CN202076991U - Impedance-matching and conducted radiated interference-reducing circuit - Google Patents
Impedance-matching and conducted radiated interference-reducing circuit Download PDFInfo
- Publication number
- CN202076991U CN202076991U CN2011201399580U CN201120139958U CN202076991U CN 202076991 U CN202076991 U CN 202076991U CN 2011201399580 U CN2011201399580 U CN 2011201399580U CN 201120139958 U CN201120139958 U CN 201120139958U CN 202076991 U CN202076991 U CN 202076991U
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- China
- Prior art keywords
- hdmi
- impedance
- conducted
- matching
- dvi
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 230000005855 radiation Effects 0.000 claims description 10
- 230000011664 signaling Effects 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000002452 interceptive effect Effects 0.000 abstract 1
- 230000002401 inhibitory effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Abstract
The utility model discloses an impedance-matching and conducted radiated interference-reducing circuit, which comprises an HDMI (High-Definition Multimedia Interface) or DVI (Digital Video Interactive) signal module and a decoder, and buffer resistors which are 10 Ohms to 100 Ohms are respectively connected in series with differential signal data transmission lines between the HDMI or DVI signal module and the decoder. Consequently, the current entering the chip can be effectively reduced, and the damage of the chip caused by ESD (electrostatic discharge) can be reduced. Meanwhile, the buffer resistors can effectively inhibit conducted radiated interference as well. After the buffer resistors are added, the requirement for impedance-matching PCB (printed circuit board) wiring for high-speed signals is greatly decreased.
Description
Technical field
The utility model relates to the circuit field of electronic product, relates in particular to a kind of impedance matching and reduces the circuit that conduct radiation is disturbed.
Background technology
At present between HDMI or DVI high-speed digital signal module and decoding chip, after inserting outside signal input device such as imperfect earths such as DVD, computer, can produce a large amount of static on the ground at shell, when the moment of inserting cable, decoding device still can appear in the absorption of depending the ESD device alone to be burnt by ESD, and this is a urgent problem.
The utility model content
The purpose of this utility model provides the impedance matching of a kind of HDMI of improvement, DVI high-speed digital signal and reduces the circuit that conduct radiation is disturbed, and described circuit structure is simple, and production cost is low.
For achieving the above object, the utility model provides a kind of impedance matching and has reduced the circuit that conduct radiation is disturbed, comprise HDMI or DVI signaling module, decoding chip, the buffer resistance of the 10-100 ohm of in the differential signal data line between HDMI or DVI signaling module and the decoding chip, connecting respectively.
Further, connect respectively in differential signal data line between HDMI or DVI signaling module and decoding chip and the clock line buffer resistance of 10-100 ohm.
The utility model circuit structure is simple, production cost is low, be the buffer resistance of 10-100 ohm of in the differential signal data line between HDMI or DVI signaling module and the decoding chip, connecting respectively, can effectively reduce the electric current that enters chip like this, reduce the damage of ESD chip.Buffer resistance disturbs conduct radiation simultaneously also good inhibitory effect.After increasing buffer resistance, require to have reduced a lot for the PCB layout of the impedance matching of high speed signal.
Description of drawings
Fig. 1 is the utility model impedance matching and the circuit diagram that reduces the circuit of conduct radiation interference.
Embodiment
Please refer to Fig. 1, the utility model embodiment provides a kind of impedance matching and reduces the circuit that conduct radiation is disturbed, comprise HDMI or DVI signaling module, decoding chip, the buffer resistance of the 10-100 ohm of in the differential signal data line between HDMI or DVI signaling module and the decoding chip, connecting respectively.
Concrete, difference series buffer resistance R1-R6 in six differential signal data lines between HDMI or DVI signaling module and decoding chip, difference series buffer resistance R9, R10 in 2 clock lines.Can effectively reduce the electric current that enters chip like this, reduce the damage of ESD chip.Buffer resistance disturbs conduct radiation simultaneously also good inhibitory effect.After increasing buffer resistance, require to have reduced a lot for the PCB layout of the impedance matching of high speed signal.
Claims (2)
1. an impedance matching and reduce the circuit that conduct radiation is disturbed, it is characterized in that: comprise HDMI or DVI signaling module, decoding chip, the buffer resistance of the 10-100 ohm of in the differential signal data line between HDMI or DVI signaling module and the decoding chip, connecting respectively.
2. impedance matching and reduce the circuit that conduct radiation is disturbed according to claim 1 is characterized in that: the buffer resistance of the 10-100 ohm of connecting respectively in differential signal data line between HDMI or DVI signaling module and decoding chip and the clock line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201399580U CN202076991U (en) | 2011-05-05 | 2011-05-05 | Impedance-matching and conducted radiated interference-reducing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201399580U CN202076991U (en) | 2011-05-05 | 2011-05-05 | Impedance-matching and conducted radiated interference-reducing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202076991U true CN202076991U (en) | 2011-12-14 |
Family
ID=45115067
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201399580U Expired - Lifetime CN202076991U (en) | 2011-05-05 | 2011-05-05 | Impedance-matching and conducted radiated interference-reducing circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202076991U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109890189A (en) * | 2019-02-18 | 2019-06-14 | 晶晨半导体（深圳）有限公司 | A kind of electrostatic protection method |
-
2011
- 2011-05-05 CN CN2011201399580U patent/CN202076991U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109890189A (en) * | 2019-02-18 | 2019-06-14 | 晶晨半导体（深圳）有限公司 | A kind of electrostatic protection method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: GUANGZHOU CVT ELECTRONICS TECHNOLOGY CO., LTD. Free format text: FORMER NAME: GUANGZHOU SHIYUAN ELECTRONICS TECHNOLOGY CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 510663 Guangdong city of Guangzhou province Guangzhou Science City Kezhu Road No. 192 Patentee after: Guangzhou Shiyuan Electronic Technology Company Limited Address before: 510663 Guangdong city of Guangzhou province Guangzhou Science City Kezhu Road No. 192 Patentee before: Guangzhou Shiyuan Electronic Technology Co.,Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20111214 |
|
| CX01 | Expiry of patent term |