: receive feedback quantity, described feedback quantity is the error rate of signal, the absolute number of error code, the error code number of level "0", the error code number of level"1", perhaps, the ratio of the error code number of the error code number of level "0" and level"1"; Determine the adjustment direction of threshold voltage according to the variation of feedback quantity; Adjustment direction and adjustment step-length according to threshold voltage obtain adjusted threshold voltage; Adjusted threshold voltage is carried out threshold voltage after digital-to-analogue conversion and the output conversion.
To achieve these goals, the embodiment of the invention provides a kind of limiting amplifier again, comprise the amplitude limit amplifying unit, being used for according to threshold voltage the signal of importing being carried out amplitude limit amplifies, also comprise the threshold voltage adjustment unit, described threshold voltage adjustment unit comprises: the feedback comparison module, be used to receive feedback quantity, and determine the adjustment direction of threshold voltage according to the variation of feedback quantity, described feedback quantity is the error rate of signal, the absolute number of error code, the error code number of level "0", the error code number of level"1", perhaps, the ratio of the error code number of level "0" and the error code number of level"1"; Adjusting module is used for obtaining adjusted threshold voltage according to the adjustment direction and the adjustment step-length of threshold voltage; D/A converter module is used for adjusted threshold voltage is carried out threshold voltage after digital-to-analogue conversion and the output conversion.
To achieve these goals, the embodiment of the invention provides a kind of optical receiver again, comprise: photoelectric conversion unit, the prime amplifying unit, amplitude limit amplifying unit and back level processing unit, the threshold voltage adjustment unit, the light signal that described photoelectric conversion unit is used for receiving is converted to the signal of telecommunication, described prime amplifying unit is used for the signal of telecommunication that is converted to is amplified, described amplitude limit amplifying unit is used for carrying out the amplitude limit amplification according to threshold voltage to amplifying signal later, described back level processing unit is used for the signal of described amplitude limit amplifying unit output is carried out Timing Processing again, and signal carried out shaping, analyze, computing, described threshold voltage adjustment unit specifically comprises: the feedback comparison module, be used for determining the adjustment direction of threshold voltage according to the feedback quantity of back level processing unit output, described feedback quantity is the error rate of signal, the absolute number of error code, the error code number of level "0", the error code number of level"1", perhaps, the ratio of the error code number of the error code number of level "0" and level"1"; Adjusting module is used for obtaining adjusted threshold voltage according to the adjustment direction and the adjustment step-length of threshold voltage; D/A converter module is used for giving described amplitude limit amplifying unit to the threshold voltage that adjusted threshold voltage carries out after digital-to-analogue conversion and the output conversion.
The embodiment of the invention has realized that threshold voltage follows the variation of signal and adjust, and can reduce the influence of noise to threshold voltage, thereby can effectively reduce the error rate.
Below by drawings and Examples, the technical scheme of the embodiment of the invention is described in further detail.
Description of drawings
Fig. 1 is threshold voltage adjustment unit first structural representation of the embodiment of the invention;
Fig. 2 is the method for adjusting voltage threshold first pass figure of the embodiment of the invention;
Fig. 3 is threshold voltage adjustment unit second structural representation of the embodiment of the invention;
Fig. 4 is threshold voltage adjusting device the 3rd structural representation of the embodiment of the invention;
Fig. 5 is threshold voltage adjusting device the 4th structural representation of the embodiment of the invention;
Fig. 6 is method for adjusting voltage threshold second flow chart of the embodiment of the invention;
Fig. 7 is limiting amplifier one structural representation of the embodiment of the invention;
Fig. 8 is another structural representation of limiting amplifier of the embodiment of the invention;
Fig. 9 is the structural representation of the optical receiver of the embodiment of the invention.
Embodiment
As shown in Figure 1, be threshold voltage adjustment unit first structural representation of the embodiment of the invention, comprise feedback comparison module 11, adjusting module 12 and D/A converter module 13.Feedback comparison module 11 is used to receive feedback quantity, and determines the adjustment direction of threshold voltage according to the variation of feedback quantity, adjusts direction and shows threshold voltage to be increased and adjust step-length and still reduce to adjust step-length.Adjusting module 12 is used for according to the adjustment direction of threshold voltage and adjusts step-length obtaining adjusted threshold voltage.D/A converter module 13 is used for threshold voltage is carried out threshold voltage after digital-to-analogue conversion and the output conversion.
Feedback quantity can be the error rate of signal, the absolute number of error code, the error code number of level "0", the error code number of level"1", the parameters such as ratio of the error code number of level "0" and the error code number of level"1" can determine to adjust direction according to the variation of some or certain several parameter.For example, big if the error rate of feedback becomes when adopting the error rate as feedback quantity, then explanation should change the adjustment direction, if the error rate has diminished, then explanation is adjusted in the right directionly, can continue to regulate along this direction.For example, preceding once the adjustment is threshold voltage to be increased adjust step-length, if the feedback error rate becomes big, then this adjustment should be regulated in the other direction, and threshold voltage is reduced to adjust step-length; If the error rate has diminished, can continue to regulate along this direction, threshold voltage is increased adjust step-length.
Present embodiment has realized that the variation that makes threshold voltage can follow signal is in time adjusted according to feedback quantity real-time regulated threshold voltage, thereby can reduce to cause the influence to threshold voltage, effectively improves the precision of threshold voltage, and then can effectively reduce the error rate.
As shown in Figure 2, the method for adjusting voltage threshold first pass figure for the embodiment of the invention comprises the steps:
Steps A 1, reception feedback quantity;
Steps A 2, determine the adjustment direction of threshold voltage according to the variation of feedback quantity;
Steps A 3, according to the adjustment direction of threshold voltage and adjust step-length and obtain adjusted threshold voltage;
Steps A 4, threshold voltage is carried out threshold voltage after digital-to-analogue conversion and the output conversion.
Present embodiment is according to feedback quantity real-time regulated threshold voltage, and the variation that makes threshold voltage can follow signal is in time adjusted, thereby can effectively improve the precision of threshold voltage, and then can effectively reduce the error rate.
As shown in Figure 3, be threshold voltage adjustment unit second structural representation of the embodiment of the invention.On basis embodiment illustrated in fig. 1, the adjusting module 12 in the present embodiment specifically comprises computing module 121 and step-length module 122.Step-length module 122 is used for the adjustment step-length of storage threshold voltage; Adjustment direction, adjustment step-length and current threshold voltage that computing module 121 is used for according to threshold voltage calculate the adjusted threshold voltage of acquisition, if adjust direction for increasing, then current threshold voltage is increased and adjust step-length, if adjust direction for reducing, then current threshold voltage reduced to adjust step-length.Present embodiment will be adjusted the step-length separate, stored in step-length module 122, and computing module 121 obtains to adjust step-length from step-length module 122 and carries out the calculating of threshold voltage.Like this, when needs change the adjustment step-length, only need new adjustment step-length is stored in step-length module 122, and need not change computing module 121, thereby made things convenient for setting and the adjustment of adjusting step-length.
Threshold voltage is adjusted step-length and can be set in advance, and also in use the manual amendment is provided with.
As shown in Figure 4, threshold voltage adjusting device the 3rd structural representation for the embodiment of the invention, present embodiment is on basis embodiment illustrated in fig. 2, further added step-length module 14 has been set, be used to be provided with the adjustment step-length of threshold voltage, the adjustment step-length be set thereby make things convenient for equipment debugging personnel or administrative staff to revise according to actual conditions.
As shown in Figure 5, be threshold voltage adjusting device the 4th structural representation of the embodiment of the invention.Present embodiment is determined to adjust step-length according to the decision content that with the adjustment direction is parameter, thus the adjustment reaction time that can accelerate threshold voltage.In the present embodiment, adjusting module 12 comprises decision content module 123, step-length determination module 124 and computing module 121.Decision content module 123 is used for obtaining decision content according to adjusting direction.Step-length determination module 124 is used for determining according to decision content the adjustment step-length of threshold voltage, if decision content shows that the adjustment direction of threshold voltage is in the direction of monotonic increase or monotone decreasing, then increase and adjust step-length, adjust direction with bigger step-size change threshold voltage along this.Computing module 121 calculates the adjusted threshold voltage of acquisition according to adjustment direction, adjustment step-length and the current threshold voltage of threshold voltage.
When adopt adjusting direction as the parameter of decision content, can be two and adjust the direction assignment, set and increase to 1, be reduced to-1, calculate the accumulative total of adjusting direction and, and should accumulate and as decision content.When decision content satisfies certain trigger condition, for example, the decision content absolute value is during greater than a certain default decision content threshold value, can think that then the adjustment direction of threshold voltage is in the dull direction of adjusting, at this moment, increase threshold value and adjust voltage, change threshold voltage along this direction with bigger step-length, it is changed accelerate, thereby reduce to adjust the reaction time.When the absolute value of decision content during less than this default decision content threshold value, illustrate that the adjustment of threshold voltage is in the concussion state, can change threshold voltage with smaller step size this moment according to the adjustment direction, thereby can guarantee to adjust precision.Can in step-length determination module 124, preestablish a plurality of adjustment step-lengths, select suitable step-length according to decision content then; Also can calculate the adjustment step-length that should adopt according to decision content by step-length determination module 124.Can be controlled at the bigger adjustment step-length of employing in what situations by the numerical value that changes trigger condition, when adopt less adjustment step-length, thereby can control the adjustment reaction time of threshold voltage.
Present embodiment is determined the adjustment step-length of threshold voltage according to the decision content that can react the adjustment situation, thereby can when adjusting threshold voltage, high accuracy realize adjusting fast the reaction time, and,, can control the adjustment reaction time of threshold voltage by the trigger condition of decision content is set.
As shown in Figure 6, method for adjusting voltage threshold second flow chart for the embodiment of the invention comprises the steps:
Step B1, reception feedback quantity;
Step B2, determine the adjustment direction of threshold voltage according to the variation of feedback quantity;
Step B 3 exchanges perfect square to the acquisition decision content that adds up; Can set and increase to 1, be reduced to-1, and with the accumulative total of adjustment direction with as decision content;
Step B4, determine the adjustment step-length of threshold voltage according to decision content;
When decision content absolute value during greater than default decision content threshold value, can think that the adjustment direction of threshold voltage is in the dull direction of adjusting, from a plurality of step-lengths that set in advance, select or by calculating a bigger step-length; When the absolute value of decision content during, illustrate that the adjustment of threshold voltage is in the concussion state, selection or from a plurality of step-lengths that set in advance by calculating a less step-length less than default decision content threshold value;
Step B5, according to the adjustment direction of threshold voltage and adjust the current threshold voltage of step-size change, obtain adjusted threshold voltage;
Step B6, threshold voltage is carried out threshold voltage after digital-to-analogue conversion and the output conversion.
Present embodiment is determined the adjustment step-length of threshold voltage according to the decision content that can react the adjustment situation, be in the direction of dull adjustment when the adjustment direction of threshold voltage, change threshold voltage with bigger step-length along this direction, it is changed accelerate, thereby reduce to adjust the reaction time; When the adjustment of threshold voltage is in the concussion state, changes threshold voltage according to adjusting direction with smaller step size, thereby can guarantee to adjust precision; Like this, can when adjusting threshold voltage, high accuracy realize adjusting fast the reaction time; And,, can control the adjustment reaction time of threshold voltage by the trigger condition of decision content is set.
As shown in Figure 7, limiting amplifier one structural representation for the embodiment of the invention comprises threshold voltage adjustment unit 10 and amplitude limit amplifying unit 20.Threshold voltage adjustment unit 10 is adjusted threshold voltage according to feedback quantity; Amplitude limit amplifying unit 20 carries out amplitude limit according to threshold voltage to the signal of importing and amplifies.
In the present embodiment, threshold voltage adjustment unit 10 comprises: feedback comparison module 11 is used to receive feedback quantity, and determines the adjustment direction of threshold voltage according to the variation of feedback quantity; Adjusting module 12 is used for obtaining adjusted threshold voltage according to the adjustment direction and the adjustment step-length of threshold voltage; D/A converter module 13 is used for threshold voltage is carried out threshold voltage after digital-to-analogue conversion and the output conversion.
The limiting amplifier of present embodiment can be adjusted threshold voltage in real time according to feedback quantity, thereby can reduce the generation that the situation of the improper reduction error rate that causes is set because of threshold voltage.
Each threshold voltage adjustment unit of the embodiment of the invention all can be used for limiting amplifier shown in Figure 7.
As shown in Figure 8, be another structural representation of limiting amplifier of the embodiment of the invention.The limiting amplifier of present embodiment has adopted threshold voltage adjustment unit shown in Figure 5, can adjust threshold voltage with fast speeds and higher precision, thereby can more effectively reduce the error rate.
As shown in Figure 9, be the structural representation of the optical receiver of the embodiment of the invention, comprise photoelectric conversion unit 50, prime amplifying unit 60, amplitude limit amplifying unit 70, back level processing unit 80 and threshold adjustment unit 90.Photoelectric conversion unit 50 is converted to the signal of telecommunication with the light signal that receives, 60 pairs of signals of telecommunication that are converted to of prime amplifying unit amplify, amplitude limit amplifying unit 70 carries out the amplitude limit amplification according to threshold voltage to amplifying signal later, and exports the signal that generates to back level processing unit 80.Back 80 pairs of signals of level processing unit carry out Timing Processing again, and signal carried out processing such as shaping, analysis, calculating, the information of its output comprises: comprise the feedback quantity of information such as the error rate or error code number, and the signal of telecommunication that can analyze synchronously, handle, calculate by the subsequent processing device after the optical receiver.
In the present embodiment, threshold adjustment unit 90 comprises feedback comparison module 91, adjusting module 92 and D/A converter module 93.Feedback comparison module 91 receives feedback quantity, and determines the adjustment direction of threshold voltage according to the variation of feedback quantity.Adjusting module 92 obtains adjusted threshold voltage according to the adjustment direction and the adjustment step-length of threshold voltage; 93 pairs of threshold voltages of D/A converter module carry out the threshold voltage after digital-to-analogue conversion and the output conversion.Adjusting module 92 specifically comprises decision content module 921, step-length determination module 922 and computing module 923.Decision content module 921 obtains decision content according to adjusting direction, and exports step-length determination module 922 to.Step-length determination module 922 is determined the adjustment step-length of threshold voltage according to decision content and trigger condition, if decision content shows that the adjustment direction of threshold voltage is in the direction of monotonic increase or monotone decreasing, can adjust direction with bigger step-size change threshold voltage along this so, if decision content shows that the adjustment of threshold voltage is in the concussion state, can change threshold voltage with smaller step size according to adjusting direction so.Computing module 923 calculates the adjusted threshold voltage of acquisition according to adjustment direction, adjustment step-length and the current threshold voltage of threshold voltage.
The optical receiver of present embodiment can also realize adjusting fast the reaction time when can adjusting threshold voltage with higher precision, and, can control adjustment reaction time of threshold voltage by adjustment trigger conditions.
Each threshold voltage adjustment unit of the embodiment of the invention all can be used for optical receiver shown in Figure 9.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to finish by program, described program can be stored in the computer read/write memory medium, and described storage medium is as ROM/RAM, magnetic disc, CD etc.
The embodiment of the invention has realized that the variation that makes threshold voltage can follow signal is in time adjusted according to feedback quantity real-time regulated threshold voltage, thereby can effectively improve the precision of threshold voltage, and then can effectively reduce the error rate; Determine the adjustment step-length of threshold voltage according to the decision content that can react the adjustment situation, be in the direction of dull adjustment when the adjustment direction of threshold voltage, change threshold voltage with bigger step-length along this direction, it is changed accelerates, thereby reduce to adjust the reaction time, when the adjustment of threshold voltage is in the concussion state, changes threshold voltage according to adjusting direction with smaller step size, thereby can guarantee to adjust precision; Like this, can when adjusting threshold voltage, high accuracy realize adjusting fast the reaction time; And,, can control the adjustment reaction time of threshold voltage by the trigger condition of decision content is set.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the field should be appreciated that still and can make amendment or the part technical characterictic is equal to replacement the specific embodiment of the present invention; And not breaking away from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope that the present invention asks for protection.
Claims (14)
1. a threshold voltage adjustment unit is characterized in that, described threshold voltage adjustment unit comprises:
The feedback comparison module, be used to receive feedback quantity, and determine the adjustment direction of threshold voltage according to the variation of feedback quantity, described feedback quantity is the error rate of signal, the absolute number of error code, the error code number of level "0", the error code number of level"1", perhaps, the ratio of the error code number of the error code number of level "0" and level"1";
Adjusting module is used for obtaining adjusted threshold voltage according to the adjustment direction and the adjustment step-length of threshold voltage;
D/A converter module is used for adjusted threshold voltage is carried out threshold voltage after digital-to-analogue conversion and the output conversion.
2. threshold voltage adjustment unit according to claim 1 is characterized in that, described adjusting module comprises:
The step-length module is used for the adjustment step-length of storage threshold voltage;
Computing module, the adjustment direction, adjustment step-length and the current threshold voltage that are used for according to threshold voltage calculate the adjusted threshold voltage of acquisition.
3. according to claim 1 or 2 described threshold voltage adjustment units, it is characterized in that described threshold voltage adjustment unit also comprises: step-length is provided with module, be used to be provided with the adjustment step-length of threshold voltage.
4. threshold voltage adjustment unit according to claim 1 is characterized in that, described adjusting module comprises:
The decision content module is used for obtaining decision content according to adjusting direction, and described decision content shows that the adjustment direction of threshold voltage is in the dull direction of adjusting or is in the concussion state;
The step-length determination module is used for determining according to decision content the adjustment step-length of threshold voltage;
Computing module, the adjustment direction, adjustment step-length and the current threshold voltage that are used for according to threshold voltage calculate the adjusted threshold voltage of acquisition.
5. a method for adjusting voltage threshold is characterized in that, described method for adjusting voltage threshold comprises:
Receive feedback quantity, described feedback quantity is the error rate of signal, the absolute number of error code, and the error code number of level "0", the error code number of level"1", perhaps, the ratio of the error code number of level "0" and the error code number of level"1";
Determine the adjustment direction of threshold voltage according to the variation of feedback quantity;
Adjustment direction and adjustment step-length according to threshold voltage obtain adjusted threshold voltage;
Adjusted threshold voltage is carried out threshold voltage after digital-to-analogue conversion and the output conversion.
6. method for adjusting voltage threshold according to claim 5 is characterized in that, the described step that obtains adjusted threshold voltage according to the adjustment direction and the adjustment step-length of threshold voltage also comprises before:
Obtain decision content according to adjusting direction, described decision content shows that the adjustment direction of threshold voltage is in the dull direction of adjusting or is in the concussion state;
Determine the adjustment step-length of threshold voltage according to decision content.
7. method for adjusting voltage threshold according to claim 6 is characterized in that, describedly is specially according to adjusting the step that direction obtains decision content: exchange perfect square to assignment, calculate the accumulation of adjusting direction and, and should accumulate and as decision content.
8. method for adjusting voltage threshold according to claim 7 is characterized in that, describedly determines that according to decision content the step of the adjustment step-length of threshold voltage is specially: when decision content absolute value during greater than the decision content threshold value, increase threshold voltage and adjust step-length; When decision content absolute value during, reduce threshold voltage and adjust step-length less than the decision content threshold value.
9. a limiting amplifier comprises the amplitude limit amplifying unit, is used for according to threshold voltage the signal of importing being carried out amplitude limit and amplifies, and it is characterized in that described limiting amplifier also comprises the threshold voltage adjustment unit, and described threshold voltage adjustment unit comprises:
The feedback comparison module, be used to receive feedback quantity, and determine the adjustment direction of threshold voltage according to the variation of feedback quantity, described feedback quantity is the error rate of signal, the absolute number of error code, the error code number of level "0", the error code number of level"1", perhaps, the ratio of the error code number of the error code number of level "0" and level"1";
Adjusting module is used for obtaining adjusted threshold voltage according to the adjustment direction and the adjustment step-length of threshold voltage;
D/A converter module is used for adjusted threshold voltage is carried out threshold voltage after digital-to-analogue conversion and the output conversion.
10. limiting amplifier according to claim 9 is characterized in that, described adjusting module comprises:
The step-length module is used for the adjustment step-length of storage threshold voltage;
Computing module, the adjustment direction, adjustment step-length and the current threshold voltage that are used for according to threshold voltage calculate the adjusted threshold voltage of acquisition.
11. limiting amplifier according to claim 9 is characterized in that, described adjusting module comprises:
The decision content module is used for obtaining decision content according to adjusting direction, and described decision content shows that the adjustment direction of threshold voltage is in the dull direction of adjusting or is in the concussion state;
The step-length determination module is used for determining according to decision content the adjustment step-length of threshold voltage;
Computing module, the adjustment direction, adjustment step-length and the current threshold voltage that are used for according to threshold voltage calculate the adjusted threshold voltage of acquisition.
12. optical receiver, comprise: photoelectric conversion unit, the prime amplifying unit, amplitude limit amplifying unit and back level processing unit, the light signal that described photoelectric conversion unit is used for receiving is converted to the signal of telecommunication, described prime amplifying unit is used for the signal of telecommunication that is converted to is amplified, described amplitude limit amplifying unit is used for carrying out the amplitude limit amplification according to threshold voltage to amplifying signal later, described back level processing unit is used for the signal of described amplitude limit amplifying unit output is carried out Timing Processing again, and signal carried out shaping, analyze, computing, it is characterized in that, described optical receiver also comprises the threshold voltage adjustment unit, and described threshold voltage adjustment unit specifically comprises:
The feedback comparison module, be used for determining the adjustment direction of threshold voltage according to the feedback quantity of back level processing unit output, described feedback quantity is the error rate of signal, the absolute number of error code, the error code number of level "0", the error code number of level"1", perhaps, the ratio of the error code number of level "0" and the error code number of level"1";
Adjusting module is used for obtaining adjusted threshold voltage according to the adjustment direction and the adjustment step-length of threshold voltage;
D/A converter module is used for giving described amplitude limit amplifying unit to the threshold voltage that adjusted threshold voltage carries out after digital-to-analogue conversion and the output conversion.
13. optical receiver according to claim 12 is characterized in that, described adjusting module comprises:
The step-length module is used for the adjustment step-length of storage threshold voltage;
Computing module, the adjustment direction, adjustment step-length and the current threshold voltage that are used for according to threshold voltage calculate the adjusted threshold voltage of acquisition.
14. optical receiver according to claim 12 is characterized in that, described adjusting module comprises:
The decision content module is used for obtaining decision content according to adjusting direction, and described decision content shows that the adjustment direction of threshold voltage is in the dull direction of adjusting or is in the concussion state;
The step-length determination module is used for determining according to decision content the adjustment step-length of threshold voltage;
Computing module, the adjustment direction, adjustment step-length and the current threshold voltage that are used for according to threshold voltage calculate the adjusted threshold voltage of acquisition.
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| CN101783125A (en) * | 2010-03-04 | 2010-07-21 | 青岛海信电器股份有限公司 | Reference voltage adjusting device, method thereof and liquid crystal display |
| CN102236045A (en) * | 2010-04-30 | 2011-11-09 | 东莞华仪仪表科技有限公司 | Low-frequency analog square wave signal threshold voltage AD sampling method |
| CN102386969B (en) * | 2010-09-02 | 2016-02-10 | 中兴通讯股份有限公司 | A kind of optical communication system receptivity optimization method and device |
| CN102542963A (en) * | 2012-02-23 | 2012-07-04 | 青岛海信电器股份有限公司 | Method and system for automatically adjusting VCOM voltage of liquid crystal module product |
| CN103532636B (en) * | 2012-11-02 | 2017-02-01 | 黄山市光锐通信有限公司 | Optical module and receiving unit thereof |
| CN104202094A (en) * | 2014-08-28 | 2014-12-10 | 北京邮电大学 | Method and device for controlling mode light power |
| CN105007050B (en) * | 2015-07-31 | 2018-03-13 | 广州飞达音响股份有限公司 | A kind of adjustable audio signal automatic amplitude limiting apparatus of threshold value |
| CN112965046A (en) * | 2017-03-29 | 2021-06-15 | 深圳市大疆创新科技有限公司 | Laser radar and moving platform |
| CN211236238U (en) | 2017-03-29 | 2020-08-11 | 深圳市大疆创新科技有限公司 | Light detection and ranging (LIDAR) system and unmanned vehicle |
| CN107942878B (en) * | 2017-12-18 | 2019-12-31 | 青岛科海健堂生物有限公司 | Self-learning fault monitoring and alarming system of three-foot centrifuge |
| CN113517866B (en) * | 2021-07-07 | 2024-02-13 | 广州市迪士普音响科技有限公司 | Operational amplifier and feedback type amplitude limiting circuit thereof |
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| US6249556B1 (en) * | 1998-05-27 | 2001-06-19 | Intel Corporation | Dynamic thresholding for input receivers |
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