CN204178263U - A kind of circuit structure improving input port anti-interference - Google Patents
A kind of circuit structure improving input port anti-interference Download PDFInfo
- Publication number
- CN204178263U CN204178263U CN201420672583.8U CN201420672583U CN204178263U CN 204178263 U CN204178263 U CN 204178263U CN 201420672583 U CN201420672583 U CN 201420672583U CN 204178263 U CN204178263 U CN 204178263U
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- Prior art keywords
- circuit
- power supply
- interference
- input port
- electric capacity
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Abstract
The utility model discloses a kind of circuit structure improving input port anti-interference, comprise power supply, signal input part and Schmidt circuit, described power supply is connected to the power input of Schmidt circuit through RC filter structure, described RC filter structure comprises a resistance and electric capacity, one end of described resistance is connected to power supply, the other end of described resistance is connected respectively to the power input of smit circuit and one end of electric capacity, the other end ground connection of described electric capacity, described signal input part is connected to Schmidt circuit.The utility model effectively can eliminate the interference on power supply, and structure is simple, low cost of manufacture.
Description
Technical field
The utility model relates to a kind of input port circuit of integrated circuit, is specifically related to a kind of structure improving the input port anti-interference of integrated circuit.
Background technology
In the design of integrated circuit, the anti-interference of circuit is most important, and interference generally enters into chip internal from power supply and input port.The method of existing raising anti-interference is a lot, main method increases capacitor filter, reduce the amplitude of undesired signal, input port increases Schmidt circuit, as shown in Figure 1, Vdd is the power supply of Schmidt trigger, input signal through Schmidt circuit to chip internal circuits, the undesired signal on input port can be eliminated like this, but there is a problem here, if power supply Vdd has interference, even if input signal is fine, undesired signal on power supply also can enter chip internal by Schmidt circuit, disturb triggered as normal or make signal produce distortion.Therefore, need to be further improved existing anti-jamming circuit.
Summary of the invention
Goal of the invention of the present utility model is to provide a kind of circuit structure improving input port anti-interference, by increasing a reinforced concrete structure on the power supply of input port, effectively can eliminate the interference on power supply, and structure is simple, low cost of manufacture.
To achieve the above object of the invention, the technical solution adopted in the utility model is: a kind of circuit structure improving input port anti-interference, comprise power supply, signal input part and Schmidt circuit, described power supply is connected to the power input of Schmidt circuit through RC filter structure, described RC filter structure comprises a resistance and electric capacity, one end of described resistance is connected to power supply, the other end of described resistance is connected respectively to the power input of smit circuit and one end of electric capacity, the other end ground connection of described electric capacity, described signal input part is connected to Schmidt circuit.
Because technique scheme is used, the utility model compared with prior art has following advantages:
1. the utility model by increasing a reinforced concrete structure on the power supply of input port, can eliminate the interference on power supply well, and structure is simple, low cost of manufacture.
2. because Schmidt circuit is CMOS structure, CMOS static state does not have electric current, therefore power consumption is almost nil, namely reinforced concrete structure does not have big current form pressure drop and reduce the operating voltage range of input port, therefore, employing RC filter structure also can be the supply voltage that Schmidt circuit provides stable while eliminating and power supply disturbing.
Accompanying drawing explanation
Fig. 1 is existing anti-jamming circuit structure schematic diagram in background technology.
Fig. 2 is anti-jamming circuit structure schematic diagram of the present utility model in embodiment one.
Fig. 3 is application schematic diagram of the present utility model in embodiment one.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further described:
Embodiment one: shown in Figure 2, a kind of circuit structure improving input port anti-interference, comprise power supply, signal input part and Schmidt circuit, described power supply is connected to the power input of Schmidt circuit through RC filter structure, described RC filter structure comprises a resistance and electric capacity, one end of described resistance is connected to power supply, the other end of described resistance is connected respectively to the power input of smit circuit and one end of electric capacity, the other end ground connection of described electric capacity, described signal input part is connected to Schmidt circuit.
In the present embodiment, power supply is only powered to Schmidt circuit, because Schmidt circuit is CMOS structure, CMOS static state does not have electric current, therefore power consumption is almost nil, that is, reinforced concrete structure does not have big current and form pressure drop and reduce the operating voltage range of input port, can be the supply voltage that Schmidt circuit provides stable.
As shown in Figure 3, it is one of application scheme of the present embodiment, in a LED constant current driving chip, Vdd is the power supply of chip, LED gray-scale Control signal is inputted by Pad port, effectively can eliminate the interference from Pad port through Schmidt trigger, and employing this patent circuit can also eliminate the interference from power supply Vdd effectively, the dutycycle of the grey scale signal control PWM after de-noising, drives outside LED constant current work through output driving circuit.Adopt the art of this patent, can the interference of cancellation port and power supply effectively, ensure that constant-current drive circuit stably works.
Claims (1)
1. one kind is improved the circuit structure of input port anti-interference, comprise power supply and signal input part, it is characterized in that: also comprise Schmidt circuit, described power supply is connected to the power input of Schmidt circuit through RC filter structure, described RC filter structure comprises a resistance and electric capacity, one end of described resistance is connected to power supply, the other end of described resistance is connected respectively to the power input of smit circuit and one end of electric capacity, the other end ground connection of described electric capacity, described signal input part is connected to Schmidt circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420672583.8U CN204178263U (en) | 2014-11-12 | 2014-11-12 | A kind of circuit structure improving input port anti-interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420672583.8U CN204178263U (en) | 2014-11-12 | 2014-11-12 | A kind of circuit structure improving input port anti-interference |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204178263U true CN204178263U (en) | 2015-02-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420672583.8U Expired - Fee Related CN204178263U (en) | 2014-11-12 | 2014-11-12 | A kind of circuit structure improving input port anti-interference |
Country Status (1)
| Country | Link |
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| CN (1) | CN204178263U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104375550A (en) * | 2014-11-12 | 2015-02-25 | 苏州大学 | Circuit structure for improving interference resistance of input port |
-
2014
- 2014-11-12 CN CN201420672583.8U patent/CN204178263U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104375550A (en) * | 2014-11-12 | 2015-02-25 | 苏州大学 | Circuit structure for improving interference resistance of input port |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150225 Termination date: 20171112 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |