CN102594312B - Novel power-on reset circuit - Google Patents
Novel power-on reset circuit Download PDFInfo
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- CN102594312B CN102594312B CN201210054446.3A CN201210054446A CN102594312B CN 102594312 B CN102594312 B CN 102594312B CN 201210054446 A CN201210054446 A CN 201210054446A CN 102594312 B CN102594312 B CN 102594312B
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- resistance
- triode
- comparator
- base stage
- reset circuit
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Abstract
The invention discloses a novel power-on reset circuit. The power-on reset circuit generates reset signals inside a chip and is very important to the normal work of the chip. The novel power-on reset circuit can precisely detect various power voltages without an external voltage reference or generating an inner band-gap reference, overcomes the defects that a traditional power-on reset circuit needs an accurate reference voltage provided by the outside, is greatly promoted in performance compared with the traditional power-on reset circuit, and has low power consumption and temperature coefficient and small process change.
Description
Technical field
The present invention relates to a kind of electrify restoration circuit.
Background technology
Electrify restoration circuit produces the reset signal of chip internal, most important to the normal work of chip.2004, the people such as W.C.Yen are published at one section in the scientific paper that is called " A precision CMOS power-on reset circuit with power noise immunity for low-voltage technology " in " IEICE Trans.Electron " and have introduced the electrify restoration circuit based on Kuijk band-gap reference that they study, as shown in Figure 1, its principle is whether to detect the difference of supply voltage VDD and b point voltage Vb higher than bandgap voltage reference, due to Vb ground connection, can be considered Vb=0, whether detect supply voltage VDD higher than bandgap voltage reference.Because the pressure drop of the emitter of triode and the pressure reduction of base stage and diode has same negative temperature coefficient, therefore diode is replaced in the triode equivalence that can be connected with collector electrode by base stage, whether be greater than bandgap voltage reference for detection of VDD-Vb, improved circuit as shown in Figure 2, Vb is zero as shown in Figure 2, therefore the detection effect of this circuit and the detection effect of the circuit shown in Fig. 1 are consistent.
Above-mentioned two kinds of circuit based on Kuijk bandgap voltage reference, have circuit structure simple, with temperature and the advantage such as process deviation is less, shortcoming is that the power level of its detection is fixed on bandgap voltage reference.But the height of power level decides according to other circuit requirements in general application, therefore foregoing circuit cannot meet this requirement.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of novel electrify restoration circuit, to realize the accurate detection to different electrical power level.For addressing the above problem, adopt following technical scheme:
A novel electrify restoration circuit, comprises comparator, triode Q1, triode Q2, resistance R 1, resistance R 2, resistance R 3, resistance R 4, and resistance R 5, resistance R 4 one end are connected in the input in the same way of comparator, resistance R 5 one end are connected in the reverse input end of comparator, the other end of resistance R 4 and resistance R 5 is all connected in power supply, the resistance of resistance R 4 equals the resistance of R5, triode Q1 is connected with the base stage of Q2, the equal ground connection of collection emitter-base bandgap grading of triode Q1 and Q2, Q1 emitter is connected in the input in the same way of comparator, the emitter of Q2 is connected to the reverse input end of comparator by resistance R 3, resistance R 1 is connected between power supply and the base stage of triode Q1, resistance R 2 is connected between triode Q1 base stage and ground, can obtain different detection threshold voltage by regulating resistance R1 from the ratio of R2.
The area of triode Q1 and Q2 is proportional, and wherein the area of Q2 is greater than the area of Q1.
A novel electrify restoration circuit, comprises comparator, triode Q1, triode Q2, resistance R 1, resistance R 2, resistance R 3, resistance R 4, and resistance R 5, resistance R 4 one end are connected in the reverse input end of comparator, resistance R 5 one end are connected in the input in the same way of comparator, the other end of resistance R 4 and resistance R 5 is all connected in power supply, the resistance of resistance R 4 equals the resistance of R5, triode Q1 is connected with the base stage of Q2, the equal ground connection of collection emitter-base bandgap grading of triode Q1 and Q2, Q1 emitter is connected in the reverse input end of comparator, the emitter of Q2 is connected to the input in the same way of comparator by resistance R 3, resistance R 1 is connected between power supply and the base stage of triode Q1, resistance R 2 is connected between triode Q1 base stage and ground, can obtain different detection threshold voltage by regulating resistance R1 from the ratio of R2.
The area of utmost point pipe Q1 and Q2 is proportional, and wherein the area of Q2 is greater than the area of Q1.
The circuit working principle of describing according to W.C.Yen paper, in the time of VDD-Vb=Vref, circuit output reset signal, wherein Vref is bandgap voltage reference, VDD represents power level, if want to solve the problem of the detection different electrical power level running in practical application, must change the value of Vb.In order to reach this object, the electrify restoration circuit that the present invention proposes people such as W.C.Yen improves, because the pressure drop of the emitter of triode and the pressure reduction of base stage and diode has same negative temperature coefficient, therefore the triode that the proportional diode equivalent in primary circuit is replaced with in proportion replaces and the base stage of two triodes is connected.Then put between b and VDD and transistor base puts between b and ground series resistor R1 and R2 respectively at transistor base, thereby change the voltage Vb that b order, reach the object of detection different electrical power level, circuit structure as shown in Figure 3.
Specific works principle is as follows:
Making bandgap voltage reference is Vref, describes the operation principle of circuit according to W.C.Yen paper, works as VDD-Vb=V
reftime, circuit output reset signal, in circuit, ignores the base current of triode Q1, Q2 shown in Fig. 3, has
exist
time export reset signal, can obtain different detection threshold voltage by regulating resistance R2 from the ratio of R1, Vb is transistor base voltage, earth point voltage is zero potential.
beneficial effect
The electrify restoration circuit of the present invention's design is little with the deviation of flow-route and temperature, can detect accurately the supply voltage higher than bandgap voltage reference.
Brief description of the drawings
Below in conjunction with accompanying drawing, the present invention will be further described:
Fig. 1 is the people electrification reset structural circuit figure used such as W.C.Yen;
Fig. 2 replaces the electrify restoration circuit after diode with triode;
Fig. 3 is the circuit diagram of an embodiment of electrify restoration circuit of the present invention;
Fig. 4 is the circuit diagram of an embodiment of electrify restoration circuit of the present invention;
Fig. 5 is the oscillogram of electrify restoration circuit comparator input terminal of the present invention;
Embodiment
Embodiment mono-
As shown in Figure 3, resistance R 4 one end are connected in the input in the same way of comparator, resistance R 5 one end are connected in the reverse input end of comparator, the other end of resistance R 4 and resistance R 5 is all connected in power supply, the resistance of resistance R 4 equals the resistance of R5, triode Q1 is connected with the base stage of Q2, the equal ground connection of collection emitter-base bandgap grading of triode Q1 and Q2, Q 1 emitter is connected in the input in the same way of comparator, the emitter of Q2 is connected to the reverse input end of comparator by resistance R 3, resistance R 1 is connected between power supply and the base stage of triode Q 1, resistance R 2 is connected between triode Q 1 base stage and ground, can obtain different detection threshold voltage by regulating resistance R1 from the ratio of R2.The Area Ratio of wherein getting Q1 and Q2 is 1: 8, gets R1=665.6K Ω, R2=119.8K Ω, R3=43.3K Ω, R4=R5=459.2K Ω basis
there is VDD=1.18V
ref, circuit is 1.18V at supply voltage
reftime produce the reset signal of rising edge.
Embodiment bis-
As shown in Figure 4, resistance R 4 one end are connected in the reverse input end of comparator, resistance R 5 one end are connected in the input in the same way of comparator, the other end of resistance R 4 and resistance R 5 is all connected in power supply, the resistance of resistance R 4 equals the resistance of R5, triode Q1 is connected with the base stage of Q2, the equal ground connection of collection emitter-base bandgap grading of triode Q1 and Q2, Q1 emitter is connected in the reverse input end of comparator, the emitter of Q2 is connected to the input in the same way of comparator by resistance R 3, resistance R 1 is connected between power supply and the base stage of triode Q1, resistance R 2 is connected between triode Q1 base stage and ground, can obtain different detection threshold voltage by regulating resistance R1 from the ratio of R2.The Area Ratio of wherein getting Q1 and Q2 is 1: 8, gets R1=665.6K Ω, R2=153.1K Ω, according to
there is VDD=1.23V
ref, circuit is 1.23V at supply voltage
reftime produce the reset signal of trailing edge.
Claims (4)
1. a novel electrify restoration circuit, is characterized in that, comprises comparator, triode Q1, triode Q2, resistance R 1, resistance R 2, resistance R 3, resistance R 4, and resistance R 5, resistance R 4 one end are connected in the input in the same way of comparator, resistance R 5 one end are connected in the reverse input end of comparator, the other end of resistance R 4 and resistance R 5 is all connected in power supply, the resistance of resistance R 4 equals the resistance of R5, triode Q1 is connected with the base stage of Q2, the equal ground connection of collector electrode of triode Q1 and Q2, Q1 emitter is connected in the input in the same way of comparator, the emitter of Q2 is connected to the reverse input end of comparator by resistance R 3, resistance R 1 is connected between power supply and the base stage of triode Q1, resistance R 2 is connected between triode Q1 base stage and ground, can obtain different detection threshold voltage by regulating resistance R1 from the ratio of R2.
2. a kind of novel electrify restoration circuit according to claim 1, is characterized in that, the area of triode Q1 and Q2 is proportional, and wherein the area of Q2 is greater than the area of Q1.
3. a novel electrify restoration circuit, is characterized in that, comprises comparator, triode Q1, triode Q2, resistance R 1, resistance R 2, resistance R 3, resistance R 4, and resistance R 5, resistance R 4 one end are connected in the reverse input end of comparator, resistance R 5 one end are connected in the input in the same way of comparator, the other end of resistance R 4 and resistance R 5 is all connected in power supply, the resistance of resistance R 4 equals the resistance of R5, triode Q1 is connected with the base stage of Q2, the equal ground connection of collector electrode of triode Q1 and Q2, Q1 emitter is connected in the reverse input end of comparator, the emitter of Q2 is connected to the input in the same way of comparator by resistance R 3, resistance R 1 is connected between power supply and the base stage of triode Q1, resistance R 2 is connected between triode Q1 base stage and ground, can obtain different detection threshold voltage by regulating resistance R1 from the ratio of R2.
4. a kind of novel electrify restoration circuit according to claim 3, is characterized in that, the area of triode Q1 and Q2 is proportional, and wherein the area of Q2 is greater than the area of Q1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210054446.3A CN102594312B (en) | 2012-03-04 | 2012-03-04 | Novel power-on reset circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210054446.3A CN102594312B (en) | 2012-03-04 | 2012-03-04 | Novel power-on reset circuit |
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| Publication Number | Publication Date |
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| CN102594312A CN102594312A (en) | 2012-07-18 |
| CN102594312B true CN102594312B (en) | 2014-12-10 |
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| CN201210054446.3A Expired - Fee Related CN102594312B (en) | 2012-03-04 | 2012-03-04 | Novel power-on reset circuit |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105892553B (en) * | 2016-05-06 | 2017-08-08 | 芯原微电子(上海)有限公司 | The implementation method of supply voltage power on detection circuit and its upper electricity of detection |
| 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 |
| CN107132399A (en) * | 2017-06-29 | 2017-09-05 | 合肥灿芯科技有限公司 | Voltage detecting circuit |
| CN111969987A (en) * | 2020-08-17 | 2020-11-20 | 苏州纳芯微电子股份有限公司 | Power-on reset circuit |
| US11296692B1 (en) | 2021-04-30 | 2022-04-05 | Nxp B.V. | Power-on reset circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102342022A (en) * | 2009-03-11 | 2012-02-01 | 哉英电子股份有限公司 | Power-on reset circuit |
| CN202550986U (en) * | 2012-03-04 | 2012-11-21 | 北京工业大学 | Novel power-on reset circuit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100368613B1 (en) * | 2000-07-07 | 2003-01-24 | 주식회사 케이이씨 | reset circuit with low power consumption |
| JP2007060544A (en) * | 2005-08-26 | 2007-03-08 | Micron Technol Inc | Method and apparatus for producing power on reset having small temperature coefficient |
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2012
- 2012-03-04 CN CN201210054446.3A patent/CN102594312B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102342022A (en) * | 2009-03-11 | 2012-02-01 | 哉英电子股份有限公司 | Power-on reset circuit |
| CN202550986U (en) * | 2012-03-04 | 2012-11-21 | 北京工业大学 | Novel power-on reset circuit |
Non-Patent Citations (4)
| Title |
|---|
| A Precision CMOS Power-On-Reset Circuit with Power Noise Immunity for Low-Voltage Technology;wen-cheng YEN等;《IEICE TRANS. ELECTRON.》;20040531;第E87-C卷(第5期);第778-781页 * |
| wen-cheng YEN等.A Precision CMOS Power-On-Reset Circuit with Power Noise Immunity for Low-Voltage Technology.《IEICE TRANS. ELECTRON.》.2004,第E87-C卷(第5期),第778-781页. * |
| 一种高可靠性上电复位芯片的设计;王汉祥等;《现代电子技术》;20090131(第2期);第12-14页 * |
| 王汉祥等.一种高可靠性上电复位芯片的设计.《现代电子技术》.2009,(第2期), * |
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| CN102594312A (en) | 2012-07-18 |
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