CN110620561A - Novel network interface circuit of integrated filter device - Google Patents
Novel network interface circuit of integrated filter device Download PDFInfo
- Publication number
- CN110620561A CN110620561A CN201910980239.2A CN201910980239A CN110620561A CN 110620561 A CN110620561 A CN 110620561A CN 201910980239 A CN201910980239 A CN 201910980239A CN 110620561 A CN110620561 A CN 110620561A
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- noise filtering
- mode noise
- filtering unit
- unit
- common mode
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/17—Structural details of sub-circuits of frequency selective networks
- H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
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Abstract
The invention provides a novel network interface circuit of an integrated filter device, which comprises a network interface chip, a filter and a network interface which are connected in sequence, wherein the filter comprises a differential mode noise filtering unit, an electrical isolation and low frequency noise filtering unit and a common mode noise filtering grounding unit; the differential mode noise filtering unit, the electrical isolation and low frequency noise filtering unit and the common mode noise filtering grounding unit can be matched in different orders; the differential mode noise filtering unit is formed by short-circuiting two ends of a pin pair of the SMD paster common mode inductor to form a center tap line pair; the electric isolation and low-frequency noise filtering unit is an SMD capacitor; the common mode noise filtering grounding unit is formed by short-circuiting two ends of a pin pair of the SMD paster common mode inductor to form a center tap line pair, and a center tap of the center tap line pair is used for grounding. Compared with the prior art, the invention can simplify the circuit of the filter circuit and save the cost while ensuring the filtering performance.
Description
Technical Field
The present invention relates to a novel network interface circuit, and more particularly, to a novel network interface circuit of an integrated filter.
Background
The existing network port circuit consists of a transformer, a common mode inductor, a 75 ohm resistor and a 1000PF grounded capacitor. The network filter circuit is formed by a transformer and a common mode inductor, the existing network filter winding mode is that an enameled wire is wound on an annular magnetic ring and is connected with the annular magnetic ring in series to surround the common mode inductor, then the enameled wire is manually wound on a network filter shell, a large amount of manpower is needed for winding, and the network filter circuit has the defects of low efficiency, low automation degree and the like. The existing network interface circuit consists of a network filter, a 75 ohm resistor and a 1000PF capacitor, and has the defects of many parts, high cost and the like.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the utility model provides a novel net gape circuit of integrated filter device can solve current net gape circuit part at least and many, problem with high costs.
In order to solve the technical problems, the invention adopts the technical scheme that: a novel network port circuit of an integrated filter device comprises a network interface chip, a filter and a network interface which are connected in sequence, wherein the filter comprises a differential mode noise filtering unit, an electrical isolation and low frequency noise filtering unit and a common mode noise filtering grounding unit;
the differential mode noise filtering unit, the electrical isolation and low frequency noise filtering unit and the common mode noise filtering grounding unit can be matched in different orders to form a filter;
the differential mode noise filtering unit is formed by short-circuiting two ends of a pin pair of the SMD paster common mode inductor to form a center tap line pair; the electric isolation and low-frequency noise filtering unit is an SMD capacitor;
the common mode noise filtering grounding unit is formed by short-circuiting two ends of a pin pair of the SMD paster common mode inductor to form a center tap line pair, and a center tap of the center tap line pair is used for grounding.
Furthermore, the differential mode noise filtering unit, the electrical isolation and low frequency noise filtering unit and the common mode noise filtering grounding unit are sequentially connected.
Furthermore, the differential mode noise filtering unit and the common mode noise filtering grounding unit are matched to form a voltage transformation circuit, and the common mode noise filtering grounding unit is connected with the electrical isolation and low frequency noise filtering unit.
Furthermore, the electrical isolation and low-frequency noise filtering unit is connected with the differential mode noise filtering unit, and the differential mode noise filtering unit is matched with the common mode noise filtering grounding unit to form a voltage transformation circuit.
Furthermore, the SMD capacitor of the electric isolation and low-frequency noise filtering unit is 0.1uF-100 uF.
Further, the center tap of the center tap line pair of the differential mode noise filtering unit is connected with a power supply of 1.8V to 3.3V.
Further, the center tap of the center tap line pair of the differential mode noise filtering unit is coupled to the ground through the capacitance of 0.1UF at the PHY end of the network interface chip.
Further, the network interface is an RJ45 interface.
The invention has the beneficial effects that: the novel network port circuit integrated filter is formed by matching a differential mode noise filtering unit, an electrical isolation and low-frequency noise filtering unit and a common mode noise filtering grounding unit according to different orders, wherein the differential mode noise filtering unit and the common mode noise filtering grounding unit are formed by short-circuiting two ends of a butt-pin of an SMD (surface mounted device) patch common mode inductor together to form a center tap line pair; the filter circuit is beneficial to the full-automatic production of the network interface circuit, simplifies the working procedure and saves the labor, and in addition, compared with the existing network port circuit, the filter circuit omits 75 ohm resistor and capacitor of a BOB-SMITH circuit, simplifies the circuit and saves the cost.
Drawings
The following detailed description of the invention refers to the accompanying drawings.
Fig. 1 is a circuit diagram of a novel network port of an integrated filter device according to an embodiment of the present invention;
fig. 2 is a novel net-port circuit of an integrated filter device according to yet another embodiment of the present invention;
fig. 3 is a novel net gape circuit of an integrated filter device according to yet another embodiment of the present invention;
FIG. 4 is a diagram of a differential mode noise filtering unit according to an embodiment of the present invention;
fig. 5 is a diagram of a differential mode noise filtering unit and a common mode noise filtering grounding unit according to an embodiment of the present invention.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Example one
As shown in fig. 1, a novel network interface circuit of an integrated filter device includes a network interface chip 10, a filter 20 and a network interface 30, which are connected in sequence, where the filter 20 includes a differential mode noise filtering unit 21, an electrical isolation and low frequency noise filtering unit 22, and a common mode noise filtering ground unit 23;
the differential mode noise filtering unit 21, the electrical isolation and low frequency noise filtering unit 22 and the common mode noise filtering grounding unit 23 are sequentially connected to form a filter 20;
the differential mode noise filtering unit 21 is formed by short-circuiting two ends of a pin pair of the SMD common mode inductor to form a center tap line pair; the electrical isolation and low frequency noise filtering unit 22 is an SMD capacitor; as shown in fig. 4, after the pair pins of the SMD chip common mode inductor are short-circuited, taps are obtained to form a pair of tap lines.
The common mode noise filtering grounding unit 23 is formed by short-circuiting two ends of a pin pair of the SMD patch common mode inductor together to form a center tap line pair, and a center tap of the center tap line pair is used for grounding.
Specifically, the SMD capacitor of the electrical isolation and low frequency noise filtering unit 22 is 0.1uF to 100 uF. The center tap of the center tap line pair of the differential mode noise filtering unit 21 is connected to a power supply of 1.8V to 3.3V. The center tap of the center tap line pair of the differential mode noise filtering unit 21 is coupled to ground through a capacitance of 0.1UF at the PHY terminal of the network interface chip 10. The network interface 30 is an RJ45 interface.
The differential mode noise filtering unit 21, the electrical isolation and low frequency noise filtering unit 22 and the common mode noise filtering grounding unit 23 in the embodiment are sequentially connected and coupled to form a novel network filtering circuit, and have the functions of signal coupling and electromagnetic interference suppression, so that seamless transmission of network signals is ensured; the common mode noise filtering grounding unit 23 can form high impedance for the differential mode signal, has no influence on the common mode signal, and directly guides the common mode noise to the ground, thereby ensuring better network transmission of useful signals. The filter 20 circuit is beneficial to the full-automatic production of a network interface circuit, simplifies the working procedure and saves the labor, and in addition, compared with the existing network circuit, the 75 ohm resistor and the capacitor of a BOB-SMITH circuit are omitted, the circuit is simplified, and the cost is saved.
Example two
As shown in fig. 2, a novel network interface circuit of an integrated filter device includes a network interface chip 10, a filter 20 and a network interface 30, which are connected in sequence, where the filter 20 includes a differential mode noise filtering unit 21, an electrical isolation and low frequency noise filtering unit 22, and a common mode noise filtering ground unit 23;
the differential mode noise filtering unit 21 is matched with the common mode noise filtering grounding unit 23 to form a voltage transformation circuit, and the common mode noise filtering grounding unit 23 is connected with the electrical isolation and low frequency noise filtering unit 22; wherein the transformation circuit is shown in fig. 5.
The differential mode noise filtering unit 21 is formed by short-circuiting two ends of a pin pair of the SMD common mode inductor to form a center tap line pair; the electrical isolation and low frequency noise filtering unit 22 is an SMD capacitor; as shown in fig. 4, after the pair pins of the SMD chip common mode inductor are short-circuited, taps are obtained to form a pair of tap lines.
The common mode noise filtering grounding unit 23 is formed by short-circuiting two ends of a pin pair of the SMD patch common mode inductor together to form a center tap line pair, and a center tap of the center tap line pair is used for grounding.
Specifically, the SMD capacitor of the electrical isolation and low frequency noise filtering unit 22 is 0.1uF to 100 uF. The center tap of the center tap line pair of the differential mode noise filtering unit 21 is connected to a power supply of 1.8V to 3.3V. The center tap of the center tap line pair of the differential mode noise filtering unit 21 is coupled to ground through a capacitance of 0.1UF at the PHY terminal of the network interface chip 10. The network interface 30 is an RJ45 interface.
The differential mode noise filtering unit 21, the common mode noise filtering grounding unit 23 and the electrical isolation and low-frequency noise filtering unit 22 in the embodiment are coupled to form a novel network filtering circuit, which has the functions of signal coupling and electromagnetic interference suppression, thereby ensuring seamless transmission of network signals; the common mode noise filtering grounding unit 23 can form high impedance for the differential mode signal, has no influence on the common mode signal, and directly guides the common mode noise to the ground, thereby ensuring better network transmission of useful signals. The filter 20 circuit is beneficial to the full-automatic production of a network interface circuit, simplifies the working procedure and saves the labor, and in addition, compared with the existing network circuit, the 75 ohm resistor and the capacitor of a BOB-SMITH circuit are omitted, the circuit is simplified, and the cost is saved.
EXAMPLE III
As shown in fig. 3, a novel network interface circuit of an integrated filter device includes a network interface chip 10, a filter 20 and a network interface 30, which are connected in sequence, where the filter 20 includes a differential mode noise filtering unit 21, an electrical isolation and low frequency noise filtering unit 22, and a common mode noise filtering ground unit 23;
the electrical isolation and low-frequency noise filtering unit 22 is connected with the differential mode noise filtering unit 21, and the differential mode noise filtering unit 21 is matched with the common mode noise filtering grounding unit 23 to form a voltage transformation circuit; wherein the transformation circuit is shown in fig. 5.
The differential mode noise filtering unit 21 is formed by short-circuiting two ends of a pin pair of the SMD common mode inductor to form a center tap line pair; the electrical isolation and low frequency noise filtering unit 22 is an SMD capacitor; as shown in fig. 4, after the pair pins of the SMD chip common mode inductor are short-circuited, taps are obtained to form a pair of tap lines.
The common mode noise filtering grounding unit 23 is formed by short-circuiting two ends of a pin pair of the SMD patch common mode inductor together to form a center tap line pair, and a center tap of the center tap line pair is used for grounding.
Specifically, the SMD capacitor of the electrical isolation and low frequency noise filtering unit 22 is 0.1uF to 100 uF. The center tap of the center tap line pair of the differential mode noise filtering unit 21 is connected to a power supply of 1.8V to 3.3V. The center tap of the center tap line pair of the differential mode noise filtering unit 21 is coupled to ground through a capacitance of 0.1UF at the PHY terminal of the network interface chip 10. The network interface 30 is an RJ45 interface.
The electrical isolation and low-frequency noise filtering unit 22, the differential mode noise filtering unit 21 and the common mode noise filtering grounding unit 23 in the embodiment can be coupled into a novel network filtering circuit, and have the functions of signal coupling and electromagnetic interference suppression, so that seamless transmission of network signals is ensured; the common mode noise filtering grounding unit 23 can form high impedance for the differential mode signal, has no influence on the common mode signal, and directly guides the common mode noise to the ground, thereby ensuring better network transmission of useful signals. The filter 20 circuit is beneficial to the full-automatic production of a network interface circuit, simplifies the working procedure and saves the labor, and in addition, compared with the existing network circuit, the 75 ohm resistor and the capacitor of a BOB-SMITH circuit are omitted, the circuit is simplified, and the cost is saved.
The first … … and the second … … are only used for name differentiation and do not represent how different the importance and position of the two are.
Here, the upper, lower, left, right, front, and rear represent only relative positions thereof and do not represent absolute positions thereof.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. The utility model provides a novel net gape circuit of integrated filter device, includes the network interface chip, wave filter and the network interface that connect gradually, its characterized in that: the filter comprises a differential mode noise filtering unit, an electrical isolation and low-frequency noise filtering unit and a common mode noise filtering grounding unit;
the differential mode noise filtering unit, the electrical isolation and low frequency noise filtering unit and the common mode noise filtering grounding unit can be matched in different orders to form a filter;
the differential mode noise filtering unit is formed by short-circuiting two ends of a pin pair of the SMD paster common mode inductor to form a center tap line pair; the electric isolation and low-frequency noise filtering unit is an SMD capacitor;
the common mode noise filtering grounding unit is formed by short-circuiting two ends of a pin pair of the SMD paster common mode inductor to form a center tap line pair, and a center tap of the center tap line pair is used for grounding.
2. A novel portal circuit for an integrated filter device as defined in claim 1, wherein: the differential mode noise filtering unit, the electrical isolation and low frequency noise filtering unit and the common mode noise filtering grounding unit are sequentially connected.
3. A novel portal circuit for an integrated filter device as defined in claim 1, wherein: the differential mode noise filtering unit is matched with the common mode noise filtering grounding unit to form a voltage transformation circuit, and the common mode noise filtering grounding unit is connected with the electrical isolation and low-frequency noise filtering unit.
4. A novel portal circuit for an integrated filter device as defined in claim 1, wherein: the electric isolation and low-frequency noise filtering unit is connected with the differential mode noise filtering unit, and the differential mode noise filtering unit is matched with the common mode noise filtering grounding unit to form a voltage transformation circuit.
5. A novel net gape circuit of an integrated filter device as claimed in any one of claims 1 to 4, wherein: and the SMD capacitor of the electric isolation and low-frequency noise filtering unit is 0.1-100 uF.
6. A novel portal circuit for an integrated filter device as defined in claim 6, wherein: the center tap of the center tap line pair of the differential mode noise filtering unit is connected with a power supply of 1.8V to 3.3V.
7. A novel portal circuit for an integrated filter device as defined in claim 6, wherein: the center taps of the center tap line pairs of the differential mode noise filtering unit are coupled to ground through the capacitance of 0.1UF at the PHY end of the network interface chip.
8. A novel portal circuit for an integrated filter device as defined in claim 1, wherein: the network interface is an RJ45 interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910980239.2A CN110620561A (en) | 2019-10-15 | 2019-10-15 | Novel network interface circuit of integrated filter device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910980239.2A CN110620561A (en) | 2019-10-15 | 2019-10-15 | Novel network interface circuit of integrated filter device |
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| Publication Number | Publication Date |
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| CN110620561A true CN110620561A (en) | 2019-12-27 |
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| CN201910980239.2A Pending CN110620561A (en) | 2019-10-15 | 2019-10-15 | Novel network interface circuit of integrated filter device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115167214A (en) * | 2022-07-14 | 2022-10-11 | 广州致远电子股份有限公司 | Integrated chip for vehicle-mounted Ethernet, vehicle-mounted control system and vehicle |
-
2019
- 2019-10-15 CN CN201910980239.2A patent/CN110620561A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115167214A (en) * | 2022-07-14 | 2022-10-11 | 广州致远电子股份有限公司 | Integrated chip for vehicle-mounted Ethernet, vehicle-mounted control system and vehicle |
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