CN102393781A - Low-dropout linear voltage regulator circuit and system - Google Patents
Low-dropout linear voltage regulator circuit and system Download PDFInfo
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- CN102393781A CN102393781A CN2011103990724A CN201110399072A CN102393781A CN 102393781 A CN102393781 A CN 102393781A CN 2011103990724 A CN2011103990724 A CN 2011103990724A CN 201110399072 A CN201110399072 A CN 201110399072A CN 102393781 A CN102393781 A CN 102393781A
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Abstract
The invention provides a low-dropout linear voltage regulator circuit. The circuit comprises a power supply end, an inner ring control module, an outer ring control module, a reference voltage end, a feedback module, an output end and an earthing end, wherein the inner ring control module and the feedback module form a quick access with high bandwidth and low gain; the outer ring control module and the feedback module form a slow access with high gain and low bandwidth; the outer ring control module comprises a first operational amplifier, a first field-effect transistor connected with the first operational amplifier, a capacitor connected with the first operational amplifier and the first field-effect transistor, as well as a first resistor connected with the first field-effect transistor; the inner ring control module comprises a second operational amplifier, as well as a second field-effect transistor connected with the second operational amplifier; and the feedback module comprises a second resistor, a third resistor connected with the second resistor, as well as a fourth resistor connected with the third resistor. The invention also provides a low-dropout linear voltage regulator system. The circuit and the system have high-accuracy output and can realize quick response.
Description
Technical field
The present invention relates to a kind of mu balanced circuit and system, refer to a kind of low-dropout linear voltage-regulating circuit and system that has high precision output and can realize response fast especially.
Background technology
LDO (low dropout regulator) is a kind of low pressure difference linear voltage regulator, and it has low noise and is easy to advantages such as integrated, is widely used in the electronic system.
See also Fig. 1, Fig. 1 is the circuit structure of existing LDO, and wherein CMP is a single stage operational amplifier, and MP is a FET, and resistance R 11 constitutes feedback circuit with resistance R 22, and VREF ' is a reference voltage.Because whole loop will guarantee high-precision output valve; Must have high-gain, and high-gain and high bandwidth can't satisfy simultaneously usually, therefore the circuit structure of existing LDO often has the characteristics of low bandwidth; Promptly be difficult to realize response fast; Therefore when supply voltage VDD ' or load changed fast, output terminal VOUT ' will cause very big overshoot or descend, and need the long time just can return to normal output valve; This will reduce system performance greatly, even system is not worked.
Summary of the invention
In view of above content, be necessary to provide a kind of low-dropout linear voltage-regulating circuit and system that has high precision output and can realize response fast.
A kind of low-dropout linear voltage-regulating circuit; Said low-dropout linear voltage-regulating circuit comprise interior ring control module that a power end, links to each other with said power end, one with said power end and said in the reference voltage terminal that links to each other with said outer shroud control module of the outer shroud control module, that links to each other of ring control module, one with said in the feedback module that links to each other of ring control module and said outer shroud control module, one with the said interior earth terminal that output terminal and that control module and said feedback module link to each other links to each other with said feedback module that encircles; Ring control module and said feedback module form the fast path of a high bandwidth, low gain in said; Said outer shroud control module and said feedback module form the slow path of a high-gain, low bandwidth; Said outer shroud control module comprises first resistance that electric capacity and one that first FET, that one first operational amplifier, links to each other with said first operational amplifier links to each other with said first operational amplifier and said first FET links to each other with said first FET; The ring control module comprises second FET that one second operational amplifier and links to each other with said second operational amplifier in said, and said feedback module comprises the 4th resistance that the 3rd resistance and one that second resistance, one that links to each other with said second FET links to each other with said second resistance links to each other with said the 3rd resistance.
A kind of low pressure difference linearity voltage-stabilizing system; Said low pressure difference linearity voltage-stabilizing system comprise interior ring control module that a power end, links to each other with said power end, one with said power end and said in the reference voltage terminal that links to each other with said outer shroud control module of the outer shroud control module, that links to each other of ring control module, one with said in the feedback module that links to each other of ring control module and said outer shroud control module, one with the said interior earth terminal that output terminal and that control module and said feedback module link to each other links to each other with said feedback module that encircles; Ring control module and said feedback module formation one is used to realize the high bandwidth of response fast, the fast path of low gain in said, and said outer shroud control module and said feedback module form one and be used to realize having the high-gain of high precision output, the slow path of low bandwidth.
Relative prior art; Low-dropout linear voltage-regulating circuit of the present invention and system guarantee the precision of output terminal output voltage through slow path; Realization has the low-dropout linear voltage-regulating circuit and the system of high precision output; And make low-dropout linear voltage-regulating circuit and system to make rapid reaction to the quick variation of power end or load through fast path, rapidly the magnitude of voltage of output terminal output being adjusted to right value, thereby realize response fast.
Description of drawings
Fig. 1 is the circuit diagram of prior art mesolow difference linear voltage-stabilizing circuit.
Fig. 2 is the system architecture diagram of low pressure difference linearity voltage-stabilizing system preferred embodiments of the present invention.
Fig. 3 is the circuit diagram of low-dropout linear voltage-regulating circuit preferred embodiments of the present invention.
Embodiment
See also Fig. 2, low pressure difference linearity voltage-stabilizing system preferred embodiments of the present invention comprise reference voltage terminal VREF that interior ring control module that a power end VDD, links to each other with this power end VDD, links to each other with this outer shroud control module with this power end VDD and ring control module links to each other in this outer shroud control module,, one with this in encircle feedback module that control module and this outer shroud control module link to each other, one with this in encircle the earth terminal GND that output terminal VOUT and that control module and this feedback module link to each other links to each other with this outer shroud control module and this feedback module.
Should interiorly encircle control module and the common fast path that forms a high bandwidth, low gain of this feedback module; Make this low pressure difference linearity voltage-stabilizing system to make rapid reaction to the quick variation of this power end VDD or load; Magnitude of voltage rapidly this output terminal VOUT is exported is adjusted to right value, thereby realizes response fast; The common slow path that forms a high-gain, low bandwidth of this outer shroud control module and this feedback module; Make that this low pressure difference linearity voltage-stabilizing system can be when this power end VDD or load change; This output terminal VOUT exports accurate magnitude of voltage, thereby realizes having the low pressure difference linearity voltage-stabilizing system of high precision output.
See also Fig. 3, Fig. 3 is the circuit diagram of low-dropout linear voltage-regulating circuit preferred embodiments of the present invention.Wherein, this outer shroud control module comprises one first operational amplifier CMP1, one first FET MP1, a capacitor C 1 and one first resistance R 1; Should interior ring control module comprise one second operational amplifier CMP2 and one second FET MP2; This feedback module comprises one second resistance R 2, one the 3rd resistance R 3 and one the 4th resistance R 4.
The annexation of low-dropout linear voltage-regulating circuit preferred embodiments of the present invention is following: the inverting input of this first operational amplifier CMP1 links to each other with this reference voltage terminal VREF; The normal phase input end of this first operational amplifier CMP1 links to each other with an end of an end of the 3rd resistance R 3 and the 4th resistance R 4, and the output terminal of this first operational amplifier CMP1 links to each other with the grid of an end of this capacitor C 1 and this first FET MP1.The drain electrode of this first FET MP1 links to each other with the inverting input of an end of this first resistance R 1 and this second operational amplifier CMP2; The normal phase input end of this second operational amplifier CMP2 links to each other with an end of this second resistance R 2 and the other end of the 3rd resistance R 3, and the output terminal of this second operational amplifier CMP2 links to each other with the grid of this second FET MP2.The drain electrode of this second FET MP2 is connected this output terminal VOUT jointly with the other end of this second resistance R 2.The source class of the source class of the other end of this capacitor C 1, this first FET MP1 and this second FET MP2 connects this power end VDD jointly, and the other end of the other end of this first resistance R 1 and the 4th resistance R 4 connects this earth terminal GND jointly.
The principle of work of low-dropout linear voltage-regulating circuit of the present invention and system is following:
The loop gain of the fast path of at first supposing to be formed by ring control module and this feedback module in this is: H
(s)=A2/ ((s+w1) * (s+w2));
Wherein A2 is the low-frequency gain of fast path loop, and s is a frequency variable, and w1 is the inferior dominant pole of fast path loop, and w2 is the dominant pole of fast path loop, and w1>w2.
The loop gain of the slow path of supposing to be formed by this outer shroud control module and this feedback module is: H
(s)=A1/ ((s+w3) * (s+w4));
Wherein A1 is the low-frequency gain of slow path loop, and w3 is the inferior dominant pole of slow path loop, and w4 is the dominant pole of slow path loop, and w3>w4.
Again because w2>> w4, the open-loop gain that therefore can obtain whole loop is: Ho (s)=((R2+R3+R4)/R4) * H
(s) * H
(s)/(1+H
(s)) ((R2+R3+R4)/R4) * H
(s) for ≈;
It is thus clear that; The open-loop gain of whole loop is about the loop gain of slow path; Because slow path has high-gain, low bandwidth, thereby can guarantee the precision of output terminal VOUT output voltage, realizes having the low-dropout linear voltage-regulating circuit and the system of high precision output.
When the output voltage of output terminal VOUT receives the influence of power end VDD or load and changes fast; Its variation meeting directly and fast feeds back on the voltage V1 and voltage V3 shown in Figure 3 through second resistance R 2, the 3rd resistance R 3 and the 4th resistance R 4 in the feedback module; Because the bandwidth of slow path is lower; Therefore voltage V2 can keep approximate constant; Again because the bandwidth of fast path is higher, so voltage V1 can be passed to the grid of the second FET MP2 fast through the second operational amplifier CMP2, responds the transient changing of output terminal VOUT through regulating the second FET MP2.Because the bandwidth of fast path is higher; Thereby make low-dropout linear voltage-regulating circuit and system to make rapid reaction to the quick variation of power end VDD or load; Magnitude of voltage rapidly output terminal VOUT is exported is adjusted to right value, thereby realizes response fast.
Low-dropout linear voltage-regulating circuit of the present invention and system guarantee the precision of output terminal VOUT output voltage through slow path; Realization has the low-dropout linear voltage-regulating circuit and the system of high precision output; And make low-dropout linear voltage-regulating circuit and system to make rapid reaction to the quick variation of power end VDD or load through fast path; Magnitude of voltage rapidly output terminal VOUT is exported is adjusted to right value, thereby realizes response fast.
Claims (10)
1. low-dropout linear voltage-regulating circuit; It is characterized in that: said low-dropout linear voltage-regulating circuit comprise interior ring control module that a power end, links to each other with said power end, one with said power end and said in the reference voltage terminal that links to each other with said outer shroud control module of the outer shroud control module, that links to each other of ring control module, one with said in the feedback module that links to each other of ring control module and said outer shroud control module, one with the said interior earth terminal that output terminal and that control module and said feedback module link to each other links to each other with said feedback module that encircles; Ring control module and said feedback module form the fast path of a high bandwidth, low gain in said; Said outer shroud control module and said feedback module form the slow path of a high-gain, low bandwidth; Said outer shroud control module comprises first resistance that electric capacity and one that first FET, that one first operational amplifier, links to each other with said first operational amplifier links to each other with said first operational amplifier and said first FET links to each other with said first FET; The ring control module comprises second FET that one second operational amplifier and links to each other with said second operational amplifier in said, and said feedback module comprises the 4th resistance that the 3rd resistance and one that second resistance, one that links to each other with said second FET links to each other with said second resistance links to each other with said the 3rd resistance.
2. low-dropout linear voltage-regulating circuit as claimed in claim 1; It is characterized in that: an inverting input of said first operational amplifier links to each other with said reference voltage terminal, and a normal phase input end of said first operational amplifier links to each other with an end of an end of said the 3rd resistance and said the 4th resistance.
3. low-dropout linear voltage-regulating circuit as claimed in claim 2; It is characterized in that: an output terminal of said first operational amplifier links to each other with the grid of an end of said electric capacity and said first FET, and the drain electrode of said first FET links to each other with an end of said first resistance and an inverting input of said second operational amplifier.
4. low-dropout linear voltage-regulating circuit as claimed in claim 3; It is characterized in that: a normal phase input end of said second operational amplifier links to each other with the other end of an end of said second resistance and said the 3rd resistance, and an output terminal of said second operational amplifier links to each other with the grid of said second FET.
5. low-dropout linear voltage-regulating circuit as claimed in claim 4 is characterized in that: the drain electrode of said second FET is connected said output terminal jointly with the other end of said second resistance.
6. low-dropout linear voltage-regulating circuit as claimed in claim 5; It is characterized in that: common said power end, the said earth terminal of the common connection of the other end of the other end of said first resistance and said the 4th resistance of connecting of the source class of the other end of said electric capacity, said first FET and the source class of said second FET.
7. low pressure difference linearity voltage-stabilizing system; It is characterized in that: said low pressure difference linearity voltage-stabilizing system comprise interior ring control module that a power end, links to each other with said power end, one with said power end and said in the reference voltage terminal that links to each other with said outer shroud control module of the outer shroud control module, that links to each other of ring control module, one with said in the feedback module that links to each other of ring control module and said outer shroud control module, one with the said interior earth terminal that output terminal and that control module and said feedback module link to each other links to each other with said feedback module that encircles; Ring control module and said feedback module formation one is used to realize the high bandwidth of response fast, the fast path of low gain in said, and said outer shroud control module and said feedback module form one and be used to realize having the high-gain of high precision output, the slow path of low bandwidth.
8. low pressure difference linearity voltage-stabilizing system as claimed in claim 7; It is characterized in that: said outer shroud control module comprises first resistance that electric capacity and one that first FET, that one first operational amplifier, links to each other with said first operational amplifier links to each other with said first operational amplifier and said first FET links to each other with said first FET; The ring control module comprises second FET that one second operational amplifier and links to each other with said second operational amplifier in said, and said feedback module comprises the 4th resistance that the 3rd resistance and one that second resistance, one that links to each other with said second FET links to each other with said second resistance links to each other with said the 3rd resistance.
9. low pressure difference linearity voltage-stabilizing system as claimed in claim 8; It is characterized in that: an inverting input of said first operational amplifier links to each other with said reference voltage terminal; One normal phase input end of said first operational amplifier links to each other with an end of an end of said the 3rd resistance and said the 4th resistance; One output terminal of said first operational amplifier links to each other with the grid of an end of said electric capacity and said first FET, and the drain electrode of said first FET links to each other with an end of said first resistance and an inverting input of said second operational amplifier.
10. low pressure difference linearity voltage-stabilizing system as claimed in claim 9; It is characterized in that: a normal phase input end of said second operational amplifier links to each other with the other end of an end of said second resistance and said the 3rd resistance; One output terminal of said second operational amplifier links to each other with the grid of said second FET; The drain electrode of said second FET is connected said output terminal jointly with the other end of said second resistance; Common said power end, the said earth terminal of the common connection of the other end of the other end of said first resistance and said the 4th resistance of connecting of the source class of the source class of the other end of said electric capacity, said first FET and said second FET.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103990724A CN102393781A (en) | 2011-12-06 | 2011-12-06 | Low-dropout linear voltage regulator circuit and system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103990724A CN102393781A (en) | 2011-12-06 | 2011-12-06 | Low-dropout linear voltage regulator circuit and system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9684325B1 (en) | 2016-01-28 | 2017-06-20 | Qualcomm Incorporated | Low dropout voltage regulator with improved power supply rejection |
| CN107370461A (en) * | 2017-07-17 | 2017-11-21 | 电子科技大学 | A kind of collocation structure applied to trans-impedance amplifier |
| CN113703507A (en) * | 2020-05-23 | 2021-11-26 | 圣邦微电子（北京）股份有限公司 | Circuit for improving response speed of LDO (low dropout regulator) |
| CN114584088A (en) * | 2020-12-02 | 2022-06-03 | 圣邦微电子（北京）股份有限公司 | Operational amplifier, integrated circuit and internal power supply generation method of operational amplifier |
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| US7199565B1 (en) * | 2006-04-18 | 2007-04-03 | Atmel Corporation | Low-dropout voltage regulator with a voltage slew rate efficient transient response boost circuit |
| CN101261525A (en) * | 2007-03-07 | 2008-09-10 | 株式会社理光 | Voltage regulator circuit and control method therefor |
| EP2354881A1 (en) * | 2010-02-05 | 2011-08-10 | Dialog Semiconductor GmbH | Domino voltage regulator (DVR) |
| CN202331251U (en) * | 2011-12-06 | 2012-07-11 | 四川和芯微电子股份有限公司 | Low-voltage-difference linear voltage-stabilizing circuit |
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| US20030214275A1 (en) * | 2002-05-20 | 2003-11-20 | Biagi Hubert J. | Low drop-out regulator having current feedback amplifier and composite feedback loop |
| US7199565B1 (en) * | 2006-04-18 | 2007-04-03 | Atmel Corporation | Low-dropout voltage regulator with a voltage slew rate efficient transient response boost circuit |
| CN101261525A (en) * | 2007-03-07 | 2008-09-10 | 株式会社理光 | Voltage regulator circuit and control method therefor |
| EP2354881A1 (en) * | 2010-02-05 | 2011-08-10 | Dialog Semiconductor GmbH | Domino voltage regulator (DVR) |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9684325B1 (en) | 2016-01-28 | 2017-06-20 | Qualcomm Incorporated | Low dropout voltage regulator with improved power supply rejection |
| WO2017131906A1 (en) * | 2016-01-28 | 2017-08-03 | Qualcomm Incorporated | Low dropout voltage regulator with improved power supply rejection |
| KR20180105656A (en) * | 2016-01-28 | 2018-09-28 | 퀄컴 인코포레이티드 | Low dropout (LDO) voltage regulator with improved power supply rejection |
| EP3408724A1 (en) * | 2016-01-28 | 2018-12-05 | Qualcomm Incorporated | Low dropout voltage regulator with improved power supply rejection |
| KR102356564B1 (en) | 2016-01-28 | 2022-01-26 | 퀄컴 인코포레이티드 | Low dropout (LDO) voltage regulator with improved power supply rejection |
| CN107370461A (en) * | 2017-07-17 | 2017-11-21 | 电子科技大学 | A kind of collocation structure applied to trans-impedance amplifier |
| CN107370461B (en) * | 2017-07-17 | 2020-07-10 | 电子科技大学 | Compensation structure applied to transimpedance amplifier |
| CN113703507A (en) * | 2020-05-23 | 2021-11-26 | 圣邦微电子（北京）股份有限公司 | Circuit for improving response speed of LDO (low dropout regulator) |
| CN114584088A (en) * | 2020-12-02 | 2022-06-03 | 圣邦微电子（北京）股份有限公司 | Operational amplifier, integrated circuit and internal power supply generation method of operational amplifier |
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Address after: 610041 Sichuan city of Chengdu province high tech Zone Kyrgyzstan Road 33 block A No. 9 Applicant after: IPGoal Microelectronics (Sichuan) Co., Ltd. Address before: 402 room 7, building 610041, incubator Park, hi tech Zone, Sichuan, Chengdu Applicant before: IPGoal Microelectronics (Sichuan) Co., Ltd. |
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Application publication date: 20120328 |