CN202550986U - Novel power-on reset circuit - Google Patents
Novel power-on reset circuit Download PDFInfo
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- CN202550986U CN202550986U CN2012200776540U CN201220077654U CN202550986U CN 202550986 U CN202550986 U CN 202550986U CN 2012200776540 U CN2012200776540 U CN 2012200776540U CN 201220077654 U CN201220077654 U CN 201220077654U CN 202550986 U CN202550986 U CN 202550986U
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Abstract
The utility model discloses a novel power-on reset circuit. A power-on reset circuit can generate reset signals inside a chip, and plays an important role in normal work of the chip. According to the novel power-on reset circuit, under the premise that no external voltage reference is needed or no internal band-gap reference is needed to generate, various power supply voltages can be precisely detected. The novel power-on reset circuit overcomes the defect that a traditional power-on reset circuit needs external precise reference voltage. Compared with the traditional power-on reset circuit, the novel power-on reset circuit has great property improvement, low power consumption, low temperature coefficient, and little process change.
Description
Technical field
The utility model relates to a kind of electrify restoration circuit.
Background technology
Electrify restoration circuit produces the reset signal of chip internal, and is most important to the operate as normal of chip.2004; People such as W.C.Yen are published at one piece 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 the Kuijk band-gap reference that they studied; As shown in Figure 1; Its principle is whether the difference that detects supply voltage VDD and b point voltage Vb is higher than bandgap voltage reference; Because Vb ground connection can be considered Vb=0, promptly detects supply voltage VDD and whether is higher than bandgap voltage reference.Because the emitter of triode and the pressure reduction of base stage and the pressure drop of diode have same negative temperature coefficient; So the triode equivalence replacement diode that can use base stage to link to each other with collector electrode; Whether be used to detect VDD-Vb greater than bandgap voltage reference; Improved circuit is as shown in Figure 2, can know that by Fig. 2 Vb is zero, so the detection effect of this circuit is consistent with the detection effect of circuit shown in Figure 1.
Above-mentioned two kinds of circuit based on the Kuijk bandgap voltage reference, have circuit structure simple, with advantages such as temperature and process deviation are less, shortcoming is that the power level of its detection is fixed on bandgap voltage reference.Yet the height of power level decides according to other circuit requirements in general the application, so foregoing circuit can't satisfy this requirement.
The utility model content
In view of this, the purpose of the utility model is to provide a kind of novel electrify restoration circuit, to realize the accurate detection to the different electrical power level.For addressing the above problem, adopted following technical scheme:
A kind of 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 ends are connected in the input in the same way of comparator, and resistance R 5 one ends are connected in the reverse input end of comparator, and the other end of resistance R 4 and resistance R 5 all is connected in power supply; The resistance of resistance R 4 equals the resistance of R5; Triode Q1 links to each other with the base stage of Q2, the equal ground connection of collection emitter-base bandgap grading of triode Q1 and Q2, and the 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 through resistance R 3; Resistance R 1 is connected between the base stage of power supply and triode Q1, and resistance R 2 is connected between triode Q1 base stage and the ground, can obtain the different detection threshold voltage through the ratio of regulating resistance R 1 and R2.
The area of triode Q1 and Q2 is proportional, and wherein the area of Q2 is greater than the area of Q1.
A kind of 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 ends are connected in the reverse input end of comparator, and resistance R 5 one ends are connected in the input in the same way of comparator, and the other end of resistance R 4 and resistance R 5 all is connected in power supply; The resistance of resistance R 4 equals the resistance of R5; Triode Q1 links to each other with the base stage of Q2, the equal ground connection of collection emitter-base bandgap grading of triode Q1 and Q2, and the 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 through resistance R 3; Resistance R 1 is connected between the base stage of power supply and triode Q1, and resistance R 2 is connected between triode Q1 base stage and the ground, can obtain the different detection threshold voltage through the ratio of regulating resistance R 1 and 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.
According to the circuit working principle that the W.C.Yen paper is described, when VDD-Vb=Vref, circuit is exported reset signal; Wherein Vref is a bandgap voltage reference; VDD represents power level, if want to solve the problem of the detection different electrical power level that runs in the practical application, must change the value of Vb.In order to reach this purpose; The utility model improves the electrify restoration circuit that people such as W.C.Yen propose; Because the emitter of triode has same negative temperature coefficient with the pressure reduction of base stage and the pressure drop of diode, so the proportional diode equivalent in the primary circuit is replaced with in proportion triode replacement and the base stage of two triodes is continuous.Promptly put between b and the VDD and transistor base is promptly put between b and the ground series resistor R1 and R2 respectively at transistor base then, thereby change the voltage Vb that b order, reach the purpose of detection different electrical power level, circuit structure is as shown in Figure 3.
Concrete operation principle is following:
Make that bandgap voltage reference is Vref, describe the operation principle of circuit, work as VDD-Vb=V according to the W.C.Yen paper
RefThe time, circuit output reset signal in the circuit shown in Figure 3, is ignored the base current of triode Q1, Q2, then has
Promptly exist
Time output reset signal can obtain the different detection threshold voltage through the ratio of regulating resistance R 2 and R1, and Vb is a transistor base voltage, and earth point voltage is zero potential.
Beneficial effect
The electrify restoration circuit of the utility model design is little with the deviation of flow-route and temperature, can detect the supply voltage that is higher than bandgap voltage reference accurately.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further specified:
Fig. 1 is the used electrification reset structural circuit figure of people such as W.C.Yen;
Fig. 2 is with the electrify restoration circuit behind the triode replacement diode;
Fig. 3 is the circuit diagram of an embodiment of the utility model electrify restoration circuit;
Fig. 4 is the circuit diagram of an embodiment of the utility model electrify restoration circuit;
Fig. 5 is the oscillogram of the utility model electrify restoration circuit comparator input terminal;
Embodiment
Embodiment one
As shown in Figure 3, resistance R 4 one ends are connected in the input in the same way of comparator, and resistance R 5 one ends are connected in the reverse input end of comparator; The other end of resistance R 4 and resistance R 5 all is connected in power supply, and the resistance of resistance R 4 equals the resistance of R5, and triode Q1 links to each other with the base stage of Q2; The equal ground connection of collection emitter-base bandgap grading of triode Q1 and Q2; The Q1 emitter is connected in the input in the same way of comparator, and the emitter of Q2 is connected to the reverse input end of comparator through resistance R 3, and resistance R 1 is connected between the base stage of power supply and triode Q1; Resistance R 2 is connected between triode Q1 base stage and the ground, can obtain the different detection threshold voltage through the ratio of regulating resistance R 1 and 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
VDD=1.18V is then arranged
Ref, promptly circuit is 1.18V at supply voltage
RefThe time produce the reset signal of rising edge.
Embodiment two
As shown in Figure 4, resistance R 4 one ends are connected in the reverse input end of comparator, and resistance R 5 one ends are connected in the input in the same way of comparator; The other end of resistance R 4 and resistance R 5 all is connected in power supply, and the resistance of resistance R 4 equals the resistance of R5, and triode Q1 links to each other with the base stage of Q2; The equal ground connection of collection emitter-base bandgap grading of triode Q1 and Q2; The Q1 emitter is connected in the reverse input end of comparator, and the emitter of Q2 is connected to the input in the same way of comparator through resistance R 3, and resistance R 1 is connected between the base stage of power supply and triode Q1; Resistance R 2 is connected between triode Q1 base stage and the ground, can obtain the different detection threshold voltage through the ratio of regulating resistance R 1 and R2.The area ratio of wherein getting Q1 and Q2 is 1: 8, gets
R1=665.6K Ω, R2=153.1K Ω, according to
VDD=1.23V is then arranged
Ref, promptly circuit is 1.23V at supply voltage
RefThe time 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 ends are connected in the input in the same way of comparator, and resistance R 5 one ends are connected in the reverse input end of comparator, and the other end of resistance R 4 and resistance R 5 all is connected in power supply; The resistance of resistance R 4 equals the resistance of R5; Triode Q1 links to each other with the base stage of Q2, the equal ground connection of collection emitter-base bandgap grading of triode Q1 and Q2, and the 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 through resistance R 3; Resistance R 1 is connected between the base stage of power supply and triode Q1, and resistance R 2 is connected between triode Q1 base stage and the ground, can obtain the different detection threshold voltage through the ratio of regulating resistance R 1 and 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 ends are connected in the reverse input end of comparator, and resistance R 5 one ends are connected in the input in the same way of comparator, and the other end of resistance R 4 and resistance R 5 all is connected in power supply; The resistance of resistance R 4 equals the resistance of R5; Triode Q1 links to each other with the base stage of Q2, the equal ground connection of collection emitter-base bandgap grading of triode Q1 and Q2, and the 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 through resistance R 3; Resistance R 1 is connected between the base stage of power supply and triode Q1, and resistance R 2 is connected between triode Q1 base stage and the ground, can obtain the different detection threshold voltage through the ratio of regulating resistance R 1 and 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 |
|---|---|---|---|
| CN2012200776540U CN202550986U (en) | 2012-03-04 | 2012-03-04 | Novel power-on reset circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200776540U CN202550986U (en) | 2012-03-04 | 2012-03-04 | Novel power-on reset circuit |
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| CN202550986U true CN202550986U (en) | 2012-11-21 |
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| CN2012200776540U Expired - Fee Related CN202550986U (en) | 2012-03-04 | 2012-03-04 | Novel power-on reset circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594312A (en) * | 2012-03-04 | 2012-07-18 | 北京工业大学 | Novel power-on reset circuit |
| CN104601150A (en) * | 2013-10-30 | 2015-05-06 | 国民技术股份有限公司 | Power-on reset circuit |
| 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 |
| CN110488903A (en) * | 2019-09-30 | 2019-11-22 | 上海华虹宏力半导体制造有限公司 | Temperature-compensating por 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 |
-
2012
- 2012-03-04 CN CN2012200776540U patent/CN202550986U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594312A (en) * | 2012-03-04 | 2012-07-18 | 北京工业大学 | Novel power-on reset circuit |
| CN102594312B (en) * | 2012-03-04 | 2014-12-10 | 北京工业大学 | Novel power-on reset circuit |
| CN104601150A (en) * | 2013-10-30 | 2015-05-06 | 国民技术股份有限公司 | Power-on reset circuit |
| CN104601150B (en) * | 2013-10-30 | 2018-08-17 | 国民技术股份有限公司 | A kind of electrification reset circuit |
| 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 |
| CN110488903A (en) * | 2019-09-30 | 2019-11-22 | 上海华虹宏力半导体制造有限公司 | Temperature-compensating por 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 |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121121 Termination date: 20130304 |