CN102624369B - POR (Power-on Reset) circuit with variable reset point on basis of band gap reference source - Google Patents
POR (Power-on Reset) circuit with variable reset point on basis of band gap reference source Download PDFInfo
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- CN102624369B CN102624369B CN201210008252.XA CN201210008252A CN102624369B CN 102624369 B CN102624369 B CN 102624369B CN 201210008252 A CN201210008252 A CN 201210008252A CN 102624369 B CN102624369 B CN 102624369B
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Abstract
The invention relates to a POR (Power-on Reset) circuit with a variable reset point on the basis of a band gap reference source, which comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first PNP triode, a second PNP triode and an operational amplifier. One resistor is added in a conventional circuit on the basis of the band gap reference source, so that the reset point of over 1.25 V and a voltage value with small change along with the process and the temperature can be implemented. The POR circuit disclosed by the invention has a simple structure, is easy to implement, has strong universality, has small variation of a reset signal POR along with the process and the temperature, can be widely applied to various systems and is particularly applied to a power management system, a power factor correction system and the like with high requirement on the reset voltage point.
Description
Technical field
The present invention relates to the electrify restoration circuit in a kind of integrated circuit, particularly a kind of based on band gap reference and the variable electrification reset por circuit of reduction point.
Background technology
Electrify restoration circuit is to use to latch and (or) analog circuit when the reset signal that supply voltage produces during higher or lower than some magnitudes of voltage.Conventional resistance and electric capacity (being RC) reset circuit are with the difference of flow-route and temperature, and it changes greatly.
Fig. 1 is traditional band-gap reference source circuit, in figure: the output of operational amplifier A 1 connects R4, one end of R1 connects the output of R4, and the other end connects respectively at the emitter of PNP triode Q1, the positive input terminal of operational amplifier A 1, the collector electrode of Q1, the equal ground connection of base stage; The output of a termination R4 of R2, the other end is connected with the negative input end of R3, operational amplifier A 1 respectively, and the output of R3 is connected with the emitter of PNP triode Q2, the collector electrode of Q2, the equal ground connection of base stage.The ratio of adjusting resistance and the Area Ratio of PNP can obtain reference voltage V ref.In Fig. 1, if the disconnection that is connected with R4 by the output of A1, R4 connects power supply, and the output of A1 is exactly reset signal, has so just formed traditional electrify restoration circuit based on band gap reference, and the reduction point of this circuit can only be near bandgap voltage reference 1.25V.
For these reasons, design is a kind of simple in structure, and smaller with flow-route and temperature variation, reduction point relatively flexibly electrify restoration circuit is urgent problems of those skilled in the art.
Summary of the invention
The defect existing for above-mentioned prior art, the object of this invention is to provide a kind ofly based on band gap reference and the variable electrification reset por circuit of reduction point, it is changed smaller with flow-route and temperature, and reduction point is relatively flexible.
Technical scheme of the present invention is: a kind of based on band gap reference and the variable electrification reset por circuit of reduction point, comprise the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the one PNP triode, the 2nd PNP triode and operational amplifier, power input connects the 4th resistance, described the 5th resistance is connected between the output and ground of the 4th resistance, described first resistance one end connects the output of the 4th resistance, the other end is connected with an emitter for PNP triode and the positive input terminal of operational amplifier respectively, the collector electrode of a described PNP triode and base ground connection, described second resistance one end connects the output of the 4th resistance, the other end is connected respectively at the negative input end of the 3rd resistance and operational amplifier, the output of described the 3rd resistance is connected with the emitter of the 2nd PNP triode, the collector electrode of described the 2nd PNP triode and base ground connection.
Further, the emitter area of described the 2nd PNP triode is the more than a times of emitter area of a PNP triode.Preferably, the emitter area of described the 2nd PNP triode Q2 is 8 times or 24 times of emitter area of a PNP triode Q1.
The invention has the beneficial effects as follows:
The present invention increases a resistance and can realize reduction point and be greater than 1.25V and change smaller magnitude of voltage with flow-route and temperature in traditional circuit based on band gap reference.
Circuit structure of the present invention is simple, easily realize, highly versatile, reset signal POR changes smaller with flow-route and temperature, can be widely used in sorts of systems, particularly be applied to resetting voltage point is required in the higher system such as power management and power factor correction.
Brief description of the drawings
Fig. 1 is the schematic diagram of band-gap reference source circuit;
Fig. 2 is the circuit theory diagrams of the embodiment of the present invention 1.
Embodiment
Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
With reference to accompanying drawing 2, specific embodiments of the invention 2 are proposed, as shown in the figure, a kind of based on band gap reference and the variable electrification reset por circuit of reduction point, comprise the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, a PNP triode Q1, the 2nd PNP triode Q2 and operational amplifier A 2, power input V
cCconnect the 4th resistance R 4, described the 5th resistance R 5 is connected between the output and ground of the 4th resistance R 4, described first resistance R 1 one end connects the output of the 4th resistance R 4, the other end is connected with an emitter of PNP triode Q1 and the positive input terminal of operational amplifier A 2 respectively, the collector electrode of a described PNP triode Q1 and base ground connection, described second resistance R 2 one end connect the output of the 4th resistance R 4, the other end is connected with the negative input end of operational amplifier A 2 respectively at the 3rd resistance R 3, the output of described the 3rd resistance R 3 is connected with the emitter of the 2nd PNP triode Q2, the collector electrode of described the 2nd PNP triode Q2 and base ground connection.
The emitter area of described the 2nd PNP triode Q2 is the more than a times of emitter area of a PNP triode Q1.Be preferably, the emitter area of described the 2nd PNP triode Q2 is 8 times or 24 times of emitter area of a PNP triode Q1.In Fig. 2, represent emitter area with A, the emitter area of the 2nd PNP triode Q2 be a PNP triode Q1 emitter area n doubly, wherein n is greater than 1.
The voltage that in Fig. 2, Z is ordered is the threshold voltage of comparator, V
z=V
eB2+ (1+R2/R3) V
tln
n, wherein V
tbe thermal voltage, there is positive temperature coefficient, V
eB2have negative temperature coefficient, the ratio of adjusting R2 and R3 can obtain temperature independent threshold voltage V
z; Comparator judges the scope of supply voltage by judging voltage that X and Y are ordered.
Threshold voltage V
zsubstantially be certain, the ratio of resistance R 4 and the resistance R 5 that increases can change supply voltage and in the time of what value, arrive voltage V
zthereby the adjusting that can realize reduction point is variable.
Claims (3)
1. one kind based on band gap reference and the variable electrification reset por circuit of reduction point, it is characterized in that: comprise the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the one PNP triode, the 2nd PNP triode and operational amplifier, power input connects the 4th resistance, described the 5th resistance is connected between the output and ground of the 4th resistance, described first resistance one end connects the output of the 4th resistance, the other end is connected with an emitter for PNP triode and the positive input terminal of operational amplifier respectively, the collector electrode of a described PNP triode and base ground connection, described second resistance one end connects the output of the 4th resistance, the other end is connected respectively at the negative input end of the 3rd resistance and operational amplifier, the output of described the 3rd resistance is connected with the emitter of the 2nd PNP triode, the collector electrode of described the 2nd PNP triode and base ground connection.
2. according to claim 1 based on band gap reference and the variable electrification reset por circuit of reduction point, it is characterized in that: the emitter area of described the 2nd PNP triode is the more than a times of emitter area of a PNP triode.
3. according to claim 2 based on band gap reference and the variable electrification reset por circuit of reduction point, it is characterized in that: the emitter area of described the 2nd PNP triode is 8 times or 24 times of emitter area of a PNP triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210008252.XA CN102624369B (en) | 2012-01-12 | 2012-01-12 | POR (Power-on Reset) circuit with variable reset point on basis of band gap reference source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210008252.XA CN102624369B (en) | 2012-01-12 | 2012-01-12 | POR (Power-on Reset) circuit with variable reset point on basis of band gap reference source |
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| Publication Number | Publication Date |
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| CN102624369A CN102624369A (en) | 2012-08-01 |
| CN102624369B true CN102624369B (en) | 2014-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210008252.XA Active CN102624369B (en) | 2012-01-12 | 2012-01-12 | POR (Power-on Reset) circuit with variable reset point on basis of band gap reference source |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103677037B (en) * | 2012-09-11 | 2016-04-13 | 意法半导体研发（上海）有限公司 | For generating circuit and the method for bandgap voltage reference |
| CN104734679B (en) * | 2015-02-05 | 2018-05-22 | 西安中颖电子有限公司 | Low voltage reset circuit |
| CN104868892B (en) * | 2015-05-29 | 2018-08-07 | 珠海市杰理科技股份有限公司 | Integrated circuit and its reset circuit |
| CN106502300B (en) * | 2017-01-05 | 2017-10-13 | 电子科技大学 | A kind of over under-voltage protection circuit without comparison voltage |
| CN107707232B (en) * | 2017-10-31 | 2023-04-25 | 上海贝岭股份有限公司 | Power-on reset circuit with variable reset threshold level |
| CN111953330A (en) * | 2020-08-31 | 2020-11-17 | 上海天俣可信物联网科技有限公司 | Low-power-consumption power-on reset circuit irrelevant to temperature |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202475387U (en) * | 2012-01-12 | 2012-10-03 | 苏州华芯微电子股份有限公司 | Power-on reset POR circuit with variable reset voltage point, based on band gap reference source |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007060544A (en) * | 2005-08-26 | 2007-03-08 | Micron Technol Inc | Method and apparatus for producing power on reset having small temperature coefficient |
| US7570090B2 (en) * | 2007-10-30 | 2009-08-04 | Ramtron International Corporation | Fast power-on detect circuit with accurate trip-points |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202475387U (en) * | 2012-01-12 | 2012-10-03 | 苏州华芯微电子股份有限公司 | Power-on reset POR circuit with variable reset voltage point, based on band gap reference source |
Non-Patent Citations (2)
| Title |
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| 一种低功耗高可靠上电复位电路的设计;王小曼等;《微电子学》;20111031;第41卷(第5期);全文 * |
| 王小曼等.一种低功耗高可靠上电复位电路的设计.《微电子学》.2011,第41卷(第5期),全文. |
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| CN102624369A (en) | 2012-08-01 |
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