CN209994104U - Protective circuit - Google Patents
Protective circuit Download PDFInfo
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- CN209994104U CN209994104U CN201920305418.1U CN201920305418U CN209994104U CN 209994104 U CN209994104 U CN 209994104U CN 201920305418 U CN201920305418 U CN 201920305418U CN 209994104 U CN209994104 U CN 209994104U
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Abstract
The utility model provides a protection circuit, which comprises a digital circuit, an analog circuit and a connecting module, wherein the digital circuit and the analog circuit are connected through the connecting module; the digital circuit comprises a digital input-output port ground and a digital circuit ground, and the analog circuit comprises an analog circuit ground; the connection module comprises a first bidirectional diode and a second bidirectional diode, the analog circuit ground is connected with the digital input/output port ground through the first bidirectional diode, and the analog circuit ground is connected with the digital circuit ground through the second bidirectional diode.
Description
Technical Field
The utility model belongs to integrated circuit design field, concretely relates to protection circuit.
Background
With the development of semiconductor technology, the integration level of chips is higher and higher, the internal structure is more and more complex, and digital-analog hybrid circuits are more and more widely applied. However, in the digital-analog hybrid circuit, the digital signal is a noise source of the analog signal, which may cause disturbance to the whole circuit, and such noise and disturbance may adversely affect the operation performance of the analog circuit. In addition, the whole life cycle of the chip from production to application can be exposed to various electrostatic environments, causing electrostatic damage to the integrated circuit. The traditional analog circuit ground and the digital circuit ground of the digital-analog hybrid circuit are not effectively separated to generate noise, and the cores of the digital circuit and the analog circuit cannot be effectively protected against static discharge in an integrated circuit.
Disclosure of Invention
To the not enough that exists among the prior art, the utility model aims to provide a protection circuit solves the problem that prior art can't solve among the integrated circuit digital circuit and analog circuit because the damage that electrostatic discharge brought.
In order to solve the technical problem, the application adopts the following technical scheme:
compared with the prior art, the utility model, profitable technological effect is:
the utility model discloses stronger noise-resistant ability has to provide effectual antistatic breakdown protection to the internal circuit.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of a partial structure of the present invention;
the symbols in the figures are represented as: 1-an analog circuit; 2-a digital circuit; 3-a connection module;
101-analog circuit power supply; 102-analog circuit ground; 201-digital input output port ground; 202-digital input output port power supply; 203-digital circuit ground; 204-digital circuit power supply; 301-a first bidirectional diode; 302-second bidirectional diode.
The details of the present invention are explained in further detail below with reference to the drawings and examples.
Detailed Description
The following embodiments of the present invention are given, and it should be noted that the present invention is not limited to the following embodiments, and all the equivalent transformations made on the basis of the technical solution of the present application all fall into the protection scope of the present invention.
Example (b):
the present embodiment provides a protection circuit, as shown in fig. 1, including a digital circuit 2, an analog circuit 1, and a connection module 3, where the digital circuit 2 and the analog circuit 1 are connected by the connection module 3;
the digital circuit 2 comprises a digital input/output port ground 201 and a digital circuit ground 203, and the analog circuit 1 comprises an analog circuit ground 102;
the connection module 3 comprises at least two sets of bidirectional diodes, the analog circuit ground 102 is connected with the digital input/output port ground 201 through at least one set of bidirectional diodes, and the analog circuit ground 102 is connected with the digital circuit ground 203 through at least one set of bidirectional diodes.
As shown in fig. 2, in the present embodiment, both ends of the analog circuit ground 102 are connected to the digital input/output port ground 201 and the digital circuit ground 203 through the first bidirectional diode 301 and the second bidirectional diode 302, respectively, to form a loop. The first bidirectional diode 301 isolates the analog circuit ground 102 from the digital input/output port ground 201, the second bidirectional diode 302 isolates the analog circuit ground 102 from the digital circuit ground 203, the noise immunity of the analog circuit is improved, and the first bidirectional diode 301 and the second bidirectional diode 302 provide a path for electrostatic discharge between the analog circuit ground 102 and the digital input/output port ground 201 and the digital circuit ground 203. When any one of the three power supply domains of the analog circuit ground 102, the digital input/output port ground 201 and the digital circuit ground 203 is raised in voltage due to generation of static electricity, one of the bidirectional diodes is broken down in reverse to discharge the static electricity.
In addition, in the present embodiment, the analog circuit power supply 101 is physically isolated from the digital circuit 2, especially effectively isolated from the digital circuit power supply 204 with different voltage domains, so as to effectively prevent the leakage phenomenon.
As shown in fig. 1, each of two ends of the analog circuit ground 102 is connected to the digital input/output port ground 201 through at least one set of bidirectional diodes. Each of the two ends of the analog circuit ground 102 is connected to the digital circuit ground 203 through at least one set of bidirectional diodes. This may allow isolation of both ends of the analog circuit ground 102.
The analog circuit 1 further comprises an analog circuit power supply 101 and at least one diode, both ends of the at least one diode being connected to the analog circuit power supply 101 and the analog circuit ground 102, respectively.
As shown in fig. 1 and 2, the analog circuit 1 of the present embodiment further includes an analog circuit ground 102 and a first diode, a cathode of the first diode is connected to the analog circuit power source 101, and an anode of the first diode is connected to the analog circuit ground 102.
When the analog circuit power supply 101 works normally, the first diode is cut off reversely to avoid electric leakage, and when the analog circuit power supply 101 is charged with static electricity, the voltage rises, and the first diode breaks down reversely to form an electrostatic discharge path so as to protect the inner core of the analog circuit.
The digital circuit 2 comprises a digital circuit input/output port power supply 202, a digital circuit power supply 204 and a diode;
the digital input/output port ground 201 is connected with the digital circuit ground 203 through at least one diode;
the digital input output port power supply 202 is connected to the digital input output port ground 201 through at least one diode.
As shown in fig. 1 and 2, similarly to the analog circuit, the cathode of the second diode is connected to the digital circuit power supply, and the anode of the second diode is connected to the digital circuit ground; when the digital circuit power supply works normally, the second diode is cut off in the reverse direction, no leakage is generated, and when the digital circuit power supply 204 carries static electricity, the voltage rises, and the second diode breaks down in the reverse direction to form an electrostatic discharge path so as to protect the inner core of the analog circuit.
The cathode of the third diode is connected with the digital input/output port power supply 202, and the anode of the third diode is connected with the digital input/output port ground 201;
when either one of the two power supply domains rises in voltage due to generation of static electricity, one of the third bidirectional diodes is reverse-broken to discharge the static electricity.
All diodes involved in this embodiment are zener diodes, which have reversibility of reverse breakdown.
Claims (7)
1. A protection circuit is characterized by comprising a digital circuit (2), an analog circuit (1) and a connecting module (3), wherein the digital circuit (2) and the analog circuit (1) are connected through the connecting module (3);
the digital circuit (2) comprises a digital input-output port ground (201) and a digital circuit ground (203), the analog circuit (1) comprises an analog circuit ground (102);
the connection module (3) comprises at least two groups of bidirectional diodes, the analog circuit ground (102) is connected with the digital input/output port ground (201) through the at least one group of bidirectional diodes, and the analog circuit ground (102) is connected with the digital circuit ground (203) through the at least one group of bidirectional diodes.
2. The protection circuit according to claim 1, wherein the analog circuit ground (102) is connected to the digital input/output port ground (201) through at least one set of bidirectional diodes, comprising
Each of two ends of the analog circuit ground (102) is respectively connected with the digital input/output port ground (201) through at least one group of bidirectional diodes.
3. The protection circuit according to claim 1, wherein the analog circuit ground (102) is connected to the digital circuit ground (203) through at least one set of bidirectional diodes, comprising
Each of two ends of the analog circuit ground (102) is respectively connected with the digital circuit ground (203) through at least one group of bidirectional diodes.
4. The protection circuit according to claim 1, wherein the digital input-output port ground (201) is connected to the digital circuit ground (203) via at least one set of bidirectional diodes.
5. Protection circuit according to claim 1, characterized in that the analog circuit (1) further comprises an analog circuit power supply (101) and at least one diode, both ends of which are connected to the analog circuit power supply (101) and the analog circuit ground (102), respectively.
6. The protection circuit according to claim 1, wherein the digital circuit (2) comprises a digital input output port power supply (202), a digital circuit power supply (204), and a diode;
the digital circuit power supply (204) is connected with the digital circuit ground (203) through at least one diode;
the digital input/output port power supply (202) is connected with the digital input/output port ground (201) through at least one diode.
7. The protection circuit according to claim 5 or 6, wherein the diode is a zener diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920305418.1U CN209994104U (en) | 2019-03-11 | 2019-03-11 | Protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920305418.1U CN209994104U (en) | 2019-03-11 | 2019-03-11 | Protective circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209994104U true CN209994104U (en) | 2020-01-24 |
Family
ID=69289178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920305418.1U Active CN209994104U (en) | 2019-03-11 | 2019-03-11 | Protective circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209994104U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2019
- 2019-03-11 CN CN201920305418.1U patent/CN209994104U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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