CN108776500A - It is a kind of based on frequency compensation and transient response improve circuit without capacitance LDO outside piece - Google Patents
It is a kind of based on frequency compensation and transient response improve circuit without capacitance LDO outside piece Download PDFInfo
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- CN108776500A CN108776500A CN201810550219.7A CN201810550219A CN108776500A CN 108776500 A CN108776500 A CN 108776500A CN 201810550219 A CN201810550219 A CN 201810550219A CN 108776500 A CN108776500 A CN 108776500A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
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Abstract
The invention discloses it is a kind of based on frequency compensation and transient response improve circuit without capacitance LDO outside piece, include mainly：Reference voltage V ref modules, two-stage error amplifier block, transient response improve circuit module, adjustment tube module, frequency compensation module, feedback resistive network module, load blocks.The present invention improves circuit module by the way that transient response is added between two-stage error amplifier block and adjustment tube module, can reduce overshoot voltage value and undershoot voltage value, reduce transient changing recovery time, improve transient response speed, improve the transient response of circuit；And by the way that frequency compensation module is added between two-stage error amplifier block and adjustment tube module the primary and secondary pole of error amplifier is detached, to improve the stability of circuit, while reducing the quality factor of LDO output end time poles, reduces on-chip capacitance.
Description
Technical field
The present invention relates to technical field of power management, more particularly to a kind of frequency compensation and transient response of being based on to improve circuit
Without capacitance LDO outside piece.
Background technology
With the development of power management techniques, low pressure difference linear voltage regulator (Low Dropout Regulator；LDO) quilt
It is widely used for the power management of various integrated circuits, there is output is stablized, voltage ripple is small, cheap, highly integrated etc.
Advantage.Traditional LDO outputs generally need the outer capacitance of contact pin, waste chip, are unfavorable for integrating.Output capacitance without capacitance LDO outside piece
It is the parasitic capacitance on capacitance bus, much smaller than the outer bulky capacitor of piece of tradition LDO loads.But there are transient states by capacitance LDO outside no piece
The problems such as difference in response and unstable loop.
Application number 201710367635.9 discloses capacitance LDO circuit outside a kind of no piece comprising error amplifier block,
Frequency compensation module, high voltage control module and Voltage Feedback output module；Error amplifier is for realizing input reference voltage
Amplify with the error of feedback voltage；Frequency compensation module is used to ensure the stability of LDO feedback control loops；High voltage control module is used
In the grid voltage for generating and controlling LDO adjustment pipes；Voltage Feedback output module respectively with error amplification module, frequency compensation mould
Block is connected with high voltage control module comprising NMOS transistor M14 be the adjustment pipe without capacitance LDO outside piece, for real
Existing LDO voltage outputs and feedback control.The shortcomings that patent is the stability that LDO is only improved with frequency compensation, not to electricity
Road transient response makes improvement, and the stability of the LDO of acquisition is poor.
Invention content
The purpose of the present invention is to provide it is a kind of based on frequency compensation and transient response improve circuit without capacitance outside piece
LDO.The present invention by two-stage error amplifier block and adjustment tube module between be added transient response improve circuit module with
And frequency compensation module, overshoot voltage value and undershoot voltage value can be both reduced, transient changing recovery time is reduced, improves transient state
Response speed improves the transient response of circuit, and the primary and secondary pole of error amplifier can be made to detach, to improve circuit
Stability, and reduce the quality factor of LDO output ends time pole, reduce on-chip capacitance.
To solve the above problems, the technical solution adopted by the present invention is：
It is a kind of based on frequency compensation and transient response improve circuit without capacitance LDO outside piece, including：Reference voltage V ref moulds
Block, two-stage error amplifier block, transient response improve circuit module, adjustment tube module, frequency compensation module, feedback resistance net
Network module, load blocks and input voltage vin and ground；
The reference voltage V ref modules are connected with the inverting input of the two-stage error amplifier block, the benchmark
Voltage Vref modules are connected to the ground；
The inverting input of the two-stage error amplifier block is connected with the reference voltage V ref modules, and positive is defeated
Enter end with the feedback resistive network module to be connected, output end improves the input terminal phase of circuit module with the transient response
Even, the two-stage error amplifier block is also connected with the frequency compensation module, the input voltage vin and ground respectively；
The input terminal that the transient response improves circuit module is connected with the output end of the two-stage error amplifier block,
Its output end is connected with the control terminal of the adjustment tube module, transient response improvement circuit module also respectively with the input
Voltage Vin is connected with ground；
The output end that the control terminal of the adjustment tube module improves circuit module with the transient response is connected, input terminal
Be connected with the input voltage vin, output end respectively with the frequency compensation module, the feedback resistive network module and institute
Load blocks are stated to be connected；
The frequency compensation module respectively with the feedback resistive network module, the load blocks and the two-stage error
The output end of amplifier module is connected；
The feedback resistive network module respectively with the normal phase input end of the two-stage error amplifier block, the adjustment
The output end of tube module, the frequency compensation module and ground are connected；
The load blocks are connected with output end, the frequency compensation module and the ground of the adjustment tube module respectively.
Preferably, the feedback voltage and institute that the two-stage error amplifier block exports the feedback resistive network module
The error stated between the reference voltage of reference voltage V ref modules is amplified, then through adjustment pipe die adjustment pipe tune in the block
Economize on electricity is depressed into the voltage output end in the load blocks, forms negative feedback closed loop system, the stabilization for ensureing output voltage.
Preferably, the transient response improves circuit module and is arranged in the two-stage error amplifier block and the adjustment
Between tube module, for reducing overshoot voltage value and undershoot voltage value, transient changing recovery time is reduced, transient response speed is improved
Degree, improves the transient response of circuit.
Preferably, frequency compensation module setting the two-stage error amplifier block and the adjustment tube module it
Between, for improving circuit stability.
Preferably, the frequency compensation module includes：First compensating electric capacity Ca, for so that the two-stage error amplifier
The primary and secondary pole separation of error amplifier in module, to improve the stability of circuit；Second compensating electric capacity Cb, for reducing
The quality factor of LDO output end time poles, reduce on-chip capacitance.
Compared with prior art, the beneficial effects of the present invention are 1) it is of the invention by the way that transient response improvement circuit is arranged,
Overshoot voltage value and undershoot voltage value are reduced, transient changing recovery time is reduced, improves transient response speed, improve
The transient response of circuit；2) present invention reduces quality factor, reduces on-chip capacitance value, improve by the way that frequency compensation module is arranged
The stability of LDO；3) present invention is LDO outside no piece, and on-chip capacitance is small, and the integrated level of LDO is increased while increasing stability；
4) present invention uses common electronic device, and circuit structure is simple, at low cost, is applied convenient for extensive generate.
Description of the drawings
Fig. 1 be according to embodiment it is a kind of based on frequency compensation and transient response improve circuit without capacitance LDO outside piece
Structural schematic diagram；
Fig. 2 is the circuit diagram for improving circuit according to the two-stage error amplifier and transient response of embodiment.
Specific implementation mode
Clear, complete description is carried out to the technical solution of various embodiments of the present invention below with reference to attached drawing, it is clear that retouched
A part of the embodiment that hair embodiment is only the present invention is stated, instead of all the embodiments.Based on the embodiment of the present invention, originally
Field those of ordinary skill obtained all other embodiment without making creative work, belongs to this hair
Bright protected range.
Referring to Fig. 1, Fig. 1 be according to embodiment it is a kind of based on frequency compensation and transient response improve circuit without piece outside
The structural schematic diagram of capacitance LDO.As shown, in an embodiment of the present invention, one kind is changed based on frequency compensation and transient response
Kind circuit without capacitance LDO outside piece, including：Reference voltage V ref modules, two-stage error amplifier block, transient response improve electricity
Road module, adjustment tube module, frequency compensation module, feedback resistive network module, load blocks and input voltage vin and ground；
The reference voltage V ref modules are connected with the inverting input of the two-stage error amplifier block, the reference voltage V ref
Module is connected to the ground；The inverting input of the two-stage error amplifier block is connected with the reference voltage V ref modules,
Normal phase input end is connected with the feedback resistive network module, and output end improves the input of circuit module with the transient response
End be connected, the two-stage error amplifier block also respectively with the frequency compensation module, the input voltage vin and ground phase
Even；The input terminal that the transient response improves circuit module is connected with the output end of the two-stage error amplifier block, defeated
Outlet is connected with the control terminal of the adjustment tube module, transient response improvement circuit module also respectively with the input voltage
Vin is connected with ground；The output end that the control terminal of the adjustment tube module improves circuit module with the transient response is connected, defeated
Enter end be connected with the input voltage vin, output end respectively with the frequency compensation module, the feedback resistive network module
It is connected with the load blocks；The frequency compensation module respectively with the feedback resistive network module, the load blocks and
The output end of the two-stage error amplifier block is connected；The feedback resistive network module is amplified with the two-stage error respectively
The normal phase input end of device module, output end, the frequency compensation module and the ground for adjusting tube module are connected；The load
Module is connected with output end, the frequency compensation module and the ground of the adjustment tube module respectively.
Referring to Fig. 2, Fig. 2 is the circuit signal for improving circuit according to the two-stage error amplifier and transient response of embodiment
Figure.As shown, one that voltage source generates on the basis of the reference voltage V ref modules reference electricity close to zero-temperature coefficient
Pressure, the grid of the 5th power tube P5 of the reference voltage V ref modules connection p-type.
The two-stage error amplifier block includes：The first power tube of p-type P1, the second power tube of p-type P2, p-type third work(
Rate pipe P3, the 4th power tube P4 of p-type, the 5th power tube P5 of p-type, the 6th power tube P6 of p-type, the 7th power tube P7 of p-type, p-type
Eight power tube P8, the first power tube of N-type N1, the second power tube of N-type N2, N-type third power tube N3, N-type the 4th power tube N4, N
The 5th power tube N5 of type, N-type the 6th power tube N6 and the 7th power tube N7 of N-type, aforementioned p-type power tube are PMOS tube, N-type work(
Rate pipe is NMOS tube.
The specific connection type of two-stage error amplifier block is as follows：
The source electrode of grid connection the first power tube of p-type P1 of the first power tube of p-type P1, the grid of the second power tube of p-type P2
With the drain electrode of the first power tube of N-type N1；The grid of source electrode connection the first power tube of the p-type P1 of the first power tube of p-type P1, p-type the
The drain electrode of the grid and the first power tube of N-type N1 of two power tube P2；The drain electrode of the first power tube of p-type P1 connects input voltage vin；
The grid of grid connection the first power tube of p-type P1 of the second power tube of p-type P2, the source electrode of the first power tube of p-type P1
With the drain electrode of the first power tube of N-type N1；The drain electrode of source electrode connection p-type the 5th power tube P5 of the second power tube of p-type P2 and p-type the
The drain electrode of six power tube P6；The drain electrode of the second power tube of p-type P2 connects input voltage vin；
The source electrode of the grid connection p-type third power tube P3 of p-type third power tube P3, the grid of the 4th power tube P4 of p-type,
The drain electrode of the grid and the second power tube of N-type N2 of the 8th power tube P8 of p-type；The source electrode of p-type third power tube P3 connects p-type third
The grid of power tube P3, the grid of the 4th power tube P4 of p-type, the grid of the 8th power tube P8 of p-type and the second power tube of N-type N2
Drain electrode；The drain electrode of p-type third power tube P3 connects input voltage vin；
The grid of the grid connection p-type third power tube P3 of the 4th power tube P4 of p-type, the source electrode of p-type third power tube P3,
The drain electrode of the grid and the second power tube of N-type N2 of the 8th power tube P8 of p-type；The source electrode of the 4th power tube P4 of p-type connects N-type the 5th
The drain electrode of power tube N5, the grid of the 7th power tube P7 of p-type, the grid of the 9th power tube P9 of p-type, the tenth power tube P10 of p-type
One end of grid and the first compensating electric capacity Ca；The drain electrode of the 4th power tube P4 of p-type connects input voltage vin；
The grid of the 5th power tube P5 of p-type connects the reference voltage V ref modules；The source electrode of the 5th power tube P5 of p-type connects
Connect the grid of the second power tube of N-type N2, the grid of N-type third power tube N3, the drain electrode of N-type third power tube N3, the 8th work(of N-type
The grid of the 9th power tube N9 of grid and N-type of rate pipe N8；Drain electrode connection the second power tube of p-type P2 of the 5th power tube P5 of p-type
The 6th power tube P6 of source electrode and p-type drain electrode；
The grid of the 6th power tube P6 of p-type connects one end of one end and the second feedback resistance R2 of the first feedback resistance R1；P
The drain electrode of the 4th power tube N4 of source electrode connection N-type of the 6th power tube P6 of type, grid, the 5th work(of N-type of the 4th power tube N4 of N-type
One end of the grid of rate pipe N5 and the second compensating electric capacity Cb；Drain electrode connection the second power tube of p-type P2's of the 6th power tube P6 of p-type
The drain electrode of the 5th power tube P5 of source electrode and p-type；
The source electrode of grid connection p-type the 4th power tube P4 of the 7th power tube P7 of p-type, the grid of the 9th power tube P9 of p-type,
One end of the drain electrode and the first compensating electric capacity Ca of the grid, the 5th power tube N5 of N-type of the tenth power tube P10 of p-type；The 7th work(of p-type
The drain electrode of the 6th power tube N6 of source electrode connection N-type of rate pipe P7, the 7th power tube N7 of grid and N-type of the 6th power tube N6 of N-type
Grid；The drain electrode of the 7th power tube P7 of p-type connects input voltage vin；
The grid of the grid connection p-type third power tube P3 of the 8th power tube P8 of p-type, the source electrode of p-type third power tube P3,
The drain electrode of the grid and the second power tube of N-type N2 of the 4th power tube P4 of p-type；The source electrode of the 8th power tube P8 of p-type connects N-type the 7th
The drain electrode of power tube N7, the source electrode of the 11st power tube P11 of p-type, the drain electrode of the tenth power tube N10 of N-type, the second compensating electric capacity Cb
One end and the first adjustment pipe Mp grid；The drain electrode of the 8th power tube P8 of p-type connects input voltage vin；
The grid of the first power tube of N-type N1 connects the first bias voltage Vbias；The drain electrode of the first power tube of N-type N1 connects P
The grid of the source electrode of the first power tube of type P1, the grid and the second power tube of p-type P2 of the first power tube of p-type P1；The first power of N-type
The source electrode connection ground of pipe N1；
The source electrode of grid connection p-type the 5th power tube P5 of the second power tube of N-type N2, the grid of N-type third power tube N3,
The drain electrode of N-type third power tube N3, the 9th power tube N9 of grid and N-type of the 8th power tube N8 of N-type grid；The second work(of N-type
The source electrode of drain electrode connection p-type third power tube P3 of rate pipe N2, the grid of p-type third power tube P3, the 4th power tube P4 of p-type
The grid of the 8th power tube P8 of grid and N-type；The source electrode connection ground of the second power tube of N-type N2；
The source electrode of grid connection p-type the 5th power tube P5 of N-type third power tube N3, the grid of the second power tube of N-type N2,
The drain electrode of N-type third power tube N3, the 9th power tube N9 of grid and N-type of the 8th power tube P8 of N-type grid；N-type third work(
The grid of drain electrode connection N-type third power tube N3 of rate pipe N3, the source electrode of the 5th power tube P5 of p-type, the second power tube of N-type N2
Grid, the 8th power tube N8 of N-type the 9th power tube N9 of grid and N-type grid；The source electrode of N-type third power tube N3 connects
Ground；
The drain electrode of the source electrode, the 4th power tube N4 of N-type of the 6th power tube P6 of grid connection p-type of the 4th power tube N4 of N-type,
One end of the grid and the second compensating electric capacity Cb of the 5th power tube N5 of N-type；The drain electrode of the 4th power tube N4 of N-type connects p-type the 6th
The source electrode of power tube P6, the grid of the 4th power tube N4 of N-type, the grid of the 5th power tube N5 of N-type and the second compensating electric capacity Cb
One end；The source electrode connection ground of the 4th power tube N4 of N-type；
The drain electrode of the source electrode, the 4th power tube N4 of N-type of the 6th power tube P6 of grid connection p-type of the 5th power tube N5 of N-type,
One end of the grid and the second compensating electric capacity Cb of the 4th power tube N4 of N-type；The drain electrode of the 5th power tube N5 of N-type connects p-type the 4th
The source electrode of power tube P4, the grid of the 7th power tube P7 of p-type, the grid of the 9th power tube P9 of p-type, the tenth power tube P10 of p-type
One end of grid and the first compensating electric capacity Ca；The source electrode connection ground of the 5th power tube N5 of N-type；
The drain electrode of the 6th power tube N6 of grid connection N-type of the 6th power tube N6 of N-type, the source electrode of the 7th power tube P7 of p-type
With the grid of the 7th power tube N7 of N-type；The grid of drain electrode connection N-type the 6th power tube N6 of the 6th power tube N6 of N-type, p-type the
The grid of the 7th power tube N7 of source electrode and N-type of seven power tube P7；The source electrode of the 6th power tube N6 of N-type is grounded；
The drain electrode of the 6th power tube N6 of grid connection N-type of the 7th power tube N7 of N-type, the source electrode of the 7th power tube P7 of p-type
With the grid of the 6th power tube N6 of N-type；The source electrode of drain electrode connection p-type the 8th power tube P8 of the 7th power tube N7 of N-type, p-type the
The source electrode of 11 power tube P11, the drain electrode of the tenth power tube N10 of N-type, one end of the second compensating electric capacity Cb and the first adjustment pipe Mp
Grid；The source electrode of the 7th power tube N7 of N-type is grounded.
The transient response improves circuit module：The 9th power tube P9 of p-type, the tenth power tube P10 of p-type, p-type the tenth
One power tube P11, the 12nd power tube P12 of p-type, the 8th power tube N8 of N-type, the 9th power tube N9 of N-type, the tenth power tube of N-type
N10, the 11st power tube N11 of N-type, the 12nd power tube N12 of N-type, aforementioned p-type power tube are PMOS tube, and N-type power tube is equal
For NMOS tube.
It is as follows that the transient response improves the specific connection type of circuit module：
The source electrode of grid connection p-type the 4th power tube P4 of the 9th power tube P9 of p-type, the grid of the 7th power tube P7 of p-type,
One end of the drain electrode and the first compensating electric capacity Ca of the grid, the 5th power tube N5 of N-type of the tenth power tube P10 of p-type；The 9th work(of p-type
The drain electrode of the 8th power tube N8 of source electrode connection N-type of rate pipe P9, grid, the 12nd power of p-type of the 11st power tube P11 of p-type
The grid of the 11st power tube N11 of grid and N-type of pipe P12；The drain electrode of the 9th power tube P9 of p-type connects input voltage vin；
The source electrode of the 4th power tube P4 of grid connection p-type of the tenth power tube P10 of p-type, the grid of the 7th power tube P7 of p-type
Pole, the grid of the 9th power tube P9 of p-type, the 5th power tube N5 of N-type drain electrode and the first compensating electric capacity Ca one end；P-type the tenth
The drain electrode of the 9th power tube N9 of source electrode connection N-type of power tube P10, the grid of the tenth power tube N10 of N-type；The tenth power tube of p-type
The drain electrode of P10 connects input voltage vin；
The drain electrode of the 8th power tube N8 of grid connection N-type of the 11st power tube P11 of p-type, the source of the 9th power tube P9 of p-type
Pole, the 12nd power tube P12 of p-type the 11st power tube N11 of grid and N-type grid；The source of the 11st power tube P11 of p-type
The drain electrode of pole the 7th power tube N7 of connection N-type, the drain electrode of the source electrode, the tenth power tube N10 of N-type of the 8th power tube P8 of p-type, second
The grid of one end and the first adjustment pipe Mp of compensating electric capacity Cb；The drain electrode of the 11st power tube P11 of p-type connects input voltage vin；
The drain electrode of the 8th power tube N8 of grid connection N-type of the 12nd power tube P12 of p-type, the source of the 9th power tube P9 of p-type
Pole, the 11st power tube P11 of p-type the 11st power tube N11 of grid and N-type grid；The source of the 12nd power tube P12 of p-type
Pole connects the grid of the 12nd power tube N12 of drain electrode and N-type of the 11st power tube N11 of N-type；The 12nd power tube P12's of p-type
Drain electrode connection input voltage vin；
The source electrode of grid connection p-type the 5th power tube P5 of the 8th power tube N8 of N-type, the grid of the second power tube of N-type N2,
The drain electrode of N-type third power tube N3, the 9th power tube N9 of grid and N-type of N-type third power tube N3 grid；The 8th work(of N-type
The source electrode of the 9th power tube P9 of drain electrode connection p-type of rate pipe N8, grid, the 12nd power of p-type of the 11st power tube P11 of p-type
The grid of the 11st power tube N11 of grid and N-type of pipe P12；The source electrode of the 8th power tube N8 of N-type is grounded；
The source electrode of grid connection p-type the 5th power tube P5 of the 9th power tube N9 of N-type, the grid of the second power tube of N-type N2,
The drain electrode of N-type third power tube N3, the 8th power tube N 8 of grid and N-type of N-type third power tube N3 grid；The 9th work(of N-type
The grid of the tenth power tube N10 of source electrode and N-type of the tenth power tube P10 of drain electrode connection p-type of rate pipe N9；The 9th power tube of N-type
The source electrode of N9 is grounded；
The leakage of the 9th power tube N9 of source electrode and N-type of the tenth power tube P10 of grid connection p-type of the tenth power tube N10 of N-type
Pole；Source electrode, the drain electrode of the 7th power tube N7 of N-type, the P of the 11st power tube P11 of drain electrode connection p-type of the tenth power tube N10 of N-type
The source electrode of the 8th power tube P8 of type, one end and the first adjustment pipe Mp of the second compensating electric capacity Cb grid；The tenth power tube of N-type
The source electrode of N10 is grounded；
The drain electrode of the 8th power tube N8 of grid connection N-type of the 11st power tube N11 of N-type, the source of the 9th power tube P9 of p-type
Pole, the 11st power tube P11 of p-type the 12nd power tube P12 of grid and p-type grid；The leakage of the 11st power tube N11 of N-type
Pole connects the grid of the 12nd power tube N12 of source electrode and N-type of the 12nd power tube P12 of p-type；The 11st power tube N11's of N-type
Source electrode is grounded；
The 12nd power tube of drain electrode and p-type of the 11st power tube N11 of grid connection N-type of the 12nd power tube N12 of N-type
The source electrode of P12；The source electrode of the drain electrode connection adjustment pipe Mp of the 12nd power tube N12 of N-type, one end of the first compensating electric capacity Ca, the
One end of one feedback resistance R1, one end and load resistance RL of capacitance CL one end；The source electrode of the 12nd power tube N12 of N-type connects
Ground.
The adjustment tube module is adjustment pipe Mp.Adjust source electrode, the N of the 11st power tube P11 of grid connection p-type of pipe Mp
The drain electrode of the 7th power tube N7 of type, the drain electrode of the source electrode, the tenth power tube N10 of N-type of the 8th power tube P8 of p-type and the second compensation electricity
Hold one end of Cb；Adjust the drain electrode of the 12nd power tube N12 of source electrode connection N-type of pipe Mp, one end of the first feedback resistance R1, the
One end of one compensating electric capacity Ca, one end and load resistance RL of capacitance CL one end；The drain electrode for adjusting pipe Mp connects input voltage
Vin。
The frequency compensation module includes the first compensating electric capacity Ca and the second compensating electric capacity Cb.The one of first compensating electric capacity Ca
The grid of end the tenth power tube P10 of connection p-type, the grid of the 9th power tube P9 of p-type, the source electrode of the 4th power tube P4 of p-type, p-type
The drain electrode of the 5th power tube N5 of grid and N-type of 7th power tube P7；The source electrode of its other end connection adjustment pipe Mp, N-type the tenth
The drain electrode of two power tube N12, one end of the first feedback resistance R1, capacitance CL one end and load resistance RL one end.
Source electrode, the drain electrode of the 4th power tube N4 of N-type, the N of one end the 6th power tube P6 of connection p-type of second compensating electric capacity Cb
The grid of the 5th power tube N5 of grid and N-type of the 4th power tube N4 of type；Its other end connects the leakage of the 7th power tube N7 of N-type
Pole, the source electrode of the 8th power tube P8 of p-type, the source electrode of the 11st power tube P11 of p-type, the drain electrode of the tenth power tube N10 of N-type and
The grid of one adjustment pipe Mp.
First compensating electric capacity Ca of the frequency compensation module makes the primary and secondary pole of error amplifier detach, to improve
The stability of circuit.Meanwhile N-type the 4th power tube N4 and the 5th power tube N5 of N-type of two-stage error amplifier block are formed
Current buffering area and the second compensating electric capacity Cb of frequency compensation module reduce the quality factor of time pole, improve circuit stability
Property, but also the first compensating electric capacity Ca capacitances of frequency compensation module reduce, reduce on-chip capacitance.
The feedback resistive network module includes the first feedback resistance R1 and the second feedback resistance R2.First feedback resistance R1
One end connection p-type the 6th power tube P6 grid, the other end connects one end of the first compensating electric capacity Ca, the first adjustment pipe Mp
Source electrode, capacitance CL one end and load resistance RL one end.One end the 6th power tube P6 of connection p-type of second feedback resistance R2
Grid, the other end ground connection.
The load blocks include capacitance CL and load resistance RL.One end of capacitance CL connects the one of the first compensating electric capacity Ca
It holds, one end of the drain electrode and load resistance RL of the source electrode of the first adjustment pipe Mp, the 12nd power tube N12 of N-type；Its another termination
Ground.One end connection one end of the first compensating electric capacity Ca of load resistance RL, the source electrode of the first adjustment pipe Mp, the 12nd power of N-type
The drain electrode of pipe N12, the first feedback resistance R1 one end and capacitance CL one end；Its other end is grounded.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, it will be understood by those of ordinary skill in the art that：It still may be used
To modify to the technical solution recorded in previous embodiment, either which part or all technical features are equal
It replaces；And these modifications or replacements, technical solution of the embodiment of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (5)
1. it is a kind of based on frequency compensation and transient response improve circuit without capacitance LDO outside piece, which is characterized in that including：Benchmark
Voltage Vref modules, two-stage error amplifier block, transient response improve circuit module, adjustment tube module, frequency compensation module,
Feedback resistive network module, load blocks and input voltage vin and ground；
The reference voltage V ref modules are connected with the inverting input of the two-stage error amplifier block, the reference voltage
Vref modules are connected to the ground；
The inverting input of the two-stage error amplifier block is connected with the reference voltage V ref modules, normal phase input end
It is connected with the feedback resistive network module, the input terminal that output end improves circuit module with the transient response is connected, institute
Two-stage error amplifier block is stated also respectively to be connected with the frequency compensation module, the input voltage vin and ground；
The input terminal that the transient response improves circuit module is connected with the output end of the two-stage error amplifier block, defeated
Outlet is connected with the control terminal of the adjustment tube module, transient response improvement circuit module also respectively with the input voltage
Vin is connected with ground；
The output end that the control terminal of the adjustment tube module improves circuit module with the transient response is connected, input terminal and institute
Input voltage vin is stated to be connected, output end respectively with the frequency compensation module, the feedback resistive network module and described negative
Module is carried to be connected；
The frequency compensation module is amplified with the feedback resistive network module, the load blocks and the two-stage error respectively
The output end of device module is connected；
The feedback resistive network module respectively with the normal phase input end of the two-stage error amplifier block, the adjustment pipe die
The output end of block, the frequency compensation module and ground are connected；
The load blocks are connected with output end, the frequency compensation module and the ground of the adjustment tube module respectively.
2. it is according to claim 1 it is a kind of based on frequency compensation and transient response improve circuit without capacitance LDO outside piece,
It is characterized in that, the feedback voltage that the two-stage error amplifier block exports the feedback resistive network module and the benchmark
Error between the reference voltage of voltage Vref modules is amplified, then adjusts voltage through adjustment pipe die adjustment pipe in the block
To the voltage output end in the load blocks, negative feedback closed loop system, the stabilization for ensureing output voltage are formed.
3. it is according to claim 1 it is a kind of based on frequency compensation and transient response improve circuit without capacitance LDO outside piece,
It is characterized in that, the transient response improves circuit module and is arranged in the two-stage error amplifier block and the adjustment tube module
Between, for reducing overshoot voltage value and undershoot voltage value, transient changing recovery time is reduced, transient response speed is improved, changes
The transient response of kind circuit.
4. it is according to claim 1 it is a kind of based on frequency compensation and transient response improve circuit without capacitance LDO outside piece,
It is characterized in that, the frequency compensation module is arranged between the two-stage error amplifier block and the adjustment tube module, uses
In raising circuit stability.
5. it is according to claim 4 it is a kind of based on frequency compensation and transient response improve circuit without capacitance LDO outside piece,
It is characterized in that, the frequency compensation module includes：First compensating electric capacity Ca, for so that in the two-stage error amplifier block
The primary and secondary pole of error amplifier detaches, to improve the stability of circuit；Second compensating electric capacity Cb, for reducing LDO outputs
The quality factor of end time pole, reduce on-chip capacitance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810550219.7A CN108776500A (en) | 2018-05-31 | 2018-05-31 | It is a kind of based on frequency compensation and transient response improve circuit without capacitance LDO outside piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810550219.7A CN108776500A (en) | 2018-05-31 | 2018-05-31 | It is a kind of based on frequency compensation and transient response improve circuit without capacitance LDO outside piece |
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| Publication Number | Publication Date |
|---|---|
| CN108776500A true CN108776500A (en) | 2018-11-09 |
Family
ID=64028312
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810550219.7A Pending CN108776500A (en) | 2018-05-31 | 2018-05-31 | It is a kind of based on frequency compensation and transient response improve circuit without capacitance LDO outside piece |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110632971A (en) * | 2019-11-06 | 2019-12-31 | 哈尔滨理工大学 | Error comparator with logic control and used for LDO anti-interference |
| CN112684846A (en) * | 2019-10-18 | 2021-04-20 | 圣邦微电子（北京）股份有限公司 | Error amplifier of low dropout regulator and low dropout regulator |
| CN112947670A (en) * | 2021-04-01 | 2021-06-11 | 苏州喻芯半导体有限公司 | LDO circuit capable of fast responding |
| CN114253330A (en) * | 2021-12-02 | 2022-03-29 | 电子科技大学 | Quick transient response's no off-chip capacitance low dropout linear voltage regulator |
| CN114578884A (en) * | 2021-05-03 | 2022-06-03 | 宁波奥拉半导体股份有限公司 | Linear regulator and system having the same |
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| 王欢等: "基于频率补偿和瞬态响应改善电路的低压差线性稳压器设计", 《机电信息》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112684846A (en) * | 2019-10-18 | 2021-04-20 | 圣邦微电子（北京）股份有限公司 | Error amplifier of low dropout regulator and low dropout regulator |
| CN110632971A (en) * | 2019-11-06 | 2019-12-31 | 哈尔滨理工大学 | Error comparator with logic control and used for LDO anti-interference |
| CN112947670A (en) * | 2021-04-01 | 2021-06-11 | 苏州喻芯半导体有限公司 | LDO circuit capable of fast responding |
| CN114578884A (en) * | 2021-05-03 | 2022-06-03 | 宁波奥拉半导体股份有限公司 | Linear regulator and system having the same |
| CN114578884B (en) * | 2021-05-03 | 2024-02-02 | 宁波奥拉半导体股份有限公司 | Linear voltage regulator and system with same |
| CN114253330A (en) * | 2021-12-02 | 2022-03-29 | 电子科技大学 | Quick transient response's no off-chip capacitance low dropout linear voltage regulator |
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Application publication date: 20181109 |