CN101552552B - Dynamic feedback stabilized charge pump device - Google Patents
Dynamic feedback stabilized charge pump device Download PDFInfo
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- CN101552552B CN101552552B CN2008100911112A CN200810091111A CN101552552B CN 101552552 B CN101552552 B CN 101552552B CN 2008100911112 A CN2008100911112 A CN 2008100911112A CN 200810091111 A CN200810091111 A CN 200810091111A CN 101552552 B CN101552552 B CN 101552552B
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Abstract
The invention relates to a dynamic feedback stabilized charge pump device, which receives input voltage through a voltage regulator, the voltage regulator regulates the input voltage into fundamental voltage according to control signals and outputs the fundamental voltage. A charge pump receives the fundamental voltage and uses the fundamental voltage as output voltage after the fundamental voltage is doubled. A feedback unit provides the control signal for the voltage regulator according to the output voltage. Therefore, the dynamic feedback stabilized charge pump device can lower the output voltage ripples and improves the output efficiency of the charge pump.
Description
Technical field
The invention relates to a kind of charge pump device, and particularly relevant for the charge pump device of the dynamic feedback stabilized ability of a kind of tool.
Background technology
In electronic circuit, often need the supply voltage of various varying levels to use for circuit, therefore normal configuration charge pump (charge pump) circuit is so that utilize existing supply voltage to produce the supply voltage of various varying levels.Charge pump circuit is with a certain preset multiplying power its input voltage level to be increased (or downgrading), to produce the voltage of varying level.Therefore, the output-voltage levels of charge pump circuit is just closely bound up with its input voltage.Yet; For charge pump circuit goes for various environment (that is when designing charge pump circuit, possibly can't confirm its input voltage); And still can produce the output voltage of identical expection; Generally be to utilize voltage-regulating circuit earlier output-voltage levels to be adjusted to rated voltage, just produce rated output voltage then by charge pump.
Fig. 1 is known charge pump circuit figure.Capacitor C, switch 102, switch 103, switch 104 and switch 105 constitute a charge pump.Transistor T 1, operational amplifier 101, resistance R 1, resistance R 2 constitute one and have degenerative voltage-regulating circuit.This voltage-regulating circuit meets receiving system voltage V
CC, and with system voltage V
CCBe adjusted into input voltage V
In1Charge pump is when first work period, and switch 102 and 105 can present short circuit, and switch 103 and 104 can present open circuit, at this moment input voltage V
In1Can charge to capacitor C, make capacitor C have the input voltage of being equal to V
In1Current potential.Charge pump is when second work period, and switch 103 and 104 can present short circuit, and switch 102 and 105 can present open circuit, make capacitor C wherein an end be connected to input voltage V from ground connection changing into
In1(that is change into V from 0V
In1), this moment, the other end current potential of capacitor C can be from V
In1Be raised to 2V
In1Therefore, output voltage V
Out1Can obtain doubling input voltage V
In1Voltage.
Though can providing, the known charge pumping doubles input voltage V
In1Voltage, but when the electric current that occurs producing because of load variations when the charge pump output changed, voltage-regulating circuit can't detect in real time and be directed against the variation of output current and adjust its input voltage V
In1, so that output voltage V
Out1Can change with load current and produce more violent ripple.Like the problem of desire solution ripple, generally be with the direct coupling system voltage of charge pump input, couple voltage adjuster in output again with electric capacity of voltage regulation.But this settling mode can cause voltage adjuster directly in the face of the problem of load, and the electric capacity of voltage regulation that is increased also can increase the burden of cost, and the related script function that makes charge pump can't be brought into play fully.
Summary of the invention
The present invention provides a kind of dynamic feedback stabilized charge pump device; It utilizes the output voltage of feedback unit detection of dynamic and feedback charge pump; Do not increasing under additional element and the condition of cost, reducing the effect of output voltage ripple and lifting charge pump delivery efficiency.
The present invention provides a kind of charge pump device, and it comprises voltage adjuster, charge pump and feedback unit.The input of voltage adjuster receives input voltage, and according to control signal the input voltage adjustment is output as fundamental voltage.The output that charge pump couples voltage adjuster to be to receive fundamental voltage, then with after the fundamental voltage multiplication of voltage as output voltage.The input of feedback unit is coupled to the output of charge pump to receive output voltage, and the output of feedback unit is coupled to voltage adjuster so that control signal to be provided, and wherein control signal is relevant with output voltage.
Above-mentioned voltage adjuster comprises operational amplifier, transistor and switch.First end of operational amplifier is coupled to the output of feedback unit to receive control signal, and second termination of operational amplifier is received reference voltage.Transistorized grid is coupled to the output of operational amplifier, and its first source-drain electrode receives input voltage, its second source-drain electrode output fundamental voltage.First termination of switch is received this input voltage, and second end of switch is coupled to the output of this operational amplifier.
In one embodiment of this invention; Above-mentioned feedback unit comprises first resistance and second resistance; To receive output voltage, second end of first resistance controls signal to voltage adjuster as the output of feedback unit to provide to first end of first resistance as the input of feedback unit.First end of second resistance is coupled to second end of first resistance, the second end ground connection of second resistance.
The present invention provides a kind of dynamic feedback stabilized charge pump device; It combines effect and the stabilized voltage characteristic of voltage adjuster and the ability that feedback unit detects and feeds back in real time of charge pump multiplication of voltage; Detection of dynamic and feedback output voltage; The electric current that causes with its load of real time reaction changes, and can under the condition that does not increase additional element and cost, promote the ripple of charge pump delivery efficiency and reduction output voltage.
For letting the above-mentioned feature and advantage of the present invention can be more obviously understandable, hereinafter is special lifts preferred embodiment, and cooperates appended graphicly, elaborates as follows.
Description of drawings
Fig. 1 is known charge pump circuit figure.
Fig. 2 is dynamic feedback stabilized charge pump device sketch map according to an embodiment of the invention.
Fig. 3 A is the dynamic feedback stabilized charge pump device circuit diagram of first execution mode according to an embodiment of the invention.
Fig. 3 B is according to one embodiment of the invention, the phase waveform figure of key diagram 3A.
Fig. 4 is the dynamic feedback stabilized charge pump device circuit diagram of second execution mode according to an embodiment of the invention.
Fig. 5 is the dynamic feedback stabilized charge pump device circuit diagram of the 3rd execution mode according to an embodiment of the invention.
Fig. 6 is the dynamic feedback stabilized charge pump device circuit diagram of the 4th execution mode according to an embodiment of the invention.
Fig. 7 is the dynamic feedback stabilized charge pump device circuit diagram of the 5th execution mode according to an embodiment of the invention.
Fig. 8 is the dynamic feedback stabilized charge pump device circuit diagram of the 6th execution mode according to an embodiment of the invention.
[main element label declaration]
200,300,400,500,600,700,800: dynamic feedback stabilized charge pump device
201: voltage adjuster
202: charge pump
203: feedback unit
101, OP1: operational amplifier
T1, Tr1: transistor
V
CL, PH1, PH2: control signal
V
In1: input voltage
V
BASE: fundamental voltage
V
CC, V
DD: system voltage
V
OUT1, V
OUT2: output voltage
V
REF1, V
REF2: reference voltage
102,103,104,105, SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW9, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17, SW18, SW19: switch
R1, R2, R3, R4: resistance
C, C1, C2, C3, C4, C5, C
OUT2: electric capacity
Embodiment
Because of known charge pump can't the real time reaction output variation.When the electric current that occurs producing because of load variations when output changed, the output voltage that known charge pump produces can change with electric current have more violent ripple problem.In view of this, the ability that the following embodiment of the present invention utilizes feedback unit to detect and feed back in real time is to reach the ripple effect that promotes the charge pump delivery efficiency and reduce output voltage.
Fig. 2 is dynamic feedback stabilized charge pump device 200 sketch mapes according to an embodiment of the invention.Please with reference to Fig. 2, dynamic feedback stabilized charge pump device 200 comprises voltage adjuster (voltageregulator) 201, charge pump (charge pump) 202 and feedback unit (feedback unit) 203.Voltage adjuster 201 couples charge pump 202 and feedback unit 203.Charge pump 202 couples feedback unit 203.The input of voltage adjuster 201 receives input voltage, and (present embodiment is with system voltage V
DDBe example), and according to control signal V
CLWith system voltage V
DDAdjustment is output as fundamental voltage V
BASEThe input of charge pump 202 receives fundamental voltage V
BASE, then with fundamental voltage V
BASEAfter the multiplication of voltage as output voltage V
OUT2The input of feedback unit 203 receives output voltage V
OUT2, and feedback unit 203 is according to output voltage V
OUT2Control signal V is provided
CLGive voltage adjuster 201.By this, but present embodiment detection of dynamic of the present invention and the feedback output voltage V
OUT2, to reach the purpose that its load current of fast reaction changes, the ripple of related lifting charge pump delivery efficiency and reduction output voltage.
The various execution modes of an above-mentioned embodiment can be explained with each following embodiment.Fig. 3 A is dynamic feedback stabilized charge pump device 300 circuit diagrams of first execution mode according to an embodiment of the invention.Voltage adjuster 201 comprises operational amplifier OP1 and transistor Tr 1.First end of operational amplifier (operationamplifier) OP1 (present embodiment is example with the non-inverting input) couples the output (that is second end of resistance R 3) of feedback unit, and its second end (present embodiment is example with the inverting input) receives reference voltage V
REF2, its output couples the grid of transistor Tr 1.First source-drain electrode of transistor Tr 1 (present embodiment is example with the source electrode) receiving system voltage V
DD, its second source-drain electrode (present embodiment is example with the drain electrode) for the output of voltage adjuster 201 and first end that couples switch SW 2 and SW3 with output fundamental voltage V
BASEIn this execution mode, the P-type mos transistor is a kind of mode that transistor Tr 1 realizes, and is non-with restriction the present invention.
Fig. 3 B is according to one embodiment of the invention, the phase waveform figure of key diagram 3A.Please be simultaneously with reference to Fig. 3 A and Fig. 3 B, control signal PH1 and PH2 among PH1 among Fig. 3 B and the PH2 difference map 3A, the high potential representation switch short circuit in the waveform, the electronegative potential representation switch open circuit in the waveform.As transistor Tr 1 receiving system voltage V
DDThe time, can be according to the control of operational amplifier OP1 with system voltage V
DDBe adjusted into fundamental voltage V
BASEAfter be sent to first end of switch SW 2 and SW3.When control signal PH1 is high potential (this moment, control signal PH2 was an electronegative potential), switch SW 2 and SW5 can present short circuit, and switch SW 3 and SW4 can present open circuit.Therefore, fundamental voltage V
BASECan charge the rough fundamental voltage V that equals of current potential that lets capacitor C 1 store to capacitor C 1
BASECurrent potential.
When control signal PH2 is high potential (this moment, control signal PH1 was an electronegative potential), switch SW 3 and SW4 can present short circuit, and switch SW 2 and SW5 can present open circuit, make second end of capacitor C 1 be connected to fundamental voltage V from ground connection changing into
BASE(that is change into V from 0V
BASE), this moment, first terminal potential of capacitor C 1 can be from rough fundamental voltage V
BASECurrent potential is raised to rough 2V
BASESo output voltage V
OUT2About slightly fundamental voltage V of twice
BASEOutput capacitance C
OUT2Let output voltage V
OUT2More stable.
Resistance R 3 and R4 are series between the output and ground connection of charge pump 202, with output voltage V
OUT2Dividing potential drop is as control signal V
CLControl signal V
CLWill be transmitted to first end of operational amplifier OP1.When the curtage of charge pump 202 outputs because of load (not illustrating) when changing, resistance R 3 and R4 can pass through control signal V
CLReflect its variation.Because control signal V
CLChange along with charge pump 202 outputs; Therefore operational amplifier OP1 can respond the variation of charge pump 202 outputs and dynamic oxide-semiconductor control transistors Tr1 makes transistor Tr 1 adjust its fundamental voltage V in response to the variation of charge pump 202 outputs fast
BASEBy this, present embodiment can be exported the rough fundamental voltage V that doubles
BASEOutput voltage V
OUT2, and reach the electric current variation of dynamical feedback output and the function of carrying out voltage stabilizing, related minimizing output voltage V
OUT2Ripple.
Fig. 4 is dynamic feedback stabilized charge pump device 400 circuit diagrams of second execution mode according to an embodiment of the invention.Comparison diagram 3A and Fig. 4, its identical function gives identical label, can find that its difference is switch SW 1, switch SW 2 and the capacitor C 1 in the dynamic feedback stabilized charge pump device 400.First termination of switch SW 1 is received system voltage V
DD, its second end couples the output of operational amplifier OP1.First termination of switch SW 2 is received system voltage V
DDSecond end of capacitor C 1 then couples the drain electrode of transistor Tr 1.Compare with Fig. 3 A, present embodiment saves the switch SW 3 that can tolerate big electric current, and disposes the switch SW 1 of a small size.
With reference to Fig. 3 B key diagram 4, control signal PH2B is the anti-phase of control signal PH2 equally.When control signal PH1 is high potential (this moment, control signal PH2 was an electronegative potential, and control signal PH2B is a high potential), switch SW 1, SW2 and SW5 can present short circuit, and switch SW 4 can present open circuit.The short circuit of switch SW 1 makes transistor Tr 1 present not conducting (ending).During this period, system voltage V
DDCan charge via 2 pairs of capacitor C 1 of switch SW, let capacitor C 1 store the rough system voltage V that equals
DDCurrent potential.Because of system voltage V
DDCan be directly to the relation of capacitor C 1 charging, its charging rate can be faster.When control signal PH2 is high potential (control signal PH2B, PH1 are electronegative potential at this moment), switch SW 4 can present short circuit, and switch SW 1, SW2 and SW5 can present open circuit.Transistor Tr 1 receives the control of operational amplifier OP1 and exports fundamental voltage V
BASEGive second end of capacitor C 1.Because second end of capacitor C 1 changes fundamental voltage V into from ground connection (that is 0V)
BASE, cause first terminal potential of capacitor C 1 can be from V
DDBe raised to V
DD+ V
BASEAbove-mentioned V
DD+ V
BASECan be exported as output voltage V via switch SW 4
OUT2
Resistance R 3 and R4 are series between the output and ground connection of charge pump 202, with output voltage V
OUT2Dividing potential drop is as control signal V
CLControl signal V
CLWill be transmitted to first end of operational amplifier OP1.When the curtage of charge pump 202 outputs because of load (not illustrating) when changing, feedback unit 203 can be through control signal V
CLReflect its variation.Because control signal V
CLChange along with charge pump 202 outputs; Therefore operational amplifier OP1 can respond variation and the dynamic oxide-semiconductor control transistors Tr1 of charge pump 202 outputs, makes the variation that transistor Tr 1 can fast reaction charge pump 202 outputs and adjusts its fundamental voltage V
BASE, and then the output voltage V of adjustment charge pump 202
OUT2By this, present embodiment can reach the variation of dynamical feedback output and pass on its function that is reacted to output and then voltage stabilizing, related minimizing output voltage V more quickly
OUT2Ripple and promote delivery efficiency.
Fig. 5 is dynamic feedback stabilized charge pump device 500 circuit diagrams of the 3rd execution mode according to an embodiment of the invention.Voltage adjuster 201 and feedback unit 203 are of above-mentioned Fig. 3 A embodiment, so repeat no more.Charge pump 202 comprises that second capacitor C 2, the 3rd capacitor C 3, the 6th switch SW 6, minion close that SW7, octavo close SW8, the 9th switch SW 9, the tenth switch SW the 10, the 11 switch SW 11, twelvemo is closed SW12 and output capacitance C
OUT2First end of switch SW 6 couples the drain electrode of transistor Tr 1 to receive fundamental voltage V
BASE, first end of its second end coupling capacitance C2.First end of switch SW 7 couples first end of switch SW 6, second end of its second end coupling capacitance C2.First end of switch SW 8 couples first end of coupling capacitance C2, first end of its second end coupling capacitance C3.Second end of the first end coupling capacitance C2 of switch SW 9, its second termination is received earthed voltage.First end of switch SW 10 couples first end of switch SW 6, second end of its second end coupling capacitance C3.First end of the first end coupling capacitance C3 of switch SW 11, its second termination is received earthed voltage.Second end of the first end coupling capacitance C3 of switch SW 12, the output that its second end is a charge pump 202 is to provide output voltage V
OUT2Output capacitance C
OUT2First end couple second end of switch SW 12, its second end couples earthed voltage.Those skilled in the art can look demand and omit output capacitance C
OUT2
Equally with reference to Fig. 3 B key diagram 5.As transistor Tr 1 receiving system voltage V
DDThe time, can be according to the control of operational amplifier OP1 with system voltage V
DDBe adjusted into fundamental voltage V
BASEAfter be sent to first end of switch SW 6.When control signal PH1 is high potential (this moment, control signal PH2 was an electronegative potential), switch SW 6, SW9, SW10 and SW11 can present short circuit, and switch SW 7, SW8 and SW12 can present open circuit.Therefore, fundamental voltage V
BASECan charge the rough fundamental voltage V that equals of current potential that lets capacitor C 2 and C3 store to capacitor C 2 and C3 respectively
BASECurrent potential.When control signal PH2 is high potential (this moment, control signal PH1 was an electronegative potential), switch SW 7, SW8 and SW12 can present short circuit, and switch SW 6, SW9, SW10 and SW11 can present open circuit, make second end of capacitor C 2 be connected to fundamental voltage V from ground connection changing into
BASE(that is change into V from 0V
BASE), first terminal potential of capacitor C 2 can be from rough fundamental voltage V
BASECurrent potential is raised to rough 2V
BASESimultaneously, capacitor C 3 first ends (that is are changed into 2V from 0V from first end that ground connection changing into is connected to capacitor C 2
BASE), second terminal potential of capacitor C 3 can be from rough fundamental voltage V
BASECurrent potential is raised to rough 3V
BASESo output voltage V
OUT2About slightly fundamental voltage V of three times
BASEOutput capacitance C
OUT2Let output voltage V
OUT2More stable.
Resistance R 3 and R4 are series between the output and ground connection of charge pump 202, with output voltage V
OUT2Dividing potential drop is as control signal V
CLControl signal V
CLWill be transmitted to first end of operational amplifier OP1.When the curtage of charge pump 202 outputs because of load (not illustrating) when changing, resistance R 3 and R4 can pass through control signal V
CLReflect its variation.Because control signal V
CLChange along with charge pump 202 outputs; Therefore operational amplifier OP1 can respond the variation of charge pump 202 outputs and dynamic oxide-semiconductor control transistors Tr1 makes transistor Tr 1 adjust its fundamental voltage V in response to the variation of charge pump 202 outputs fast
BASEBy this, present embodiment can be exported the rough fundamental voltage V that is three times in
BASEOutput voltage V
OUT2, and reach the electric current variation of dynamical feedback output and the function of carrying out voltage stabilizing, related minimizing output voltage V
OUT2Ripple.
Fig. 6 is dynamic feedback stabilized charge pump device 600 circuit diagrams of the 4th execution mode according to an embodiment of the invention.Comparison diagram 5 and Fig. 6, its identical function gives identical label, can find that its difference is switch SW 1, SW6 and the capacitor C 2 in the dynamic feedback stabilized charge pump device 600.First termination of switch SW 1 is received system voltage V
DD, its second end couples the output of operational amplifier OP1.First termination of switch SW 6 is received system voltage V
DDSecond end of capacitor C 2 then directly couples the drain electrode of transistor Tr 1.Compare with Fig. 5, present embodiment saves the switch SW 7 that can tolerate big electric current, and disposes the switch SW 1 of a small size.
With reference to Fig. 3 B key diagram 6, control signal PH2B is the anti-phase of control signal PH2 equally.When control signal PH1 is high potential (this moment, control signal PH2 was an electronegative potential, and control signal PH2B is a high potential), switch SW 1, SW6, SW9, SW10 and SW11 can present short circuit, and switch SW 8 and SW12 can present open circuit.The short circuit of switch SW 1 makes transistor Tr 1 can present not conducting (ending).During this period, system voltage V
DDCan charge to capacitor C 2 and C3 respectively via switch SW 6, SW10, let capacitor C 2 and C3 store the rough system voltage V that equals
DDCurrent potential.Because of system voltage V
DDFor can be directly to the relation of capacitor C 2 and C3 charging, its charging rate can be faster.When control signal PH2 is high potential (control signal PH2B, PH1 are electronegative potential at this moment), switch SW 8 and SW12 can present short circuit, and switch SW 1, SW6, SW9, SW10 and SW11 can present open circuit.Transistor Tr 1 receives the control of operational amplifier OP1 and exports fundamental voltage V
BASEGive second end of capacitor C 2.Second end by capacitor C 2 changes fundamental voltage V into from ground connection (that is 0V)
BASE, cause first terminal potential of capacitor C 2 can be from V
DDBe raised to V
DD+ V
BASESimultaneously, first end of C3 changes first end of capacitor C 2 into from ground connection (that is 0V), causes second terminal potential of capacitor C 3 can be from V
DDBe raised to 2V
DD+ V
BASEAbove-mentioned 2V
DD+ V
BASECan be exported as output voltage V via switch SW 12
OUT2
Resistance R 3 and R4 are series between the output and ground connection of charge pump 202, with output voltage V
OUT2Dividing potential drop is as control signal V
CLControl signal V
CLWill be transmitted to first end of operational amplifier OP1.When the curtage of charge pump 202 outputs because of load (not illustrating) when changing, feedback unit 203 can be through control signal V
CLReflect its variation.Because control signal V
CLChange along with charge pump 202 outputs; Therefore operational amplifier OP1 can respond variation and the dynamic oxide-semiconductor control transistors Tr1 of charge pump 202 outputs, makes the variation that transistor Tr 1 can fast reaction charge pump 202 outputs and adjusts its fundamental voltage V
BASE, and then the output voltage V of adjustment charge pump 202
OUT2By this, present embodiment can reach the variation of dynamical feedback output and pass on its function that is reacted to output and then voltage stabilizing, related minimizing output voltage V faster
OUT2Ripple and promote delivery efficiency.
Fig. 7 is dynamic feedback stabilized charge pump device 700 circuit diagrams of the 5th execution mode according to an embodiment of the invention.Voltage adjuster 201 and feedback unit 203 are of above-mentioned Fig. 3 A embodiment, so repeat no more.Charge pump 202 comprises that the 4th capacitor C 4, the 5th capacitor C the 5, the 13 switch SW the 13, the 14 switch SW the 14, the 15 switch SW 15, sixteenmo close that SW16, the tenth minion close SW17, eighteenmo closes SW18, the 19 switch SW 19 and output capacitance C
OUT2First end of switch SW 13 couples the drain electrode of transistor Tr 1 to receive fundamental voltage V
BASE, first end of its second end coupling capacitance C4.First end of switch SW 14 couples first end of switch SW 13, second end of its second end coupling capacitance C4.Second end of the first end coupling capacitance C4 of switch SW 15, its second termination is received earthed voltage.First end of switch SW 16 couples first end of coupling capacitance C4, first end of its second end coupling capacitance C5.First end of switch SW 17 couples first end of switch SW 13, second end of its second end coupling capacitance C5.Second end of the first end coupling capacitance C5 of switch SW 18, its second termination is received earthed voltage.First end of the first end coupling capacitance C5 of switch SW 19, the output that its second end is a charge pump 202 is to provide output voltage V
OUT2Output capacitance C
OUT2First end couple second end of switch SW 19, its second end couples earthed voltage.Those skilled in the art can look demand and omit output capacitance C
OUT2
Equally with reference to Fig. 3 B key diagram 7.As transistor Tr 1 receiving system voltage V
DDThe time, can be according to the control of operational amplifier OP1 with system voltage V
DDBe adjusted into fundamental voltage V
BASEAfter be sent to first end of switch SW 13.When control signal PH1 is high potential (this moment, control signal PH2 was an electronegative potential), switch SW 13, SW15, SW17 and SW19 can present short circuit, and switch SW 14, SW16 and SW18 can present open circuit.During this period, fundamental voltage V
BASECan charge the rough fundamental voltage V that equals of current potential that lets capacitor C 4 store to capacitor C 4
BASECurrent potential.Simultaneously, second end of capacitor C 5 is connected to fundamental voltage V from ground connection changing into
BASE(that is change into V from 0V
BASE), first terminal potential of capacitor C 5 can be from 2V
BASE(this current potential obtains during for high potential in control signal PH2) is raised to 3V
BASESo output voltage V
OUT2About slightly fundamental voltage V of three times
BASEWhen control signal PH2 was high potential, switch SW 14, SW16 and SW18 can present short circuit, and switch SW 13, SW15, SW17 and SW19 can present open circuit.At this moment, second end of capacitor C 4 is connected to fundamental voltage V from ground connection changing into
BASE(that is change into V from 0V
BASE), first terminal potential of capacitor C 4 can be from fundamental voltage V
BASECurrent potential is raised to 2V
BASESimultaneously, first end of capacitor C 5 can connect first end of capacitor C 4, and its second end can ground connection, makes the first terminal potential 2V of capacitor C 4
BASETo capacitor C 5 chargings, the rough 2V of equaling of current potential that lets capacitor C 5 store
BASECurrent potential.Output capacitance C
OUT2Let output voltage V
OUT2More stable.
Resistance R 3 and R4 are series between the output and ground connection of charge pump 202, with output voltage V
OUT2Dividing potential drop is as control signal V
CLControl signal V
CLWill be transmitted to first end of operational amplifier OP1.When the curtage of charge pump 202 outputs because of load (not illustrating) when changing, resistance R 3 and R4 can pass through control signal V
CLReflect its variation.Because control signal V
CLChange along with charge pump 202 outputs; Therefore operational amplifier OP1 can respond the variation of charge pump 202 outputs and dynamic oxide-semiconductor control transistors Tr1 makes transistor Tr 1 adjust its fundamental voltage V in response to the variation of charge pump 202 outputs fast
BASEBy this, present embodiment can be exported the rough fundamental voltage V that is three times in
BASEOutput voltage V
OUT2, and reach the electric current variation of dynamical feedback output and the function of carrying out voltage stabilizing, related minimizing output voltage V
OUT2Ripple.
Fig. 8 is dynamic feedback stabilized charge pump device 800 circuit diagrams of the 6th execution mode according to an embodiment of the invention.Comparison diagram 7 and Fig. 8, its identical function gives identical label, can find that its difference is switch SW 1, SW13, SW14 and the capacitor C 4 in the dynamic feedback stabilized charge pump device 800.First termination of switch SW 1 is received system voltage V
DD, its second end couples the output of operational amplifier.First termination of switch SW 13 is received system voltage V
DDFirst end of switch SW 14 couples first end of switch SW 13.Second end of capacitor C 5 then directly couples the drain electrode of transistor Tr 1.Compare with Fig. 5, present embodiment saves the switch SW 17 that can tolerate big electric current, and disposes the switch SW 1 of a small size.
With reference to Fig. 3 B key diagram 8, control signal PH1B is the anti-phase of control signal PH1 equally.When control signal PH1 is high potential (control signal PH2, PH1B are electronegative potential at this moment), switch SW 13, SW15 and SW19 can present short circuit, and switch SW 1, SW14, SW16 and SW18 can present open circuit.Transistor Tr 1 receives the control of operational amplifier OP1 and exports fundamental voltage V
BASEGive second end of capacitor C 5.During this period, system voltage V
DDCan charge via 13 pairs of capacitor C 4 of switch SW, let capacitor C 4 store the rough system voltage V that equals
DDCurrent potential.Second end of capacitor C 5 is connected to fundamental voltage V from ground connection changing into
BASE(that is change into V from 0V
BASE), first terminal potential of capacitor C 5 can be from 2V
DD(this current potential obtains during for high potential in control signal PH2) is raised to 2V
DD+ V
BASEAbove-mentioned 2V
DD+ V
BASECan be exported as output voltage V via switch SW 12
OUT2When control signal PH2 is high potential (this moment, control signal PH1 was that electronegative potential, PH1B are high potential), switch SW 1, SW14, SW16 and SW18 can present short circuit, and SW13, SW15 and SW19 can present open circuit.The short circuit of switch SW 1 makes transistor Tr 1 can present not conducting (ending).This moment, second end of capacitor C 4 was connected to system voltage V from ground connection changing into
DD(that is change into V from 0V
DD), first terminal potential of capacitor C 4 can be from system voltage V
DDCurrent potential is raised to 2V
DDSimultaneously, first end of capacitor C 5 can connect first end of capacitor C 4, and its second end can ground connection, makes the first terminal potential 2V of capacitor C 4
DDTo capacitor C 5 chargings, the rough 2V of equaling of current potential that lets capacitor C 5 store
DDBecause of system voltage V
DDBe the relation that can directly charge to capacitor C 4, its charging rate can be faster.Output capacitance C
OUT2Let output voltage V
OUT2More stable.
Resistance R 3 and R4 are series between the output and ground connection of charge pump 202, with output voltage V
OUT2Dividing potential drop is as control signal V
CLControl signal V
CLWill be transmitted to first end of operational amplifier OP1.When the curtage of charge pump 202 outputs because of load (not illustrating) when changing, feedback unit 203 can be through control signal V
CLReflect its variation.Because control signal V
CLChange along with charge pump 202 outputs; Therefore operational amplifier OP1 can respond variation and the dynamic oxide-semiconductor control transistors Tr1 of charge pump 202 outputs, makes the variation that transistor Tr 1 can fast reaction charge pump 202 outputs and adjusts its fundamental voltage V
BASE, and then the output voltage V of adjustment charge pump 202
OUT2By this, present embodiment can reach the variation of dynamical feedback output and pass on its function that is reacted to output and then voltage stabilizing, related minimizing output voltage V more quickly
OUT2Ripple and promote delivery efficiency.
In sum; At dynamic feedback stabilized charge pump device of the present invention,, can react to its variation apace through the load current variation of direct its output of feedback; The voltage that makes output is not for fluctuating because of change in current; Can reduce the ripple of output voltage by this, and utilize system voltage that electric capacity is directly charged, can promote the efficient of its output.In conjunction with above argument, the electric current that dynamic feedback stabilized charge pump device of the present invention could detect and feed back its output in real time changes, and can feed back its electric current apace and change and react at output.
Though the present invention discloses as above with preferred embodiment; Right its is not in order to limit the present invention; Any those skilled in the art; Do not breaking away from the spirit and scope of the present invention, when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking appended the claim scope person of defining.
Claims (13)
1. charge pump device comprises:
Voltage adjuster in order to receiving input voltage, and is output as fundamental voltage according to control signal with this input voltage adjustment;
Charge pump, the output that is coupled to this voltage adjuster to be receiving this fundamental voltage, and with after this fundamental voltage multiplication of voltage as output voltage; And
Feedback unit; Its input is coupled to the output of this charge pump to receive this output voltage; The output of this feedback unit is coupled to this voltage adjuster so that this control signal to be provided, and wherein this control signal is relevant with this output voltage, and wherein this voltage adjuster comprises:
Operational amplifier, its first end are coupled to the output of this feedback unit to receive this control signal, and second termination of this operational amplifier is received reference voltage;
Transistor, its grid is coupled to the output of this operational amplifier, its first source-drain electrode receives this input voltage, its second source-drain electrode as the output of this voltage adjuster to export this fundamental voltage; And
Switch, its first termination is received this input voltage, and its second end is coupled to the output of this operational amplifier.
2. charge pump device according to claim 1, wherein this transistor is the P-type mos transistor.
3. charge pump device according to claim 1, wherein this charge pump comprises:
Second switch, its first termination is received this input voltage;
First electric capacity, its first end is coupled to second end of this second switch, and second end of this first electric capacity is coupled to the output of this voltage adjuster to receive this fundamental voltage;
The 4th switch, its first end is coupled to first end of this first electric capacity, second end of the 4th switch as the output of this charge pump to export this output voltage; And
The 5th switch, its first end is coupled to second end of this first electric capacity, and second termination of the 5th switch is received second reference voltage.
4. charge pump device according to claim 3, wherein this second reference voltage is an earthed voltage.
5. charge pump device according to claim 3, wherein this charge pump also comprises output capacitance, and its first end is coupled to second end of the 4th switch, and second termination of this output capacitance is received this second reference voltage.
6. charge pump device according to claim 1, wherein this charge pump comprises:
The 6th switch, its first termination is received this input voltage;
Second electric capacity, its first end is coupled to second end of the 6th switch, and second end of this second electric capacity is coupled to the output of this voltage adjuster to receive this fundamental voltage;
The 3rd electric capacity;
Octavo is closed, and it is coupled between first end of first end and the 3rd electric capacity of this second electric capacity;
The 9th switch, its first end is coupled to second end of this second electric capacity, and second termination of the 9th switch is received second reference voltage;
The tenth switch, its first termination is received this input voltage, and its second end is coupled to second end of the 3rd electric capacity;
The 11 switch, its first end is coupled to first end of the 3rd electric capacity, and second termination of the 11 switch is received this second reference voltage; And
Twelvemo is closed, and its first end is coupled to second end of the 3rd electric capacity, second end that this twelvemo is closed as the output of this charge pump to export this output voltage.
7. charge pump device according to claim 6, wherein this second reference voltage is an earthed voltage.
8. charge pump device according to claim 6, wherein this charge pump also comprises output capacitance, and its first end is coupled to second end that this twelvemo is closed, and second termination of this output capacitance is received this second reference voltage.
9. charge pump device according to claim 1, wherein this charge pump comprises:
The 4th electric capacity;
The 5th electric capacity, wherein second end of the 5th electric capacity be coupled to this voltage adjuster output to receive this fundamental voltage;
The 13 switch, its first end is coupled to first end of the 4th electric capacity, and second termination of the 13 switch is received this input voltage;
The 14 switch, its first end is coupled to second end of the 4th electric capacity, and second termination of the 14 switch is received this input voltage;
The 15 switch, its first end is coupled to second end of the 4th electric capacity, and second termination of the 15 switch is received second reference voltage;
Sixteenmo closes, and it is coupled between first end of first end and the 5th electric capacity of the 4th electric capacity;
Eighteenmo closes, and its first end is coupled to second end of the 5th electric capacity, and second termination that this eighteenmo closes is received this second reference voltage; And
The 19 switch, its first end is coupled to first end of the 5th electric capacity, second end of the 19 switch as the output of this charge pump to export this output voltage.
10. charge pump device according to claim 9, wherein this second reference voltage is an earthed voltage.
11. charge pump device according to claim 9, wherein this charge pump also comprises output capacitance, and its first end is coupled to second end of the 19 switch, and second termination of this output capacitance is received this second reference voltage.
12. charge pump device according to claim 1, wherein this feedback unit comprises:
First resistance, to receive this output voltage, second end of this first resistance controls signal to this voltage adjuster as the output of this feedback unit so that this to be provided to its first end as the input of this feedback unit; And
Second resistance, its first end is coupled to second end of this first resistance, the second end ground connection of this second resistance.
13. charge pump device according to claim 1, wherein this input voltage is a system voltage.
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| CN2008100911112A CN101552552B (en) | 2008-04-02 | 2008-04-02 | Dynamic feedback stabilized charge pump device |
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| CN2008100911112A CN101552552B (en) | 2008-04-02 | 2008-04-02 | Dynamic feedback stabilized charge pump device |
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| CN101552552B true CN101552552B (en) | 2012-01-04 |
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| WO2015138378A1 (en) * | 2014-03-14 | 2015-09-17 | Arctic Sand Technologies, Inc. | Charge balanced charge pump control |
| ITUB20151005A1 (en) | 2015-05-27 | 2016-11-27 | St Microelectronics Srl | VOLTAGE REGULATOR WITH IMPROVED ELECTRICAL CHARACTERISTICS AND CORRESPONDING CONTROL METHOD |
| CN106130339A (en) * | 2016-06-27 | 2016-11-16 | 上海集成电路研发中心有限公司 | A kind of charge pump circuit of electric capacity without off-chip |
| US10140916B2 (en) * | 2017-02-03 | 2018-11-27 | Dazzo Technology Corporation | Charge pump and operating method thereof |
| CN107147282B (en) * | 2017-05-27 | 2019-07-19 | 普诚创智（成都）科技有限公司 | A kind of efficiently double capacitance charge pumps |
| TWI691156B (en) * | 2018-12-22 | 2020-04-11 | 緯穎科技服務股份有限公司 | Power supply system, switched-tank converter and power supply method thereof |
| CN111130340B (en) * | 2020-01-14 | 2021-08-17 | Oppo广东移动通信有限公司 | Power supply device, electronic equipment and power supply method |
| KR20210111565A (en) * | 2020-03-03 | 2021-09-13 | 에스케이하이닉스 주식회사 | Memory device and operating method thereof |
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| US6411531B1 (en) * | 2000-11-21 | 2002-06-25 | Linear Technology Corporation | Charge pump DC/DC converters with reduced input noise |
| CN1719704A (en) * | 2004-07-08 | 2006-01-11 | 沛亨半导体股份有限公司 | Charge pump dc/dc converter with constant-frequency operation |
| CN101136586A (en) * | 2006-08-31 | 2008-03-05 | 圆创科技股份有限公司 | Multi-mode charge pump driving circuit of improving input noise when switching modes |
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| US6411531B1 (en) * | 2000-11-21 | 2002-06-25 | Linear Technology Corporation | Charge pump DC/DC converters with reduced input noise |
| CN1719704A (en) * | 2004-07-08 | 2006-01-11 | 沛亨半导体股份有限公司 | Charge pump dc/dc converter with constant-frequency operation |
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