阅读说明：本技术 无网络变压器的以太网口通信电路、电路板及以太网设备 (Ethernet port communication circuit without network transformer, circuit board and Ethernet equipment ) 是由 瞿翔楠 秦弋翔 于 2021-07-27 设计创作，主要内容包括：本发明公开了一种无网络变压器的以太网口通信电路、以太网电路板及以太网设备,包括:第一PHY模块、第一偏置模块、隔离模块、第二偏置模块和第二PHY模块；其中,第一PHY模块包括第一发送端口和第二发送端口,第二PHY模块包括第一接收端口和第二接收端口；第一发送端口和第二发送端口分别与第一偏置模块相连；第一接收端口和第二接收端口分别与第二偏置模块相连；第一发送端口通过隔离模块与第一接收端口相连；第二发送端口通过隔离模块与第二接收端口相连,本发明实施例可用于一些不需要变压器进行隔离的设备,提供偏置电路,保证PHY模块正常工作。(The invention discloses an Ethernet port communication circuit without a network transformer, an Ethernet circuit board and Ethernet equipment, which comprise a first PHY module, a first bias module, an isolation module, a second bias module and a second PHY module; the first PHY module comprises a first transmitting port and a second transmitting port, and the second PHY module comprises a first receiving port and a second receiving port; the first sending port and the second sending port are respectively connected with the first bias module; the first receiving port and the second receiving port are respectively connected with the second bias module; the first sending port is connected with the first receiving port through the isolation module; the second sending port is connected with the second receiving port through the isolation module, and the embodiment of the invention can be used for some equipment which does not need a transformer for isolation, provides a bias circuit and ensures that the PHY module works normally.)

1. An Ethernet port communication circuit without a network transformer is characterized by comprising a first PHY module, a first bias module, an isolation module, a second bias module and a second PHY module;

wherein the first PHY module comprises a first transmitting port and a second transmitting port, and the second PHY module comprises a first receiving port and a second receiving port;

the first sending port and the second sending port are respectively connected with the first bias module;

the first receiving port and the second receiving port are respectively connected with the second bias module;

the first sending port is connected with the first receiving port through the isolation module; the second sending port is connected with the second receiving port through the isolation module.

2. An Ethernet port communication circuit according to claim 1, wherein the first bias module comprises a first resistor and a second resistor, wherein the first transmission interface is connected to a second end of the first resistor, the second transmission interface is connected to a second end of the second resistor, and a first end of the first resistor and a first end of the second resistor are connected to a first predetermined power supply.

3. An Ethernet port communication circuit according to claim 2, wherein the second bias module comprises a third resistor and a fourth resistor, wherein the first receiving interface is connected to a second terminal of the third resistor, the second receiving interface is connected to a second terminal of the fourth resistor, and a first terminal of the third resistor and a first terminal of the fourth resistor are connected to a second predetermined power supply.

4. An Ethernet port communication circuit according to claim 3, wherein the isolation module comprises a first capacitor and a second capacitor, the first transmission interface is connected to a first terminal of the first capacitor and a second terminal of the first resistor, and the second terminal of the first capacitor is connected to a second terminal of the fourth resistor and the first reception interface;

the second sending interface is connected with the first end of the second capacitor and the second end of the second resistor, and the second end of the second capacitor is connected with the second end of the third resistor and the second receiving interface.

5. The Ethernet port communication circuit according to claim 4, further comprising a third capacitor, wherein the third capacitor is configured to perform impedance matching, a first end of the third capacitor is connected to the second preset power supply, and a second end of the third capacitor is connected to the first end of the third resistor and the first end of the fourth resistor, respectively.

6. The Ethernet port communication circuit of claim 1, further comprising: the first biasing module is integrated within the first PHY module, and the second biasing module is integrated within the second PHY module.

7. An Ethernet port communication circuit according to claim 4, wherein the first resistor, the second resistor, the third resistor and the fourth resistor have the same resistance.

8. An Ethernet port communication circuit according to claim 4, wherein the capacitance values of the first capacitor and the second capacitor are the same.

9. An ethernet circuit board comprising the ethernet port communication circuit of any of claims 1-8.

10. An ethernet device comprising the ethernet circuit board of claim 8.

Technical Field

The invention relates to the technical field of communication, in particular to an Ethernet port communication circuit without a network transformer, a circuit board and Ethernet equipment.

Background

In a typical ethernet application, ethernet port Physical layers (PHYs) are connected by 100 ohm Unshielded Twisted Pair (UTP) wires. As shown in fig. 1, fig. 1 shows a typical ethernet interface circuit, which is composed of a Transformer (Transformer), an ethernet connector (RJ45), and several termination resistors and bypass capacitors.

Data transmission through the ethernet port physical layer requires a transmitting end PHY device and a receiving end PHY device, as shown in fig. 2, fig. 2 is a connection diagram of typical ethernet communication, the transmitting end PHY device is connected to an RJ45 of the receiving end through a transformer and a transmitting end RJ45 via a network cable, the RJ45 of the receiving end is connected to the transformer, the transformer is connected to the receiving end PHY device, and dc isolation is achieved through the transformer, so that no dc current is generated between the transmitting end PHY device and the receiving end PHY device, and the transformer can also provide a dc offset function on the PHY device.

However, in some devices that do not require transformer isolation, a transformer is used for connection, and at this time, the transformer loses the main isolation function and only provides a dc bias function, which results in waste of the transformer.

Disclosure of Invention

In view of the above technical problems, the present invention provides an ethernet port communication circuit, a circuit board and an ethernet device without a network transformer.

A first aspect of the present invention provides an Ethernet port communication circuit without a network transformer, comprising

The device comprises a first PHY module, a first bias module, an isolation module, a second bias module and a second PHY module;

wherein the first PHY module comprises a first transmitting port and a second transmitting port, and the second PHY module comprises a first receiving port and a second receiving port;

the first sending port and the second sending port are respectively connected with the first bias module;

the first receiving port and the second receiving port are respectively connected with the second bias module;

the first sending port is connected with the first receiving port through the isolation module; the second sending port is connected with the second receiving port through the isolation module.

Optionally, the first bias module includes a first resistor and a second resistor, where the first sending interface is connected to the second end of the first resistor, the second sending interface is connected to the second end of the second resistor, and the first end of the first resistor and the first end of the second resistor are connected to a first preset power supply.

Optionally, the second bias module includes a third resistor and a fourth resistor, where the first receiving interface is connected to a second end of the third resistor, the second receiving interface is connected to a second end of the fourth resistor, and a first end of the third resistor and a first end of the fourth resistor are connected to a second preset power supply. Alternatively,

the isolation module comprises a first capacitor and a second capacitor, the first transmitting interface is connected with a first end of the first capacitor and a second end of the first resistor, and the second end of the first capacitor is connected with a second end of the fourth resistor and the first receiving interface;

the second sending interface is connected with the first end of the second capacitor and the second end of the second resistor, and the second end of the second capacitor is connected with the second end of the third resistor and the second receiving interface.

Optionally, the ethernet port communication circuit further includes a third capacitor, where the third capacitor is configured to perform impedance matching, a first end of the third capacitor is connected to the second preset power supply, and a second end of the third capacitor is connected to the first end of the third resistor and the first end of the fourth resistor, respectively.

Optionally, the ethernet port communication circuit further includes: the first biasing module is integrated within the first PHY module, and the second biasing module is integrated within the second PHY module.

Optionally, the first resistor, the second resistor, the third resistor and the fourth resistor have the same resistance.

Optionally, the capacitance values of the first capacitor and the second capacitor are the same.

The second aspect of the present invention further provides an ethernet circuit board, which includes the ethernet port communication circuit of the first aspect.

The third aspect of the present invention further provides an ethernet device, including the ethernet circuit board of the second aspect.

The embodiment of the invention provides an Ethernet port communication circuit without a network transformer, an Ethernet circuit board and Ethernet equipment, which comprise a first PHY module, a first bias module, an isolation module, a second bias module and a second PHY module; the first PHY module comprises a first transmitting port and a second transmitting port, and the second PHY module comprises a first receiving port and a second receiving port; the first sending port and the second sending port are respectively connected with the first bias module; the first receiving port and the second receiving port are respectively connected with the second bias module; the first sending port is connected with the first receiving port through the isolation module; the second sending port is connected with the second receiving port through the isolation module, and the embodiment of the invention can be used for some equipment which does not need a transformer for isolation, provides a bias circuit and ensures that the PHY module works normally.

Drawings

FIG. 1 is a schematic diagram of a typical prior art Ethernet interface circuit;

FIG. 2 is a schematic diagram of a prior art Ethernet connection;

FIG. 3 is a schematic diagram of Ethernet port communication circuit connection without network transformer according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of Ethernet port communication circuit connection without network transformer according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of Ethernet port communication circuit connection without network transformer according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of Ethernet port communication circuit connection without network transformer according to an embodiment of the present invention;

fig. 7 is a schematic diagram of the ethernet port communication circuit connection without the network transformer according to the embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 3, an embodiment of the present invention provides an ethernet port communication circuit without a network transformer, including: a first PHY module 301, a first bias module 302, an isolation module 303, a second bias module 304, and a second PHY module 305;

the first PHY module 301 includes a first transmitting port and a second transmitting port, and the second PHY module includes a first receiving port and a second receiving port;

the first transmitting port and the second transmitting port are respectively connected with the first bias module 302;

the first receiving port and the second receiving port are respectively connected with the second bias module 304;

the first sending port is connected with the first receiving port through the isolation module 303; the second transmit port is connected to the second receive port through the isolation module 303.

Optionally, the first bias module includes a first resistor R1 and a second resistor R2, where the first transmission interface is connected to the second end of the first resistor, the second transmission interface is connected to the second end of the second resistor, and the first end of the first resistor and the first end of the second resistor are connected to a first preset power supply. The first preset power is VDD in fig. 4.

Optionally, the second bias module includes a third resistor R3 and a fourth resistor R4, where the first receiving interface is connected to the second end of the third resistor, the second receiving interface is connected to the second end of the fourth resistor, and the first ends of the third resistor and the fourth resistor are connected to a second preset power supply.

Optionally, the isolation module includes a first capacitor C1 and a second capacitor C2, the first transmitting interface is connected to the first end of the first capacitor and the second end of the first resistor, and the second end of the first capacitor is connected to the second end of the fourth resistor and the first receiving interface;

the second sending interface is connected with the first end of the second capacitor and the second end of the second resistor, and the second end of the second capacitor is connected with the second end of the third resistor and the second receiving interface. The first resistor, the second resistor, the third resistor and the fourth resistor have the same resistance value; the capacitance values of the first capacitor and the second capacitor are the same.

Specifically, as shown in fig. 4, the PHY chip in fig. 4 is a current-type chip, and needs to provide a suitable dc bias externally, and the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 provide dc biases for the transmitting end PHY (first PHY module) and the receiving end PHY (second PHY module), respectively, and also serve as termination resistors for matching transmission line impedance and preventing signal reflection. The transmitting end differential signal (TXP second transmitting port, TXM first transmitting port) and the receiving end differential input (RXP second receiving port, RXM first receiving port) are normally respectively provided with direct current bias, and are isolated from each other through a first capacitor C1 and a second capacitor C2. The resistance value of each resistor is 50 ohms, and the capacitance value of each capacitor is 100 nf.

The embodiment of the invention provides another ethernet port communication circuit without a network transformer, which specifically comprises a first PHY module, a first bias module, an isolation module, a second bias module and a second PHY module; the first PHY module comprises a first transmitting port and a second transmitting port, and the second PHY module comprises a first receiving port and a second receiving port;

the first sending port and the second sending port are respectively connected with the first bias module;

the first receiving port and the second receiving port are respectively connected with the second bias module;

the first sending port is connected with the first receiving port through the isolation module; the second sending port is connected with the second receiving port through the isolation module.

Optionally, the first bias module includes a first resistor and a second resistor, where the first transmission interface is connected to the second end of the first resistor, the second transmission interface is connected to the second end of the second resistor, and the first end of the first resistor and the first end of the second resistor are connected to a first preset power supply.

Optionally, the second bias module includes a third resistor and a fourth resistor, where the first receiving interface is connected to the second end of the third resistor, the second receiving interface is connected to the second end of the fourth resistor, and the first ends of the third resistor and the fourth resistor are connected to a second preset power supply.

Optionally, the isolation module includes a first capacitor and a second capacitor, the first transmitting interface is connected to the first end of the first capacitor and the second end of the first resistor, and the second end of the first capacitor is connected to the second end of the fourth resistor and the first receiving interface;

the second sending interface is connected with the first end of the second capacitor and the second end of the second resistor, and the second end of the second capacitor is connected with the second end of the third resistor and the second receiving interface.

The structure in the embodiment of the present invention is the same as that in the above embodiment, and further, description is not repeated here, and in the embodiment of the present invention, the ethernet port communication circuit further includes a third capacitor C3, where the third capacitor is used to perform impedance matching, a first end of the third capacitor is connected to a second preset power supply, and a second end of the third capacitor is connected to a first end of the third resistor and a first end of the fourth resistor, respectively. Wherein, the second preset power is VDD in fig. 4.

Namely, VDD is connected to one end of C3, the other end of C3 is connected to one end of R3 and R4, the other end of R3 is connected to RXM, and the other end of R4 is connected to RXP.

As shown in fig. 5, the ethernet port communication circuit further includes: the first biasing module is integrated within the first PHY module and the second biasing module is integrated within the second PHY module.

The second bias circuit is integrated in the PHY module of the receiving end, and the circuit is modified as shown in FIG. 5, wherein R3 and R4 are connected to VDD through C3 for realizing correct receiving end impedance matching.

The embodiment of the present invention provides another ethernet port communication circuit without a network transformer, and specifically, as shown in fig. 6, when PHYs used at a receiving end and a transmitting end are integrated with internal bias and terminal matching, the circuit can be further simplified, that is, an external circuit only has a capacitor for isolation.

The transformerless ethernet connection is suitable for both PHYs on the same PCB (permanently connected together by PCB wiring) and also for PHYs on blade servers that are connected together by a backplane bus in a single chassis system. A common reference is typically used between these PHYs. That is, two or more processors are on the same PCB, and there is a data interaction requirement for ethernet between them.

As shown in fig. 7, in the embodiment of the present invention, since the transformer is not provided, the isolation function is lost, and the function of the transformer on the dc bias of the PHY is also lost, and a specific rc bias circuit can be implemented according to the characteristics of the PHY chip, so that the PHY chip can normally operate.

In general, the transceivers of the PHY can be divided into current mode and voltage mode, and a terminal matching resistor is integrated inside the transceivers, so that the circuit design can be further simplified.

In the embodiment of the invention, circuit design optimization is carried out aiming at an Ethernet system which adopts backboard connection or non-cable connection without isolation, so that the layout of a Printed Circuit Board (PCB) is simplified, and a bill of materials (BOM) is saved, thereby reducing the cost.

The invention also provides an Ethernet circuit board which comprises the Ethernet port communication circuit.

The third aspect of the present invention further provides an ethernet device, which includes the ethernet circuit board described above.

The embodiment of the invention provides an Ethernet circuit board and Ethernet equipment, which comprise a first PHY module, a first bias module, an isolation module, a second bias module and a second PHY module; the first PHY module comprises a first transmitting port and a second transmitting port, and the second PHY module comprises a first receiving port and a second receiving port; the first sending port and the second sending port are respectively connected with the first bias module; the first receiving port and the second receiving port are respectively connected with the second bias module; the first sending port is connected with the first receiving port through the isolation module; the second sending port is connected with the second receiving port through the isolation module, and the embodiment of the invention can be used for some equipment which does not need a transformer for isolation, provides a bias circuit and ensures that the PHY module works normally.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.