CN102687474A - Line driving method and device - Google Patents
Line driving method and device Download PDFInfo
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- CN102687474A CN102687474A CN201280000299XA CN201280000299A CN102687474A CN 102687474 A CN102687474 A CN 102687474A CN 201280000299X A CN201280000299X A CN 201280000299XA CN 201280000299 A CN201280000299 A CN 201280000299A CN 102687474 A CN102687474 A CN 102687474A
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Abstract
Embodiments of the present invention provide a line driving method and device, which relate to the field of electronics, and are capable of reducing overall power consumption of the line driving device. The line driving device comprises: a ClassAB line driver, and further comprises: a comparison unit, used to compare an input signal value with a reference value and output a comparison signal; a charge pump circuit, used to enable, according to the comparison signal, an initial voltage to jump to a preset voltage when the input signal value changes from a value smaller than the reference value to a value greater than the reference value and a current actual voltage is the initial voltage. The preset voltage is greater than the initial voltage. The charge pump circuit is further used to enable, according to a signal comparison result, the preset voltage to jump to the initial voltage when the input signal value changes from a value greater than the reference value to a value less than the reference value and the current actual voltage is the preset voltage. At least one reference value exists. The line driving method and device provided by the embodiments of the present invention are applied to digital subscriber lines.
Description
Technical field
The present invention relates to electronic applications, relate in particular to a kind of circuit driving method and device.
Background technology
XDSL is the general name of all kinds DSL (Digital Subscribe Line, digital subscriber line), comprises ADSL, RADSL, VDSL, SDSL, IDSL and HDSL etc.
In actual xDSL system, ClassAB (class AB) line driver is widely used.Because xDSL adopts DMT (Discrete MultiTone; Discrete multitone, DMT) technology is carried out the signal modulation; The peak-to-average force ratio of signal is high; When using the ClassAB line driver to carry out circuit design and supply voltage selection, the peak signal amplitude of oscillation in the time of can exporting maximum transmit power according to it designs, so the power consumption of this line driver is bigger.
In the existing scheme, can on ClassAB LD (Line Driver, line driver) basis, increase absolute value circuit, rail-to-rail amplifier and charge pump, to reduce the power consumption of ClassAB LD.Wherein, the voltage follow input signal carries out linear change, and when the input small-signal, ClassAB LD is with the low power supply power supply of outside input; When input during large-signal, it is high with the supply voltage pump of ClassAB LD that charge pump is followed input signal, when satisfying large-signal to the demand of supply voltage.The ratio of large-signal is less in the dmt signal of DSL, so the most of the time can be used the low power supply power supply of outside input.But because the input signal of voltage follow linear change carries out linear change, the power consumption of absolute value circuit, rail-to-rail amplifier and charge pump is bigger, and this circuit drive unit overall power is still very big.
Summary of the invention
Embodiments of the invention provide a kind of circuit driving method and device, can reduce the overall power of circuit drive unit.
For achieving the above object, embodiments of the invention adopt following technical scheme:
On the one hand, a kind of circuit drive unit is provided, comprises the class AB line driver, also comprise:
Comparing unit is used for input signal values and fiducial value are done comparison, the output comparison signal; Said input signal comprises: input difference positive signal, input difference negative signal or absolute value signal; Said comparison signal is indicated the relation of said input signal values and said fiducial value; Said absolute value signal is a bigger signal in said input difference positive signal and the input difference negative signal;
Charge pump circuit is used for according to said comparison signal, and from becoming greater than said fiducial value less than fiducial value, and current virtual voltage makes said initial voltage saltus step to predeterminated voltage when being initial voltage at said input signal values; Said virtual voltage is the difference of the positive supply virtual voltage and the negative supply virtual voltage of said class AB line driver; Said initial voltage is the externally operating voltage under the power supply power supply state of said class AB circuit drive unit; Said predeterminated voltage is greater than said initial voltage;
Said charge pump circuit also is used for according to the signal comparative result, and from becoming less than said fiducial value greater than said fiducial value, and current virtual voltage makes said predeterminated voltage saltus step to said initial voltage when being said predeterminated voltage at said input signal values;
Said fiducial value has one at least.
On the one hand, a kind of circuit driving method is provided, comprises:
Input signal values and fiducial value are done comparison, the output comparison signal; Said input signal comprises: input difference positive signal, input difference negative signal or absolute value signal; Said comparison signal is indicated the relation of said input signal values and said fiducial value;
According to said comparison signal, from becoming greater than said fiducial value less than fiducial value, and current virtual voltage makes said initial voltage saltus step to predeterminated voltage when being initial voltage at said input signal values; Said virtual voltage is the difference of the positive supply virtual voltage and the negative supply virtual voltage of said class AB line driver; Said initial voltage is the externally operating voltage under the power supply power supply state of said class AB circuit drive unit; Said predeterminated voltage is greater than said initial voltage;
According to the signal comparative result, from becoming less than said fiducial value greater than said fiducial value, and current virtual voltage makes said predeterminated voltage saltus step to said initial voltage when being said predeterminated voltage at said input signal values;
Said fiducial value has one at least.
Embodiments of the invention provide a kind of circuit driving method and device, and wherein this circuit drive unit comprises: the class AB line driver also comprises: comparing unit is used for input signal values and fiducial value are done comparison the output comparison signal; Said input signal comprises: input difference positive signal, input difference negative signal or absolute value signal; Said comparison signal is indicated the relation of said input signal values and said fiducial value; Charge pump circuit is used for according to said comparison signal, and from becoming greater than said fiducial value less than fiducial value, and current virtual voltage makes said initial voltage saltus step to predeterminated voltage when being initial voltage at said input signal values; Said virtual voltage is the difference of the positive supply virtual voltage and the negative supply virtual voltage of said class AB line driver; Said initial voltage is the externally operating voltage under the power supply power supply state of said class AB circuit drive unit; Said predeterminated voltage is greater than said initial voltage; Said charge pump circuit also is used for according to the signal comparative result, and from becoming less than said fiducial value greater than said fiducial value, and current virtual voltage makes said predeterminated voltage saltus step to said initial voltage when being said predeterminated voltage at said input signal values; Said fiducial value has one at least.So; Charge pump circuit is according to the comparison signal of comparing unit output and current voltage condition; From becoming less than fiducial value greater than fiducial value and input signal values when becoming less than fiducial value greater than fiducial value, make virtual voltage saltus step to predeterminated voltage and initial voltage respectively at input signal values, this voltage jump method is littler than saltus step of the prior art voltage linear changing method of the prior art power consumption; Therefore the charge pump circuit power consumption is lower; The comparing unit power consumption of this circuit drive unit is lower simultaneously, so, adopt this device can reduce the overall power of circuit drive unit.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
A kind of circuit driving device structure sketch map that Fig. 1 provides for the embodiment of the invention;
The another kind of circuit driving device structure sketch map that Fig. 2 provides for the embodiment of the invention;
Another circuit driving device structure sketch map that Fig. 3 provides for the embodiment of the invention;
The fiducial value that Fig. 4 provides for the embodiment of the invention is provided with the cellular construction sketch map;
The slope control unit structural representation that Fig. 5 provides for the embodiment of the invention;
Another circuit driving device structure sketch map that Fig. 6 provides for the embodiment of the invention;
A kind of circuit driving method flow chart that Fig. 7 provides for the embodiment of the invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
The embodiment of the invention provides a kind of circuit drive unit 10, and is as shown in Figure 1, comprises class AB line driver 101, also comprises:
Comparing unit 102 is used for input signal values and fiducial value are done comparison, the output comparison signal; Input signal comprises: input difference positive signal, input difference negative signal or absolute value signal; Said comparison signal is indicated the relation of said input signal values and said fiducial value; Said absolute value signal is a bigger signal in said input difference positive signal and the input difference negative signal.
Said comparison signal can be waveform signal, can be digital signal also, and the present invention does not limit at this.
So; Charge pump circuit is according to the comparison signal of comparing unit output and current voltage condition; From becoming less than fiducial value greater than fiducial value and input signal values when becoming less than fiducial value greater than fiducial value, make virtual voltage saltus step to predeterminated voltage and initial voltage respectively at input signal values, this voltage jump method is littler than voltage linear changing method power consumption of the prior art; Therefore the charge pump circuit power consumption is lower; The comparing unit power consumption of this circuit drive unit is lower simultaneously, so, adopt this device can reduce the overall power of circuit drive unit.
Special, on the one hand, comparing unit 102 can with the input difference positive signal in the circuit drive unit 10 place xDSL systems and the input difference negative signal be direct and fiducial value is done comparison, and the output comparative result is as comparison signal.
On the other hand, can also earlier input difference positive signal and input difference negative signal be compared at signal through before the comparing unit 102; The output comparison signal; At this moment, this circuit drive unit 10 also comprises: absolute value circuit 104 is used for the size of comparison input difference positive signal and input difference negative signal; Obtain absolute value signal, as shown in Figure 2.Adopt comparing unit to cooperate the method that obtains comparison signal with absolute value circuit, can reduce the live load of comparing unit, reduce the power consumption of comparing unit.
Need to prove that the said reference value can be fixed value, in comparing unit, pre-sets; Can also be dynamic value also, have particular kind of relationship with the variation of outer power voltage.Example, when input signal is input difference positive signal or input difference negative signal, can two fiducial values be set respectively for input difference positive signal or input difference negative signal, totally four fiducial values.When input signal is absolute value signal, can one or two fiducial value be set for absolute value signal.The present invention just illustrates the setting of fiducial value, does not do concrete restriction, and any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses, and the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
When fiducial value was dynamic value, as shown in Figure 3, this circuit drive unit 10 also comprises: fiducial value was provided with unit 105, is used to be provided with fiducial value.
Need to prove that in concrete xDSL system, the said reference value can have one, also can have a plurality ofly, exemplary, as shown in Figure 4 that when the circuit drive unit had two fiducial values, fiducial value was provided with unit 105 and can comprises:
First pressure filter circuit, 1051, the first pressure filter circuits 1051 comprise:
The resistance R 1 and the R2 of series connection, R1=R2, the end ground connection of R2, R1 is connected with the first pressure filter circuit input; The input of first pressure filter circuit connects external power source; Capacitor C 1, capacitor C 1 is parallelly connected with R2, is used for the power supply noise of filtering first pressure filter circuit; The first follower M1, the input of the first follower M1 is connected with the other end of R2, is used to increase the driving force of first pressure filter circuit, 1051 outputs; The output of the first follower M1 is positioned at the first pressure filter circuit output.
Second pressure filter circuit, 1052, the second pressure filter circuits 1052 comprise:
First Voltage stabilizing module, said first Voltage stabilizing module connects external power source VS+; The resistance R 3 and the R4 of series connection, R4/ (R3+R4)=1/TxGain; TxGain is the transmission gain of class AB line driver; The end of R4 is connected with the output of first pressure filter circuit; The input of second pressure filter circuit connects the first Voltage stabilizing module N1; Capacitor C 2, capacitor C 2 is parallelly connected with R4, is used for the power supply noise of filtering second pressure filter circuit; The second follower M2, the input of the second follower M2 is connected with the other end of R4, is used to increase the driving force of second pressure filter circuit, 1052 outputs; The output of the second follower M2 is positioned at second pressure filter circuit, 1052 outputs.Special, the first Voltage stabilizing module N1 can reach the unit of voltage stabilizing purpose for voltage stabilizing didoe, voltage stabilizing circuit etc.
Second pressure filter circuit 1052 satisfies formula:
Vup=((VS+)-(Vheadroom+ Δ offset1)-(VS+)/2) * (R4/ (R3+R4))+(VS+)/2; Vup is a first reference value; Δ offset1 is used to adjust first reference value for the first preset reference value.Can find out that according to above-mentioned formula first reference value changes with the variation of outer power voltage.
The 3rd pressure filter circuit 1053, the three pressure filter circuits 1054 comprise:
The second Voltage stabilizing module N2, said second Voltage stabilizing module connects external power source VS+; The resistance R 5 and the R6 of series connection, R6/ (R5+R6)=1/TxGain; TxGain is the transmission gain of class AB line driver; The end of R6 is connected with the output of second pressure filter circuit; The input of the 3rd pressure filter circuit connects the second Voltage stabilizing module N2; Capacitor C 3, capacitor C 3 is parallelly connected with R6, is used for the power supply noise of filtering the 3rd pressure filter circuit; The 3rd follower M3, the input of the 3rd follower M3 is connected with the other end of R6, is used to increase the driving force of the 3rd pressure filter circuit 1053 outputs; The output of the 3rd follower M3 is positioned at the 3rd pressure filter circuit 1053 outputs.Special, the second Voltage stabilizing module N2 can reach the unit of voltage stabilizing purpose for voltage stabilizing didoe, voltage stabilizing circuit etc.
The 3rd pressure filter circuit 1053 satisfies formula:
Vdown=((VS+)-(Vheadroom-Δ offset2)-(VS+)/2) * (R6/ (R5+R6))+(VS+)/2; Vdown is second fiducial value; Δ offset2 is used to adjust second fiducial value for the second preset reference value.Can find out that according to above-mentioned formula second fiducial value changes with the variation of outer power voltage.
Above-mentioned first pressure filter circuit 1051, second pressure filter circuit 1052 are connected with the 3rd pressure filter circuit 1053.The first Voltage stabilizing module N1 is connected external power source VS+ respectively with the second Voltage stabilizing module N2, and wherein, the voltage stabilizing value of the first Voltage stabilizing module N1 is Vheadroom+ Δ offset1; The voltage stabilizing value of the second Voltage stabilizing module N2 is Vheadroom-Δ offset2; Maximum signal level that Vheadroom can export for the class AB line driver and the difference between the outer power voltage VS+.
Need to prove; Above fiducial value is provided with the unit; Be merely embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses; Can expect easily changing or replacement, all should be encompassed within protection scope of the present invention.
Further; In order to reduce the supply voltage saltus step to class AB line driver Effect on Performance; This circuit drive unit 10 can also comprise: slope control unit 106 is used for when virtual voltage carries out saltus step the slope at adjustment virtual voltage saltus step edge; The virtual voltage bound-time of charge pump circuit is prolonged, and by certain slope variation.
Special, above-mentioned initial voltage is externally the positive supply initial voltage under the power supply power supply state and the difference of negative supply initial voltage of class AB circuit drive unit; Above-mentioned predeterminated voltage is the difference of the positive supply predeterminated voltage and the negative supply predeterminated voltage of class AB circuit drive unit, and is as shown in Figure 5, and this slope control unit 106 comprises:
In this slope control unit 106, when the first current mirror S1, the 3rd current mirror S3 open, when the second current mirror S2 and the 4th current mirror S4 closed, the first current mirror S1 was 4 chargings of first capacitor C, and the 3rd current mirror S3 is 5 chargings of second capacitor C.According to formula:
Can find out that voltage U is directly proportional with time t, so x end electromotive force increases in time all and increase, y end electromotive force all increases in time and reduces, thereby makes the U value increase in time and increase.
When the second current mirror S2 and the 4th current mirror S4 open; The first current mirror S1, the 3rd
time increases and reduces; Simultaneously; 5 discharges of second capacitor C, lower end current reflux to the four current mirror S4, y end electromotive force increases in time and increases.
Therefore; When input signal values from becoming greater than fiducial value less than fiducial value; And when current virtual voltage was initial voltage, the logic control subelement can make first and third current mirror open, and second, four current mirrors are closed; So that the adjustment initial voltage makes the time lengthening of initial voltage to the predeterminated voltage saltus step to the slope at predeterminated voltage saltus step edge.
When input signal values from becoming less than fiducial value greater than fiducial value; And when current virtual voltage is predeterminated voltage; The logic control subelement can make second, four current mirrors open; First and third current mirror is closed, so that adjustment makes predeterminated voltage prolong to the initial voltage bound-time from the slope of predeterminated voltage to initial voltage saltus step edge.
When input signal values when becoming greater than first reference value less than first reference value; The logic control subelement can make second, four current mirrors open; First and third current mirror is closed; So that the adjustment virtual voltage makes virtual voltage prolong to the initial voltage bound-time from predeterminated voltage from the slope of predeterminated voltage to initial voltage saltus step edge.
Example, when the circuit drive unit had two fiducial values, circuit drive unit 10 connected modes that the embodiment of the invention provides can be as shown in Figure 6.This circuit drive unit 10 comprises that class AB line driver 101, comparing unit 102, charge pump circuit 103, absolute value circuit 104, fiducial value are provided with unit 105 and slope control unit 106.
Wherein, the input of absolute value circuit 104 is connected with input difference negative signal INN with input difference positive signal INP respectively, supposes that input difference positive signal INP and input difference negative signal INN waveform are shown in waveform a among Fig. 6; After then absolute value circuit 104 compared the size of input difference positive signal and input difference negative signal, the absolute value signal of output was shown in waveform b among Fig. 6, and comparing unit 102 is provided with unit 105 with absolute value circuit 104, fiducial value and is connected; It is as shown in Figure 4 that this fiducial value is provided with unit 105 structures, and comparing unit 102 is done comparison with the fiducial value that above-mentioned absolute value signal value and fiducial value are provided with unit 105 outputs, the output comparison signal; The comparison signal of output is shown in waveform c among Fig. 6, and waveform c and square wave are similar, for reducing its saltus step edge to the charge pump circuit Effect on Performance; Comparing unit 102 outputs are connected with slope control unit 106 inputs, and these slope control unit 106 structures are as shown in Figure 5, and its output is connected with charge pump circuit 103; Charge pump circuit 103 is according to comparison signal; From becoming greater than fiducial value less than fiducial value, and current virtual voltage makes the initial voltage saltus step to predeterminated voltage when being initial voltage at input signal values; Simultaneously; From becoming less than fiducial value greater than fiducial value, and current virtual voltage makes the predeterminated voltage saltus step to initial voltage when being predeterminated voltage at input signal values.Because the effect of slope control unit 106 when virtual voltage carries out saltus step, has increased the slope at virtual voltage saltus step edge, the virtual voltage bound-time of charge pump circuit 103 is prolonged.
Special; Charge pump circuit 103 is basic identical with prior art among Fig. 6; Here repeat no more, the charge pump circuit 103 that the embodiment of the invention provides just illustrates, and any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses; Can expect easily changing or replacement, all should be encompassed within protection scope of the present invention.Charge pump circuit 103 signal output waveforms are shown in waveform d among Fig. 6, and the signal saltus step edge slope of waveform d is bigger, has reduced the influence to device performance.Charge pump circuit 103 output signal VCC and VEE, charge pump circuit 103 outputs connect class AB line driver 101.
Adopt the circuit drive unit among above-mentioned Fig. 6; At said input signal values from becoming less than fiducial value greater than said fiducial value; And when current virtual voltage is initial voltage; Pump is high and pump is low respectively with the power supply VCC of class AB line driver and VEE for charge pump circuit, makes said initial voltage saltus step to predeterminated voltage.
At said input signal values from becoming less than said fiducial value greater than said fiducial value; And when current virtual voltage is said predeterminated voltage; Charge pump circuit recovers normal condition with the power supply VCC and the VEE of class AB line driver, even said predeterminated voltage saltus step to said initial voltage; This moment, this class AB line driver was operated in the external power source pattern, and this moment, the operating voltage of line driver was that initial voltage is VCC-VEE=(VS+)-2Vdiode, and Vdiode is the diode drop in the charge pump circuit 103 among Fig. 6.
Special, in practical application, because the charge pump saltus step has certain time delay; The said reference value is provided with the unit can according to circumstances suitably reduce first reference value, second fiducial value that raises, like this; The charge pump corresponding action shifts to an earlier date, thereby reduces the time delay of charge pump saltus step.
The circuit drive unit that the embodiment of the invention provides; Charge pump circuit is according to the comparison signal of comparing unit output and current voltage condition; From becoming less than fiducial value greater than fiducial value and input signal values when becoming less than fiducial value greater than fiducial value, make virtual voltage saltus step to predeterminated voltage and initial voltage respectively at input signal values, this voltage jump method is littler than voltage linear changing method power consumption of the prior art; Therefore the charge pump circuit power consumption is lower; The comparing unit power consumption of this circuit drive unit is lower simultaneously, so, adopt this device can reduce the overall power of circuit drive unit.Simultaneously, this apparatus structure is simple, applying flexible, and noise is lower.
A kind of circuit driving method that the embodiment of the invention provides, as shown in Figure 7, comprising:
S701, input signal values and fiducial value are done comparison, the output comparison signal; Input signal comprises: input difference positive signal, input difference negative signal or absolute value signal; Said comparison signal is indicated the relation of said input signal values and said fiducial value.
S702, according to comparison signal, from becoming greater than fiducial value less than fiducial value, and current virtual voltage makes the initial voltage saltus step to predeterminated voltage when being initial voltage at input signal values.Said virtual voltage is the difference of the positive supply virtual voltage and the negative supply virtual voltage of said class AB line driver; Said initial voltage is the externally operating voltage under the power supply power supply state of said class AB circuit drive unit; Said predeterminated voltage is greater than said initial voltage.
S703, according to the signal comparative result, from becoming less than fiducial value greater than fiducial value, and current virtual voltage makes the predeterminated voltage saltus step to initial voltage when being predeterminated voltage at input signal values; Fiducial value has one at least.
So; Charge pump circuit is according to the comparison signal of comparing unit output and current voltage condition; From becoming less than fiducial value greater than fiducial value and input signal values when becoming less than fiducial value greater than fiducial value, make virtual voltage saltus step to predeterminated voltage and initial voltage respectively at input signal values, this voltage jump method is littler than voltage linear changing method power consumption of the prior art; Simultaneously; The power consumption of input signal values and fiducial value being done comparison procedure is also less, therefore, adopts this circuit driving method can reduce the overall power of circuit drive unit.
Special, before step S701, can also carry out the setting of fiducial value, relatively the size of input difference positive signal and input difference negative signal obtains said absolute value signal.
When above-mentioned virtual voltage carries out saltus step, can adjust the slope at virtual voltage saltus step edge, the virtual voltage bound-time of charge pump circuit is prolonged.In the time of can reducing the virtual voltage saltus step like this, to class AB line driver Effect on Performance.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be accomplished through the relevant hardware of program command; Aforesaid program can be stored in the computer read/write memory medium; This program the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
The above; Be merely embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses; Can expect easily changing or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of said claim.
Claims (13)
1. a circuit drive unit comprises the class AB line driver, it is characterized in that, comprising:
Comparing unit is used for input signal values and fiducial value are done comparison, the output comparison signal; Said input signal comprises: input difference positive signal, input difference negative signal or absolute value signal; Said comparison signal is indicated the relation of said input signal values and said fiducial value; Said absolute value signal is a bigger signal in said input difference positive signal and the input difference negative signal;
Charge pump circuit is used for according to said comparison signal, and from becoming greater than said fiducial value less than fiducial value, and current virtual voltage makes said initial voltage saltus step to predeterminated voltage when being initial voltage at said input signal values; Said virtual voltage is the difference of the positive supply virtual voltage and the negative supply virtual voltage of said class AB line driver; Said initial voltage is the externally operating voltage under the power supply power supply state of said class AB circuit drive unit; Said predeterminated voltage is greater than said initial voltage;
Said charge pump circuit also is used for according to the signal comparative result, and from becoming less than said fiducial value greater than said fiducial value, and current virtual voltage makes said predeterminated voltage saltus step to said initial voltage when being said predeterminated voltage at said input signal values;
Said fiducial value has one at least.
2. device according to claim 1 is characterized in that, also comprises:
Absolute value circuit is used for the size of comparison input difference positive signal and input difference negative signal, obtains said absolute value signal.
3. device according to claim 1 and 2 is characterized in that, also comprises:
Fiducial value is provided with the unit, is used to be provided with said fiducial value.
4. device according to claim 3 is characterized in that, when said circuit drive unit had two fiducial values, said fiducial value was provided with the unit and comprises:
First pressure filter circuit, said first pressure filter circuit comprises:
The resistance R 1 and the R2 of series connection, R1=R2, the end ground connection of said R2, said R1 is connected with the said first pressure filter circuit input; The input of said first pressure filter circuit connects external power source;
Capacitor C 1, said capacitor C 1 is parallelly connected with said R2, is used for the power supply noise of said first pressure filter circuit of filtering;
First follower, the input of said first follower is connected with the other end of said R2, is used to increase the driving force of said pressure filter circuit output; The output of said follower is positioned at the said first pressure filter circuit output;
Second pressure filter circuit, said second pressure filter circuit comprises:
First Voltage stabilizing module, said first Voltage stabilizing module connects said external power source;
The resistance R 3 and the R4 of series connection, R4/ (R3+R4)=1/TxGain; Said TxGain is the transmission gain of class AB line driver; The end of said R4 is connected with the output of said first pressure filter circuit; The input of said second pressure filter circuit connects said first Voltage stabilizing module;
Capacitor C 2, said capacitor C 2 is parallelly connected with said R4, is used for the power supply noise of said second pressure filter circuit of filtering;
Said second pressure filter circuit is connected with said first pressure filter circuit.
5. device according to claim 4 is characterized in that, said fiducial value is provided with the unit and also comprises:
The 3rd pressure filter circuit, said the 3rd pressure filter circuit comprises:
Second Voltage stabilizing module, said second Voltage stabilizing module connects said external power source;
The resistance R 5 and the R6 of series connection, R6/ (R5+R6)=1/TxGain; Said TxGain is the transmission gain of class AB line driver; The end of said R6 is connected with the output of said second pressure filter circuit; The input of said the 3rd pressure filter circuit connects said second Voltage stabilizing module;
Capacitor C 3, said capacitor C 3 is parallelly connected with said R6, is used for the power supply noise of said the 3rd pressure filter circuit of filtering;
Said the 3rd pressure filter circuit is connected with said second pressure filter circuit, said first pressure filter circuit.
6. device according to claim 5 is characterized in that,
Said second pressure filter circuit also comprises:
Second follower, the input of said second follower is connected with the other end of said R4, is used to increase the driving force of the said first pressure filter circuit output; The output of said second follower is positioned at the said second pressure filter circuit output;
Said the 3rd pressure filter circuit also comprises:
The 3rd follower, the input of said the 3rd follower is connected with the other end of said R6, is used to increase the driving force of said the 3rd pressure filter circuit output; The output of said follower is positioned at said the 3rd pressure filter circuit output.
7. according to any described device of claim of claim 1 to 6, it is characterized in that, also comprise:
The slope control unit is used for when said virtual voltage carries out saltus step, adjusts the slope at said virtual voltage saltus step edge, and said virtual voltage bound-time is prolonged.
8. device according to claim 7 is characterized in that, said initial voltage is externally the positive supply initial voltage under the power supply power supply state and the difference of negative supply initial voltage of said class AB circuit drive unit; Said predeterminated voltage is the difference of the positive supply predeterminated voltage and the negative supply predeterminated voltage of said class AB circuit drive unit,
Said slope control unit comprises:
First control circuit; Be used for when said positive supply initial voltage saltus step to said positive supply predeterminated voltage or the saltus step of said positive supply predeterminated voltage to said positive supply initial voltage; Adjust the slope at said positive voltage saltus step edge, said positive voltage bound-time is prolonged.
Second control circuit; Be used for when said negative supply initial voltage saltus step to said negative supply predeterminated voltage or the saltus step of said negative supply predeterminated voltage to said negative supply initial voltage; Adjust the slope at said negative supply voltage saltus step edge, said negative supply voltage bound-time is prolonged.
The logic control subelement is connected with said first and second control circuit, is used to control the adjustment of said first and second control circuit to the virtual voltage of said class AB line driver.
9. device according to claim 8 is characterized in that,
Said first control circuit comprises:
First current mirror, the said first current mirror positive electrode is connected with said external power source;
First electric capacity, the said first electric capacity positive electrode is connected with said charge pump circuit;
Second current mirror, the said second current mirror negative electrode ground connection, positive electrode is connected with the said first current mirror negative electrode, and said second current mirror is parallelly connected with said first electric capacity;
Said second control circuit comprises:
The 3rd current mirror, said the 3rd current mirror negative electrode ground connection;
Second electric capacity, the said second electric capacity negative electrode is connected with said charge pump circuit; Said first, second electric capacity is used for the said external power source noise of filtering;
The 4th current mirror, said the 4th current mirror positive electrode is connected with said external power source, and negative electrode is connected with said the 3rd current mirror positive electrode, and said the 4th current mirror is parallelly connected with said second electric capacity;
Wherein said first, second, third and fourth current mirror is connected with said logic control subelement.
10. a circuit driving method is characterized in that, comprising:
Input signal values and fiducial value are done comparison, the output comparison signal; Said input signal comprises: input difference positive signal, input difference negative signal or absolute value signal; Said comparison signal is indicated the relation of said input signal values and said fiducial value;
According to said comparison signal, from becoming greater than said fiducial value less than fiducial value, and current virtual voltage makes said initial voltage saltus step to predeterminated voltage when being initial voltage at said input signal values; Said virtual voltage is the difference of the positive supply virtual voltage and the negative supply virtual voltage of said class AB line driver; Said initial voltage is the externally operating voltage under the power supply power supply state of said class AB circuit drive unit; Said predeterminated voltage is greater than said initial voltage;
According to the signal comparative result, from becoming less than said fiducial value greater than said fiducial value, and current virtual voltage makes said predeterminated voltage saltus step to said initial voltage when being said predeterminated voltage at said input signal values;
Said fiducial value has one at least.
11. method according to claim 10 is characterized in that, said input signal values and fiducial value is done comparison, before the output comparison signal, said method also comprises:
Relatively the size of input difference positive signal and input difference negative signal obtains said absolute value signal.
12., it is characterized in that said method also comprises according to claim 10 or 11 described methods:
Said fiducial value is set.
13., it is characterized in that said method also comprises according to claim 10 or 11 described methods:
When said virtual voltage carries out saltus step, adjust the slope at said virtual voltage saltus step edge, said virtual voltage bound-time is prolonged.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2012/072350 WO2012103826A2 (en) | 2012-03-15 | 2012-03-15 | Line driving method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102687474A true CN102687474A (en) | 2012-09-19 |
| CN102687474B CN102687474B (en) | 2014-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201280000299.XA Active CN102687474B (en) | 2012-03-15 | 2012-03-15 | Line driving method and device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102687474B (en) |
| WO (1) | WO2012103826A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2019169929A1 (en) * | 2018-03-05 | 2019-09-12 | 华为技术有限公司 | Line drive apparatus |
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| US20020024381A1 (en) * | 2000-08-31 | 2002-02-28 | Kambiz Hayat-Dawoodi | Power efficient line driver with 4X supply voltage swing and active termination |
| CN101359932A (en) * | 2008-09-03 | 2009-02-04 | 华为技术有限公司 | DSL circuit driving device, method and access system |
| CN102217205A (en) * | 2010-04-19 | 2011-10-12 | 华为技术有限公司 | A method for improving power output efficiency of a line driver and a device thereof |
| CN102246477A (en) * | 2009-04-07 | 2011-11-16 | 华为技术有限公司 | Improving power efficiency of a line driver |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69318551T2 (en) * | 1993-07-29 | 1998-09-10 | St Microelectronics Srl | Integrated subscriber line interface circuit with slow polarity switch |
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- 2012-03-15 WO PCT/CN2012/072350 patent/WO2012103826A2/en active Application Filing
- 2012-03-15 CN CN201280000299.XA patent/CN102687474B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020024381A1 (en) * | 2000-08-31 | 2002-02-28 | Kambiz Hayat-Dawoodi | Power efficient line driver with 4X supply voltage swing and active termination |
| CN101359932A (en) * | 2008-09-03 | 2009-02-04 | 华为技术有限公司 | DSL circuit driving device, method and access system |
| CN102246477A (en) * | 2009-04-07 | 2011-11-16 | 华为技术有限公司 | Improving power efficiency of a line driver |
| CN102217205A (en) * | 2010-04-19 | 2011-10-12 | 华为技术有限公司 | A method for improving power output efficiency of a line driver and a device thereof |
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| WO2019169929A1 (en) * | 2018-03-05 | 2019-09-12 | 华为技术有限公司 | Line drive apparatus |
| CN110233806A (en) * | 2018-03-05 | 2019-09-13 | 华为技术有限公司 | A kind of route driving device |
| CN110233806B (en) * | 2018-03-05 | 2020-10-16 | 华为技术有限公司 | Circuit driving device |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2012103826A2 (en) | 2012-08-09 |
| CN102687474B (en) | 2014-07-30 |
| WO2012103826A3 (en) | 2013-02-21 |
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