CN104375550A - Circuit structure for improving interference resistance of input port - Google Patents
Circuit structure for improving interference resistance of input port Download PDFInfo
- Publication number
- CN104375550A CN104375550A CN201410634355.6A CN201410634355A CN104375550A CN 104375550 A CN104375550 A CN 104375550A CN 201410634355 A CN201410634355 A CN 201410634355A CN 104375550 A CN104375550 A CN 104375550A
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- China
- Prior art keywords
- circuit
- power supply
- input port
- schmidt
- schmidt circuit
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Abstract
The invention discloses a circuit structure for improving interference resistance of an input port. The circuit structure comprises a power supply, a signal input end, a Schmidt circuit and an RC filter structure, the signal input end is connected to the Schmidt circuit, the power supply is connected to the power input end of the Schmidt circuit through the RC filter structure, the RC filter structure comprises a resistor and a capacitor, one end of the resistor is connected to the power supply, the other end of the resistor is connected to the power input end of the Schmidt circuit and one end of the capacitor, and the other end of the capacitor is grounded. The circuit structure can effectively eliminate interference of the input port and the power supply, and is simple in structure and low in manufacturing cost.
Description
Technical field
The present invention relates to a kind of input port circuit of integrated circuit, be 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 invention 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 used in the present invention is: a kind of circuit structure improving input port anti-interference, comprise power supply, signal input part, Schmidt circuit and RC filter structure, described signal input part is connected to 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 Schmidt circuit and one end of electric capacity, the other end ground connection of described electric capacity.
Because technique scheme is used, the present invention compared with prior art has following advantages:
1. the present invention by increasing a reinforced concrete structure on the power supply of input port, not only can eliminate the interference of input port, can also 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 invention in embodiment one.
Fig. 3 is application schematic diagram of the present invention in embodiment one.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described:
Embodiment one: shown in Figure 2, a kind of circuit structure improving input port anti-interference, comprise power supply, signal input part, Schmidt circuit and RC filter structure, described signal input part is connected to 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 Schmidt circuit and one end of electric capacity, the other end ground connection of described electric capacity.
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, effectively can eliminate the interference of input port and power supply, 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, signal input part, Schmidt circuit and RC filter structure, described signal input part is connected to Schmidt circuit, it is characterized in that: 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 Schmidt circuit and one end of electric capacity, the other end ground connection of described electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410634355.6A CN104375550A (en) | 2014-11-12 | 2014-11-12 | Circuit structure for improving interference resistance of input port |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410634355.6A CN104375550A (en) | 2014-11-12 | 2014-11-12 | Circuit structure for improving interference resistance of input port |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104375550A true CN104375550A (en) | 2015-02-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410634355.6A Pending CN104375550A (en) | 2014-11-12 | 2014-11-12 | Circuit structure for improving interference resistance of input port |
Country Status (1)
| Country | Link |
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| CN (1) | CN104375550A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2588135A1 (en) * | 1985-10-01 | 1987-04-03 | Thomson Csf | Voltage-controlled oscillator |
| CN1152376A (en) * | 1994-07-07 | 1997-06-18 | 罗伯特·博施有限公司 | Process for analog/digital conversion of electric signal and device for implementing it |
| CN2798491Y (en) * | 2004-12-27 | 2006-07-19 | 姜宝峰 | Controlling circuit for colour lamp |
| CN102023182A (en) * | 2010-10-29 | 2011-04-20 | 华南农业大学 | True root mean square value detection-based soil moisture sensor |
| CN102520624A (en) * | 2011-12-09 | 2012-06-27 | 中国科学院长春光学精密机械与物理研究所 | Programmed instruction receiving circuit suitable for on-board load |
| CN204178263U (en) * | 2014-11-12 | 2015-02-25 | 苏州大学 | A kind of circuit structure improving input port anti-interference |
-
2014
- 2014-11-12 CN CN201410634355.6A patent/CN104375550A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2588135A1 (en) * | 1985-10-01 | 1987-04-03 | Thomson Csf | Voltage-controlled oscillator |
| CN1152376A (en) * | 1994-07-07 | 1997-06-18 | 罗伯特·博施有限公司 | Process for analog/digital conversion of electric signal and device for implementing it |
| CN2798491Y (en) * | 2004-12-27 | 2006-07-19 | 姜宝峰 | Controlling circuit for colour lamp |
| CN102023182A (en) * | 2010-10-29 | 2011-04-20 | 华南农业大学 | True root mean square value detection-based soil moisture sensor |
| CN102520624A (en) * | 2011-12-09 | 2012-06-27 | 中国科学院长春光学精密机械与物理研究所 | Programmed instruction receiving circuit suitable for on-board load |
| CN204178263U (en) * | 2014-11-12 | 2015-02-25 | 苏州大学 | A kind of circuit structure improving input port anti-interference |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150225 |