CN101459632A - Adaptive equalizing circuit and method - Google Patents
Adaptive equalizing circuit and method Download PDFInfo
- Publication number
- CN101459632A CN101459632A CNA2007101793462A CN200710179346A CN101459632A CN 101459632 A CN101459632 A CN 101459632A CN A2007101793462 A CNA2007101793462 A CN A2007101793462A CN 200710179346 A CN200710179346 A CN 200710179346A CN 101459632 A CN101459632 A CN 101459632A
- Authority
- CN
- China
- Prior art keywords
- low
- frequency
- gain
- regulation loop
- frequency component
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The invention provides a self-adaptive equalizing circuit and a method thereof. The self-adaptive circuit of the invention comprises a low-pass filter unit with adjustable gain, a high-pass filter unit with adjustable gain, a low-frequency gain regulating loop and a high-frequency gain regulating loop, wherein the low-frequency gain regulating loop does not depend on the high-frequency gain regulating loop, the high-frequency gain regulating loop depends on the low-frequency gain regulating loop, or the high-frequency gain regulating loop does not depend on the low-frequency gain regulating loop, the low-frequency gain regulating loop depends on the high-frequency gain regulating loop, or the low-frequency gain regulating loop and the high-frequency gain regulating loop work in a mutual coordination mode. The method and circuit of a new self-adaptive equalizer, which are provided by the invention, have better and more stable work and have higher self-adaptive regulation precision.
Description
Technical field
The present invention relates to a kind of equalizer, specifically, relate to a kind of Adpative equalizing circuit and method.
Background technology
When carrying out the high-speed serial data transmission by cable or PCB cabling, because the channel characteristics that data transmit is similar to low pass filter, so when signal passed through Channel Transmission, the different frequency composition of signal just had energy attenuation and phase distortion in various degree.Like this, the signal that the reception termination receives will be destroyed, well-known intersymbol interference that Here it is (ISI).Equalizer is used to eliminate or reduce the influence of intersymbol interference (ISI).Thereby guaranteed reliability of data transmission.
The frequency-response characteristic of adaptive equalizer is opposite to the frequency-response characteristic of signal with cable, the energy attenuation of the frequency dependence that it can the compensated high-speed serial signal produces when other Channel Transmission such as cable.After channel adds adaptive equalizer, to the total response of frequency we be the same in the interested bandwidth.So adaptive equalizer can recover the data that receive again.Adaptive equalizer can be divided into adaptive equalizer and discrete time adaptive equalizer continuous time.When operating frequency was high frequency (more than the Gbps), continuous time, adaptive equalizer had bigger advantage than the discrete time adaptive equalizer.
Up to the present, achievement in research about the adaptive equalizer (hereinafter to be referred as adaptive equalizer) of continuous time has been arranged a lot.J.N.Babanezhad is at ＂ A 3.3-V AnalogAdaptive Line-Equalizer for Fast Ethernet Data Connection, ＂ IEEE CICC, pp.343-346, in 1998, G.P.Hartman etc. are at ＂ Continuous-TimeAdaptive-Analog Coaxial Cable Equalizer in 0.5.mu.m CMOS, ＂ IEEEISCAS, pp.97-100, in 1999, a kind of traditional adaptive equalizer has been described, the method for its realization such as Fig. 1.In Fig. 1, at first by an equalization filter 101, this equalization filter has two signalling channels to the signal that receives: unit gain path 10 2 and high-frequency gain improve path 10 3.Path 10 2 and 103 output are by the output of adder 104 additions as equalization filter 101.The output of equalization filter 101 is as the input of adjusting comparator 107.The maximum amplitude of oscillation of adjusting comparator 107 is limited in the predetermined value.Improve the gain of path 10 3 for the high-frequency gain of determining equalization filter 101, a high-frequency gain regulation loop is used to regulate the high-frequency gain of path 10 3, this high-frequency gain regulation loop is described below: a branch road of equalization filter 101 outputs is by high pass filter 105, and the output of high pass filter 105 is as the input of rectifier 106.The output of adjusting comparator 107 is by high pass filter 108, and the output of high pass filter 108 is as the input of rectifier 109, and rectifier 106 and 109 output are as the input of error amplifier 110.Like this, the input and output signal of adjusting comparator 107 is through high-pass filtering and rectification, and the energy of its HFS is extracted respectively.Afterwards, adjust the difference of the input and output signal HFS energy of comparator 107 and amplify output through error amplifier 110,110 output is through the integration of capacitor C, voltage on the capacitor C is as the gain-adjusted signal of high-frequency gain raising path 10 3, and this conditioning signal has been determined the gain that high-frequency gain improves path 10 3.When the slope of the input and output signal of adjusting comparator 107 equated, the voltage on the integrating capacitor C maintained on the stable numerical value, and high-frequency gain improves the gain of path 10 3 and determines that whole high-frequency gain regulation loop is operated in stable state.
High-frequency gain among Fig. 1 improves the high frequency attenuation that path 10 3 has compensated channel.So in the ideal case, the loss of the signal that finally obtains on its entire spectrum all equates.But this conclusion is that the gain that is based upon unit gain path 10 2 is on 1 the basis.In the circuit of reality, it is to trade off between 1 that unit gain path 10 2 often will and keep at bandwidth of operation gaining.So unit gain passage 1 tends to depart from the ideal value 1 of hypothesis, thereby the self adaptation degree of regulation of high-frequency gain is reduced.
In order to address this problem, Choi, Jong-Sang (Seoul, KR) in United States Patent (USP) 6819166 " Continuous-time; low-frequency-gain/high-frequency-boostingjoint adaptation equalizer and method ", a kind of newer adaptive regulation method has been proposed, its method such as Fig. 2.New method has increased the low-frequency gain regulation loop on traditional adaptive equalizer basis.The operation principle of low-frequency gain regulation loop and high-frequency gain regulation loop are similar.
As Fig. 2, the high-frequency gain regulation loop of adaptive equalizer by the high pass filter 203 of Gain Adjustable, adjust comparator 209, high pass filter 207 and 212, rectifier 208 and 213, error amplifier 215 and form, the operation principle of loop is identical with high-frequency gain regulation loop among Fig. 1; The low-frequency gain regulation loop of adaptive equalizer is made up of Gain Adjustable low pass filter 202, adjustment comparator 209, low pass filter 205 and 210, rectifier 206 and 211, error amplifier 214.The input and output signal of adjusting comparator 209 is through low pass pass filter and rectification, and the energy of its low frequency part is extracted respectively.Afterwards, adjust the difference of the input and output signal low frequency part energy of comparator 209 and amplify output through error amplifier 214,214 output is through the integration of capacitor C 1, voltage on the capacitor C 1 is as the gain-adjusted signal of the adjustable passage 202 of low-frequency gain, and this conditioning signal has been determined the gain of the adjustable passage 202 of low-frequency gain.When the low frequency energy of the input and output signal of adjusting comparator 209 equated, the voltage on the integrating capacitor C1 maintained on the stable numerical value, and the gain of low-frequency gain is adjustable passage 202 determines that whole low-frequency gain regulation loop is operated in stable state.
Fig. 2 realizes that the method for adaptive equalizer also has the shortcoming of himself: high-frequency gain regulation loop and low-frequency gain regulation loop are separate.This shortcoming can cause increasing by the shake of adaptive equalizer data.Jri Lee is at " A20-Gb/s Adaptive Equalizer in0.13-μ m CMOS Technolog ", IEEE JOURNAL OFSOLID-STATECIRCUITS, VOL.41, NO.9, pp.2058-2066, among the SEPTEMBER 2006, another kind of newer adaptive regulation method has been described, its method such as Fig. 3.As Fig. 3, input signal is regulated by the radio-frequency component of 301,301 pairs of these signals of equalization filter and the gain of low-frequency component.301 output is divided into three the tunnel, leads up to output buffering 307 backs as the outputs of adaptive equalizer, and two-way is respectively as the input of low pass filter 305 and high pass filter 306 in addition.Through behind the rectifier 308, the average energy of the high and low frequency of signal part is extracted out.The difference of the average energy of the high and low frequency part of signal is changeed current circuit 309 by voltage can be to capacitor C charging or discharge.Like this, by the voltage of control capacitance C, can regulate the gain of low pass filter 302 gains and high pass filter 303.
Among Fig. 3, the operation principle of the low-and high-frequency gain-adjusted loop of adaptive equalizer is as follows: for the certain random signal of data transfer rate, the distribution proportion of its spectrum energy is certain.So we can determine a frequency f m (cut-off frequency for high pass filter 306 and low pass filter 305 among Fig. 3 equates with fm) according to the message transmission rate of signal, with fm during as the separation of low frequency part and HFS, the energy of signal low frequency and HFS frequency spectrum equates.So when the low frequency of 301 output signals of equalization filter among Fig. 3 equated with HFS, the magnitude of voltage on the capacitor C determined that thereupon circuit working is in stable state.
But the low-and high-frequency gain-adjusted is finished by same control signal, and this causes the energy of signal low frequency and HFS frequency spectrum to be difficult to reach accurate equal.In addition, because the low-and high-frequency gain-adjusted is finished by same control signal, if the message transmission rate of the signal that adaptive equalizer receives is variable, then boundary frequency fm also can change.But the cut-off frequency of high pass filter 306 and low pass filter 305 can't change along with the variation of message transmission rate.So when the message transmission rate of signal changes, the self adaptation degree of regulation variation of the adaptive equalizer of Fig. 3, even the circuit meeting cannot steady operation.
Summary of the invention
The purpose of this invention is to provide a kind of can be better, steady operation and have the Adpative equalizing circuit of higher self adaptation degree of regulation more.Another object of the present invention provides a kind of adaptive equilibrium method
In order to realize the object of the invention, technical scheme of the present invention is:
A kind of Adpative equalizing circuit comprises: the low-pass filter unit of Gain Adjustable, and regulate it by the low-frequency gain regulation loop and gain and come the low-frequency component of control input signals;
The high pass filter unit of Gain Adjustable is regulated it by the high-frequency gain regulation loop and is gained and come the radio-frequency component of control input signals;
The first low-frequency gain regulation loop, the low-frequency component by equalizing signal extracts the gain that comparison circuit comes the adjustable low-pass filter unit of ride gain;
The first high-frequency gain regulation loop by the high and low frequency composition extraction circuit and the comparison circuit of equalizing signal, is come the gain of the adjustable high pass filter unit of ride gain;
Has a signal mixed circuit unit at least with the signal output that permeates of the high pass filter unit output signal of the low-pass filter unit of Gain Adjustable and Gain Adjustable.
Described Adpative equalizing circuit also comprises: the second low-frequency gain regulation loop, by the high and low frequency composition extraction circuit and the comparison circuit of equalizing signal, the gain that comes the adjustable low-pass filter unit of ride gain;
A selection control circuit, this circuit are controlled the switching between the first low-frequency gain regulation loop and the second low-frequency gain regulation loop;
Described second low-frequency gain regulation loop and the mutual co-ordination of the first high-frequency gain regulation loop.
The low-frequency component of described equalizing signal extracts comparison circuit, extracts low-frequency component by the low frequency extraction circuit respectively and compares at the input/output terminal of adjusting comparator.
A kind of Adpative equalizing circuit comprises:
The low-pass filter unit of Gain Adjustable is regulated it by the low-frequency gain regulation loop and is gained and come the low-frequency component of control input signals;
The high pass filter unit of Gain Adjustable is regulated it by the high-frequency gain regulation loop and is gained and come the radio-frequency component of control input signals;
The first low-frequency gain regulation loop is by the high and low frequency composition extraction circuit and the comparison circuit of equalizing signal, the gain that comes the adjustable low-pass filter unit of ride gain;
The first high-frequency gain regulation loop, the radio-frequency component by equalizing signal extracts the gain that the comparison circuit circuit comes the adjustable high pass filter unit of ride gain;
Has a signal mixed circuit unit at least with the signal output that permeates of the high pass filter unit output signal of the low-pass filter unit of Gain Adjustable and Gain Adjustable.
Described Adpative equalizing circuit also comprises:
The second high-frequency gain regulation loop by the high and low frequency composition extraction circuit and the comparison circuit of equalizing signal, is come the gain of the adjustable high pass filter unit of ride gain;
A selection control circuit, this circuit are controlled the switching between the first high-frequency gain regulation loop and the second high-frequency gain regulation loop;
Described second high-frequency gain regulation loop and the mutual co-ordination of the first low-frequency gain regulation loop.
The radio-frequency component of described equalizing signal extracts the circuit of comparison circuit for extracting radio-frequency component respectively and compare by comparator at the input/output terminal of adjusting comparator.
The high and low frequency composition extraction circuit of described equalizing signal and comparison circuit be for to extract the radio-frequency component of equalizing signal and the frequency content in the low-frequency component by radio-frequency component extraction circuit or low-frequency component extraction circuit, and by the comparator circuit of the energy of the radio-frequency component of equalizing signal and low-frequency component relatively.
The radio-frequency component extraction circuit of described equalizing signal is the series connection successively of high pass filter and rectifier; The low-frequency component extraction circuit of described equalizing signal is the series connection successively of low pass filter and rectifier.
The adaptive equilibrium method that a kind of Adpative equalizing circuit is realized may further comprise the steps:
S1: possess two gain-adjusted loops at least, wherein pass through the gain of the adjustable low-pass filter unit of the first low-frequency gain regulation loop ride gain, come the gain size of control input signals low-frequency component, by the gain of the adjustable high pass filter unit of the first high-frequency gain regulation loop ride gain, the gain size of coming the control input signals radio-frequency component;
S2: the first low-frequency gain regulation loop reaches stable operating state by the circuit of self, the final operating state of the first high-frequency gain regulation loop depends on the operating state of the first low-frequency gain regulation loop circuit, after the first low-frequency gain regulation loop steady operation, the first high-frequency gain regulation loop just can reach stable operating state, and at this moment the first low-frequency gain loop and the first high-frequency gain loop all reach steady-working state;
S3: then by the signal after the signal mixed circuit unit output equilibrium of low-pass filter unit and high pass filter unit.
After step S2, also comprise step S21: at the first low-frequency gain regulation loop and the first high-frequency gain regulation loop steady operation after a period of time, select control circuit to switch to the second low-frequency gain regulation loop, the first low-frequency gain regulation loop quits work, by comparing the difference of low-frequency component and radio-frequency component, the second low-frequency gain regulation loop and the first high-frequency gain regulation loop begin mutual co-ordination, when the ratio of the energy of low-frequency component and radio-frequency component reached a fixing preset value, the second low-frequency gain regulation loop and the first high-frequency gain regulation loop could all be in stable operating state.
Described step S2 comprises further: the first low-frequency gain regulation loop is independently worked, and the gain of the low-frequency component of the input signal that receives is regulated, and finally obtained stable low-frequency gain; After first low-frequency gain is stable, size according to the stable low-frequency component energy of equalizing signal, the difference of the low-frequency component by equalizing signal relatively and the energy of radio-frequency component, the first high-frequency gain regulation loop is adjusted to certain stable value with the high-frequency gain of input signal.At this moment, the ratio of the energy of the low-frequency component of equalizing signal and radio-frequency component is a fixing preset value.
The adaptive equilibrium method that a kind of Adpative equalizing circuit is realized may further comprise the steps:
S1: possess two gain-adjusted loops at least, wherein pass through the gain of the adjustable low-pass filter unit of the first low-frequency gain regulation loop ride gain, come the gain size of control input signals low-frequency component, by the gain of the adjustable high pass filter unit of the first high-frequency gain regulation loop ride gain, the gain size of coming the control input signals radio-frequency component;
S2: the first high-frequency gain regulation loop reaches stable operating state by the circuit of self, the final operating state of the first low-frequency gain regulation loop depends on the operating state of the first high-frequency gain regulation loop, after the first high-frequency gain regulation loop steady operation, the first low-frequency gain regulation loop just can reach stable operating state, and at this moment the first low-frequency gain loop and the first high-frequency gain loop all reach steady-working state;
S3: then by the signal after the signal mixed circuit unit output equilibrium of low-pass filter unit and high pass filter unit.
After step S2, also comprise step S21: at the first low-frequency gain regulation loop and the first high-frequency gain regulation loop steady operation after a period of time, by selecting control circuit to switch to the second high-frequency gain regulation loop, the first high-frequency gain regulation loop quits work, the second high-frequency gain regulation loop begins to begin mutual co-ordination with the first low-frequency gain regulation loop by the difference that compares low-frequency component and radio-frequency component, when the difference of the energy of low-frequency component and radio-frequency component reached a fixing preset value, the second low-frequency gain regulation loop and the first high-frequency gain regulation loop could all be in stable operating state.
Described step S2 comprises further: the first high-frequency gain regulation loop is independently worked, and the gain of the radio-frequency component of the input signal that reception is obtained is regulated, and finally obtains stable high-frequency gain; After first high-frequency gain is stable, size according to the stable radio-frequency component energy of equalizing signal, the difference of the low-frequency component by equalizing signal relatively and the energy of radio-frequency component, the first low-frequency gain regulation loop is adjusted to certain stable value with the low-frequency gain of input signal.At this moment, the ratio of the energy of the low-frequency component of equalizing signal and radio-frequency component is a fixing preset value.
The method of the difference of the low-frequency component of described relatively equalizing signal and the energy of radio-frequency component comprises: the low-frequency component and the radio-frequency component of equalizing signal are extracted, and then the low-frequency component of equalizing signal and the energy of radio-frequency component are compared; Or the low-frequency component of equalizing signal extracted, and then the low-frequency component of equalizing signal and the gross energy of equalizing signal are compared; Or the radio-frequency component of equalizing signal extracted, and then the radio-frequency component of equalizing signal and the gross energy of equalizing signal are compared.
Beneficial effect:
The Method and circuits of the new adaptive equalizer that the present invention proposes, owing to do not work alone fully in low-frequency gain regulation loop and high-frequency gain regulation loop, even therefore the boundary frequency fm of low frequency part and HFS changes with the message transmission rate of signal, and the cut-off frequency of low-pass filter unit and high pass filter unit is constant, low-frequency gain regulation loop or high-frequency gain regulation loop can be carried out along with another loop in them Signal Regulation, thereby the present invention can be better, more stably work, and have higher self adaptation degree of regulation.
Description of drawings
Fig. 1 is the sketch of traditional a kind of embodiment of adaptive equalizer;
Fig. 2 is the sketch of traditional second kind of embodiment of adaptive equalizer;
Fig. 3 is the sketch of traditional the third embodiment of adaptive equalizer;
Fig. 4 is the sketch of first kind of embodiment of adaptive equalizer of the present invention;
Fig. 5 is the sketch of second kind of embodiment of adaptive equalizer of the present invention;
Fig. 6 is the sketch of the third embodiment of adaptive equalizer of the present invention;
Fig. 7 is the sketch of the 4th kind of embodiment of adaptive equalizer of the present invention;
Fig. 8 more closes to the sketch of actual circuit structure for Fig. 4 embodiment;
Fig. 9 is equalization filter 401 circuit embodiment figure preferably among Fig. 8;
Figure 10 is equalization filter unit 801,802,803 and 804 circuit embodiment figure preferably among Fig. 9;
Figure 11 is NMOS offset generating circuit 805 circuit embodiment figure preferably among Fig. 9;
Figure 12 is the adjustment comparator 409 circuit embodiment figure preferably among Fig. 8;
Figure 13 is 1103,1104,1105,1101 and 1102 circuit embodiment figure preferably among Figure 12;
Figure 14 is 1106 and 1107 circuit embodiment figure preferably among Figure 12;
Figure 15 is the low pass filter 407 and 410 circuit embodiment figure preferably among Fig. 4 and Fig. 8;
Figure 16 is the high pass filter 405 circuit embodiment figure preferably among Fig. 4 and Fig. 8;
Figure 17 merges rectifier and error amplifier among Fig. 4 and Fig. 8 with design circuit embodiment figure together.
Embodiment
Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.
Fig. 4 realizes first embodiment of adaptive equalizer Method and circuits for the present invention.The course of work and the principle of present embodiment are as follows:
At first by an equalization filter 401, this equalization filter has two signalling channels to the signal that receives: Gain Adjustable low pass filter 402 and Gain Adjustable high pass filter 403.402 and 403 output is by the output of adder 404 additions as equalization filter 401.The output of equalization filter 401 is respectively as the input of adjusting comparator 409 (its maximum amplitude of oscillation is limited in the predetermined value), high pass filter 405 and low pass filter 407.Adjust the output of a branch road of comparator 409 outputs as adaptive equalizer, another branch road is as the input of low pass filter 410.The output of high pass filter 405, low pass filter 407 and low pass filter 410 is input rectifier 406,408 and 411 respectively. Rectifier 408 and 411 output is respectively as two inputs of error amplifier 413, and the output of error amplifier 413 is through integration (perhaps 413 output is controlled discharging and recharging of the C1) back of the capacitor C 1 gain-adjusted signal as low pass filter 402; Rectifier 406 and 408 output is as two inputs of error amplifier 412, and the output of error amplifier 412 is through integration (perhaps 412 output is controlled discharging and recharging of the C2) back of the capacitor C 2 gain-adjusted signal as high pass filter 403.
The low-frequency gain regulation loop comprises: Gain Adjustable low pass filter 402, adjustment comparator 409, low pass filter 407 and 410, rectifier 408 and 411, error amplifier 413 and integrating capacitor C1.
The high-frequency gain regulation loop comprises: Gain Adjustable high pass filter 403, high pass filter 405, low pass filter 407 rectifiers 406 and 408, error amplifier 412 and integrating capacitor C2.
Fig. 4 medium and low frequency gain-adjusted loop is independent of the high-frequency gain regulation loop, but the stable state of high-frequency gain regulation loop work is the state that depends on low-frequency gain regulation loop steady operation.
In the low-frequency gain regulation loop, one of them branch road of the output of equalization filter 401 is as the input of low pass filter 407, the output of low pass filter 407 is as the input of rectifier 408, the another one branch road of 401 output is as the input of adjusting comparator 409, adjust comparator 409 outputs through low pass filter 410, the output of low pass filter 410 is as the input of rectifier 411, and rectifier 408 and 411 output are as the input of error amplifier 413.Like this, the input and output signal of adjusting comparator 409 passes through low-pass filtering and rectification respectively, and the energy of its low frequency part is extracted out.The difference of 409 input and output signal low frequency part energy is amplified output through error amplifier 413, the output of error amplifier 413 is through the integration (perhaps the output control capacitance C1's of error amplifier 413 discharges and recharges) of capacitor C 1, and the magnitude of voltage of C1 integration (discharging and recharging) gained is as 402 low-frequency gain control signal.This control signal is the function of rectifier 408 and 411 output signals.When the input and output signal low frequency part energy when 409 equated, the magnitude of voltage on the capacitor C 1 was in stable state, and 402 gain is also stable, and at this moment the low-frequency gain regulation loop is in steady-working state.
In the high-frequency gain regulation loop, one of them branch road of the output of equalization filter 401 is as the input of low pass filter 407, the output of low pass filter 407 is as the input of rectifier 408, the another one branch road of 401 output is as the input of high pass filter 405,405 output is as the input of rectifier 406, and rectifier 406 and 408 output are as the input of error amplifier 412.Like this, the output signal of equalization filter 401 is passed through low-pass filtering and rectification, high-pass filtering and rectification respectively, and the energy of its low frequency part and HFS is extracted out respectively.The difference of the output signal low-and high-frequency portion of energy of equalization filter 401 is amplified output through error amplifier 412, the output of error amplifier 412 is through the integration (perhaps the output control capacitance C2's of error amplifier 412 discharges and recharges) of capacitor C 2, and the magnitude of voltage of C2 integration (discharging and recharging) gained is as 403 high-frequency gain control signal.This control signal is the function of rectifier 406 and 408 output signals.(such as preset value is 1 when the ratio of the output signal low-and high-frequency portion of energy of equalization filter 401 reaches a fixing preset value, also be that the energy of low-and high-frequency composition is when equating), magnitude of voltage on the electric capacity is in stable state, 403 gain is also stable, and at this moment the high-frequency gain regulation loop is in steady-working state.
The low-frequency gain regulation loop of present embodiment is independent of the high-frequency gain regulation loop, but, the high-frequency gain regulation loop is only behind low-frequency gain regulation loop steady operation, energy size according to the low frequency part of signal stabilization could be adjusted to the high-frequency gain of high pass filter 403 on the stationary value.
The present invention realizes the adaptive equalizer Method and circuits, the cut-off frequency of low pass filter 407 and high pass filter 405 is constant even the boundary frequency fm of low frequency part and HFS changes with the message transmission rate of signal, the high-frequency gain regulation loop can be regulated the high-frequency gain of signal according to the energy of low frequency part, and finally reaches stable (in the maximum gain of high pass filter 403 certain or have auxiliary circuit to make under the certain situation of voltage max on the C2).So adaptive equalizer of the present invention has good self adaptation degree of regulation.
Embodiment 2
Fig. 5 realizes second embodiment of adaptive equalizer Method and circuits for the present invention.The operation principle of present embodiment is as follows:
At first by an equalization filter 501, this equalization filter has two signalling channels to the signal that receives: Gain Adjustable low pass filter 502 and Gain Adjustable high pass filter 503.502 and 503 output is by the output of adder 504 additions as equalization filter 501.The output of equalization filter 501 is respectively as the input of adjusting comparator 509 (its maximum amplitude of oscillation is limited in the predetermined value), low pass filter 505 and high pass filter 507.Adjust the output of a branch road of comparator 509 outputs as adaptive equalizer, the another one branch road is as the input of high pass filter 510.The output of low pass filter 505, high pass filter 507 and high pass filter 510 is input rectifier 506,508 and 511 respectively.Rectifier 508 and 511 output is as two inputs of error amplifier 513, and the output of error amplifier 513 is through integration (perhaps the output control capacitance C2's of error amplifier 513 the discharges and recharges) back of the capacitor C 2 gain-adjusted signal as high pass filter 503; Rectifier 506 and 508 output is as two inputs of error amplifier 512, and the output of error amplifier 512 is through integration (perhaps the output control capacitance C1's of error amplifier 512 the discharges and recharges) back of the capacitor C 1 gain-adjusted signal as low filter 502.
The low-frequency gain regulation loop comprises: Gain Adjustable low pass filter 502, low pass filter 505, high pass filter 507, rectifier 506 and 508, error amplifier 512 and integrating capacitor C1.
The high-frequency gain regulation loop comprises: Gain Adjustable high pass filter 503, adjustment comparator 509, high pass filter 507 and 510, rectifier 508 and 511, error amplifier 513 and integrating capacitor C2.
Fig. 5 medium-high frequency gain-adjusted loop is independent of the low-frequency gain regulation loop, but the stable state of low-frequency gain regulation loop work is the state that depends on high-frequency gain regulation loop steady operation.
In the high-frequency gain regulation loop, one of them branch road of the output of equalization filter 501 is as the input of high pass filter 507, and the output of high pass filter 507 is as the input of rectifier 508.The another one branch road of 501 output is as the input of adjusting comparator 509, adjust comparator 509 outputs through high pass filter 510, the output of high pass filter 510 is as the input of rectifier 511, and rectifier 508 and 511 output are as the input of error amplifier 513.Like this, the input and output signal of adjusting comparator 509 passes through high-pass filtering and rectification respectively, and the energy of its HFS is extracted out.The difference of 509 input and output signal HFS energy is amplified output through error amplifier 513, the output of error amplifier 513 is through the integration (perhaps the output control capacitance C2's of error amplifier 513 discharges and recharges) of capacitor C 2, and the magnitude of voltage of C2 integration (discharging and recharging) gained is as 503 high-frequency gain control signal.This control signal is the function of rectifier 508 and 511 output signals.When the slope of the input and output signal when 509 equated, the magnitude of voltage on the electric capacity was in stable state, and 503 gain is also stable, and at this moment the high-frequency gain regulation loop is in steady-working state.
In the low-frequency gain regulation loop, one of them branch road of the output of equalization filter 501 is as the input of high pass filter 507, the output of high pass filter 507 is as the input of rectifier 508, the another one branch road of 501 output is as the input of low pass filter 505,505 output is as the input of rectifier 506, and rectifier 506 and 508 output are as the input of error amplifier 512.Like this, the output signal of equalization filter 501 is passed through low-pass filtering and rectification, high-pass filtering and rectification respectively, and the energy of its low frequency part and HFS is extracted out respectively.The difference of the output signal low-and high-frequency portion of energy of equalization filter 501 is amplified output through error amplifier 512, the output of error amplifier 512 is through the integration (perhaps the output control capacitance C1's of error amplifier 512 discharges and recharges) of capacitor C 1, and the magnitude of voltage of C1 integration (discharging and recharging) gained is as 502 low-frequency gain control signal.This control signal is the function of rectifier 506 and 508 output signals.(such as preset value is 1 when the ratio of the output signal low-and high-frequency portion of energy of equalization filter 501 reaches a fixing preset value, also be that the energy of low-and high-frequency composition is when equating), magnitude of voltage on the electric capacity is in stable state, 502 gain is also stable, and at this moment the low-frequency gain regulation loop is in steady-working state.
The high-frequency gain regulation loop of present embodiment is independent of the low-frequency gain regulation loop, but, the low-frequency gain regulation loop is only behind high-frequency gain regulation loop steady operation, energy size according to the HFS of signal stabilization could be adjusted to the low-frequency gain of high pass filter 502 on the stationary value.
The present invention realizes the adaptive equalizer Method and circuits, the cut-off frequency of low pass filter 505 and high pass filter 507 is constant even the boundary frequency fm of low frequency part and HFS changes with the message transmission rate of signal, the low-frequency gain regulation loop can be regulated the low-frequency gain of signal according to the energy of HFS, and finally reaches stable (at the least gain of low pass filter 502 certain or have auxiliary circuit to make under the certain situation of voltage minimum on the C1).So adaptive equalizer of the present invention has good self adaptation degree of regulation.
Embodiment 3
Fig. 6 realizes the 3rd embodiment of adaptive equalizer Method and circuits for the present invention.The operation principle of present embodiment is as follows:
As Fig. 6, circuit is on Fig. 4 circuit base (among Fig. 6 and Fig. 4, identical and play the component units of same function at circuit, the number of sign is the same) increased by six component units, they are error amplifier 614, rectifier 615, comparator 616, delay circuit 617 and switch 618,619.
In the present embodiment, circuit comprises two low-frequency gain regulation loop and a high-frequency gain regulation loop; The course of work of the adaptive equalizer of present embodiment is divided into two stages: first stage is the same with the operation principle of first embodiment circuit.After under the working stability of gain-adjusted loop in first stage, the gain-adjusted loop enters second working stage.In this stage, high-frequency gain regulation loop and low-frequency gain regulation loop are not independently, but the work of coordinating mutually.
First low-frequency gain regulation loop comprises Gain Adjustable low pass filter 402, adjusts comparator 409, low pass filter 407 and 410, rectifier 408 and 411, error amplifier 413, switch 618 and integrating capacitor C1; Second low-frequency gain regulation loop comprises Gain Adjustable high pass filter 402, high pass filter 405, low pass filter 407 rectifiers 406 and 408, error amplifier 614, switch 619 and integrating capacitor C1.At first working stage, switch 618 is opened, and 619 turn-off, and first low-frequency gain regulation loop is by gating; At second working stage, switch 618 turn-offs, and 619 open, and second low-frequency gain regulation loop is by gating; In the design of side circuit, switch 618 and 619 can be embedded error amplifier, come these two low-frequency gain regulation loop are carried out gating by the output that enables error amplifier.
The high-frequency gain regulation loop comprises Gain Adjustable high pass filter 403, high pass filter 405, low pass filter 407, rectifier 406 and 408, error amplifier 412 and integrating capacitor C2.
The operation principle of first working stage is as follows:
409 output is through rectifier 615 rectifications, 615 output is compared with reference voltage d by comparator 616, when circuit electrifying startup (perhaps resetting), when perhaps adaptive equalizer is not also received any signal, comparator 616 is output as zero, the positive output of delay circuit 617 is zero, and negative output is a high level.At this moment, switch 618 is opened, and switch 619 is turned off, first low-frequency gain regulation loop work.This situation will last till always that adaptive equalizer receives signal, and after comparator 616 output high level, this high level postponed a period of times by delay circuit 617, the positive output of delay circuit 617 was high level, and negative output is zero.If so constant time of delay of hypothesis delay circuit is Td, then circuit working is Td in the time in first stage at least.
In first stage, the low-frequency gain regulation loop is independent of the high-frequency gain regulation loop.But the high-frequency gain regulation loop is only behind low-frequency gain regulation loop steady operation, and according to the energy size of the low frequency part of signal stabilization, the high-frequency gain that could incite somebody to action is adjusted on the stationary value.
In the low-frequency gain regulation loop, one of them branch road of the output of equalization filter 401 is as the input of low pass filter 407, the output of low pass filter 407 is as the input of rectifier 408, the another one branch road of 401 output is as the input of adjusting comparator 409, adjust comparator 409 outputs through low pass filter 410, the output of low pass filter 410 is as the input of rectifier 411, and rectifier 408 and 411 output are as the input of error amplifier 413.Like this, the input and output signal of adjusting comparator 409 passes through low-pass filtering and rectification respectively, and the energy of its low frequency part is extracted out.The difference of 409 input and output signal low frequency part energy is amplified output through error amplifier 413, the output of error amplifier 413 is through the integration (perhaps the output control capacitance C1's of error amplifier 413 discharges and recharges) of capacitor C 1, and the magnitude of voltage of C1 integration (discharging and recharging) gained is as 402 low-frequency gain control signal.This control signal is the function of rectifier 408 and 411 output signals.When the input and output signal low frequency part energy when 409 equated, the magnitude of voltage on the electric capacity was in stable state, and 402 gain is also stable, and at this moment the low-frequency gain regulation loop is in steady-working state.
In the high-frequency gain regulation loop, one of them branch road of the output of equalization filter 401 is as the input of low pass filter 407, the output of low pass filter 407 is as the input of rectifier 408, the another one branch road of 401 output is as the input of high pass filter 405,405 output is as the input of rectifier 406, and rectifier 406 and 408 output are as the input of error amplifier 412.Like this, the output signal of equalization filter 401 is passed through low-pass filtering and rectification, high-pass filtering and rectification respectively, and the energy of its low frequency part and high frequency low frequency part is extracted out respectively.The difference of the output signal low-and high-frequency portion of energy of equalization filter 401 is amplified output through error amplifier 412, the output of error amplifier 412 is through the integration (perhaps the output control capacitance C2's of error amplifier 412 discharges and recharges) of capacitor C 2, and the magnitude of voltage of C2 integration (discharging and recharging) gained is as 403 high-frequency gain control signal.This control signal is the function of rectifier 406 and 408 output signals.(such as preset value is 1 when the ratio of the output signal low-and high-frequency portion of energy of equalization filter 401 reaches the preset value of a fixed value, also be that the energy of low-and high-frequency composition is when equating) etc. the time, magnitude of voltage on the electric capacity is in stable state, 403 gain is also stable, and at this moment the high-frequency gain regulation loop is in steady-working state.
The operation principle of second working stage is as follows:
After adaptive equalizer receives signal, comparator 616 output high level, after this high level reached the time delay of Td by delay circuit 617, the positive output of delay circuit 617 was by the zero high level that changes into, negative output is for being changed into zero by high level.At this moment, circuit enters into second working stage.In this stage, second low-frequency gain regulation loop being made up of Gain Adjustable high pass filter 402, high pass filter 405, low pass filter 407, rectifier 406 and 408, error amplifier 614, switch 619 and integrating capacitor C1 be by gating, and Gain Adjustable low pass filter 402, to adjust first low-frequency gain regulation loop that comparator 409, low pass filter 407 and 410, rectifier 408 and 411, switch 618, error amplifier 413, switch 618 and integrating capacitor C1 form disabled.
At this working stage, the composition of high-frequency gain regulation loop is the same with first working stage.Except error amplifier 614 with the polarity of rectifier 406 and 408 connections and error amplifier 412 follow the polarity of rectifier 406 and 408 connections opposite, the low-frequency gain regulation loop in this stage is formed composition with the high-frequency gain regulation loop in this stage the same (after switch 619 opens, regard with error amplifier 614 directly link to each other C1).
In this stage, high-frequency gain regulation loop and low-frequency gain regulation loop are not independently, but the work of coordinating mutually.
In the high-frequency gain regulation loop, the output of rectifier 406 links to each other with the inverting input of error amplifier 412, and the output of rectifier 408 links to each other with error amplifier 412 positive terminal.But in the low-frequency gain regulation loop, the output of rectifier 406 links to each other with the normal phase input end of error amplifier 614, and the output of rectifier 408 links to each other with error amplifier 614 end of oppisite phase.
When the HFS energy of the output signal of equalization filter 401 during greater than the low frequency part energy, the output of low-frequency gain regulation loop by error amplifier 614 is to capacitor C 1 charging (perhaps the output of error amplifier 614 control constant-current source charges to C1), and the output of the high-frequency gain regulation loop of circuit by error amplifier 412 is to capacitor C 2 discharges (perhaps the output of error amplifier 412 control constant-current source C2 is discharged); When the low frequency part energy of the output signal of equalization filter 401 during greater than the HFS energy, the output of low-frequency gain regulation loop by error amplifier 614 is to capacitor C 1 discharge (perhaps the output of error amplifier 614 control constant-current source discharges to C1), and the output of the high-frequency gain regulation loop of circuit by error amplifier 412 is to capacitor C 2 chargings (perhaps the output of error amplifier 412 control constant-current source C2 is charged); (such as preset value is 1 when the ratio of the low frequency part of the output signal of equalization filter 401 and HFS energy reaches a fixing preset value, also be that the energy of low-and high-frequency composition is when equating) time, electric weight on C1 and the C2 no longer changes, and the work in second stage of circuit is in stable state.
Like this, after the value of giving through first working stage, again through the adjustment in second stage, magnitude of voltage on C1 and the C2 can make the low frequency part and the HFS energy of output signal of weighing apparatus filter 401 be tending towards equal more, and present embodiment realizes that the method for adaptive equalizer makes the raising of having got back of self adaptation degree of regulation.
Embodiment 4
Fig. 7 realizes the 4th embodiment of adaptive equalizer Method and circuits for the present invention.The same with embodiment 3, present embodiment is on Fig. 5 circuit base (among Fig. 7 and Fig. 5, identical and play the component units of same function at circuit, the number of sign is the same) increased by five component units, they are error amplifier 714, rectifier 715, comparator 716, delay circuit 717 and switch 718 and switch 719.
In the present embodiment, circuit comprises two high-frequency gain regulation loop and a low-frequency gain regulation loop; The course of work of the adaptive equalizer of present embodiment is divided into two stages: first stage is the same with the operation principle of embodiment 2 circuit.After under the working stability of gain-adjusted loop in first stage, the gain-adjusted loop enters second working stage, and in this stage, high-frequency gain regulation loop and low-frequency gain regulation loop are not independently, but the work of coordinating mutually.
Embodiment 4 basic principles are not here given unnecessary details with embodiment 3, and from above-mentioned four embodiment, those of ordinary skills can expect other relevant substitutions and modifications, and these all should be the scope of protection of the invention.
In the embodiments of the invention, realization is to the method that compares or the circuit of the energy of the low-frequency component of equalizing signal and radio-frequency component, be to extract, and then the low-frequency component of equalizing signal and the energy of radio-frequency component are compared by low-frequency component and radio-frequency component with equalizing signal.Also can expect according to the present invention, the low-frequency component of equalizing signal is extracted, and then the low-frequency component of equalizing signal and the gross energy of equalizing signal compared, or the radio-frequency component of equalizing signal extracted, and then the radio-frequency component of equalizing signal and the gross energy of equalizing signal compared, can reach the purpose that compares too to the energy of the low-frequency component of equalizing signal and radio-frequency component.Here be not limited to embodiments of the invention, but can therefrom obtain its common thought from these several embodiment that enumerate.
In the application of reality, the signal that adaptive equalizer receives is generally differential signal, add that the present invention realizes that the method for adaptive equalizer generally realizes at integrated circuit, in order to further describe the detailed implementation method of each component units in the embodiment of the invention, embodiments of the invention 1 corresponding Fig. 4 changed be depicted as Fig. 8.Each basic composition unit among Fig. 8 is all changed into the input and output of difference by input and output single-ended among Fig. 4, and will adjust comparator 409 and draw in further detail.Among Fig. 8 with Fig. 4 in consistent corresponding unit number mark be the same.The signal that adaptive equalizer comes receiving cable to transmit by the difference input to " positive input " and " negative input ", the signal that the process adaptive equalizer is handled is by " positive output " and " negative output " output differential signal.
We are to be appreciated that the just schematic diagram that Fig. 4 and Fig. 8 equalization filter 401 are drawn, and it might not be to be interconnected by discrete unit 402,403 and 404 to form.Equalization filter 401 among Fig. 4 and Fig. 8 is circuit embodiment such as Fig. 9 preferably.Equalization filter is in series by four identical equalization filter unit 801,802,803 and 804 among the figure.The number of the equalization filter unit of series connection can be adjusted by low-and high-frequency gain and the circuit working bandwidth requirement partly according to signal when design.The high-frequency gain of equalization filter unit is regulated by " high-frequency gain control signal ", and the low-frequency gain of equalization filter unit is regulated by " low-frequency gain control signal ".NMOS pipe offset generating circuit 805 can produce the bias voltage " NBIAS " corresponding to " reference voltage a ", and " NBIAS " provides voltage bias for equalization filter unit 801,802,803 and 804.Equalization filter unit 801,802,803 and 804 is circuit embodiment such as Figure 10 preferably.NMOS pipe offset generating circuit 805 is circuit embodiment such as Figure 11 preferably.
Equalization filter unit among Figure 10 merges low-frequency gain regulatory function and high-frequency gain regulatory function with design is in the same place." low-frequency gain control signal " changes 903 conducting resistance by the grid voltage of adjusting metal-oxide-semiconductor 903, thus the gain of control low frequency channel; " high-frequency gain control signal " changes the equivalent capacity of variable capacitance diode by the voltage drop of adjusting variable capacitance diode 901 two ends and 902 two ends, and (another realizes that the method for variable capacitance is to use capacitance matrix, be combined into the electric capacity of different capacitances by digital controlled signal and gating switch), thus the gain of control high frequency channel; Passive resistance Rb is that the gain of low frequency channel is provided with a minimum initial value, has entered a state of not wishing to occur to avoid the self adaptation regulation loop, is zero or very low such as the low-frequency gain of signal.In Figure 11, " NBIAS " of NMOS pipe offset generating circuit 805 provides voltage bias for " NBIAS " of the equalization filter unit among Figure 10.
Adjustment comparator 409 among Fig. 4 and Fig. 8 is circuit embodiment such as Figure 12 preferably.Among Figure 12, adjust comparator unit 1101 and 1102 and be composed in series the adjustment comparator, be used for the gain-adjusted loop.And output buffer cell 1103,1104 and the 1105 output bufferings as adaptive equalizer, to adapt to adaptive equalizer load and amplifying signal.Because adjusting the load of comparator is high pass or low pass filter, so the distortion that such structure caused in the time of can reducing signal by the adjustment comparator.NMOS offset generating circuit 1106 provides " NBIAS " bias voltage for adjusting comparator unit, and NMOS offset generating circuit 1107 provides " NBIAS " bias voltage for the output buffer cell; Buffer cell 1103,1104 is the same with 1105 with the circuit embodiment of adjusting comparator unit 1101 and 1102, its circuit such as Figure 13.The circuit structure of Figure 13 adopts the passive resistance load, thereby has improved the bandwidth of operation of circuit, and the maximum level of its output is the operating voltage of circuit, and minimum level is to be determined jointly by load and " NBIAS ".NMOS offset generating circuit 1106 and 1107 is circuit embodiment such as Figure 14 preferably, buffer cell 1103,1104 and 1105 and " NBIAS " voltage of adjusting comparator unit 1101 and 1102 produce by the circuit of Figure 14, the method that this circuit adopts biasing to duplicate to provide bias voltage for other circuit.
Claims (15)
1, a kind of Adpative equalizing circuit is characterized in that, comprising:
The low-pass filter unit of Gain Adjustable is regulated it by the low-frequency gain regulation loop and is gained and come the low-frequency component of control input signals;
The high pass filter unit of Gain Adjustable is regulated it by the high-frequency gain regulation loop and is gained and come the radio-frequency component of control input signals;
The first low-frequency gain regulation loop, the low-frequency component by equalizing signal extracts the gain that comparison circuit comes the adjustable low-pass filter unit of ride gain;
The first high-frequency gain regulation loop by the high and low frequency composition extraction circuit and the comparison circuit of equalizing signal, is come the gain of the adjustable high pass filter unit of ride gain;
Has a signal mixed circuit unit at least with the signal output that permeates of the high pass filter unit output signal of the low-pass filter unit of Gain Adjustable and Gain Adjustable.
2, Adpative equalizing circuit as claimed in claim 1 is characterized in that, also comprises:
The second low-frequency gain regulation loop is by the high and low frequency composition extraction circuit and the comparison circuit of equalizing signal, the gain that comes the adjustable low-pass filter unit of ride gain;
A selection control circuit, this circuit are controlled the switching between the first low-frequency gain regulation loop and the second low-frequency gain regulation loop;
Described second low-frequency gain regulation loop and the mutual co-ordination of the first high-frequency gain regulation loop.
3, Adpative equalizing circuit as claimed in claim 1 or 2 is characterized in that, the low-frequency component of described equalizing signal extracts comparison circuit, extracts low-frequency component by the low frequency extraction circuit respectively and compares at the input/output terminal of adjusting comparator.
4, a kind of Adpative equalizing circuit is characterized in that, comprising:
The low-pass filter unit of Gain Adjustable is regulated it by the low-frequency gain regulation loop and is gained and come the low-frequency component of control input signals;
The high pass filter unit of Gain Adjustable is regulated it by the high-frequency gain regulation loop and is gained and come the radio-frequency component of control input signals;
The first low-frequency gain regulation loop is by the high and low frequency composition extraction circuit and the comparison circuit of equalizing signal, the gain that comes the adjustable low-pass filter unit of ride gain;
The first high-frequency gain regulation loop, the radio-frequency component by equalizing signal extracts the gain that the comparison circuit circuit comes the adjustable high pass filter unit of ride gain;
Has a signal mixed circuit unit at least with the signal output that permeates of the high pass filter unit output signal of the low-pass filter unit of Gain Adjustable and Gain Adjustable.
5, Adpative equalizing circuit as claimed in claim 4 is characterized in that, also comprises:
The second high-frequency gain regulation loop by the high and low frequency composition extraction circuit and the comparison circuit of equalizing signal, is come the gain of the adjustable high pass filter unit of ride gain;
A selection control circuit, this circuit are controlled the switching between the first high-frequency gain regulation loop and the second high-frequency gain regulation loop;
Described second high-frequency gain regulation loop and the mutual co-ordination of the first low-frequency gain regulation loop.
As claim 4 or 5 described Adpative equalizing circuits, it is characterized in that 6, the radio-frequency component of described equalizing signal extracts comparison circuit, extract radio-frequency component by the high frequency extraction circuit respectively and compare at the input/output terminal of adjusting comparator.
7, as claim 1,2,4 or 5 described Adpative equalizing circuits, it is characterized in that, the high and low frequency composition extraction circuit and the comparison circuit of described equalizing signal, by radio-frequency component extraction circuit and low-frequency component extraction circuit radio-frequency component in the equalizing signal and low-frequency component are extracted, and compare the radio-frequency component of equalizing signal and the energy of low-frequency component by comparator.
As claim 3,6 or 7 described Adpative equalizing circuits, it is characterized in that 8, the radio-frequency component extraction circuit of described equalizing signal is the series connection successively of high pass filter and rectifier; The low-frequency component extraction circuit of described equalizing signal is the series connection successively of low pass filter and rectifier.
9, a kind of adaptive equilibrium method of Adpative equalizing circuit realization is characterized in that, may further comprise the steps:
S1: possess two gain-adjusted loops at least, wherein pass through the gain of the adjustable low-pass filter unit of the first low-frequency gain regulation loop ride gain, come the gain size of control input signals low-frequency component, by the gain of the adjustable high pass filter unit of the first high-frequency gain regulation loop ride gain, the gain size of coming the control input signals radio-frequency component;
S2: the first low-frequency gain regulation loop reaches stable operating state by the circuit of self, the final operating state of the first high-frequency gain regulation loop depends on the operating state of the first low-frequency gain regulation loop circuit, after the first low-frequency gain regulation loop steady operation, the first high-frequency gain regulation loop just can reach stable operating state, and at this moment the first low-frequency gain loop and the first high-frequency gain loop all reach steady-working state;
S3: then by the signal after the signal mixed circuit unit output equilibrium of low-pass filter unit and high pass filter unit.
10, adaptive equilibrium method as claimed in claim 9 is characterized in that, after step S2, also comprises step:
S21: at the first low-frequency gain regulation loop and the first high-frequency gain regulation loop steady operation after a period of time, select control circuit that the second low-frequency gain regulation loop is started working, the first low-frequency gain regulation loop quits work, by the low-frequency component of comparison equalizing signal and the difference of radio-frequency component, the second low-frequency gain regulation loop and the first high-frequency gain regulation loop begin mutual co-ordination, when the ratio of the energy of low-frequency component and radio-frequency component reached a fixing preset value, the second low-frequency gain regulation loop and the first high-frequency gain regulation loop could all be in stable operating state.
11, as claim 9 or 10 described adaptive equilibrium methods, it is characterized in that, described step S2 comprises further: the first low-frequency gain regulation loop is independently worked, and the gain of the low-frequency component of input signal is regulated, and finally obtained stable low-frequency gain; After first low-frequency gain is stable, size according to low-frequency component energy stable in the equalizing signal, the difference of the low-frequency component by equalizing signal relatively and the energy of radio-frequency component, when the ratio of the energy of the low-frequency component of equalizing signal and radio-frequency component reached a fixing preset value, the first high-frequency gain regulation loop could be adjusted to the high-frequency gain of input signal certain stable value.
12, a kind of adaptive equilibrium method of Adpative equalizing circuit realization is characterized in that, may further comprise the steps:
S1: possess two gain-adjusted loops at least, wherein pass through the gain of the adjustable low-pass filter unit of the first low-frequency gain regulation loop ride gain, come the gain size of control input signals low-frequency component, by the gain of the adjustable high pass filter unit of the first high-frequency gain regulation loop ride gain, the gain size of coming the control input signals radio-frequency component;
S2: the first high-frequency gain regulation loop reaches stable operating state by the circuit of self, the final operating state of the first low-frequency gain regulation loop depends on the operating state of the first high-frequency gain regulation loop, after the first high-frequency gain regulation loop steady operation, the first low-frequency gain regulation loop just can reach stable operating state, and at this moment the first low-frequency gain loop and the first high-frequency gain loop all reach steady-working state;
S3: then by the signal after the signal mixed circuit unit output equilibrium of low-pass filter unit and high pass filter unit.
13, adaptive equilibrium method as claimed in claim 12 is characterized in that, after step S2, also comprises step:
S21: at the first low-frequency gain regulation loop and the first high-frequency gain regulation loop steady operation after a period of time, by selecting control circuit to switch to the second high-frequency gain regulation loop, the first high-frequency gain regulation loop quits work, by the low-frequency component of comparison equalizing signal and the difference of radio-frequency component, the second high-frequency gain regulation loop and the first low-frequency gain regulation loop begin mutual co-ordination, when the ratio of the energy of low-frequency component and radio-frequency component reached a fixing preset value, the second low-frequency gain regulation loop and the first high-frequency gain regulation loop could all be in stable operating state.
14, as claim 12 or 13 described adaptive equilibrium methods, it is characterized in that, described step S2 comprises further: the first high-frequency gain regulation loop is independently worked, and the gain of the radio-frequency component that receives input signal is regulated, and finally obtained stable high-frequency gain; After first high-frequency gain is stable, size according to radio-frequency component energy stable in the equalizing signal, the difference of the low-frequency component by equalizing signal relatively and the energy of radio-frequency component, when the ratio of the energy of the low-frequency component of equalizing signal and radio-frequency component reached a fixing preset value, the first low-frequency gain regulation loop could be adjusted to the low-frequency gain of input signal certain stable value.
As claim 11 or 14 described adaptive equilibrium methods, it is characterized in that 15, the method for the difference of the low-frequency component of described relatively equalizing signal and the energy of radio-frequency component comprises:
The low-frequency component and the radio-frequency component of equalizing signal are extracted, and then the low-frequency component of equalizing signal and the energy of radio-frequency component are compared;
Or the low-frequency component of equalizing signal extracted, and then the low-frequency component of equalizing signal and the gross energy of equalizing signal are compared;
Or the radio-frequency component of equalizing signal extracted, and then the radio-frequency component of equalizing signal and the gross energy of equalizing signal are compared.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710179346 CN101459632B (en) | 2007-12-12 | 2007-12-12 | Adaptive equalizing circuit and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710179346 CN101459632B (en) | 2007-12-12 | 2007-12-12 | Adaptive equalizing circuit and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101459632A true CN101459632A (en) | 2009-06-17 |
| CN101459632B CN101459632B (en) | 2012-12-05 |
Family
ID=40770268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200710179346 Expired - Fee Related CN101459632B (en) | 2007-12-12 | 2007-12-12 | Adaptive equalizing circuit and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101459632B (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101834567A (en) * | 2010-06-03 | 2010-09-15 | 中国人民解放军国防科学技术大学 | Broadband gain adjustable low-noise amplifier |
| CN101917213A (en) * | 2010-08-12 | 2010-12-15 | 四川和芯微电子股份有限公司 | Adaptive equalization system and adaptive equalization method |
| CN102065039A (en) * | 2010-10-29 | 2011-05-18 | 北京大学 | High-speed interface circuit adaptive equalization method and circuit therefor |
| CN102271009A (en) * | 2010-06-02 | 2011-12-07 | 四川和芯微电子股份有限公司 | Balancing system |
| CN102299721A (en) * | 2011-09-22 | 2011-12-28 | 四川和芯微电子股份有限公司 | Equalizing circuit and equalizing system |
| CN102594743A (en) * | 2011-01-13 | 2012-07-18 | 群联电子股份有限公司 | Adaptive equalization circuit and adaptive equalization method |
| CN102801444A (en) * | 2012-07-06 | 2012-11-28 | 华为技术有限公司 | Analogue balancing device and method |
| CN103685104A (en) * | 2013-12-03 | 2014-03-26 | 苏州仙林力齐电子科技有限公司 | Two-step adaptive equalizer and logic control method thereof |
| CN103259497B (en) * | 2012-02-17 | 2016-03-30 | 国际商业机器公司 | Current integration amplifier circuit, M joint DFE circuit and semiconductor integrated circuit chip |
| WO2017071002A1 (en) * | 2015-10-28 | 2017-05-04 | Huawei Technologies Co., Ltd. | Combined low and high frequency continuous-time linear equalizers |
| CN107040941A (en) * | 2016-02-04 | 2017-08-11 | 工业和信息化部电信研究院 | A kind of low-and high-frequency fusing wireless cut-in method |
| CN108616467A (en) * | 2016-12-12 | 2018-10-02 | 中国航空工业集团公司西安航空计算技术研究所 | Continuous time adaptive equalizer |
| CN110780190A (en) * | 2018-07-27 | 2020-02-11 | 恩智浦有限公司 | Loss of signal detector with PVT compensation |
| CN114337597A (en) * | 2022-03-15 | 2022-04-12 | 北京国科天迅科技有限公司 | Multistage equalization circuit and signal processing circuit board |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1409511A (en) * | 2001-09-30 | 2003-04-09 | 深圳市中兴通讯股份有限公司上海第二研究所 | Self adaptive stube equalizer |
| CN100349447C (en) * | 2004-08-16 | 2007-11-14 | 西安电子科技大学 | Data balancing method for meteor trail communication |
| CN100358324C (en) * | 2004-08-16 | 2007-12-26 | 西安电子科技大学 | Data equalization method for burst communication |
| CN101083473B (en) * | 2006-05-30 | 2010-11-03 | 富士通株式会社 | System and method for adjusting compensation applied to a signal using filter patterns |
-
2007
- 2007-12-12 CN CN 200710179346 patent/CN101459632B/en not_active Expired - Fee Related
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102271009A (en) * | 2010-06-02 | 2011-12-07 | 四川和芯微电子股份有限公司 | Balancing system |
| CN102271009B (en) * | 2010-06-02 | 2013-11-13 | 四川和芯微电子股份有限公司 | Balancing system |
| CN101834567A (en) * | 2010-06-03 | 2010-09-15 | 中国人民解放军国防科学技术大学 | Broadband gain adjustable low-noise amplifier |
| CN101917213A (en) * | 2010-08-12 | 2010-12-15 | 四川和芯微电子股份有限公司 | Adaptive equalization system and adaptive equalization method |
| CN101917213B (en) * | 2010-08-12 | 2013-10-02 | 四川和芯微电子股份有限公司 | Adaptive equalization system and adaptive equalization method |
| CN102065039A (en) * | 2010-10-29 | 2011-05-18 | 北京大学 | High-speed interface circuit adaptive equalization method and circuit therefor |
| CN102065039B (en) * | 2010-10-29 | 2013-05-29 | 北京大学 | High-speed interface circuit adaptive equalization method and circuit therefor |
| CN102594743A (en) * | 2011-01-13 | 2012-07-18 | 群联电子股份有限公司 | Adaptive equalization circuit and adaptive equalization method |
| CN102299721A (en) * | 2011-09-22 | 2011-12-28 | 四川和芯微电子股份有限公司 | Equalizing circuit and equalizing system |
| CN103259497B (en) * | 2012-02-17 | 2016-03-30 | 国际商业机器公司 | Current integration amplifier circuit, M joint DFE circuit and semiconductor integrated circuit chip |
| CN102801444A (en) * | 2012-07-06 | 2012-11-28 | 华为技术有限公司 | Analogue balancing device and method |
| CN102801444B (en) * | 2012-07-06 | 2015-01-21 | 华为技术有限公司 | Analogue balancing device and method |
| CN103685104A (en) * | 2013-12-03 | 2014-03-26 | 苏州仙林力齐电子科技有限公司 | Two-step adaptive equalizer and logic control method thereof |
| WO2017071002A1 (en) * | 2015-10-28 | 2017-05-04 | Huawei Technologies Co., Ltd. | Combined low and high frequency continuous-time linear equalizers |
| US10116470B2 (en) | 2015-10-28 | 2018-10-30 | Futurewei Technologies, Inc. | Combined low and high frequency continuous-time linear equalizers |
| CN107040941A (en) * | 2016-02-04 | 2017-08-11 | 工业和信息化部电信研究院 | A kind of low-and high-frequency fusing wireless cut-in method |
| CN107040941B (en) * | 2016-02-04 | 2019-10-15 | 工业和信息化部电信研究院 | A kind of low-and high-frequency fusing wireless cut-in method |
| CN108616467A (en) * | 2016-12-12 | 2018-10-02 | 中国航空工业集团公司西安航空计算技术研究所 | Continuous time adaptive equalizer |
| CN108616467B (en) * | 2016-12-12 | 2021-03-26 | 中国航空工业集团公司西安航空计算技术研究所 | Continuous time adaptive equalizer |
| CN110780190A (en) * | 2018-07-27 | 2020-02-11 | 恩智浦有限公司 | Loss of signal detector with PVT compensation |
| CN114337597A (en) * | 2022-03-15 | 2022-04-12 | 北京国科天迅科技有限公司 | Multistage equalization circuit and signal processing circuit board |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101459632B (en) | 2012-12-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101459632B (en) | Adaptive equalizing circuit and method | |
| US8254402B2 (en) | Programmable high-speed cable with printed circuit board and boost device | |
| KR102634687B1 (en) | Automatic gain control circuit with interleaved linear gain codes | |
| CN103259508B (en) | There is the analog signal current integrator of adjustable peaking function | |
| US9647618B1 (en) | System and method for controlling common mode voltage via replica circuit and feedback control | |
| US9178563B2 (en) | Voltage regulator for a serializer/deserializer communication application | |
| WO2018052657A1 (en) | Variable gain amplifier with coupled degeneration resistance and capacitance | |
| CN103746671B (en) | Equalizing filter with high gain and wide compensation range | |
| US20070164802A1 (en) | Data recovery system for source synchronous data channels | |
| US20130207722A1 (en) | Peaking amplifier with capacitively-coupled parallel input stages | |
| US20040239369A1 (en) | Programmable peaking receiver and method | |
| US10771065B2 (en) | Charge pump circuits for clock and data recovery | |
| US9853842B2 (en) | Continuous time linear equalization for current-mode logic with transformer | |
| US20020158690A1 (en) | Programmable gain amplifier with glitch minimization | |
| CN100594685C (en) | Reactance adjustment device, transceiver and transmission device, reactance adjustment method, transmission method, and reception method | |
| CN101692660A (en) | Automatic equalization device and method | |
| CN110071705A (en) | Transmitting line and integrated circuit | |
| KR20170134420A (en) | Programmable high-speed equalizer and related method | |
| CN103716737B (en) | Volume control circuit and method | |
| US20110050194A1 (en) | Driver circuit and test apparatus | |
| US9049068B1 (en) | Multipath continuous time linear equalizer with allpass filter | |
| Kim et al. | A 10-Gb/s low-power adaptive continuous-time linear equalizer using asynchronous under-sampling histogram | |
| US7804892B1 (en) | Circuitry for providing programmable decision feedback equalization | |
| CN203691357U (en) | Automatic gain control circuit used for audio frequency processing | |
| CN113193730B (en) | System and method for improving transient response of switching power supply by adjusting filter capacitor differential pressure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121205 Termination date: 20161212 |