CN102687474B - Line driving method and device - Google Patents

Line driving method and device Download PDF

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Publication number
CN102687474B
CN102687474B CN201280000299.XA CN201280000299A CN102687474B CN 102687474 B CN102687474 B CN 102687474B CN 201280000299 A CN201280000299 A CN 201280000299A CN 102687474 B CN102687474 B CN 102687474B
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voltage
signal
pressure filter
filter circuit
fiducial value
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CN102687474A (en
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赵治磊
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B3/00Line transmission systems
    • H04B3/02Details

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

A kind of circuit driving method and device
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 signal modulation, the peak-to-average force ratio of signal is high, while using 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 larger.
In existing scheme, absolute value circuit, rail-to-rail amplifier and charge pump can be increased on ClassAB LD (Line Driver, line driver) basis, to reduce the power consumption of ClassAB LD.Wherein, voltage follow input signal carries out linear change, when input small-signal, and the lower Power supply of outside input for ClassAB LD; When input is during large-signal, charge pump is followed input signal, and the supply voltage pump of ClassAB LD is high, the demand to supply voltage while meeting large-signal.In the dmt signal of DSL, the ratio of large-signal is less, so the most of the time can be used the lower 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 larger, this circuit drive unit overall power is still very large.
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, provide a kind of circuit drive unit, comprise class AB line driver, also comprise:
Comparing unit, for input signal values and fiducial value are compared, output comparison signal; Described input signal comprises: input difference positive signal, input difference negative signal or absolute value signal; Described comparison signal is indicated the relation of described input signal values and described fiducial value; Described absolute value signal is larger signal in described input difference positive signal and input difference negative signal;
Charge pump circuit, for according to described comparison signal, becomes and is greater than described fiducial value from being less than fiducial value at described input signal values, and current virtual voltage is while being initial voltage, makes described initial voltage saltus step to predeterminated voltage; Described virtual voltage is the difference of positive supply virtual voltage and the negative supply virtual voltage of described class AB line driver; Described initial voltage is the externally operating voltage under Power supply state of described class AB circuit drive unit; Described predeterminated voltage is greater than described initial voltage;
Described charge pump circuit is also for according to signal comparative result, become and be less than described fiducial value, and current virtual voltage is while being described predeterminated voltage, makes described predeterminated voltage saltus step to described initial voltage at described input signal values from being greater than described fiducial value;
Described fiducial value has one at least.
On the one hand, provide a kind of circuit driving method, comprising:
Input signal values and fiducial value are compared to output comparison signal; Described input signal comprises: input difference positive signal, input difference negative signal or absolute value signal; Described comparison signal is indicated the relation of described input signal values and described fiducial value;
According to described comparison signal, at described input signal values, from being less than fiducial value, becoming and be greater than described fiducial value, and current virtual voltage is while being initial voltage, makes described initial voltage saltus step to predeterminated voltage; Described virtual voltage is the difference of positive supply virtual voltage and the negative supply virtual voltage of described class AB line driver; Described initial voltage is the externally operating voltage under Power supply state of described class AB circuit drive unit; Described predeterminated voltage is greater than described initial voltage;
According to signal comparative result, at described input signal values, from being greater than described fiducial value, becoming and be less than described fiducial value, and current virtual voltage is while being described predeterminated voltage, makes described predeterminated voltage saltus step to described initial voltage;
Described 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: class AB line driver, also comprises: comparing unit, and for input signal values and fiducial value are compared, output comparison signal; Described input signal comprises: input difference positive signal, input difference negative signal or absolute value signal; Described comparison signal is indicated the relation of described input signal values and described fiducial value; Charge pump circuit, for according to described comparison signal, becomes and is greater than described fiducial value from being less than fiducial value at described input signal values, and current virtual voltage is while being initial voltage, makes described initial voltage saltus step to predeterminated voltage; Described virtual voltage is the difference of positive supply virtual voltage and the negative supply virtual voltage of described class AB line driver; Described initial voltage is the externally operating voltage under Power supply state of described class AB circuit drive unit; Described predeterminated voltage is greater than described initial voltage; Described charge pump circuit is also for according to signal comparative result, become and be less than described fiducial value, and current virtual voltage is while being described predeterminated voltage, makes described predeterminated voltage saltus step to described initial voltage at described input signal values from being greater than described fiducial value; Described fiducial value has one at least.So, charge pump circuit is according to the comparison signal of comparing unit output and current voltage condition, at input signal values, from being less than fiducial value, becoming and be greater than fiducial value and input signal values and become while being less than fiducial value from being greater than fiducial value, make the saltus step of virtual voltage difference to predeterminated voltage and initial voltage, this voltage jump method is less than saltus step of the prior art voltage linear changing method of the prior art power consumption, therefore 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.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
A kind of circuit driving device structure schematic diagram that Fig. 1 provides for the embodiment of the present invention;
The another kind of circuit driving device structure schematic diagram that Fig. 2 provides for the embodiment of the present invention;
Another circuit driving device structure schematic diagram that Fig. 3 provides for the embodiment of the present invention;
The fiducial value setting unit structural representation that Fig. 4 provides for the embodiment of the present invention;
The slope control unit structural representation that Fig. 5 provides for the embodiment of the present invention;
Another circuit driving device structure schematic diagram that Fig. 6 provides for the embodiment of the present invention;
A kind of circuit driving method flow chart that Fig. 7 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the present invention provides a kind of circuit drive unit 10, as shown in Figure 1, comprises class AB line driver 101, also comprises:
Comparing unit 102, for input signal values and fiducial value are compared, output comparison signal; Input signal comprises: input difference positive signal, input difference negative signal or absolute value signal; Described comparison signal is indicated the relation of described input signal values and described fiducial value; Described absolute value signal is larger signal in described input difference positive signal and input difference negative signal.
Described comparison signal can be waveform signal, can be also digital signal, and the present invention does not limit at this.
Charge pump circuit 103, for according to comparison signal, becomes and is greater than fiducial value from being less than fiducial value at input signal values, and current virtual voltage is while being initial voltage, makes initial voltage saltus step to predeterminated voltage; Described virtual voltage is the difference of positive supply virtual voltage and the negative supply virtual voltage of described class AB line driver; Described initial voltage is the externally operating voltage under Power supply state of described class AB circuit drive unit; Described predeterminated voltage is greater than described initial voltage.
Charge pump circuit 103 is also for according to signal comparative result, become and be less than fiducial value, and current virtual voltage is while being predeterminated voltage, makes predeterminated voltage saltus step to initial voltage at input signal values from being greater than fiducial value; Said reference value has one at least.
So, charge pump circuit is according to the comparison signal of comparing unit output and current voltage condition, at input signal values, from being less than fiducial value, becoming and be greater than fiducial value and input signal values and become while being less than fiducial value from being greater than fiducial value, make the saltus step of virtual voltage difference to predeterminated voltage and initial voltage, this voltage jump method is less than voltage linear changing method power consumption of the prior art, therefore 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.
Especially, on the one hand, comparing unit 102 can by the input difference positive signal in circuit drive unit 10 place xDSL systems and input difference negative signal be direct and fiducial value compares, and output comparative result is signal as a comparison.
On the other hand, can also be at signal through before comparing unit 102, first input difference positive signal and input difference negative signal are compared, output comparison signal, now, this circuit drive unit 10 also comprises: absolute value circuit 104, for comparing the size of input difference positive signal and input difference negative signal, obtain absolute value signal, as shown in Figure 2.Adopt comparing unit to coordinate 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.
It should be noted that, said reference value can be fixed value, in comparing unit, pre-sets; Also can be also dynamic value, 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, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses, and the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.
When fiducial value is dynamic value, as shown in Figure 3, this circuit drive unit 10 also comprises: fiducial value setting unit 105, and for fiducial value is set.
It should be noted that, in concrete xDSL system, said reference value can have one, also can have a plurality ofly, exemplary, and as shown in Figure 4, when circuit drive unit has two fiducial values, fiducial value setting unit 105 can comprise:
The first pressure filter circuit 1051, the first pressure filter circuits 1051 comprise:
Resistance R 1 and the R2 of series connection, R1=R2, one end ground connection of R2, R1 is connected with the first pressure filter circuit input; The input of the first pressure filter circuit connects external power source; Capacitor C 1, capacitor C 1 is in parallel with R2, for the power supply noise of filtering the first pressure filter circuit; The first follower M1, the first input of follower M1 and the other end of R2 are connected, for increasing the driving force of the first pressure filter circuit 1051 outputs; The output of the first follower M1 is positioned at the first pressure filter circuit output.
The second pressure filter circuit 1052, the second pressure filter circuits 1052 comprise:
The first Voltage stabilizing module, described the first Voltage stabilizing module connects external power source VS+; Resistance R 3 and the R4 of series connection, R4/ (R3+R4)=1/TxGain; TxGain is the transmission gain of class AB line driver; One end of R4 is connected with the output of the first pressure filter circuit; The input of the second pressure filter circuit connects the first Voltage stabilizing module N1; Capacitor C 2, capacitor C 2 is in parallel with R4, for the power supply noise of filtering the second pressure filter circuit; The second follower M2, the second input of follower M2 and the other end of R4 are connected, for increasing the driving force of the second pressure filter circuit 1052 outputs; The output of the second follower M2 is positioned at the second pressure filter circuit 1052 outputs.Especially, the first Voltage stabilizing module N1 can reach the unit of voltage stabilizing object for voltage stabilizing didoe, voltage stabilizing circuit etc.
The second pressure filter circuit 1052 meets formula:
Vup=((VS+)-(Vheadroom+ Δ offset1)-(VS+)/2) * (R4/ (R3+R4))+(VS+)/2; Vup is first reference value; Δ offset1 is for the first default reference value, for adjusting first reference value.According to above-mentioned formula, can find out, 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, described the second Voltage stabilizing module connects external power source VS+; Resistance R 5 and the R6 of series connection, R6/ (R5+R6)=1/TxGain; TxGain is the transmission gain of class AB line driver; One end of R6 is connected with the output of the 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 in parallel with R6, for the power supply noise of filtering the 3rd pressure filter circuit; The 3rd follower M3, the 3rd input of follower M3 and the other end of R6 are connected, for increasing 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.Especially, the second Voltage stabilizing module N2 can reach the unit of voltage stabilizing object for voltage stabilizing didoe, voltage stabilizing circuit etc.
The 3rd pressure filter circuit 1053 meets formula:
Vdown=((VS+)-(Vheadroom-Δ offset2)-(VS+)/2) * (R6/ (R5+R6))+(VS+)/2; Vdown is the second fiducial value; Δ offset2 is for the second default reference value, for adjusting the second fiducial value.According to above-mentioned formula, can find out, the second fiducial value changes with the variation of outer power voltage.
Above-mentioned the first pressure filter circuit 1051, the second pressure filter circuit 1052 are connected with the 3rd pressure filter circuit 1053.The first Voltage stabilizing module N1 is connected respectively external power source VS+ 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; Vheadroom is the maximum signal level that can export of class AB line driver and the difference between outer power voltage VS+.
It should be noted that; above fiducial value setting unit; it is only the specific embodiment of the present invention; but protection scope of the present invention is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.
Further, in order to reduce the impact of supply voltage saltus step on class AB line driver performance, this circuit drive unit 10 can also comprise: slope control unit 106, for when virtual voltage carries out saltus step, adjust the slope at virtual voltage saltus step edge, the virtual voltage bound-time of charge pump circuit is extended, and by certain slope variation.
Especially, above-mentioned initial voltage is externally the positive supply initial voltage under 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 positive supply predeterminated voltage and the negative supply predeterminated voltage of class AB circuit drive unit, and as shown in Figure 5, this slope control unit 106 comprises:
First control circuit 1061, for in the saltus step of described positive supply initial voltage during to described positive supply predeterminated voltage or the saltus step of described positive supply predeterminated voltage to described positive supply initial voltage, adjust the slope at described positive voltage saltus step edge, described positive voltage bound-time is extended.This first control circuit 1061 comprises: the first current mirror S1, and the first current mirror positive electrode is connected with external power source; The first capacitor C 4, the first electric capacity positive electrodes are connected with charge pump circuit; The second current mirror S2, the second current mirror negative electrode ground connection, positive electrode is connected with the first current mirror negative electrode, the second current mirror and the first Capacitance parallel connection.
Second control circuit 1062, for in the saltus step of described negative supply initial voltage during to described negative supply predeterminated voltage or the saltus step of described negative supply predeterminated voltage to described negative supply initial voltage, adjust the slope at described negative supply voltage saltus step edge, described negative supply voltage bound-time is extended.Second control circuit 1062 comprises: the 3rd current mirror S3, the 3rd current mirror negative electrode ground connection; The second capacitor C 5, the second capacitor C 5 negative electrodes are connected with charge pump circuit; The 4th current mirror S4, the 4th current mirror positive electrode is connected with external power source, and negative electrode is connected with the 3rd current mirror positive electrode, the 4th current mirror and the second Capacitance parallel connection.
Logic control subelement 1063, is connected with second control circuit 1062 with first control circuit 1061, for controlling the adjustment of first and second control circuit to the virtual voltage of class AB line driver.Logic control subelement 1063, is connected with first, second, third and fourth current mirror.
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 close, the first current mirror S1 is the first capacitor C 4 chargings, and the 3rd current mirror S3 is the second capacitor C 5 chargings.According to formula:
i is electric current, and t is the time, and C is electric capacity, and U is voltage.
Can find out, voltage U is directly proportional to time t, so x end electromotive force all increases in time and increase, and y end electromotive force all increases in time and reduces, thereby U value is increased in time and increases.
When the second current mirror S2 and the 4th current mirror S4 open, the first current mirror S1, the 3rd time increases and reduces, meanwhile, the second capacitor C 5 electric discharges, lower end current reflux to the four current mirror S4, y end electromotive force increases in time and increases.
Therefore, when input signal values becomes and is greater than fiducial value from being less than fiducial value, and when current virtual voltage is initial voltage, logic control subelement can make first and third current mirror open, second, four current mirrors are closed, so that adjust initial voltage to the slope at predeterminated voltage saltus step edge, make initial voltage to the time lengthening of predeterminated voltage saltus step.
When input signal values becomes and is less than fiducial value from being greater than fiducial value, and when current virtual voltage is predeterminated voltage, logic control subelement can make second, four current mirrors open, first and third current mirror is closed, so that adjust the slope from predeterminated voltage to initial voltage saltus step edge, predeterminated voltage is extended to initial voltage bound-time.
When input signal values becomes while being less than first reference value from being greater than first reference value, logic control subelement can make second, four current mirrors open, first and third current mirror is closed, so that adjust the slope of virtual voltage from predeterminated voltage to initial voltage saltus step edge, virtual voltage is extended from predeterminated voltage to initial voltage bound-time.
Example, when circuit drive unit has two fiducial values, circuit drive unit 10 connected modes that the embodiment of the present invention provides can be as shown in Figure 6.This circuit drive unit 10 comprises class AB line driver 101, comparing unit 102, charge pump circuit 103, absolute value circuit 104, fiducial value setting 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, suppose that input difference positive signal INP and input difference negative signal INN waveform are as shown in waveform a in Fig. 6, absolute value circuit 104 compares after the size of input difference positive signal and input difference negative signal, the absolute value signal of output is as shown in waveform b in Fig. 6, comparing unit 102 and absolute value circuit 104, fiducial value setting unit 105 connects, these fiducial value setting unit 105 structures as shown in Figure 4, comparing unit 102 compares the fiducial value of above-mentioned absolute value signal value and 105 outputs of fiducial value setting unit, output comparison signal, the comparison signal of output is as shown in waveform c in Fig. 6, waveform c and square wave are similar, for reducing its impact of saltus step edge on charge pump circuit performance, comparing unit 102 outputs are connected with slope control unit 106 inputs, these slope control unit 106 structures as shown in Figure 5, its output is connected with charge pump circuit 103, charge pump circuit 103 is according to comparison signal, at input signal values, from being less than fiducial value, becoming and be greater than fiducial value, and when current virtual voltage is initial voltage, make initial voltage saltus step to predeterminated voltage, simultaneously, at input signal values, from being greater than fiducial value, becoming and be less than fiducial value, and when current virtual voltage is predeterminated voltage, make predeterminated voltage saltus step to initial voltage.Due to the effect of slope control unit 106, when virtual voltage carries out saltus step, increased the slope at virtual voltage saltus step edge, the virtual voltage bound-time of charge pump circuit 103 is extended.
Especially; in Fig. 6, charge pump circuit 103 is basic identical with prior art; here repeat no more; the charge pump circuit 103 that the embodiment of the present invention provides just illustrates; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Charge pump circuit 103 signal output waveforms are as shown in waveform d in Fig. 6, and the signal saltus step edge slope of waveform d is larger, has reduced the impact on 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 in above-mentioned Fig. 6, at described input signal values, from being less than fiducial value, becoming and be greater than described fiducial value, and when current virtual voltage is initial voltage, charge pump circuit is by the power supply VCC of class AB line driver and VEE difference pump is high and pump is low, makes described initial voltage saltus step to predeterminated voltage.
At described input signal values, from being greater than described fiducial value, becoming and be less than described fiducial value, and when current virtual voltage is described predeterminated voltage, charge pump circuit, by power supply VCC and the VEE of class AB line driver, recovers normal condition, even if described predeterminated voltage saltus step is to described initial voltage; Now this class AB line driver is operated in external power source pattern, and now the operating voltage of line driver is that initial voltage is VCC-VEE=(VS+)-2Vdiode, and Vdiode is the diode drop in charge pump circuit 103 in Fig. 6.
Especially, in actual applications, because charge pump saltus step has certain time delay, said reference value setting unit can according to circumstances suitably reduce first reference value, second fiducial value that raises, like this, the corresponding action of charge pump shifts to an earlier date, thereby reduces the time delay of charge pump saltus step.
The circuit drive unit that the embodiment of the present invention provides, charge pump circuit is according to the comparison signal of comparing unit output and current voltage condition, at input signal values, from being less than fiducial value, becoming and be greater than fiducial value and input signal values and become while being less than fiducial value from being greater than fiducial value, make the saltus step of virtual voltage difference to predeterminated voltage and initial voltage, this voltage jump method is less than voltage linear changing method power consumption of the prior art, therefore 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.Meanwhile, this apparatus structure is simple, applying flexible, and noise is lower.
A kind of circuit driving method that the embodiment of the present invention provides, as shown in Figure 7, comprising:
S701, input signal values and fiducial value are compared to output comparison signal; Input signal comprises: input difference positive signal, input difference negative signal or absolute value signal; Described comparison signal is indicated the relation of described input signal values and described fiducial value.
S702, according to comparison signal, at input signal values, from being less than fiducial value, becoming and be greater than fiducial value, and current virtual voltage is while being initial voltage, makes initial voltage saltus step to predeterminated voltage.Described virtual voltage is the difference of positive supply virtual voltage and the negative supply virtual voltage of described class AB line driver; Described initial voltage is the externally operating voltage under Power supply state of described class AB circuit drive unit; Described predeterminated voltage is greater than described initial voltage.
S703, according to signal comparative result, at input signal values, from being greater than fiducial value, becoming and be less than fiducial value, and current virtual voltage is while being predeterminated voltage, makes predeterminated voltage saltus step to initial voltage; Fiducial value has one at least.
So, charge pump circuit is according to the comparison signal of comparing unit output and current voltage condition, at input signal values, from being less than fiducial value, becoming and be greater than fiducial value and input signal values and become while being less than fiducial value from being greater than fiducial value, make the saltus step of virtual voltage difference to predeterminated voltage and initial voltage, this voltage jump method is less than voltage linear changing method power consumption of the prior art, simultaneously, the power consumption that input signal values and fiducial value is compared to process is also less, therefore, adopt this circuit driving method can reduce the overall power of circuit drive unit.
Especially, 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 described 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 extended.In the time of can reducing virtual voltage saltus step like this, the impact on class AB line driver performance.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can complete by the relevant hardware of program command, aforesaid program can be stored in a computer read/write memory medium, this program, when carrying out, is carried out the step that comprises said method embodiment; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CDs.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.

Claims (13)

1. a circuit drive unit, comprises class AB line driver, it is characterized in that, comprising:
Comparing unit, for input signal values and fiducial value are compared, output comparison signal; Described input signal comprises: input difference positive signal, input difference negative signal or absolute value signal; Described comparison signal is indicated the relation of described input signal values and described fiducial value; Described absolute value signal is larger signal in described input difference positive signal and input difference negative signal;
Charge pump circuit, for according to described comparison signal, becomes and is greater than described fiducial value from being less than fiducial value at described input signal values, and current virtual voltage is while being initial voltage, makes described initial voltage saltus step to predeterminated voltage; Described virtual voltage is the difference of positive supply virtual voltage and the negative supply virtual voltage of described class AB line driver; Described initial voltage is the externally operating voltage under Power supply state of described class AB circuit drive unit; Described predeterminated voltage is greater than described initial voltage;
Described charge pump circuit is also for according to signal comparative result, become and be less than described fiducial value, and current virtual voltage is while being described predeterminated voltage, makes described predeterminated voltage saltus step to described initial voltage at described input signal values from being greater than described fiducial value;
Described fiducial value has one at least.
2. device according to claim 1, is characterized in that, also comprises:
Absolute value circuit, for comparing the size of input difference positive signal and input difference negative signal, obtains described absolute value signal.
3. device according to claim 1, is characterized in that, also comprises:
Fiducial value setting unit, for arranging described fiducial value.
4. device according to claim 3, is characterized in that, when described circuit drive unit has two fiducial values, described fiducial value setting unit comprises:
The first pressure filter circuit, described the first pressure filter circuit comprises:
Resistance R 1 and the R2 of series connection, R1=R2, one end ground connection of described R2, described R1 is connected with described the first pressure filter circuit input; The input of described the first pressure filter circuit connects external power source;
Capacitor C 1, described capacitor C 1 is in parallel with described R2, for the power supply noise of the first pressure filter circuit described in filtering;
The first follower, the input of described the first follower is connected with the other end of described R2, for increasing the driving force of described pressure filter circuit output; The output of described follower is positioned at described the first pressure filter circuit output;
The second pressure filter circuit, described the second pressure filter circuit comprises:
The first Voltage stabilizing module, described the first Voltage stabilizing module connects described external power source;
Resistance R 3 and the R4 of series connection, R4/ (R3+R4)=1/TxGain; Described TxGain is the transmission gain of class AB line driver; One end of described R4 is connected with the output of described the first pressure filter circuit; The input of described the second pressure filter circuit connects described the first Voltage stabilizing module;
Capacitor C 2, described capacitor C 2 is in parallel with described R4, for the power supply noise of the second pressure filter circuit described in filtering;
Described the second pressure filter circuit is connected with described the first pressure filter circuit.
5. device according to claim 4, is characterized in that, described fiducial value setting unit also comprises:
The 3rd pressure filter circuit, described the 3rd pressure filter circuit comprises:
The second Voltage stabilizing module, described the second Voltage stabilizing module connects described external power source;
Resistance R 5 and the R6 of series connection, R6/ (R5+R6)=1/TxGain; Described TxGain is the transmission gain of class AB line driver; One end of described R6 is connected with the output of described the second pressure filter circuit; The input of described the 3rd pressure filter circuit connects described the second Voltage stabilizing module;
Capacitor C 3, described capacitor C 3 is in parallel with described R6, for the power supply noise of the 3rd pressure filter circuit described in filtering;
Described the 3rd pressure filter circuit is connected with described the second pressure filter circuit, described the first pressure filter circuit.
6. device according to claim 5, is characterized in that,
Described the second pressure filter circuit also comprises:
The second follower, the input of described the second follower is connected with the other end of described R4, for increasing the driving force of described the first pressure filter circuit output; The output of described the second follower is positioned at described the second pressure filter circuit output;
Described the 3rd pressure filter circuit also comprises:
The 3rd follower, described the 3rd input of follower and the other end of described R6 are connected, for increasing the driving force of described the 3rd pressure filter circuit output; The output of described follower is positioned at described the 3rd pressure filter circuit output.
7. according to the device described in claim 1 to 6 any one claim, it is characterized in that, also comprise:
Slope control unit, for when described virtual voltage carries out saltus step, adjusts the slope at described virtual voltage saltus step edge, and described virtual voltage bound-time is extended.
8. device according to claim 7, is characterized in that, described initial voltage is externally the positive supply initial voltage under Power supply state and the difference of negative supply initial voltage of described class AB circuit drive unit; Described predeterminated voltage is the difference of positive supply predeterminated voltage and the negative supply predeterminated voltage of described class AB circuit drive unit,
Described slope control unit comprises:
First control circuit, for in the saltus step of described positive supply initial voltage during to described positive supply predeterminated voltage or the saltus step of described positive supply predeterminated voltage to described positive supply initial voltage, adjust the slope at described positive voltage saltus step edge, described positive voltage bound-time is extended;
Second control circuit, for in the saltus step of described negative supply initial voltage during to described negative supply predeterminated voltage or the saltus step of described negative supply predeterminated voltage to described negative supply initial voltage, adjust the slope at described negative supply voltage saltus step edge, described negative supply voltage bound-time is extended;
Logic control subelement, is connected with described first and second control circuit, for controlling the adjustment of described first and second control circuit to the virtual voltage of described class AB line driver.
9. device according to claim 8, is characterized in that,
Described first control circuit comprises:
The first current mirror, described the first current mirror positive electrode is connected with described external power source;
The first electric capacity, described the first electric capacity positive electrode is connected with described charge pump circuit;
The second current mirror, described the second current mirror negative electrode ground connection, positive electrode is connected with described the first current mirror negative electrode, described the second current mirror and described the first Capacitance parallel connection;
Described second control circuit comprises:
The 3rd current mirror, described the 3rd current mirror negative electrode ground connection;
The second electric capacity, described the second electric capacity negative electrode is connected with described charge pump circuit; Described first, second electric capacity is for filtering external power source noise;
The 4th current mirror, described the 4th current mirror positive electrode is connected with described external power source, and negative electrode is connected with described the 3rd current mirror positive electrode, described the 4th current mirror and described the second Capacitance parallel connection;
Wherein said first, second, third and fourth current mirror is connected with described logic control subelement.
10. a circuit driving method, is characterized in that, comprising:
Input signal values and fiducial value are compared to output comparison signal; Described input signal comprises: input difference positive signal, input difference negative signal or absolute value signal; Described comparison signal is indicated the relation of described input signal values and described fiducial value;
According to described comparison signal, at described input signal values, from being less than fiducial value, becoming and be greater than described fiducial value, and current virtual voltage is while being initial voltage, makes described initial voltage saltus step to predeterminated voltage; Described virtual voltage is the difference of positive supply virtual voltage and the negative supply virtual voltage of class AB line driver; Described initial voltage is the externally operating voltage under Power supply state of described class AB circuit drive unit; Described predeterminated voltage is greater than described initial voltage;
According to signal comparative result, at described input signal values, from being greater than described fiducial value, becoming and be less than described fiducial value, and current virtual voltage is while being described predeterminated voltage, makes described predeterminated voltage saltus step to described initial voltage;
Described fiducial value has one at least.
11. methods according to claim 10, is characterized in that, described, input signal values and fiducial value are compared, and before output comparison signal, described method also comprises:
Relatively the size of input difference positive signal and input difference negative signal, obtains described absolute value signal.
12. according to the method described in claim 10 or 11, it is characterized in that, described method also comprises:
Described fiducial value is set.
13. according to the method described in claim 10 or 11, it is characterized in that, described method also comprises:
When described virtual voltage carries out saltus step, adjust the slope at described virtual voltage saltus step edge, described virtual voltage bound-time is extended.
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