CN103515945A - Esd reinforcing circuit - Google Patents
Esd reinforcing circuit Download PDFInfo
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- CN103515945A CN103515945A CN201310501495.1A CN201310501495A CN103515945A CN 103515945 A CN103515945 A CN 103515945A CN 201310501495 A CN201310501495 A CN 201310501495A CN 103515945 A CN103515945 A CN 103515945A
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- agnd
- analog
- esd
- static
- dgnd
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Abstract
The invention discloses an ESD reinforcing circuit and relates to the technical field of electronic circuits. The ESD reinforcing circuit is arranged in a circuit containing an AGND and/or a DGND and a GND, which are separated from each other, and comprises anti-static devices connected in series between the AGND or the DGND and the GND, and static electricity flows from the AGND or the DGND, passes through the anti-static devices, and reaches the GND. An electrostatic signal capable of invading the AGND is quickly released to the GND and the GND disperses the influence caused by static electricity, so that damage caused by static electricity to equipment is effectively avoided, the anti-static capability of the equipment is improved and the service life of the equipment is prolonged.
Description
Technical field
The present invention relates to electronic circuit technology field, particularly the ESD(Electro-Static Discharge in a kind of GND circuit of separation) reinforcement circuit.
Background technology
Analog circuit relates to some more small and weak signals mostly, and the threshold level of digital circuit is all higher, just lower than analog circuit to the requirement of power supply.In some existing digital circuits, have again in the system of analog circuit, the noise that digital circuit produces can interfere with analog circuit, make the signal variation of analog circuit, in order to reduce this interference, technical staff can divide DGND digitally and AGND in analog to hold when design circuit, then certain a bit again by magnetic bead or electric capacity etc. digitally DGND and in analog AGND and main ground GND couple together, to keep the integrality on ground.
General audio signal for example, from Jack(JACK Audio Connection Kit) end while coming at PCB(Printed Circuit Board) placement-and-routing just carried out the separated of AGND and main ground GND in analog, mark specially AGND in analog and, for reference audio signal, reduce to greatest extent the interference of other signal to audio signal.But this circuit design that AGND separates has in analog been destroyed to the complete of main ground GND, and the area of AGND can be very little in analog, is easy to be invaded by static, can cause the damage of equipment.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of ESD reinforcement circuit, this ESD reinforcement circuit can by invade AGND in analog or digitally the electrostatic signal in DGND release rapidly in main ground GND, the impact that disperses static to cause by main ground GND, effectively avoided causing because of static the damage of equipment, improve the anti-static ability of equipment, extended the useful life of equipment.
For solving the problems of the technologies described above, technical scheme of the present invention is:
A kind of ESD reinforcement circuit, be arranged on and comprise separative AGND in analog and/or digitally in the circuit of DGND and main ground GND, comprise described in being serially connected in the Anti-static device between AGND in analog or described digitally DGND and described main ground GND, electrostatic current to be from described AGND in analog or described digitally DGND through described Anti-static device to described main ground GND.
As a kind of execution mode, described Anti-static device is TVS pipe, AGND or described digitally DGND in analog described in the anode of described TVS pipe is electrically connected to, and the cathodic electricity of described TVS pipe connects described main ground GND.Described TVS pipe is two-way TVS pipe.
As another kind of execution mode, described Anti-static device is antistatic diode, AGND or described digitally DGND in analog described in the anode of described antistatic diode is electrically connected to, and the cathodic electricity of described antistatic diode connects described main ground GND.
As another execution mode, described Anti-static device is esd protection chip.
Adopted after technique scheme, the invention has the beneficial effects as follows:
Because ESD reinforcement circuit of the present invention comprises, be serially connected in AGND in analog or the Anti-static device between DGND and main ground GND digitally, electrostatic current to be from AGND in analog or digitally DGND through Anti-static device to main ground GND.When having static by AGND in analog or digitally DGND enters, in analog AGND or digitally the level of DGND can raise, in analog AGND or digitally DGND can absorb fast a part of static, the nonabsorbable static of another part will be released in main ground GND by Anti-static device rapidly, the impact that disperses static to cause circuit by main ground GND, thereby effectively avoided the device damage causing because of static, improve the anti-static ability of equipment, extended the useful life of equipment.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of ESD reinforcement circuit embodiments one of the present invention;
Fig. 2 is the operation principle schematic diagram of ESD reinforcement circuit embodiments one of the present invention.
Embodiment
Below in conjunction with drawings and Examples, further set forth the present invention.
Embodiment mono-:
A reinforcement circuit, is arranged on one in analog in the AGND circuit separated with main ground GND, and the circuit of audio signal of take below describes technical scheme of the present invention and principle as example.
As shown in Figure 1, J1 is the interface Jack of audio signal, in order to prevent that the signal of upper other circuit of PCB from producing and disturbing audio signal, the AGND region in analog of having marked independent on PCB makes reference for audio signal, therefore the earth terminal of audio interface J1 is electrically connected to AGND in analog, AGND is electrically connected with TVS(Transient Voltage Suppressor in analog) anode of pipe D6, the cathodic electricity of TVS pipe D6 connects main ground GND.TVS pipe D6 is two-way TVS pipe.
As shown in Figure 2, the operation principle of ESD reinforcement circuit of the present invention is as follows:
Because the area of AGND is in analog less, therefore be easy to be invaded by static, when static enters from audio interface J1, for the level of the AGND in analog of reference audio signal, can raise, now AGND can absorb a part of static fast in analog; Another part does not absorb or absorbs slower static and can manage D6 by TVS and release rapidly in main ground GND.The area of main ground GND is larger, also stronger to the absorbability of static, thus the impact that can disperse static to cause each components and parts, thus effectively avoided the device damage that causes because of static, improve the anti-static ability of equipment, extended the useful life of equipment.
Embodiment bis-:
Present embodiment and embodiment mono-are basic identical, and its difference is:
TVS pipe in embodiment mono-is replaced by antistatic diode (esd protection diode); AGND is electrically connected to the anode of antistatic diode in analog; the cathodic electricity of antistatic diode connects main ground GND, and antistatic diode can play equally and will invade electrostatic leakage in AGND in analog to the effect in main ground GND.
Present embodiment is compared with embodiment mono-, and the price of the cost ratio TVS pipe of antistatic diode is low, therefore the cost of circuit is lower, but its anti-static effect is not as embodiment mono-.
Embodiment tri-:
Present embodiment and embodiment mono-are basic identical, and its difference is:
TVS pipe in embodiment mono-is replaced by esd protection chip, can play equally and will invade electrostatic leakage in AGND in analog to the effect in main ground GND.
Present embodiment is compared with embodiment bis-with embodiment mono-, adopt the circuit cost of esd protection chip relatively high, but its anti-static effect is better.
Above-described embodiment be take the circuit separated with main ground GND of AGND in analog and technical scheme of the present invention and principle has been done to detailed elaboration as example, in practical application, for the technical problem that digitally the DGND circuit separated with main ground GND can adopt technical scheme solution static of the present invention to discharge equally, because of its execution mode same as the previously described embodiments, therefore do not repeat them here.
The present invention is not limited to above-mentioned concrete execution mode, and those of ordinary skill in the art is from above-mentioned design, and without performing creative labour, all conversion of having done, within all dropping on protection scope of the present invention.
Claims (5)
1.ESD reinforcement circuit, it is characterized in that, be arranged on and comprise separative AGND in analog and/or digitally in the circuit of DGND and main ground GND, comprise described in being serially connected in the Anti-static device between AGND in analog or described digitally DGND and described main ground GND, electrostatic current to be from described AGND in analog or described digitally DGND through described Anti-static device to described main ground GND.
2. ESD reinforcement circuit according to claim 1, is characterized in that, described Anti-static device is TVS pipe, AGND or described digitally DGND in analog described in the anode of described TVS pipe is electrically connected to, and the cathodic electricity of described TVS pipe connects described main ground GND.
3. ESD reinforcement circuit according to claim 2, is characterized in that, described TVS pipe is two-way TVS pipe.
4. ESD reinforcement circuit according to claim 1, it is characterized in that, described Anti-static device is antistatic diode, AGND or described digitally DGND in analog described in the anode of described antistatic diode is electrically connected to, and the cathodic electricity of described antistatic diode connects described main ground GND.
5. ESD reinforcement circuit according to claim 1, is characterized in that, described Anti-static device is esd protection chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310501495.1A CN103515945A (en) | 2013-10-23 | 2013-10-23 | Esd reinforcing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310501495.1A CN103515945A (en) | 2013-10-23 | 2013-10-23 | Esd reinforcing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103515945A true CN103515945A (en) | 2014-01-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310501495.1A Pending CN103515945A (en) | 2013-10-23 | 2013-10-23 | Esd reinforcing circuit |
Country Status (1)
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| CN (1) | CN103515945A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108022911A (en) * | 2016-10-31 | 2018-05-11 | 深圳市中兴微电子技术有限公司 | A kind of system-on-chip of Flip-Chip Using |
| CN108846202A (en) * | 2018-06-13 | 2018-11-20 | 郑州云海信息技术有限公司 | A kind of method and device for checking simulation ground and being digitally electrically connected |
| CN110967852A (en) * | 2019-11-20 | 2020-04-07 | Tcl华星光电技术有限公司 | Liquid crystal display device having a plurality of pixel electrodes |
| CN115825705A (en) * | 2023-02-15 | 2023-03-21 | 芯动微电子科技(珠海)有限公司 | ESD event detection circuit and detection method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108022911A (en) * | 2016-10-31 | 2018-05-11 | 深圳市中兴微电子技术有限公司 | A kind of system-on-chip of Flip-Chip Using |
| CN108846202A (en) * | 2018-06-13 | 2018-11-20 | 郑州云海信息技术有限公司 | A kind of method and device for checking simulation ground and being digitally electrically connected |
| CN108846202B (en) * | 2018-06-13 | 2022-02-18 | 郑州云海信息技术有限公司 | Method and device for checking electrical connection between analog ground and digital ground |
| CN110967852A (en) * | 2019-11-20 | 2020-04-07 | Tcl华星光电技术有限公司 | Liquid crystal display device having a plurality of pixel electrodes |
| CN110967852B (en) * | 2019-11-20 | 2021-04-27 | Tcl华星光电技术有限公司 | Liquid crystal display device having a plurality of pixel electrodes |
| CN115825705A (en) * | 2023-02-15 | 2023-03-21 | 芯动微电子科技(珠海)有限公司 | ESD event detection circuit and detection method |
| CN115825705B (en) * | 2023-02-15 | 2023-05-09 | 芯动微电子科技(珠海)有限公司 | ESD event detection circuit and detection method |
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Application publication date: 20140115 |