CN202475387U - Power-on reset POR circuit with variable reset voltage point, based on band gap reference source - Google Patents
Power-on reset POR circuit with variable reset voltage point, based on band gap reference source Download PDFInfo
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- CN202475387U CN202475387U CN2012200119892U CN201220011989U CN202475387U CN 202475387 U CN202475387 U CN 202475387U CN 2012200119892 U CN2012200119892 U CN 2012200119892U CN 201220011989 U CN201220011989 U CN 201220011989U CN 202475387 U CN202475387 U CN 202475387U
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- pnp triode
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- band gap
- gap reference
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Abstract
The utility model relates to a power-on reset POR circuit with a variable reset voltage point, based on a band gap reference source, comprising a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first PNP transistor, a second PNP transistor, and an operation amplifier, the traditional circuit based on the band gap reference source is added with a resistor so as to enable the reset voltage point to be higher than 1.25 V and to varies with technology and temperature change by a small voltage value. The power-on reset POR circuit is simple in structure, easy in implementation and strong in generality, a reset signal POR changes a little with the technology and temperature change, the power-on reset POR circuit can be widely used for various systems, in particular for power supply management and power factor correction systems, etc., with relative high demands for 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 be the reset signal that when supply voltage is higher or lower than some magnitudes of voltage, produces give latch with (or) analog circuit uses.Conventional resistance is different with flow-route and temperature with electric capacity (being RC) reset circuit, and it changes greatly.
Fig. 1 is traditional band-gap reference source circuit; Among the figure: the output of operational amplifier A 1 connects R4; The end of R1 connects the output of R4, and the other end connects the collector electrode of Q1, the equal ground connection of base stage respectively at the emitter of PNP triode Q1, the positive input terminal of operational amplifier A 1; The output of the termination R4 of R2, the other end are 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 adjustment resistance and the area ratio of PNP can obtain reference voltage V ref.Among Fig. 1, if with the output of A1 and the disconnection that is connected of R4, R4 connects power supply, and the output of A1 is exactly reset signal, has so just constituted 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 a kind of simple in structurely, change smallerly with flow-route and temperature, reduction point electrify restoration circuit relatively flexibly is problems of needing solution badly of those skilled in the art.
Summary of the invention
To the defective that above-mentioned prior art exists, the purpose 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 smaller to make that it changes 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 first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, a PNP triode, the 2nd PNP triode and operational amplifier; Power input connects the 4th resistance; Said the 5th resistance is connected between the output and ground of the 4th resistance; Said first resistance, one end connects the output of the 4th resistance, and the other end is connected with the emitter of a PNP triode and the positive input terminal of operational amplifier respectively, the collector electrode of a said PNP triode and base ground connection; Said 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, and the output of said the 3rd resistance is connected with the emitter of the 2nd PNP triode, the collector electrode of said the 2nd PNP triode and base ground connection.
Further, the emitter area of said the 2nd PNP triode is more than a times of emitter area of a PNP triode.Preferably, the emitter area of said 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 in based on the circuit of band gap reference and can realize that reduction point changes smaller magnitude of voltage greater than 1.25V and with flow-route and temperature traditional.
Circuit structure of the present invention is simple; Realize easily, 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 than in the systems such as higher power management and power factor correction.
Description of 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 invention 1.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
With reference to accompanying drawing 2; Specific embodiment 2 of the present invention is 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 first resistance R 1, 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; Said the 5th resistance R 5 is connected between the output and ground of the 4th resistance R 4; Said first resistance R, 1 one ends connect the output of the 4th resistance R 4, and the other end is connected the collector electrode of a said PNP triode Q1 and base ground connection with the emitter of a PNP triode Q1 and the positive input terminal of operational amplifier A 2 respectively; Said second resistance R, 2 one ends connect the output of the 4th resistance R 4; The other end is connected respectively at the negative input end of the 3rd resistance R 3 and operational amplifier A 2, and the output of said the 3rd resistance R 3 is connected with the emitter of the 2nd PNP triode Q2, the collector electrode of said the 2nd PNP triode Q2 and base ground connection.
The emitter area of said the 2nd PNP triode Q2 is more than a times of emitter area of a PNP triode Q1.Be preferably, the emitter area of said the 2nd PNP triode Q2 is 8 times or 24 times of emitter area of a PNP triode Q1.Represent emitter area with A among Fig. 2, 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 Z is ordered among Fig. 2 is the threshold voltage of comparator, V
Z=V
EB2+ (1+R2/R3) V
TLn
n, V wherein
TBe thermal voltage, have positive temperature coefficient, V
EB2Have negative temperature coefficient, the ratio of adjustment R2 and R3 can obtain temperature independent threshold voltage V
ZThe voltage that comparator is ordered through judgement X and Y is judged the scope of supply voltage.
Threshold voltage V
ZBasically be certain, the ratio of resistance R 4 and the resistance R 5 that increases can change supply voltage arrival voltage V when what value
ZThereby, can realize that the adjusting of 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 first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, a PNP triode, the 2nd PNP triode and operational amplifier; Power input connects the 4th resistance; Said the 5th resistance is connected between the output and ground of the 4th resistance; Said first resistance, one end connects the output of the 4th resistance, and the other end is connected with the emitter of a PNP triode and the positive input terminal of operational amplifier respectively, the collector electrode of a said PNP triode and base ground connection; Said 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, and the output of said the 3rd resistance is connected with the emitter of the 2nd PNP triode, the collector electrode of said 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 said the 2nd PNP triode is 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 said 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 |
|---|---|---|---|
| CN2012200119892U CN202475387U (en) | 2012-01-12 | 2012-01-12 | Power-on reset POR circuit with variable reset voltage point, based on band gap reference source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200119892U CN202475387U (en) | 2012-01-12 | 2012-01-12 | Power-on reset POR circuit with variable reset voltage point, based on band gap reference source |
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| CN202475387U true CN202475387U (en) | 2012-10-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200119892U Expired - Fee Related CN202475387U (en) | 2012-01-12 | 2012-01-12 | Power-on reset POR circuit with variable reset voltage point, based on band gap reference source |
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| CN (1) | CN202475387U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102624369A (en) * | 2012-01-12 | 2012-08-01 | 苏州华芯微电子股份有限公司 | POR (Power-on Reset) circuit with variable reset point on basis of band gap reference source |
| CN106482850A (en) * | 2016-11-25 | 2017-03-08 | 北京兆芯电子科技有限公司 | Temperature-detecting device and temperature checking method |
| US11520364B2 (en) | 2020-12-04 | 2022-12-06 | Nxp B.V. | Utilization of voltage-controlled currents in electronic systems |
-
2012
- 2012-01-12 CN CN2012200119892U patent/CN202475387U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102624369A (en) * | 2012-01-12 | 2012-08-01 | 苏州华芯微电子股份有限公司 | POR (Power-on Reset) circuit with variable reset point on basis of band gap reference source |
| CN102624369B (en) * | 2012-01-12 | 2014-10-29 | 苏州华芯微电子股份有限公司 | POR (Power-on Reset) circuit with variable reset point on basis of band gap reference source |
| CN106482850A (en) * | 2016-11-25 | 2017-03-08 | 北京兆芯电子科技有限公司 | Temperature-detecting device and temperature checking method |
| CN106482850B (en) * | 2016-11-25 | 2019-09-17 | 北京兆芯电子科技有限公司 | Temperature-detecting device and temperature checking method |
| US11520364B2 (en) | 2020-12-04 | 2022-12-06 | Nxp B.V. | Utilization of voltage-controlled currents in electronic systems |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121003 Termination date: 20130112 |