CN104777869A - Quickly responded low dropout regulator capable of dynamically adjusting reference voltage - Google Patents
Quickly responded low dropout regulator capable of dynamically adjusting reference voltage Download PDFInfo
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- CN104777869A CN104777869A CN201510142141.1A CN201510142141A CN104777869A CN 104777869 A CN104777869 A CN 104777869A CN 201510142141 A CN201510142141 A CN 201510142141A CN 104777869 A CN104777869 A CN 104777869A
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Abstract
The invention relates to a quickly responded low dropout regulator capable of dynamically adjusting a reference voltage. The low dropout regulator comprises a band gap reference, an operational amplifier, a feedback resistor string and a power tube; the feedback resistor string is connected to the positive input end of the operational amplifier; one end of the feedback resistor string is connected to the drain terminal of the power tube; the other end of the feedback resistor string is connected to the ground; the source terminal of the power tube is connected to a VDD power supply; the gate terminal of the power tube is connected to the output end of the operational amplifier; the low dropout regulator further comprises a fixed reference voltage generating circuit, a threshold comparing circuit, a dynamic reference voltage generating circuit and a selector. The low dropout regulator disclosed by the invention solves the technical problem that the existing LDO (low dropout regulator) has high power consumption; through dynamical adjustment of the reference voltage of the LDO, a response speed of the LDO is increased, and a large voltage drop of the LDO is avoided.
Description
Technical field
The present invention relates to a kind of low pressure difference linear voltage regulator LDO of quick response of dynamic conditioning reference voltage.
Background technology
General LDO is made up of band-gap reference, operational amplifier, feedback resistance string and power tube 14 pipe.Feedback resistance string comprises resistance R1 and resistance R2; Band-gap reference produces the reference voltage V ref for comparing; Feedback resistance string determines feedback factor; The grid voltage of operational amplifier Modulating Power pipe 14 pipe, makes feedback voltage Vfb=Vref=Vout*R2/ (R1+R2).
So output voltage Vout=Vref* (the R1+R2)/R2 of LDO.Improved the response speed of LDO by the quiescent current Iq increasing operational amplifier, thus reduce pressure drop and the overshoot of LDO output, and accelerate the resume speed of LDO output voltage.Although this way can avoid the output of LDO to have large pressure drop and large overshoot; And accelerate LDO exports pressure drop and large overshoot response speed to it; But but increase the power consumption of LDO.
Summary of the invention
In order to solve the high technical matters of existing low pressure difference linear voltage regulator LDO power consumption, the invention provides a kind of low pressure difference linear voltage regulator LDO of quick response of dynamic conditioning reference voltage.
Technical solution of the present invention:
A kind of low pressure difference linear voltage regulator of quick response of dynamic conditioning reference voltage, comprise band-gap reference 10, operational amplifier 15, feedback resistance string 17 and power tube 16, described feedback resistance string 17 is connected to the positive input of operational amplifier 15, the drain terminal of one termination power tube 16 of described feedback resistance string 17, the other end ground connection of described feedback resistance string 17, the source of described power tube 16 meets V
dDpower supply, the output terminal of the grid termination operational amplifier of described power tube 16, its special character is:
Also comprise fixed reference potential and produce circuit, threshold value comparator circuit, dynamic reference voltage generation circuit and selector switch,
The input end of described fixed reference potential production circuit connects the output terminal of band-gap reference 10, and described fixed reference potential produces circuit for generation of fixing reference voltage level Vref0 and fixing reference voltage level Vref1;
One of described threshold value comparator circuit inputs the fixing reference voltage level Vref0 of termination, the feedback voltage Vfb that another input termination feedback resistance string 17 produces, described threshold value comparator circuit produces enable signal en1, enable signal enl inputs to selector switch, one of described dynamic reference voltage generation circuit inputs the fixing reference voltage level Vref1 of termination, the feedback voltage Vfb that another input termination feedback resistance string 17 produces, described dynamic reference voltage generation circuit produces dynamic reference voltage Vref2, and input to the input end of selector switch, the input end of described selector switch also meets fixing reference voltage level Vref1, described selector switch output reference voltage Vref is to the negative input of operational amplifier 15,
Wherein Vref1>Vref0, △ V=(Vref1-Vref0) * (R1+R2)/R2;
As Vout0-Vout> △ V, the enable signal en1 that threshold value comparator circuit exports from low to high;
Vout0 is the desired value of the stabilizer output voltage of setting, and Vout is voltage stabilizer real output value;
When enable signal en1 is high, selector switch selects dynamic reference voltage Vref2 to export as reference voltage V ref; When enable signal en1 is low, selector switch selects fixed reference potential vref1 to export as reference voltage V ref.
Above-mentioned dynamic reference voltage generation circuit comprises ADC and DAC, the reference voltage level Vref1 that the output termination of ADC is fixing and feedback voltage Vfb, fixing reference voltage level Vref1 and feedback voltage Vfb compare and produce digital code by described ADC, and send to DAC; Digital signal is converted to simulating signal dynamic reference voltage Vref2 according to digital code value by described DAC.
Above-mentioned selector switch comprises phase inverter, switch S 1 and switch S 2, the folding of enable signal en1 gauge tap S2, enable signal en1 is through the folding of inverter controlling switch S 1, described switch S 1 controls the output of fixing reference voltage level Vref1, and described switch S 2 controls the output of dynamic reference resistance Vref2.
Fixed reference potential generative circuit comprises the second operational amplifier 111, metal-oxide-semiconductor 112 and the second feedback resistance string 113, described first feedback resistance string 113 comprises the resistance R3 connected successively, resistance R4, resistance R5 and resistance R6, the drain terminal of another termination metal-oxide-semiconductor 112 of described resistance R3, the other end ground connection of described resistance R6, the negative input of described second operational amplifier 111 connects the output terminal of band-gap reference, the positive input of described second operational amplifier connects the second feedback voltage Vfb 2 of the second feedback resistance string output, the grid end of the output termination metal-oxide-semiconductor 112 of described second operational amplifier 111, fixing reference voltage level Vref1 is exported between described resistance R3 and resistance R4, described resistance R4, fixing reference voltage level Vref0 is exported between resistance R5.
The reference voltage V ref being input to amplifier 15 is the value dynamic change of output voltage according to LDO.
The advantage that the present invention has:
1, the present invention improves the response speed of LDO by the reference voltage of dynamic conditioning LDO, avoids LDO to have large pressure drop.
2, the power consumption of operational amplifier is not increased.When the lower Iq of operational amplifier, LDO obtains response speed faster.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing voltage stabilizer;
Fig. 2 is voltage stabilizer LDO circuit structure diagram of the present invention;
Fig. 3 is a kind of implementation schematic diagram of selector switch of the present invention;
Fig. 4 is a kind of implementation schematic diagram of fixed reference potential generative circuit of the present invention;
Fig. 5 is a kind of implementation schematic diagram of dynamic reference voltage generation circuit of the present invention.
Embodiment
As shown in Figure 2, the present invention adds 20 partial circuits on original basis.20 partial circuits comprise a fixed reference potential and produce circuit, threshold value comparator circuit, a dynamic reference voltage generation circuit and a selector switch.Feedback resistance string 17 is connected to the positive input of operational amplifier 15, and the drain terminal of a termination power tube 16 of described feedback resistance string 17, the other end ground connection of described feedback resistance string 17, the source of power tube 16 meets V
dDpower supply, the output terminal of the grid termination operational amplifier of power tube 16, the input end of fixed reference potential production circuit connects the output terminal of band-gap reference 10, and fixed reference potential produces circuit for generation of fixing reference voltage level Vref0 and fixing reference voltage level Vref1, one of threshold value comparator circuit inputs the fixing reference voltage level Vref0 of termination, the feedback voltage Vfb that another input termination feedback resistance string 17 produces, described threshold value comparator circuit produces enable signal en1, enable signal en1 inputs to selector switch, one of dynamic reference voltage generation circuit inputs the fixing reference voltage level Vref1 of termination, the feedback voltage Vfb that another input termination feedback resistance string 17 produces, dynamic reference voltage generation circuit produces dynamic reference voltage Vref2, and input to the input end of selector switch, the input end of selector switch also meets fixing reference voltage level Vref1, selector switch output reference voltage Vref is to the negative input of operational amplifier 15, wherein Vref1>Vref0, △ V=(Vref1-Vref0) * (R1+R2)/R2, as Vout0-Vout> △ V, the enable signal en1 that threshold value comparator circuit exports from low to high, Vout0 is the desired value of the stabilizer output voltage of setting, and Vout is voltage stabilizer real output value, when enable signal en1 is high, switch S 2 conducting, selector switch selects dynamic reference voltage Vref2 to export as reference voltage V ref, when enable signal en1 is low, switch S 1 conducting, selector switch selects fixed reference potential vref1 to export as reference voltage V ref.
Threshold value comparator circuit can be realized by a comparer.Selector switch can realize as shown in Figure 3.Selector switch comprises phase inverter, switch S 1 and switch S 2, the folding of enable signal en1 gauge tap S2, enable signal en1 is through the folding of inverter controlling switch S 1, and switch S 1 controls the output of fixing reference voltage level Vref1, and described switch S 2 controls the output of dynamic reference resistance Vref2.
As shown in Figure 4, fixed reference potential generative circuit comprises the second operational amplifier 111, metal-oxide-semiconductor 112 and the second feedback resistance string 113, first feedback resistance string 113 comprises the resistance R3 connected successively, resistance R4, resistance R5 and resistance R6, the drain terminal of another termination metal-oxide-semiconductor 112 of resistance R3, the other end ground connection of resistance R6, the negative input of the second operational amplifier 111 connects the output terminal of band-gap reference, the positive input of the second operational amplifier connects the second feedback voltage Vfb 2 of the second feedback resistance string output, the grid end of the output termination metal-oxide-semiconductor 112 of the second operational amplifier 111, fixing reference voltage level Vref1 is exported between resistance R3 and resistance R4, resistance R4, fixing reference voltage level Vref0 is exported between resistance R5.The second feedback voltage Vfb 2 is exported between resistance R5 and resistance R6.
As shown in Figure 5, dynamic reference voltage generation circuit comprises ADC and DAC, the reference voltage level Vref1 that the output termination of ADC is fixing and feedback voltage Vfb, fixing reference voltage level Vref1 and feedback voltage Vfb compare and produce digital code by ADC, and send DAC; Digital signal is converted to simulating signal dynamic reference voltage Vref2 according to digital code value by described DAC.
Fixed reference potential generative circuit generates two fixing reference voltage levels, is respectively Vref0 and Vref1, Vref1>Vref0; (Vref1-Vref0) * (R1+R2)/R2=△ V; △ V is exactly the threshold value of setting.Suppose that the desired value of the output voltage of LDO is Vout0, as Vout0-Vout> △ V, the output signal e n1 of threshold comparator from low to high; When en1 is low, selector switch selects fixed reference potential Vref1 as the input of operational amplifier 15; When en1 is high, selector switch selects dynamic reference voltage Vref2 as the input of operational amplifier 15; It is lower that dynamic reference voltage generation circuit 13 generates a dynamic reference voltage Vref 2, vfb according to the size of input voltage vfb, and the reference voltage Vref 2 of generation is larger.
If the pressure drop ratio of output voltage Vout is comparatively large, en1 just becomes height, and selector switch selects dynamic reference voltage Vref2 as the input of amplifier.The pressure drop of Vout is larger, and the input Vref2 of amplifier is larger, and the response speed of LDO loop is faster, thus reduces the output pressure drop of LDO, and accelerates the response speed of LDO.
Claims (5)
1. the low pressure difference linear voltage regulator of the quick response of a dynamic conditioning reference voltage, comprise band-gap reference (10), operational amplifier (15), feedback resistance string (17) and power tube (16), described feedback resistance string (17) is connected to the positive input of operational amplifier (15), the drain terminal of one termination power tube (16) of described feedback resistance string (17), the other end ground connection of described feedback resistance string (17), the source of described power tube (16) meets V
dDpower supply, the output terminal of the grid termination operational amplifier of described power tube (16), is characterized in that:
Also comprise fixed reference potential and produce circuit, threshold value comparator circuit, dynamic reference voltage generation circuit and selector switch,
The input end of described fixed reference potential production circuit connects the output terminal of band-gap reference (10), and described fixed reference potential produces circuit for generation of fixing reference voltage level Vref0 and fixing reference voltage level Vref1;
One of described threshold value comparator circuit inputs the fixing reference voltage level Vref0 of termination, the feedback voltage Vfb that another input termination feedback resistance string (17) produces, described threshold value comparator circuit produces enable signal en1, enable signal enl inputs to selector switch, one of described dynamic reference voltage generation circuit inputs the fixing reference voltage level Vref1 of termination, the feedback voltage Vfb that another input termination feedback resistance string (17) produces, described dynamic reference voltage generation circuit produces dynamic reference voltage Vref2, and input to the input end of selector switch, the input end of described selector switch also meets fixing reference voltage level Vref1, described selector switch output reference voltage Vref is to the negative input of operational amplifier (15),
Wherein Vref1>Vref0, △ V=(Vref1-Vref0) * (R1+R2)/R2;
As Vout0-Vout> △ V, the enable signal en1 that threshold value comparator circuit exports from low to high;
Vout0 is the desired value of the stabilizer output voltage of setting, and Vout is voltage stabilizer real output value;
When enable signal en1 is high, selector switch selects dynamic reference voltage Vref2 to export as reference voltage V ref; When enable signal en1 is low, selector switch selects fixed reference potential vref1 to export as reference voltage V ref.
2. the low pressure difference linear voltage regulator of the quick response of dynamic conditioning reference voltage according to claim 1, it is characterized in that: described dynamic reference voltage generation circuit comprises ADC and DAC, the reference voltage level Vref1 that the output termination of ADC is fixing and feedback voltage Vfb, fixing reference voltage level Vref1 and feedback voltage Vfb compare and produce digital code by described ADC, and send to DAC; Digital signal is converted to simulating signal dynamic reference voltage Vref2 according to digital code value by described DAC.
3. the low pressure difference linear voltage regulator of the quick response of dynamic conditioning reference voltage according to claim 1 and 2, it is characterized in that: described selector switch comprises phase inverter, switch S 1 and switch S 2, the folding of enable signal en1 gauge tap S2, enable signal en1 is through the folding of inverter controlling switch S 1, described switch S 1 controls the output of fixing reference voltage level Vref1, and described switch S 2 controls the output of dynamic reference resistance Vref2.
4. the low pressure difference linear voltage regulator of the quick response of dynamic conditioning reference voltage according to claim 3, it is characterized in that: fixed reference potential generative circuit comprises the second operational amplifier (111), metal-oxide-semiconductor (112) and the second feedback resistance string (113), described second feedback resistance string (113) comprises the resistance R3 connected successively, resistance R4, resistance R5 and resistance R6, the drain terminal of another termination metal-oxide-semiconductor (112) of described resistance R3, the other end ground connection of described resistance R6, the negative input of described second operational amplifier (111) connects the output terminal of band-gap reference, the positive input of described second operational amplifier connects the second feedback voltage Vfb 2 of the second feedback resistance string output, the grid end of the output termination metal-oxide-semiconductor (112) of described second operational amplifier (111), fixing reference voltage level Vref1 is exported between described resistance R3 and resistance R4, described resistance R4, fixing reference voltage level Vref0 is exported between resistance R5.
5. the low pressure difference linear voltage regulator of the quick response of dynamic conditioning reference voltage according to claim 4, is characterized in that: the reference voltage V ref being input to operational amplifier (15) is the value dynamic change of output voltage according to LDO.
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| CN110320957A (en) * | 2019-08-05 | 2019-10-11 | 北京中科银河芯科技有限公司 | A kind of voltage selecting circuit |
| WO2021129210A1 (en) | 2019-12-24 | 2021-07-01 | Shenzhen GOODIX Technology Co., Ltd. | Voltage generator with multiple voltage vs. temperature slope domains |
| CN114285152A (en) * | 2021-12-27 | 2022-04-05 | 杭州万高科技股份有限公司 | Chip power supply switching circuit with multiple power supplies for power supply |
| US11340642B2 (en) | 2020-06-24 | 2022-05-24 | Nanya Technology Corporation | Low dropout regulator and control method thereof for maintaining output voltage value of low dropout regulator |
| CN115454191A (en) * | 2022-10-08 | 2022-12-09 | 武汉杰开科技有限公司 | Overshoot protection circuit, method and chip |
| WO2023246269A1 (en) * | 2022-06-24 | 2023-12-28 | 北京芯格诺微电子有限公司 | Digital-analog hybrid low dropout regulator capable of realizing output voltage regulation |
| WO2024037462A1 (en) * | 2022-08-19 | 2024-02-22 | 华为技术有限公司 | Source driver chip and display apparatus |
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| CN107102667A (en) * | 2016-02-22 | 2017-08-29 | 联发科技（新加坡）私人有限公司 | Low pressure difference linear voltage regulator |
| CN107797442A (en) * | 2017-11-08 | 2018-03-13 | 安凯(广州)微电子技术有限公司 | Time-to-digital conversion apparatus and digital phase-locked loop |
| CN107797442B (en) * | 2017-11-08 | 2023-06-23 | 广州安凯微电子股份有限公司 | Time-to-digital conversion device and digital phase-locked loop |
| CN110320957A (en) * | 2019-08-05 | 2019-10-11 | 北京中科银河芯科技有限公司 | A kind of voltage selecting circuit |
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| CN114041098A (en) * | 2019-12-24 | 2022-02-11 | 深圳市汇顶科技股份有限公司 | Multiple voltage generator and temperature slope domain |
| WO2021129210A1 (en) | 2019-12-24 | 2021-07-01 | Shenzhen GOODIX Technology Co., Ltd. | Voltage generator with multiple voltage vs. temperature slope domains |
| CN114041098B (en) * | 2019-12-24 | 2024-05-28 | 深圳市汇顶科技股份有限公司 | Multi-voltage generator and temperature slope domain |
| US11340642B2 (en) | 2020-06-24 | 2022-05-24 | Nanya Technology Corporation | Low dropout regulator and control method thereof for maintaining output voltage value of low dropout regulator |
| TWI779372B (en) * | 2020-06-24 | 2022-10-01 | 南亞科技股份有限公司 | Low dropout regulator and control method thereof |
| WO2022252714A1 (en) * | 2021-12-27 | 2022-12-08 | 杭州万高科技股份有限公司 | Multi-power-supply chip power supply switching circuit |
| CN114285152A (en) * | 2021-12-27 | 2022-04-05 | 杭州万高科技股份有限公司 | Chip power supply switching circuit with multiple power supplies for power supply |
| CN114285152B (en) * | 2021-12-27 | 2023-05-16 | 杭州万高科技股份有限公司 | Multi-power-supply chip power supply switching circuit |
| WO2023246269A1 (en) * | 2022-06-24 | 2023-12-28 | 北京芯格诺微电子有限公司 | Digital-analog hybrid low dropout regulator capable of realizing output voltage regulation |
| WO2024037462A1 (en) * | 2022-08-19 | 2024-02-22 | 华为技术有限公司 | Source driver chip and display apparatus |
| CN115454191A (en) * | 2022-10-08 | 2022-12-09 | 武汉杰开科技有限公司 | Overshoot protection circuit, method and chip |
| CN115454191B (en) * | 2022-10-08 | 2023-09-29 | 武汉杰开科技有限公司 | Overshoot protection circuit, method and chip |
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