CN104777869B - A kind of low pressure difference linear voltage regulator of the quickly response of dynamic adjustment reference voltage - Google Patents
A kind of low pressure difference linear voltage regulator of the quickly response of dynamic adjustment reference voltage Download PDFInfo
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Abstract
The present invention relates to the low pressure difference linear voltage regulator of the quickly response of a kind of dynamic adjustment reference voltage, including band-gap reference, operational amplifier, feedback resistance string and power tube, feedback resistance is connected in series to the positive input of operational amplifier, the drain terminal of one termination power tube of feedback resistance string, the other end ground connection of feedback resistance string, the source of power tube meets VDDPower supply, the outfan of the grid termination operational amplifier of power tube, also include that fixed reference potential produces circuit, threshold value comparison circuit, dynamic reference voltage generation circuit and selector, the present invention solves the technical problem that existing low pressure difference linear voltage regulator LDO power consumption is high, the present invention improves the response speed of LDO by dynamically adjusting the reference voltage of LDO, it is to avoid LDO has big pressure drop.
Description
Technical field
The present invention relates to the low pressure difference linear voltage regulator LDO of the quickly response of a kind of dynamic adjustment 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 includes resistance R1 and resistance R2；Band-gap reference produces reference voltage V ref for comparing；Feedback resistance string determines feedback factor；Operational amplifier adjusts the grid voltage of power tube 14 pipe, makes feedback voltage Vfb=Vref=Vout*R2/ (R1+R2).
So output voltage Vout=Vref* (the R1+R2)/R2 of LDO.Improve the response speed of LDO by increasing the quiescent current Iq of operational amplifier, thus reduce the pressure drop of LDO output and cross punching, and accelerate the resume speed of LDO output voltage.Although this way is it can be avoided that the output of LDO has big pressure drop and big crossing to rush；And accelerate LDO to its output pressure drop and the big response speed crossing punching；But but increase the power consumption of LDO.
Summary of the invention
The technical problem high in order to solve existing low pressure difference linear voltage regulator LDO power consumption, the present invention provides the low pressure difference linear voltage regulator LDO of the quickly response of a kind of dynamic adjustment reference voltage.
The technical solution of the present invention:
A kind of low pressure difference linear voltage regulator of the quickly response of dynamic adjustment reference voltage, including 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 VDDPower supply, the outfan of the grid termination operational amplifier of described power tube 16, it is characterized in that
Also include fixed reference potential generative circuit, threshold value comparison circuit, dynamic reference voltage generation circuit and selector,
The input of described fixed reference potential generative circuit connects the outfan of band-gap reference 10, and described fixed reference potential generative circuit is for producing fixing reference voltage level Vref0 and fixing reference voltage level Vref1；
The reference voltage level Vref0 that one input termination of described threshold value comparison circuit is fixed, the feedback voltage Vfb that another input termination feedback resistance string 17 produces, described threshold value comparison circuit produces and enables signal en1, enable signal enl to input to selector, the reference voltage level Vref1 that one input termination of described dynamic reference voltage generation circuit is fixed, 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 the input to selector, the input of described selector also meets fixing reference voltage level Vref1, described selector 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 time, threshold value comparison circuit output enable signal en1 from low to high；
Vout0 is the desired value of the stabilizer output voltage set, and Vout is manostat real output value；
When enabling signal en1 and being high, selector selects dynamic reference voltage Vref2 to export as reference voltage V ref；When enabling signal en1 and being low, selector selects fixed reference potential vref1 to export as reference voltage V ref.
Above-mentioned dynamic reference voltage generation circuit includes ADC and DAC, the output of ADC terminates fixing reference voltage level Vref1 and feedback voltage Vfb, fixing reference voltage level Vref1 and feedback voltage Vfb are compared generation numeral code by described ADC, and are sent to DAC；Described DAC converts digital signals into analogue signal dynamic reference voltage Vref2 according to numeral code value.
Above-mentioned selector includes phase inverter, switch S1 and switch S2, enable signal en1 and control the folding of switch S2, enable the signal en1 folding through inverter controlling switch S1, described switch S1 controls the output of fixing reference voltage level Vref1, and described switch S2 controls the output of dynamic reference voltage Vref2.
nullFixed reference potential generative circuit includes the second operational amplifier 111、Metal-oxide-semiconductor 112 and the second feedback resistance string 113，Described first feedback resistance string 113 includes the resistance R3 being sequentially connected in series、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 outfan 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.
It is input to the value that reference voltage V ref of amplifier 15 is the output voltage according to LDO dynamically change.
Advantage for present invention:
1, the present invention improves the response speed of LDO by dynamically adjusting the reference voltage of LDO, it is to avoid LDO has big pressure drop.
2, the power consumption of operational amplifier is not increased.In the case of the relatively low Iq of operational amplifier, LDO obtains response speed faster.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing manostat；
Fig. 2 is manostat LDO circuit structure chart of the present invention；
Fig. 3 is a kind of implementation schematic diagram of selector 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.
Detailed description of the invention
As in figure 2 it is shown, the present invention adds 20 partial circuits in face on the basis of original.20 partial circuits include a fixed reference potential generative circuit, a threshold value comparison circuit, a dynamic reference voltage generation circuit and a selector.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 VDDPower supply, the outfan of the grid termination operational amplifier of power tube 16, the input of fixed reference potential generative circuit connects the outfan of band-gap reference 10, and fixed reference potential generative circuit is for producing fixing reference voltage level Vref0 and fixing reference voltage level Vref1；The reference voltage level Vref0 that one input termination of threshold value comparison circuit is fixed, the feedback voltage Vfb that another input termination feedback resistance string 17 produces, described threshold value comparison circuit produces and enables signal en1, enable signal en1 to input to selector, the reference voltage level Vref1 that one input termination of dynamic reference voltage generation circuit is fixed, 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 the input to selector, the input of selector also meets fixing reference voltage level Vref1, selector 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 time, threshold value comparison circuit output enable signal en1 from low to high；Vout0 is the desired value of the stabilizer output voltage set, and Vout is manostat real output value；When enabling signal en1 and being high, switch S2 conducting, selector selects dynamic reference voltage Vref2 to export as reference voltage V ref；When enabling signal en1 and being low, switch S1 conducting, selector selects fixed reference potential vref1 to export as reference voltage V ref.
Threshold value comparison circuit can be realized by a comparator.Selector can realize as shown in Figure 3.Selector includes phase inverter, switch S1 and switch S2, enable signal en1 and control the folding of switch S2, enabling the signal en1 folding through inverter controlling switch S1, switch S1 controls the output of fixing reference voltage level Vref1, and described switch S2 controls the output of dynamic reference voltage Vref2.
As shown in Figure 4, fixed reference potential generative circuit includes the second operational amplifier 111, metal-oxide-semiconductor 112 and the second feedback resistance string 113, first feedback resistance string 113 includes the resistance R3 being sequentially connected in series, 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 outfan 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 includes ADC and DAC, the output of ADC terminates fixing reference voltage level Vref1 and feedback voltage Vfb, and fixing reference voltage level Vref1 and feedback voltage Vfb are compared generation numeral code by ADC, and send DAC；Described DAC converts digital signals into analogue signal dynamic reference voltage Vref2 according to numeral code value.
Fixed reference potential generative circuit generates two fixing reference voltage levels, respectively Vref0 and Vref1, Vref1 > Vref0；(Vref1-Vref0) * (R1+R2)/R2=△ V；△ V is exactly the threshold value set.The desired value assuming the output voltage of LDO is Vout0, as Vout0-Vout > △ V time, output signal e n1 of threshold comparator is from low to high；When en1 is low, selector selects fixed reference potential Vref1 as the input of operational amplifier 15；When en1 is high, selector selects dynamic reference voltage Vref2 as the input of operational amplifier 15；Dynamic reference voltage generation circuit 13 generates a dynamic reference voltage Vref 2 according to the size of input voltage vfb, and vfb is the lowest, and the reference voltage Vref 2 of generation is the biggest.
If the pressure drop ratio of output voltage Vout is relatively big, en1 just becomes high, and selector selects dynamic reference voltage Vref2 as the input of amplifier.The pressure drop of Vout is the biggest, and the input Vref2 of amplifier is the biggest, and the response speed of LDO loop is the fastest, 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 quickly response of a dynamic adjustment reference voltage, including 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 VDDPower supply, the outfan of the grid termination operational amplifier of described power tube (16), feedback resistance string (17) includes resistance R1 and the resistance R2 being sequentially connected with, it is characterised in that:
Also include fixed reference potential generative circuit, threshold value comparison circuit, dynamic reference voltage generation circuit and selector,
The input of described fixed reference potential generative circuit connects the outfan of band-gap reference (10), and described fixed reference potential generative circuit is for producing fixing reference voltage level Vref0 and fixing reference voltage level Vref1；
The reference voltage level Vref0 that one input termination of described threshold value comparison circuit is fixed, the feedback voltage Vfb that another input termination feedback resistance string (17) produces, described threshold value comparison circuit produces and enables signal en1, enable signal enl to input to selector, the reference voltage level Vref1 that one input termination of described dynamic reference voltage generation circuit is fixed, 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 the input to selector, the input of described selector also meets fixing reference voltage level Vref1, described selector 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 time, threshold value comparison circuit output enable signal en1 from low to high；
Vout0 is the desired value of the stabilizer output voltage set, and Vout is manostat real output value；
When enabling signal en1 and being high, selector selects dynamic reference voltage Vref2 to export as reference voltage V ref；When enabling signal en1 and being low, selector selects fixed reference potential vref1 to export as reference voltage V ref.
The low pressure difference linear voltage regulator of the quickly response of dynamic adjustment reference voltage the most according to claim 1, it is characterized in that: described dynamic reference voltage generation circuit includes ADC and DAC, the output of ADC terminates fixing reference voltage level Vref1 and feedback voltage Vfb, fixing reference voltage level Vref1 and feedback voltage Vfb are compared generation numeral code by described ADC, and are sent to DAC；Described DAC converts digital signals into analogue signal dynamic reference voltage Vref2 according to numeral code value.
The low pressure difference linear voltage regulator of the quickly response of dynamic adjustment reference voltage the most according to claim 1 and 2, it is characterized in that: described selector includes phase inverter, switch S1 and switch S2, enable signal en1 and control the folding of switch S2, enable the signal en1 folding through inverter controlling switch S1, described switch S1 controls the output of fixing reference voltage level Vref1, and described switch S2 controls the output of dynamic reference voltage Vref2.
nullThe low pressure difference linear voltage regulator of the quickly response of dynamic adjustment reference voltage the most according to claim 3，It is characterized in that: fixed reference potential generative circuit includes the second operational amplifier (111)、Metal-oxide-semiconductor (112) and the second feedback resistance string (113)，Described second feedback resistance string (113) includes the resistance R3 being sequentially connected in series、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 outfan 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 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 low pressure difference linear voltage regulator of the quickly response of dynamic adjustment reference voltage the most according to claim 4, it is characterised in that: it is input to the value that reference voltage V ref of operational amplifier (15) is the output voltage according to LDO and dynamically changes.
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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 |
| 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 |
| CN110320957B (en) * | 2019-08-05 | 2022-01-07 | 北京中科银河芯科技有限公司 | Voltage selection circuit |
| US11392156B2 (en) * | 2019-12-24 | 2022-07-19 | Shenzhen GOODIX Technology Co., Ltd. | Voltage generator with multiple voltage vs. temperature slope domains |
| 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 |
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| CN114879796B (en) * | 2022-06-24 | 2022-10-21 | 北京芯格诺微电子有限公司 | Digital-analog mixed low dropout linear voltage regulator capable of realizing output voltage regulation |
| CN117594000A (en) * | 2022-08-19 | 2024-02-23 | 华为技术有限公司 | Source driving chip and display device |
| 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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