CN108776503A - A kind of linear voltage regulator of adjustable reference voltage - Google Patents
A kind of linear voltage regulator of adjustable reference voltage Download PDFInfo
- Publication number
- CN108776503A CN108776503A CN201810675094.0A CN201810675094A CN108776503A CN 108776503 A CN108776503 A CN 108776503A CN 201810675094 A CN201810675094 A CN 201810675094A CN 108776503 A CN108776503 A CN 108776503A
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- China
- Prior art keywords
- resistance
- voltage
- operational amplifier
- nmos tube
- switch series
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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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
The invention discloses a kind of linear voltage regulator of adjustable reference voltage, the 3 control word S inputted by control unit<2:0>Change into 8 control signal ctr1~ctr8, control cut-offfing for eight NMOS tube M1~M8 in switch series, to adjust the number of eight resistance R1~R8 accesses in the resistance string, to which the voltage of external voltage source input is exported desired voltage value after overregulating；The voltage for realizing voltage-stablizer is adjustable, can be suitable for more occasions.
Description
Technical field
The invention belongs to technical field of integrated circuits, and in particular to a kind of linear voltage regulator of adjustable reference voltage.
Background technology
Optical frequency sensor is widely used in portable finger tip formula BOLD contrast since its is of low cost, so blood oxygen is also made to examine
Chip is surveyed, it is to realize that blood oxygen concentration detects instead of traditional high-resolution analog-digital converter by quantifying the pulse period.
Photodiode and being sheltered from by metal covering for identical size usually can not be received illumination by traditional optical frequency sensing chip
Shade diode integrate, to generate the photoelectric current insensitive to leakage current, principle is will to normally receive the light of illumination
The photoelectric current that electric diode generates subtracts the leakage current of shade diode generation, has thus obtained the photoelectricity that only illumination generates
Stream.However this method have the shortcomings that it is two big, when leakage current eliminate ability be strongly depend on two photodiodes it
Between matching, second is that wherein shade diode is significant increases the chip gross area.So in order to reduce chip area, usually adopt
Zero offset single photodiodes scheme is taken to generate a very small photoelectric current of leakage current.It can be in very wide temperature range
The interior linear dynamic range that can be obtained more than 100dB.But sensor output frequency needs quickly to establish to track luminous intensity
Variation.
In order to solve the above-mentioned technical problem, the present inventor devises a kind of blood oxygen detection chip of quick light intensity ability of tracking
(separately applying), still, the working foundation of the blood oxygen detection chip are to need an accurately adjustable reference voltage Vref；This
Sample, integrator integrate photoelectric current iph, obtain a voltage signal linear with photoelectric current size, pulse generator
This voltage signal is converted into frequency signal, finally passes through output buffer to waveform shaping, obtains final and light intensity magnitude
Linear output frequency signal Freq.
And to cannot achieve voltage adjustable for voltage-stablizer in the prior art；Therefore field technology personnel are badly in need of designing a kind of adjustable ginseng
The linear voltage regulator for examining voltage, to meet current use needs.
Invention content
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, the present invention
Main purpose is to provide a kind of linear voltage regulator of adjustable reference voltage, it is intended to which solving voltage-stablizer in the prior art can not be real
The problem that existing voltage is adjustable.
The purpose of the present invention is what is be achieved through the following technical solutions：
A kind of linear voltage regulator of adjustable reference voltage, including an operational amplifier OP；The operational amplifier OP's
In-phase input end is connected in parallel to resistance R9 and resistance R10；The resistance R10 ground connection；The resistance R9 and external voltage source
Connection, the voltage that external voltage source generates are input to the operational amplifier OP from resistance R9；The operational amplifier OP's
Inverting input is grounded by capacitance C；The amplifier output end of the operational amplifier OP is connected with by eight electricity of resistance R1~R8
Switch series made of hindering resistance string made of being sequentially connected in series and being sequentially connected in series by eight NMOS tubes of NMOS tube M1~M8；The resistance
String is connected in parallel with the switch series；It is connected with control unit in the switch series；3 control words of described control unit input
S<2:0>8 control signal ctr1~ctr8 are changed into, cut-offfing for eight in the switch series NMOS tube M1~M8 is controlled, to
The number of eight resistance R1~R8 accesses in the resistance string is adjusted, the voltage to input external voltage source is through overregulating
Desired voltage value is exported afterwards.
Further, control signal ctr1~ctr8 of described control unit output and eight NMOS tubes in the switch series
M1~M8 is corresponded.
Further, the resistance value of eight resistance R1~R8 in the resistance string can be identical, can not also be identical；Resistance
R1 is connect with the amplifier output end of the operational amplifier OP, resistance R8 ground connection；The NMOS tube M1 and operational amplifier OP's
Amplifier output end connects；NMOS tube M8 is grounded by the capacitance C.
Compared with prior art, the present invention has at least the following advantages：
The linear voltage regulator of the adjustable reference voltage of the present invention, the 3 control word S inputted by control unit<2:0>Turn
At 8 control signal ctr1~ctr8, cut-offfing for eight NMOS tube M1~M8 in switch series is controlled, to adjust the resistance
The number of eight resistance R1~R8 accesses in string, it is desired to export the voltage of external voltage source input after overregulating
Voltage value；The voltage for realizing voltage-stablizer is adjustable, can be suitable for more occasions.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the circuit diagram of the linear voltage regulator of the adjustable reference voltage of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.
Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without creative efforts
The every other embodiment obtained, shall fall within the protection scope of the present invention.
It is to be appreciated that the directional instruction (such as up, down, left, right, before and after ...) of institute is only used in the embodiment of the present invention
In explaining relative position relation, motion conditions etc. under a certain particular pose (as shown in the picture) between each component, if should
When particular pose changes, then directionality instruction also correspondingly changes correspondingly.
The description for being such as related to " first ", " second " in the present invention is used for description purposes only, and should not be understood as indicating
Or it implies its relative importance or implicitly indicates the quantity of indicated technical characteristic." first ", " second " are defined as a result,
Feature can explicitly or implicitly include at least one of the features.
In the description of the present invention, the meaning of " plurality " is at least two, such as two, three etc., unless otherwise clear
It is specific to limit.
In the present invention unless specifically defined or limited otherwise, term " connection ", " fixation " etc. shall be understood in a broad sense,
For example, " fixation " may be a fixed connection, it may be a detachable connection, or integral；It can be mechanical connection, can also be
Electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary the connection inside two elements or two
The interaction relationship of a element, unless otherwise restricted clearly.It for the ordinary skill in the art, can basis
Concrete condition understands the concrete meaning of above-mentioned term in the present invention.
In addition, the technical solution between each embodiment of the present invention can be combined with each other, but must be general with this field
Logical technical staff can be implemented as basis, will be understood that when the combination of technical solution appearance is conflicting or cannot achieve this
The combination of technical solution is not present, also not the present invention claims protection domain within.
A kind of linear voltage regulator of adjustable reference voltage, including an operational amplifier OP；The operational amplifier OP's
In-phase input end is connected in parallel to resistance R9 and resistance R10；The resistance R10 ground connection；The resistance R9 and external voltage source
Connection, the voltage that external voltage source generates are input to the operational amplifier OP from resistance R9；The operational amplifier OP's
Inverting input is grounded by capacitance C；The amplifier output end of the operational amplifier OP is connected with by eight electricity of resistance R1~R8
Switch series made of hindering resistance string made of being sequentially connected in series and being sequentially connected in series by eight NMOS tubes of NMOS tube M1~M8；The resistance
String is connected in parallel with the switch series；It is connected with control unit in the switch series；3 control words of described control unit input
S<2:0>8 control signal ctr1~ctr8 are changed into, cut-offfing for eight in the switch series NMOS tube M1~M8 is controlled, to
The number of eight resistance R1~R8 accesses in the resistance string is adjusted, the voltage to input external voltage source is through overregulating
Desired voltage value is exported afterwards；The voltage for realizing voltage-stablizer is adjustable, can be suitable for more occasions.
It illustrates, it is assumed that ctr1~ctr7 is 0, ctr8 1, then M1~M7 is disconnected, M8 conductings, approximation can be with
Think that voltage V8 is equal to 8V- equal to V- then the voltage of Vref can be expressed as formula (1).
Because of the short principle of void according to amplifier, V+ is equal to V-,
V+=Vbgr × R10/ (R9+R10) formula (2)
The Vref value with Vbgr linearly is can be obtained by by formula (2) in this way.
Wherein, the control signal ctr1~ctr8 and eight NMOS tube M1 in the switch series of described control unit output
~M8 is corresponded.
Wherein, the resistance value of eight resistance R1~R8 in the resistance string can be identical, can not also be identical；Resistance R1
It is connect with the amplifier output end of the operational amplifier OP, resistance R8 ground connection；The fortune of NMOS tube M1 and the operational amplifier OP
Put output end connection；NMOS tube M8 is grounded by the capacitance C.
More than, it is merely preferred embodiments of the present invention, but the protection domain invented is not limited thereto, it is any ripe
Know those skilled in the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in should all be contained
Lid is within protection scope of the present invention.Therefore, the scope of protection of the invention shall be subject to the scope of protection specified in the patent claim.
Claims (3)
1. a kind of linear voltage regulator of adjustable reference voltage, which is characterized in that including an operational amplifier OP；The operation is put
The in-phase input end of big device OP is connected in parallel to resistance R9 and resistance R10；The resistance R10 ground connection；The resistance R9 and outside
Voltage source connection, external voltage source generate voltage be input to the operational amplifier OP from resistance R9；The operation is put
The inverting input of big device OP is grounded by capacitance C；The amplifier output end of the operational amplifier OP be connected with by resistance R1~
Resistance string made of eight resistance of R8 are sequentially connected in series and switch series made of being sequentially connected in series by eight NMOS tubes of NMOS tube M1~M8；
The resistance string is connected in parallel with the switch series；It is connected with control unit in the switch series；The 3 of described control unit input
Position control word S<2:0>8 control signal ctr1~ctr8 are changed into, control eight NMOS tube M1~M8's in the switch series
It cut-offs, to adjust the number of eight resistance R1~R8 accesses in the resistance string, to the electricity for inputting external voltage source
Pressure exports desired voltage value after overregulating.
2. the linear voltage regulator of adjustable reference voltage according to claim 1, which is characterized in that described control unit exports
Control signal ctr1~ctr8 and the switch series in eight NMOS tube M1~M8 correspond.
3. the linear voltage regulator of adjustable reference voltage according to claim 1 or 2, which is characterized in that in the resistance string
The resistance value of eight resistance R1~R8 can be identical, can not also be identical；The amplifier of resistance R1 and the operational amplifier OP
Output end connects, resistance R8 ground connection；NMOS tube M1 is connect with the amplifier output end of the operational amplifier OP；NMOS tube M8 passes through
The capacitance C ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810675094.0A CN108776503A (en) | 2018-06-27 | 2018-06-27 | A kind of linear voltage regulator of adjustable reference voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810675094.0A CN108776503A (en) | 2018-06-27 | 2018-06-27 | A kind of linear voltage regulator of adjustable reference voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108776503A true CN108776503A (en) | 2018-11-09 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810675094.0A Pending CN108776503A (en) | 2018-06-27 | 2018-06-27 | A kind of linear voltage regulator of adjustable reference voltage |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201152948Y (en) * | 2008-02-03 | 2008-11-19 | 深圳艾科创新微电子有限公司 | Variable outputting linear voltage regulator having short circuit protection |
| CN201229513Y (en) * | 2008-05-30 | 2009-04-29 | 深圳艾科创新微电子有限公司 | Low voltage difference linear voltage regulator |
| CN103543777A (en) * | 2012-07-13 | 2014-01-29 | 创杰科技股份有限公司 | Low dropout regulator and electronic device thereof |
| DE102014016037A1 (en) * | 2014-03-04 | 2015-09-10 | Cambridge Silicon Radio Limited | Low power switched linear regulator |
| CN106444949A (en) * | 2016-12-16 | 2017-02-22 | 电子科技大学 | Low-noise quick-start low-dropout linear regulator |
-
2018
- 2018-06-27 CN CN201810675094.0A patent/CN108776503A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201152948Y (en) * | 2008-02-03 | 2008-11-19 | 深圳艾科创新微电子有限公司 | Variable outputting linear voltage regulator having short circuit protection |
| CN201229513Y (en) * | 2008-05-30 | 2009-04-29 | 深圳艾科创新微电子有限公司 | Low voltage difference linear voltage regulator |
| CN103543777A (en) * | 2012-07-13 | 2014-01-29 | 创杰科技股份有限公司 | Low dropout regulator and electronic device thereof |
| DE102014016037A1 (en) * | 2014-03-04 | 2015-09-10 | Cambridge Silicon Radio Limited | Low power switched linear regulator |
| CN106444949A (en) * | 2016-12-16 | 2017-02-22 | 电子科技大学 | Low-noise quick-start low-dropout linear regulator |
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Application publication date: 20181109 |
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