CN101577418A - Electrostatic discharge protection circuit and electronic system - Google Patents
Electrostatic discharge protection circuit and electronic system Download PDFInfo
- Publication number
- CN101577418A CN101577418A CNA200810097292XA CN200810097292A CN101577418A CN 101577418 A CN101577418 A CN 101577418A CN A200810097292X A CNA200810097292X A CN A200810097292XA CN 200810097292 A CN200810097292 A CN 200810097292A CN 101577418 A CN101577418 A CN 101577418A
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- input
- output pad
- protection circuit
- esd protection
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Abstract
The invention discloses an electrostatic discharge protection circuit which is coupled with an input and output pad and comprises an attenuation unit and a discharge unit. The attenuation unit attenuates electrostatic discharge current so as to generate attenuation current. The discharge unit is used for releasing the attenuation current.
Description
Technical field
The invention relates to a kind of protector, particularly relevant for a kind of protector with electrostatic discharge protective.
Background technology
Along with the evolution of manufacture of semiconductor, the element infringement that static discharge caused has become one of topmost reliability issues concerning integrated circuit (IC) products.Esd event is imitated in the ESD of general using numerous species (electrostatic discharge) test, relatively the ESD test of being familiar with for common people has two kinds, the machine discharge mode (machine model, MM) and the human body discharge mode (humanbody model, HBM).The integrated circuit of general commercial usefulness all must possess to a certain degree HBM and the tolerance level of MM, just can peddle.
Esd protection is the indispensable function of integrated circuit.Especially constantly be contracted to the degree of deep-sub-micrometer along with size, the grid oxic horizon of metal-oxide semiconductor (MOS) is also more and more thinner, and integrated circuit is easier to wreck because of the static discharge phenomenon.In the general industrial standard, the input and output pin of integrated circuit (IC) products (I/O pin) is essential can be by Human Body Model's electrostatic discharge testing more than 2000 volts and the mechanical mode electrostatic discharge testing more than 200 volts.Therefore, in integrated circuit (IC) products, electrostatic discharge protective device must be arranged near all input and output weld pads (pad), is not subjected to the infringement of static discharge current to protect inner core circuit (core circuit).
Summary of the invention
The invention provides a kind of ESD protection circuit, couple the input and output pad, and comprise attenuation units and discharge cell.Attenuation units decay static discharge current is to produce decay current.Discharge cell is in order to discharge this decay current.
The present invention also provides a kind of electronic system, comprises input and output pad, core circuit and ESD protection circuit, is coupled between this input and output pad and this core circuit.ESD protection circuit comprises attenuation units and discharge cell.Attenuation units decay static discharge current is to produce decay current.Discharge cell is in order to discharge this decay current.
For above and other objects of the present invention, feature and advantage can be become apparent, cited below particularlyly go out preferred embodiment, and cooperate appended graphicly, be described in detail below.
Description of drawings
Fig. 1 is the schematic diagram of electronic system of the present invention.
Fig. 2 is that one of ESD protection circuit of the present invention may embodiment.
Fig. 3 is another possibility embodiment of ESD protection circuit of the present invention.
[label declaration]
100: electronic system; 110: the input and output pad;
120: core circuit; 130: ESD protection circuit;
131: attenuation units; 132: discharge cell;
211,212,221,222: diode; 231,232: power line;
311: resistance.
Embodiment
Fig. 1 is the schematic diagram of electronic system of the present invention.Electronic system 100 can be PDA(Personal Digital Assistant), mobile phone (cellular phone), digital camera, TV, global positioning system (GPS), automobile-used display, aviation display, digital frame (digital photo frame), notebook computer or desktop PC.In the present embodiment, electronic system 100 comprises: input and output pad (input/output pad) 110, core circuit 120 and ESD protection circuit 130.
Input and output pad 110 can receive from the signal of external circuit (not shown) or send a signal to external circuit.Core circuit 120 is in order to carry out correlation function.For example, when being panel circuit as if core circuit 120, then correlation function is a display image.If when core circuit 120 was dc voltage changer (DC-DCconverter), then correlation function was a voltage transitions.
Fig. 2 is that one of ESD protection circuit of the present invention may embodiment.As shown in the figure, attenuation units 131 comprises diode ring (diode ring).Diode ring is coupled between input and output pad 110 and the discharge cell 132.In the present embodiment, diode ring comprises diode 211 and 212.The negative electrode of diode 211 couples discharge cell 132, and its anode couples input and output pad 110.The negative electrode of diode 212 couples input and output pad 110, and its anode couples discharge cell 132.
When the static discharge voltage of input and output pad 110 be on the occasion of the time, but conducting diode 211 then, in order to decay static discharge current IESD1.Similarly, when the static discharge voltage of input and output pad 110 is negative value, but conducting diode 212 then.Owing to during diode current flow, can provide equiva lent impedance.By the equiva lent impedance that diode provided, just can improve the resistance of cabling, and then the electric current on the decay cabling.
According to embodiments of the invention, the equiva lent impedance of attenuation units 131 can be 1 to 10000 ohm, also can be 200 to 2000 ohm, also can be 300 to 600 ohm.For example, when supposing diode current flow, its equiva lent impedance is about 500 ohm.If static discharge current IESD1 is 7.63 ampere-hours,, can make about 3.24 amperes of decay current via the decay of diode.Therefore, the ratio of current attenuation is about 57.81%.If static discharge current IESD1 is-8.28 ampere-hours,, can make decay current make an appointment with-3.40 amperes via the decay of diode.Therefore, the ratio of current attenuation can reach 58.93%.In addition, in the present embodiment, discharge cell 132 comprises diode 221 and 222. Diode 221 and 222 is series between power line 231 and 232.Under normal mode (electrostatic discharge event does not take place), power line 231 receives high operation voltage VDD, and power line 232 receives low operating voltage GND.When electrostatic discharge event occurred in input and output pad 110, decay current IESD2 will be by diode 221 or 222, and are released into power line 231 or 232.Therefore, can avoid static discharge current to enter core circuit 120.
Fig. 3 is another possibility embodiment of ESD protection circuit of the present invention.Fig. 3 is similar in appearance to Fig. 2, and difference is that the attenuation units 131 of Fig. 3 is a resistance 311.By the resistance of controlling resistance 311, just may command attenuation degree.For example, when static discharge current IESD1 was constant, if the resistance of resistance 311 heals when big, then the decay current IESD2 that produced of attenuation units 131 was littler.In other embodiments, attenuation units 131 also can be made of other element, as metal-oxide semiconductor (MOS) (MOS) transistor.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking appended the claim scope person of defining.
Claims (10)
1. an ESD protection circuit couples the input and output pad, comprising:
Attenuation units, the decay static discharge current is to produce decay current; And
Discharge cell is in order to discharge this decay current.
2. ESD protection circuit according to claim 1, wherein this attenuation units comprises diode ring, this diode ring is coupled between this input and output pad and this discharge cell.
3. ESD protection circuit according to claim 2, wherein this diode ring comprises:
First diode, its negative electrode couples this discharge cell, and its anode couples this input and output pad; And
Second diode, its negative electrode couple this input and output pad, and its anode couples this discharge cell.
4. ESD protection circuit according to claim 1, wherein this attenuation units is a resistance, is coupled between this input and output pad and this discharge cell.
5. ESD protection circuit according to claim 1, wherein this attenuation units is a metal oxide semiconductor transistor, is coupled between this input and output pad and this discharge cell.
6. ESD protection circuit according to claim 1, wherein the equiva lent impedance of this attenuation units is 200 to 2000 ohm.
7. electronic system comprises:
The input and output pad;
Core circuit; And
ESD protection circuit is coupled between this input and output pad and this core circuit, and comprises:
Attenuation units, the decay static discharge current is to produce decay current; And
Discharge cell is in order to discharge this decay current.
8. electronic system according to claim 7, wherein this attenuation units comprises diode ring, this diode ring is coupled between this input and output pad and this discharge cell.
9. electronic system according to claim 7, wherein this core circuit is a panel circuit.
10. electronic system according to claim 7, wherein this electronic system is personal digital assistant, mobile phone, digital camera, TV, global positioning system, automobile-used display, aviation display, digital frame, notebook computer or desktop PC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810097292XA CN101577418A (en) | 2008-05-09 | 2008-05-09 | Electrostatic discharge protection circuit and electronic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810097292XA CN101577418A (en) | 2008-05-09 | 2008-05-09 | Electrostatic discharge protection circuit and electronic system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101577418A true CN101577418A (en) | 2009-11-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA200810097292XA Pending CN101577418A (en) | 2008-05-09 | 2008-05-09 | Electrostatic discharge protection circuit and electronic system |
Country Status (1)
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| CN (1) | CN101577418A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545192A (en) * | 2011-12-09 | 2012-07-04 | 惠州Tcl移动通信有限公司 | Baseband signal processing chip |
| CN102739164A (en) * | 2011-04-15 | 2012-10-17 | 奇景光电股份有限公司 | Noise filtering circuit and integrated circuit |
| CN103248032A (en) * | 2013-04-27 | 2013-08-14 | 成都市宏山科技有限公司 | Lightning protection circuit applicable to high-voltage environment |
| CN107544167A (en) * | 2017-07-21 | 2018-01-05 | 惠科股份有限公司 | A kind of electrostatic discharge circuit and display panel |
| CN114614784A (en) * | 2022-05-11 | 2022-06-10 | 深圳市鼎阳科技股份有限公司 | Ultra-wideband adjustable amplitude limiter |
-
2008
- 2008-05-09 CN CNA200810097292XA patent/CN101577418A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102739164A (en) * | 2011-04-15 | 2012-10-17 | 奇景光电股份有限公司 | Noise filtering circuit and integrated circuit |
| CN102545192A (en) * | 2011-12-09 | 2012-07-04 | 惠州Tcl移动通信有限公司 | Baseband signal processing chip |
| CN102545192B (en) * | 2011-12-09 | 2015-04-22 | 惠州Tcl移动通信有限公司 | Baseband signal processing chip |
| CN103248032A (en) * | 2013-04-27 | 2013-08-14 | 成都市宏山科技有限公司 | Lightning protection circuit applicable to high-voltage environment |
| CN107544167A (en) * | 2017-07-21 | 2018-01-05 | 惠科股份有限公司 | A kind of electrostatic discharge circuit and display panel |
| WO2019015235A1 (en) * | 2017-07-21 | 2019-01-24 | 惠科股份有限公司 | Electrostatic discharge circuit and display panel |
| US10937384B2 (en) | 2017-07-21 | 2021-03-02 | HKC Corporation Limited | Electrostatic discharge circuit and display panel |
| CN114614784A (en) * | 2022-05-11 | 2022-06-10 | 深圳市鼎阳科技股份有限公司 | Ultra-wideband adjustable amplitude limiter |
| CN114614784B (en) * | 2022-05-11 | 2022-08-02 | 深圳市鼎阳科技股份有限公司 | Ultra-wideband adjustable amplitude limiter |
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Legal Events
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20091111 |