CN101471906B - Novel continuous time suitable equalization device architecture - Google Patents
Novel continuous time suitable equalization device architecture Download PDFInfo
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- CN101471906B CN101471906B CN2007103054588A CN200710305458A CN101471906B CN 101471906 B CN101471906 B CN 101471906B CN 2007103054588 A CN2007103054588 A CN 2007103054588A CN 200710305458 A CN200710305458 A CN 200710305458A CN 101471906 B CN101471906 B CN 101471906B
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Abstract
The invention relates to a continuous time adaptable equalizer for equalizing a first transmission signal on a transmission line. The equalizer comprises a filter used for receiving the first transmission signal, filtering the first transmission signal according to a feedback control signal and generating an output signal; a first selection switching device which is coupled with the filter and used for generating a first selection switching signal according to the output signal and adjusting the amplitude of the first selection switching signal according to an amplitude control signal; a control enhancement module which is coupled with the filter and the first selection switching device and used for generating the feedback control signal according to the output signal and the first selection switching signal; and a control circuit which is coupled with the selection switching device and used for receiving a second transmission signal on the transmission line and outputting the amplitude control signal according to the second transmission signal.
Description
Technical field
The present invention refers to a kind of continuous time suitable equalization device (continuous-time adaptive equalizer) especially about a kind of eqalizing cricuit (equalizer).
Background technology
As known in the art, when signal transmitted on transmission line, signal can be decayed accordingly along with the length of transmission line, therefore, when signal transferred to destination (signal receiver), the signal that signal receiver received may be lost genuine situation.
In order to solve the above problems, those skilled in the art can build in the front end of signal receiver usually and put an eqalizing cricuit, are reduced to signal originally with the signal after will decaying, and can correctly handle the signal that transmits to allow signal receiver thereafter.
For instance; in the signal transmission of the USB of computer system, PCI-E interface; or in the transmission of the signal of the HDMI interface of LCD; the HFS of signal is through regular meeting's decay to some extent in the process of transmission; therefore; aforesaid eqalizing cricuit is just often built the receiving terminal that places aforementioned several interfaces, provides a suitable gain with the HFS in signal, makes the signal after the decay be reduced to signal originally.So, computer system/LCD just can correctly be understood the data-signal that is transmitted, and carries out suitable processing.
In the paper that Srikanth Gandi, Jri Lee, Daishi Takeuchi and Brhzad Razavi deliver " ISSCC2005/SESSION18/HIGH-SPEED INTERCONNECTS ANDBUILDING BLOCKS/18.1 (A 10Gb/s CMOS Adaptive Equalizer for BackplaneApplicatoins) " among, disclosed a kind of continuous time suitable equalization device.See also the 1st figure at this, the 1st figure is the functional block diagram of known continuous time suitable equalization device 100.Shown in the 1st figure, continuous time suitable equalization device 100 includes active high pass filter (active high-pass filter) 110, device (slicer) 120 is cut in choosing, promote control module (boost control module) 130, amplitude control module (swing control module) 140, and buffer (buffer) 150.
Wherein, active high pass filter 110 is used for carrying out aforesaid high-frequency signal amplifieroperation, and in other words, active high pass filter 110 is with received data-signal D
InHigh-frequency signal part amplified the data-signal D after handling with output
OutAnd the data-signal D after handling
OutJust can export the signal receiver (not being shown among the figure) of next stage to through after the buffering of buffer 150.
Yet, because eqalizing cricuit 100 is receiving data-signal D
InThe time, and can't learn the situation of signal, for instance, eqalizing cricuit 100 also can't be learnt the attenuation degree of signal, therefore, eqalizing cricuit 100 need one be adjusted mechanism, with according to received data-signal D
In, character, dynamically adjust the frequency range of active high pass filter 110.
And choosing to cut device 120 is to be used as aforesaid adjustments mechanism with promoting control module 130, shown in the 1st figure, and choosing is cut device 120 and is promoted control module 130 and be feedback loop, to feedback the filtering frequency range of controlling active high pass filter 110.
Wherein, choosing is cut device 120 and is promoted control module 130 with A point signal (D
Out) be converted to the square wave pattern, and promote the signal difference that control module 140 just can be ordered according to A point and B, the reset signal is to active high pass filter 110, so that the filtering frequency range (frequency response) of active high pass filter 110 can be step by step near correct frequency range, and then makes data-signal D
OutCan be consistent with original data.
Yet, only have only an enhancement control loop still to be not enough to guarantee data-signal D
OutCorrectness; Note that because eqalizing cricuit 100 is receiving data-signal D at this
InThe time, also can't learn data-signal D
InAmplitude, yet, if choosing cut the square wave amplitude that device 120 exported can't corresponding A point signal D
OutAmplitude, can operate even promote control module 130 so, still may make eqalizing cricuit 100 integrated circuits be locked in wrong operating point (making active high pass filter 110 have wrong frequency response), and can't make data-signal D
OutBe reduced to original data.
Therefore, amplitude control module 140 is with solving aforesaid problem, and choosing is cut device 120 and is feedback loop with amplitude control module 140, cuts the square wave amplitude that device 120 is exported to feedback the control choosing.In other words, the signal amplitude difference that amplitude control module 140 is ordered according to A point and B is exported another feedback signal to choosing and is cut device 120 so that choosing cut the square wave amplitude that device 120 exported can be identical with the amplitude of A point signal.
Through aforesaid two feedback loop, eqalizing cricuit 100 just can roughly be guaranteed the data-signal D that it is exported
OutTherefore the data that meeting is corresponding original also make the transmission quality of signal promote.
Yet aforesaid eqalizing cricuit 100 has its shortcoming, shown in the 1st figure, because two feedback loop are positioned at same signal path, therefore, these two loops can't operate simultaneously, if these two loops are operated simultaneously, the stability of eqalizing cricuit 100 is reduced (for example may produce concussion); Therefore, in practical application, in order to promote the stability of eqalizing cricuit 100, the running speed (frequency range) of amplitude control module 140 (amplitude control loop) must be higher than promoting control module 130 (enhancement control loop), and in other words, eqalizing cricuit 100 must utilize amplitude control module 140 earlier, make A point signal identical with the pairing amplitude of B point signal, switch to again afterwards and promote control module 130, promote control module 130 and correctly feedback control, so can make data-signal D to utilize
OutOutput correctly.
In brief, circuit designers must be carried out stability analysis to aforesaid eqalizing cricuit 100, and carries out comparatively complicated design, and aforesaid eqalizing cricuit is normally operated; For instance, if design is not good, for example still to be not enough to A point signal identical with the pairing amplitude of B point signal the 140 running times of amplitude control module, so just, can make enhancement control module 130 can't correctly carry out to feedback operates, and then make active high pass filter 110 have wrong frequency response, and can't correctly restore data-signal originally.
In addition, except designing complexity, on circuit design,, promote the bigger electric capacity of the more necessary use of control module, so just increased the area and the power consumption of integrated circuit if will make the frequency range of promoting control module 130 be lower than amplitude control module 140.
Summary of the invention
Therefore, one of main purpose of the present invention is to provide a kind of continuous time suitable equalization device, and it utilizes two each and every one other single loops to reach enhancement control operation and amplitude control operation, to solve the problem that double-circuit system was caused in the prior art.
According to one embodiment of the invention, disclose a kind of continuous time suitable equalization device (continuous-time adaptive equalizer), this continuous time suitable equalization device includes: filter, receive this first transmission signal, be used for according to feedbacking control signal so that this first is transmitted signal and carry out filtering, and produce output signal; Device is cut in first choosing, is coupled to this filter, is used for cutting signal according to the signal level of this output signal to produce first choosing, and adjusts the amplitude that signal is cut in this first choosing according to amplitude control signal; The enhancement control module is coupled to this filter and device is cut in this first choosing, is used for cutting signal according to this output signal and this first choosing, produces this back coupling control signal; And control circuit, being coupled to this first choosing and cutting device, this control circuit is used for receiving second on this transmission line and transmits signal, and second transmits the amplitude of signal to export this amplitude control signal according to this.
Continuous time suitable equalization device of the present invention utilizes two each and every one other single loops to reach the purpose of promoting control operation and amplitude control operation respectively, therefore, the present invention can't have existing two circuit shortcoming, and then reduced the complexity of circuit design, and can reduce the area and the power consumption of integrated circuit.
Description of drawings
The 1st figure is the functional block diagram of existing continuous time suitable equalization device.
The 2nd figure is the functional block diagram of an embodiment of continuous time suitable equalization device of the present invention.
Embodiment
See also the 2nd figure at this, the 2nd figure is the functional block diagram of an embodiment of continuous time suitable equalization device 200.Shown in the 2nd figure, continuous time suitable equalization device 200 includes an active high pass filter (active high-pass filter) 210, device (slicer) 220,221 is cut in two choosings, one promotes control module (boost control module) 230, one amplitude control module (swing control module) 240, and two buffers (buffer) 250,251.
Wherein, promote control module 230 and have identical functions with amplitude control module 140, operation, and circuit configurations with amplitude control module 240 and aforesaid enhancement control module 130, this field has knows usually that the knowledgeable should understand and real work the in addition, so do not give unnecessary details in this in addition.
Before explanation know-why of the present invention, please notice earlier, in some signal transmission interfaces (such as HDMI, DVI, interfaces such as LVDS, RSDS), except the transmission of carrying out data-signal, also can transmit a frequency signal simultaneously, in addition, known as industry, aforesaid frequency signal can have identical amplitude with data-signal.
The present invention utilizes aforesaid character, reaches the purpose of amplitude control operation, that is the present invention uses aforesaid frequency signal to carry out amplitude back coupling control, so just can be equivalent to utilize data-signal to carry out amplitude back coupling control.
In addition, shown in the 2nd figure, eqalizing cricuit 200 has two signal paths, and wherein 1 signal path receives data-signal D
In, and being used as the usefulness of promoting control loop, another path is receiving frequency signals CK then
In, with usefulness as amplitude control loop.
In the same manner, wherein active high pass filter 210 is used for carrying out the high frequency amplifieroperation, and in other words, active high pass filter 210 is with received data-signal D
InHFS amplified, with the data-signal D of output after the gradeization
OutAnd the data-signal D after the gradeization
OutJust can export the signal receiver (not being shown among the figure) of next stage to through after the buffering of buffer 250.
And device 220 is cut in choosing and promote control module 230 is an enhancement control feedback loop, to feedback the filtering frequency range of controlling active high pass filter 210.Wherein, choosing is cut device 220 and is promoted control module 230 with A point signal (D
Out) be converted to the square wave pattern, and promote the signal difference that control module 240 just can be ordered according to A point and B, export a feedback signal to active high pass filter 210, so that the filtering frequency range (frequency response) of active high pass filter 210 can be step by step near correct frequency range, and then make data-signal D
OutCan be consistent with original data.
In addition, in the same manner, can correctly operate in order to ensure promoting control module 230, eqalizing cricuit 200 integrated circuits are locked in correct operating point (making active high pass filter 210 have correct frequency response), eqalizing cricuit 200 needs one in addition and adjusts mechanism so that choosing cut the square wave amplitude that device 220 can be exported can be identical with the amplitude of A point signal.
Note that in present embodiment frequency signal CK at this
InExcept the buffering that merely sees through buffer 251 is output as frequency signal CK
OutOutside; Choosing is cut device 221 and is utilized frequency signal CK in addition with amplitude control module 240
In, carry out aforesaid adjustment mechanism so that choosing cut the square wave amplitude that device 220 can be exported can be identical with the amplitude of A point signal.Wherein, choosing is cut device 221 with frequency signal CK
InBe converted to square wave.
As previously mentioned, because frequency signal CK
InWith data-signal D
InCorresponding haply identical amplitude, therefore, if choosing is cut device 221 and cut device 220 and have identical structure with choosing, so, the detecting choosing is cut device 221 inputs and just can be equivalent to the detecting choosing with output amplitude difference each other and cut device 220 input and output amplitude differences each other.
Therefore, in present embodiment, square wave and the frequency signal CK that device 221 is exported cut in the 240 detecting choosings of amplitude control module
InBetween signal amplitude (or equivalence position accurate) difference, export an amplitude control signal to choosing and cut device 221 so that choosing cut square wave amplitude that device 221 exported can with frequency signal CK
InAmplitude identical; In addition, this amplitude control signal also inputs to choosing simultaneously and cuts device 220, therefore, is elected to and cuts square-wave signal amplitude and the frequency signal CK that device 221 is exported
InAmplitude when identical, in theory, square-wave signal amplitude that device 220 exported is cut in choosing also can be simultaneously and data-signal D
OutAmplitude identical.In addition, according to one embodiment of the invention, the amplitude control signal of being exported by amplitude control module 240, the current source in the device 220,221 is cut in the may command choosing, change its current value, or controlling resistance, change its resistance value, it is identical with the amplitude of its input signal to make choosing cut the square-wave signal amplitude that device 220,221 exported.
In addition, because frequency signal CK
InGenerally can have more complete waveform than data-signal, therefore, detecting selects the input/output signal of cutting device 221 also can select the input/output signal of cutting device 220 better than detecting in theory.
By aforesaid exposure as can be known, by aforesaid amplitude control loop, just can make choosing cut square-wave signal amplitude that device 220 exported also can be simultaneously and data-signal D
OutAmplitude identical, therefore promote control loop and also can correctly operate, so that data-signal D
OutCan be consistent with original data.
Please note at this, because the purpose that the present invention utilizes two single loops (that is two loops are positioned at different signal paths) to reach promotes control and amplitude control, the benefit of aforesaid mechanism is: because two independent loops are not positioned at same signal path, therefore the present invention's two independent loops can operate simultaneously, and do not have the problem of concussion; On behalf of continuous time suitable equalization device 200 of the present invention, this have advantages of higher stability, and in design, circuit designers also need not be carried out complicated stability analysis, also can avoid using excessive capacity cell in circuit, and then save circuit area.
In addition, because two loops can operate simultaneously, this has represented promoting control module 230 and has feedback in the control, and amplitude control module 240 is also constantly in the adjustment of carrying out the signal amplitude that A point and B order; Therefore, compared to existing eqalizing cricuit framework, the present invention need not worry amplitude control module 240 deficiencies so that the A point equates with B point signal amplitude, because amplitude control module 240 is carried out the signal amplitude adjustment that A point and B are ordered constantly, amplitude control module 240 does not have problem successively with enhancement control module 230 in running, therefore, and after running a period of time, amplitude control module 240 just can make the A point equate with the signal amplitude that B is ordered, and has so just guaranteed data-signal D
OutCan correctly revert back original data.
Though note that among the exposure of front at this, continuous time suitable equalization device 200 of the present invention utilizes frequency signal to carry out the back coupling control of amplitude, and preferably uses among the interfaces such as HDMI, DVI, LVDS, RSDS; Yet such practice only is one embodiment of the invention, but not restriction of the present invention.In practical application, only must reference signal and the corresponding identical amplitude of data-signal, this reference signal just can be used among the amplitude back coupling mechanism so.
For instance, in USB interface or the transmission of the signal of PCI-E interface, do not have the transmission of frequency signal, but but can transmit several data-signals simultaneously, therefore, the present invention just can utilize the another one data-signal, is used as the reference signal of amplitude back coupling control; In other words, corresponding to aforesaid the 2nd figure, only must be with frequency signal CK
InReplacement so also can be reached identical purpose for another data-signal.
Even the present invention also can utilize same data-signal, is used as the usefulness of reference signal, in other words, corresponding to aforesaid the 2nd figure, only must be with data-signal D
In(or data-signal D
Out) input to select and cut device 221, with replacement frequency signal CK
In, so also can reach identical purpose.
Though note that among the exposure of front, be to utilize choosing to cut device 250,251, so that aforesaid data-signal (frequency signal) is converted to square wave at this; Yet such practice also only is one embodiment of the invention, but not restriction of the present invention.In actual applications, all can be the circuit of square wave with conversion of signals, all can be used to the replacement choosing and cut device 250,251, for instance, in the eqalizing cricuit 200, can utilize sample-and-hold circuit (sample and hold circuit), 1 analog/digital change-over circuit (1-bit ADC), comparator (comparator), data recovery circuit circuit such as (data recovery circuit), replace choosing and cut device to carry out identical functions, and aforesaid various corresponding variation also belongs to category of the present invention.
In addition, have for this field and know usually that the knowledgeable should understand and make aforesaid active high pass filter 210 in fact; For instance, angle in frequency response, active high pass filter 210 has adjustable limit (pole) and zero point (zero), that is, active high pass filter 210 itself can be according to the feedback signal that receives, adjust the limit (pole) of self and the position at zero point (zero), with so that adjust the frequency response (being equivalent to filtering frequency range and the gain of adjusting active high pass filter 210) of active high pass filter 210; With an embodiment, active high pass filter 210 inside can have adjustable capacity cell or resistive element, and it can adjust its capacitance that has and resistance value according to feedback signal, so just can reach aforesaid mechanism.
Compared to prior art, continuous time suitable equalization device of the present invention utilizes two each and every one other single loops to reach the purpose of promoting control operation and amplitude control operation respectively, therefore, the present invention can't have existing two circuit shortcoming, and then reduced the complexity of circuit design, and can reduce the area and the power consumption of integrated circuit simultaneously.
Though more than with embodiment the present invention is described, therefore do not limit scope of the present invention, only otherwise break away from main idea of the present invention, the sector person can carry out various distortion or change.
Claims (20)
1. eqalizing cricuit is used for first on the transmission line such as gradeization to transmit signal, and this eqalizing cricuit comprises:
Filter receives this and first transmits signal, is used for feedbacking control signal so that this first is transmitted signal and carry out filtering according to one, and produces output signal;
Device is cut in first choosing, is coupled to this filter, is used for cutting signal according to the signal level of this output signal to produce first choosing, and adjusts the amplitude that signal is cut in this first choosing according to amplitude control signal;
The enhancement control module is coupled to this filter and device is cut in this first choosing, is used for cutting signal according to this output signal and this first choosing, produces this back coupling control signal; And
Control circuit is coupled to this first choosing and cuts device, and this control circuit is used for receiving second on this transmission line and transmits signal, and second transmits the amplitude of signal to export this amplitude control signal according to this.
2. eqalizing cricuit as claimed in claim 1, wherein this control circuit comprises:
Device is cut in second choosing, receives this and second transmits signal, is used for producing second choosing and cutting signal according to this second signal level that transmits signal; And
The amplitude control module is coupled to this second choosing and cuts device, is used for second transmitting the accurate difference in position that signal is cut in signal and this second choosing according to this, produces this amplitude control signal.
3. eqalizing cricuit as claimed in claim 1, wherein this first transmission signal has identical amplitude in fact with this second transmission signal.
4. eqalizing cricuit as claimed in claim 1, wherein to cut signal be square-wave signal in this first choosing.
5. eqalizing cricuit as claimed in claim 1, wherein this second transmission signal is this first transmission signal.
6. eqalizing cricuit as claimed in claim 1, wherein this second transmission signal is the frequency signal on this transmission line.
7. eqalizing cricuit as claimed in claim 1, wherein this back coupling control signal is controlled the capacitance in this filter, to adjust the frequency response of this filter.
8. eqalizing cricuit as claimed in claim 1, wherein this amplitude control signal is controlled the magnitude of current that the current source in the device is cut in this choosing, cuts the signal amplitude of signal to adjust this first choosing.
9. eqalizing cricuit as claimed in claim 1, wherein this amplitude control signal is controlled this choosing and is cut resistance value in the device, cuts the signal amplitude of signal to adjust this first choosing.
10. eqalizing cricuit as claimed in claim 1, wherein this filter is active high pass filter.
11. eqalizing cricuit as claimed in claim 1, it is applied in the transmission interface of USB, PCI-E HDMI, DVI, LVDS or RSDS.
12. a signal equalization method is used for first on the transmission line such as gradeization to transmit signal, these change methods comprise:
Receive this first transmission signal;
According to feedbacking control signal, this first transmission signal is carried out filtering, and produce output signal;
According to the signal level of this output signal, produce first choosing and cut signal, and adjust the amplitude that signal is cut in this first choosing according to amplitude control signal;
Cut signal according to this output signal and this first choosing, produce this back coupling control signal; And
Receive second on this transmission line and transmit signal, and according to this second amplitude that transmits signal, to export this amplitude control signal.
13. equalization method as claimed in claim 12 wherein according to the signal amplitude of this second transmission signal, more comprises with the step of exporting this amplitude control signal:
According to this second transmission signal, produce second choosing and cut signal; And
Second transmit the amplitude that signal is cut in signal and this second choosing according to this, produce this amplitude control signal.
14. equalization method as claimed in claim 12, wherein this first transmission signal has identical amplitude in fact with this second transmission signal.
15. equalization method as claimed in claim 12, wherein this second transmission signal is this first transmission signal.
16. equalization method as claimed in claim 12, wherein this second transmission signal is the frequency signal on this transmission line.
17. equalization method as claimed in claim 12 more comprises:
Adjust capacitance according to this back coupling control signal.
18. equalization method as claimed in claim 12 more comprises:
According to the magnitude of current of this amplitude control signal adjustment current source, cut the amplitude of signal to adjust this first choosing.
19. equalization method as claimed in claim 12 more comprises:
Adjust resistance value according to this amplitude control signal, cut the amplitude of signal to adjust this first choosing.
20. equalization method as claimed in claim 12 is applied in the transmission interface of USB, PCI-E HDMI, DVI, LVDS or RSDS.
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|---|---|---|---|
| CN2007103054588A CN101471906B (en) | 2007-12-28 | 2007-12-28 | Novel continuous time suitable equalization device architecture |
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|---|---|---|---|
| CN2007103054588A CN101471906B (en) | 2007-12-28 | 2007-12-28 | Novel continuous time suitable equalization device architecture |
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| US8670248B2 (en) * | 2010-12-29 | 2014-03-11 | System General Corporation | Primary-side controlled power converter with an RC network and method thereof |
| CN106143359B (en) * | 2015-04-15 | 2019-01-04 | 瑞昱半导体股份有限公司 | Signal transmission method and the communication system for using its method |
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|---|---|---|---|---|
| US5880645A (en) * | 1997-07-03 | 1999-03-09 | Level One Communications, Inc. | Analog adaptive equalizer with gain and filter correction |
| CN1463524A (en) * | 2001-05-29 | 2003-12-24 | 皇家菲利浦电子有限公司 | Circuit and method for reducing performence loss related to feedback loop delay in decision feedback equaliser |
| CN1490970A (en) * | 2003-09-19 | 2004-04-21 | 烽火通信科技股份有限公司 | Dynamic gain balancing method and optical transmission system therewith |
| CN1691655A (en) * | 2003-12-19 | 2005-11-02 | 美国博通公司 | Decision feedback equalizer and clock and data recovery circuit for high-speed applications |
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2007
- 2007-12-28 CN CN2007103054588A patent/CN101471906B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5880645A (en) * | 1997-07-03 | 1999-03-09 | Level One Communications, Inc. | Analog adaptive equalizer with gain and filter correction |
| CN1463524A (en) * | 2001-05-29 | 2003-12-24 | 皇家菲利浦电子有限公司 | Circuit and method for reducing performence loss related to feedback loop delay in decision feedback equaliser |
| CN1490970A (en) * | 2003-09-19 | 2004-04-21 | 烽火通信科技股份有限公司 | Dynamic gain balancing method and optical transmission system therewith |
| CN1691655A (en) * | 2003-12-19 | 2005-11-02 | 美国博通公司 | Decision feedback equalizer and clock and data recovery circuit for high-speed applications |
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