CN108646835A - A kind of low differential voltage linear voltage stabilizer circuit and power supply - Google Patents
A kind of low differential voltage linear voltage stabilizer circuit and power supply Download PDFInfo
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- CN108646835A CN108646835A CN201810553012.5A CN201810553012A CN108646835A CN 108646835 A CN108646835 A CN 108646835A CN 201810553012 A CN201810553012 A CN 201810553012A CN 108646835 A CN108646835 A CN 108646835A
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- voltage
- resistor
- linear voltage
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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
Abstract
The invention discloses a kind of low differential voltage linear voltage stabilizer circuits, include mainly the feedback network of error amplifier, voltage-reg-ulator tube, first resistor and second resistance composition and the differentiator of the first capacitance, 3rd resistor and operational amplifier composition；Wherein, differentiator is inserted into above-mentioned feedback network loop.Compared to the low pressure difference linear voltage regulator of conventional belt shunt capacitance, the invention discloses low differential voltage linear voltage stabilizer circuit can ensure to substantially reduce the size of shunt capacitance while low pressure difference linear voltage regulator heavy load range transient response ability, gone to make shunt capacitance be desirably integrated into chip interior.
Description
Technical field
The present invention relates to integrated circuit fields, and in particular to a kind of low differential voltage linear voltage stabilizer circuit and power supply.
Background technology
Low differential voltage linear voltage stabilizer circuit is widely used in various chip designs and electronic system design, it has
Lower leakage voltage (pressure difference output and input) compares other kinds of regulator circuit, its voltage conversion efficiency is higher,
Thus there is higher efficiency of energy utilization.In ideal conditions, low differential voltage linear voltage stabilizer circuit can export adjustable
Or fixed output voltage, the output voltage not at any time and temperature change, and are not influenced by circuit and load variation.So
And in actual conditions, low differential voltage linear voltage stabilizer circuit can only keep relative stability in definitely loading range, when load is unexpected
Electric current increases, and due to the limitation of limited loop bandwidth itself, output voltage can decline low pressure difference linear voltage regulator therewith suddenly, it
Afterwards since under the negative feedback of low pressure difference linear voltage regulator loop, the output voltage of low pressure difference linear voltage regulator is certain
Again it can restore original size, the energy that this output voltage of low pressure difference linear voltage regulator restores with load transient variation in time
Power, commonly referred to as transient response.Conventional low difference linear constant voltage regulator generally links a bypass circuit to improve in output end
When transient response, special loading range are bigger, shunt capacitance is also bigger (uF grades), this, which results in shunt capacitance, can not be integrated into core
Disadvantage inside piece.
Occur many solutions in the prior art to solve the above problems, most mainstream is exactly to increase a quick response
Loop improves transient response, and to connect shunt capacitance in output, traditional band exports the low voltage difference line of shunt capacitance
Property voltage-stablizer is as shown in Fig. 1, it includes mainly：Error amplifier EA, adjustment transistor PM0, resistance R1 and R2 composition it is anti-
Present network, output shunt capacitance Co, load RL；The reverse input end of the error amplifier EA and voltage reference signal VREF phases
Even, the output end of the error amplifier EA is connected with the grid of the adjustment transistor PMOS, the adjustment transistor
The source electrode of PMOS meets high level VDD, and the drain electrode of the adjustment transistor PMOS is connected with one end of resistance R1, the resistance R1
The other end, resistance R2 one end be connected with the positive input of error amplifier EA, the other end of resistance R2 ground connection；
Wherein, input signals of the voltage reference signal VREF as low pressure difference linear voltage regulator, the drain electrode of the adjustment transistor PMOS
The one end being connected with resistance R1 is as low pressure difference linear voltage regulator output end vo ut.Input terminal VREF is generally from band-gap reference
The precision voltage reference that circuit generates, low pressure difference linear voltage regulator are made by the negative-feedback of the error amplifier EA of high-gain
With so that the forward and reverse input terminal voltage of error amplifier EA is equal, i.e. VREF=Vx, Vbg export for band-gap reference, and Vx is
The feedback point voltage of resistance-feedback network, and Vx=(R2/R1+R2) * Vout, so having：Vout=(1+R1/R2) * VREF.But
It is that low pressure difference linear voltage regulator in Fig. 1 may be only available for relatively small load variation range
Invention content
It is an object of the invention to overcome defect existing in the prior art, a kind of low differential voltage linear voltage stabilizer circuit is provided
And power supply, it can ensure to substantially reduce shunt capacitance while low pressure difference linear voltage regulator heavy load range transient response ability
Size is gone to make shunt capacitance be desirably integrated into chip interior.
To solve the above-mentioned problems, technical solution of the present invention provides a kind of low differential voltage linear voltage stabilizer circuit, including：Feedback
Lattice network and load resistance, the feedback network circuit include error amplifier, voltage-reg-ulator tube, first resistor, the second electricity
Resistance and differential circuit, the reverse input end of the error amplifier are connected with voltage reference signal VREF, the error amplification
The output end of device is connected with the grid of the voltage-reg-ulator tube, and the source electrode of the voltage-reg-ulator tube connects high level VDD, the electricity
The drain electrode of pressure adjustment pipe is connected with one end of the first resistor, the other end of the first resistor and the second resistance
One end is connected, the other end ground connection of the second resistance.
Further, the differential circuit includes the first capacitance, 3rd resistor and operational amplifier.First capacitance
The draining of one end and the voltage-reg-ulator tube, one end of the first resistor is connected, the other end of first capacitance and institute
The reverse input end of one end, the operational amplifier for stating 3rd resistor is connected, the output end of the operational amplifier and institute
The other end of the positive input, the 3rd resistor of stating error amplifier is connected, the positive input of the operational amplifier
End is connected with one end of the other end of the first resistor, the second resistance.
Further, the precision voltage reference that the VREF is generated from band-gap reference circuit.
Further, the voltage-reg-ulator tube is PMOS transistor.
On the other hand, technical solution of the present invention provides a kind of power supply, including above-mentioned low differential voltage linear voltage stabilizer circuit.
Compared with prior art, the present invention has the following advantages：
The embodiment of the present invention is inserted into differentiator in feedback network loop, can ensure low pressure difference linear voltage regulator heavy load
The size that shunt capacitance is substantially reduced while range transient response ability, to make shunt capacitance be desirably integrated into chip interior
It goes.
Description of the drawings
Fig. 1 is the low dropout linear regulator structure figure that traditional band exports shunt capacitance；
Fig. 2 is low dropout linear regulator structure figure provided in an embodiment of the present invention.
Specific implementation mode
With reference to the accompanying drawings and examples, the specific implementation mode of the present invention is further described.Following embodiment is only
For clearly illustrating technical scheme of the present invention, and not intended to limit the protection scope of the present invention.
As shown in Fig. 2, the low pressure difference linear voltage regulator of the present invention includes mainly：Error amplifier EA, adjustment transistor
The differentiator of PMOS, the feedback network of resistance R1 and R2 composition and capacitance Co, resistance Rd and operational amplifier OP compositions.Institute
The reverse input end for stating error amplifier EA is connected with voltage reference signal VREF, the output end of the error amplifier EA and institute
The grid for stating adjustment transistor PMOS is connected, and the source electrode of the adjustment transistor PMOS connects high level VDD, the adjustment crystal
The drain electrode of pipe PMOS is connected with one end of one end of the resistance R1, the capacitance Co, the other end of the capacitance Co and institute
The reverse input end of one end, the operational amplifier for stating resistance Rd is connected, the output end of the operational amplifier OP and institute
The other end of the positive input, the resistance Rd of stating error amplifier EA is connected, the positive input of operational amplifier OP
It is connected with one end of the other end of the resistance R1, the resistance R2, the other end ground connection of the resistance R2.Wherein, voltage
Input signals of the reference signal VREF as low pressure difference linear voltage regulator, the drain electrode of the adjustment transistor PMOS and resistance R1,
One end that capacitance Co is connected is as low pressure difference linear voltage regulator output end vo ut, the positive input voltage of error amplifier EA
For Vx, the voltage between resistance R1 and resistance R2 is VFB.Input terminal VREF is generally from the high-precision of band-gap reference circuit generation
Reference voltage, RL are load.
The effect of the differentiator of capacitance Co, resistance Rd and operational amplifier OP compositions is analyzed below.From differential
From the point of view of the DC channel of device, capacitance Co may be considered open circuit, and at this moment resistance Rd is by the output end of operational amplifier OP and anti-
It links together to input terminal, forms unitary DC negative-feedback, therefore the positive input voltage VFB etc. of operational amplifier OP
In its output voltage Vx, and the negative feedback of entire low pressure difference linear voltage regulator loop makes Vx=VREF, therefore VFB=
VREF can export stable output voltage as conventional low difference linear constant voltage regulator：
Vout=(1+R1/R2) * Vx=(1+R1/R2) * VREF.
It is inserted into influence of the low pressure difference linear voltage regulator feedback control loop to its transient response in order to illustrate differentiator, now to micro-
Divide the carry out frequency-domain analysis of device and low pressure difference linear voltage regulator.For differentiator, operational amplifier OP positive input voltages：
Vp1=VFB=R2/ (R1+R2) * Vout,
The positive negative input void of operational amplifier OP is short, thus has：
Vn1=Vp1=VFB=R2/ (R1+R2) * Vout.
Had according to Kirchhoff's current law (KCL)：
(Vout-Vn1) * SCo=(Vn1-Vx)/RD,
It can further obtain：
Vx=RD*R1*SCo/ (R1+R2) * Vout-R2/ (R1+R2) * Vout；
Wherein R2/ (R1+R2) * Vout are DC terms, and RD*R1*SCo/ (R1+R2) * Vout are exchange related with frequency
.
Entire low pressure difference linear voltage regulator loop is referred now to, if low pressure difference linear voltage regulator exports Vout changes deltas
Vout；By the effect of differentiator, the positive input Vp0 changing values of error amplifier are：
Δ Vx=RD*R1*Co/ (R1+R2) * Δs Vout；
Assuming that the gain of error amplifier is A0, the mutual conductance of adjustment pipe PMOS is GM, then low pressure difference linear voltage regulator is defeated
The current variation value of outlet is：
Δ iout=Δs Vx*A0*GM=RD*R1*Co/ (R1+R2) * A0*GM* Δs Vout；
The admittance of low pressure difference linear voltage regulator output end：
Yout=Δ iout/ Δs vout=S*RD*R1/ (R1+R2) * A0*GM*SCo+1/ (R1+R2)；
And traditional low pressure difference linear voltage regulator output admittance is SCo+1/ (R1+R2)；
It can be seen that the low pressure difference linear voltage regulator output admittance item related with capacitance of the present invention increases RD*R1/ (R1
+ R2) * A0*GM times, therefore realize that same equivalent capacitance value, the present invention only need conventional low difference linear constant voltage regulator [1/ (RD*
A0*GM the)] area of * (1+R2/R1), [1/ (RD*A0*GM)] * (1+R2/R1) can easily accomplish 0.01 hereinafter, to
So that Co is desirably integrated into chip interior.
Compared to the low pressure difference linear voltage regulator of conventional belt shunt capacitance, shunt capacitance can be integrated into chip by the present invention
Inside reduces product size, reduces cost, compared with the low pressure difference linear voltage regulator without shunt capacitance, and the present invention has suitable
The advantages of loading range bigger.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of low differential voltage linear voltage stabilizer circuit, which is characterized in that the circuit includes feedback network circuit and load resistance,
The feedback network circuit includes error amplifier, voltage-reg-ulator tube, first resistor, second resistance and differential circuit, described
The reverse input end of error amplifier is connected with voltage reference signal VREF, the output end of the error amplifier and the voltage
The grid of adjustment pipe is connected, and the source electrode of the voltage-reg-ulator tube meets high level VDD, the drain electrode of the voltage-reg-ulator tube with it is described
One end of first resistor is connected, and the other end of the first resistor is connected with one end of the second resistance, and described second
The other end of resistance is grounded.
2. low differential voltage linear voltage stabilizer circuit as described in claim 1, which is characterized in that the differential circuit includes first
Capacitance, 3rd resistor and operational amplifier.
3. low differential voltage linear voltage stabilizer circuit as claimed in claim 2, which is characterized in that one end of first capacitance and institute
State that the draining of voltage-reg-ulator tube, one end of the first resistor is connected, the other end and the third electricity of first capacitance
One end of resistance, the operational amplifier reverse input end be connected, the output end of the operational amplifier is put with the error
The big positive input of device, the other end of the 3rd resistor are connected, the positive input of the operational amplifier with it is described
The other end of first resistor, the second resistance one end be connected.
4. low differential voltage linear voltage stabilizer circuit as claimed in claim 3, which is characterized in that the VREF is from band-gap reference electricity
The precision voltage reference that road generates.
5. low differential voltage linear voltage stabilizer circuit as claimed in claim 3, which is characterized in that the voltage-reg-ulator tube is PMOS brilliant
Body pipe.
6. a kind of power supply, which is characterized in that including low differential voltage linear voltage stabilizer circuit as described in any one in claim 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810553012.5A CN108646835B (en) | 2018-05-31 | 2018-05-31 | Low dropout regulator circuit and power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810553012.5A CN108646835B (en) | 2018-05-31 | 2018-05-31 | Low dropout regulator circuit and power supply |
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| Publication Number | Publication Date |
|---|---|
| CN108646835A true CN108646835A (en) | 2018-10-12 |
| CN108646835B CN108646835B (en) | 2020-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112994221A (en) * | 2021-05-21 | 2021-06-18 | 北京芯愿景软件技术股份有限公司 | Chip and electronic equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002032133A (en) * | 2000-05-12 | 2002-01-31 | Torex Device Co Ltd | Regulated power supply circuit |
| US20110101936A1 (en) * | 2008-06-26 | 2011-05-05 | Nxp B.V. | Low dropout voltage regulator and method of stabilising a linear regulator |
| 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 |
| CN107450643A (en) * | 2016-06-01 | 2017-12-08 | 电信科学技术研究院 | A kind of low pressure difference linear voltage regulator |
-
2018
- 2018-05-31 CN CN201810553012.5A patent/CN108646835B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002032133A (en) * | 2000-05-12 | 2002-01-31 | Torex Device Co Ltd | Regulated power supply circuit |
| US20110101936A1 (en) * | 2008-06-26 | 2011-05-05 | Nxp B.V. | Low dropout voltage regulator and method of stabilising a linear regulator |
| 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 |
| CN107450643A (en) * | 2016-06-01 | 2017-12-08 | 电信科学技术研究院 | A kind of low pressure difference linear voltage regulator |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112994221A (en) * | 2021-05-21 | 2021-06-18 | 北京芯愿景软件技术股份有限公司 | Chip and electronic equipment |
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| CN108646835B (en) | 2020-10-20 |
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