RJ45 connector design principle and the use of a few problem points need to pay attention to?

RJ45 is a kind of information socket (i.e. communication lead-out end) connector in wiring system. RJ45 connector consists of a plug and a socket. The plug has 8 grooves and 8 contacts. This article mainly explains the design principle of RJ45 connector and 7 problems that need to be paid attention to when using RJ45 connector. I. Design Principle of RJ45 Connector RJ45 Connector consists of a plug and a socket. The connector composed of these two components is connected between the wires to achieve electrical continuity of the wires. When designing the signal integrity of the RJ45 connector, the following three principles need to be considered: 1. Crosstalk between the pins of the RJ45 connector; 2. Connectivity with the impedance of the entire interconnected transmission line; 3. If there is a timing request, consider the delay on the RJ45 connector.

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The analysis method of RJ45 connector is basically the same as the usual signal analysis method. Simulation software is used for simulation, and the results are analyzed to draw conclusions. The model analysis of RJ45 connector is the same as that of circuit. It is only important to pay attention to the accurate modeling and simulation of RJ45 and via effect. It is very important to guess the signal quality. The following are five models of RJ45 connector model analysis: 1. Single-wire model is a single wire suitable for RJ45, such as a high-speed signal transmission line, which can be used to imitate reflection, delay and offset, attenuation and signal transmission quality. 2. The S-parameter model is mainly used in the frequency domain, which can imitate throughput and crosstalk. After time domain change, it can generate impedance, crosstalk, transmission delay and eye diagram, etc. 3. The multi-wire model is suitable for multi-pin RJ45, including touch elements, touch-to-touch coupling, touch-to-shield coupling, pad-to-pad coupling, etc. In addition to the parameters imitated by SLM, it can also be used to imitate crosstalk and ground bombs. 4. IBIS model is a method to quickly and accurately model I/O BUFFER based on V/I curves, supporting all types of RJ45 and many different RJ45 modeling, such as differential and unbalanced signaling, SLM (uncoupled), MLM (coupled), model cascade, board-to-board and board-to-cable, etc. 5. SPICE model: It is the most widespread circuit-level imitation program. The components in the circuit to be analyzed can include resistors, capacitors, inductors, mutual inductances, independent voltage sources, independent current sources, various linear controlled sources, transmission lines and active semiconductor devices. 2. Seven problems that need to be paid attention to when using RJ45 connector 1. Use connected power supply and ground plane layer; 2. Try to prevent right angles in wiring; 3. Impedance manipulation, reflection and signal terminal matching; 4. Implement physical barrier on the active element to the noisy device; 5. The wiring length of the differential pair should be equal to ensure a good pressure ratio at the receiving end; 6. Crosstalk should be considered in high-speed circuit design, including near-end crosstalk and far-end crosstalk; 7. Power supply decoupling question, that is to say, the power supply added to the circuit must be decoupled by inductors and capacitors.

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