Details of high speed connector design

Connector It is not unfamiliar to engineers. Connectors are bridges between components. So what are the details of designing high-speed connectors?

1. Signal.

Ensure that the minimum amount of signal loss is optimized for high speed Connector The key to success. Once the bandwidth of the connection is determined, we can further explore the S parameter and fully understand the essence of the connection. By collecting a comprehensive understanding of these aspects, users can understand the potential of fast connection. These s parameters are the measurement standards used by the manufacturer to classify the connector speed and should be paid great attention to. Also note the S parameter in the time domain, which is the time-dependent energy of the signal.

2. PCB termination options.

The importance of PCB end options must also be considered by designers. These options include surface mount, press fit, and in hole welding (PIH). Each of these options has advantages and disadvantages. The reason why crimping terminal is a reliable choice is its durability. These solid connections and PCB connections are very safe, but they challenge the high-speed connections usually required by users, making it difficult for high-density connectors to route signals to PCB. Because the terminal style usually requires more PCB layers, this will prolong the signal path, produce higher frequency discontinuities, and may inhibit the signal speed.

3. Surface mounted terminals.

The design of SMT is more sensitive to impedance matching, and the designer can connect directly with PCB. They are internally connected in the circuit board called embedded holes, which can improve the frequency response more effectively than crimping terminals. This method is more effective for high frequencies that experience losses in pressure fit options, but it is hardly durable, and additional installation hardware is usually required to establish the safety provided by pressure fit alternatives Connector 。

4. Paste the end of the hole.

The perforated terminal includes the characteristics of the first two styles. PIH style uses electroplated pinholes to weld contacts into PCB, similar to pressure fit. The obvious difference between the two styles lies in the pin length of PIH type and the hole used. The pin is much shorter, allowing the drill bit to reduce the redundant stub on the signal. The signal short line is related to the signal length on the transmission line, but unfortunately, the density of these styles hinders the communication with PCB.

5. Contact.

In the decision system, we must consider and Connector Match the contacts in the. Designers can make a variety of choices when determining the contact configuration, which are very similar to the termination alternatives. These options have their own advantages and disadvantages. One of these configurations is the edge mount connector, which is connected to the narrow rod guide with spring and PCB for higher continuity. However, impact and vibration pose a threat to the integrity of the connection under pressure, and the safety may require additional reinforcement.

6. Crimp connection.

Crimp connections are widely used for edge mounting Connector Connections under stresses that may not be handled. The rod and spring design similar to the edge mounted connector is adopted, but it provides additional functions and has advantages under high pressure. These contactors are very reliable due to the multiple contact points allowed to be connected. Pin layout, springs and additional functions can be closely connected to reduce the resistance of signal flow. The connection is tight, but there may be problems with the contact length. Sometimes the length of the edge mounted connector is exceeded, and sometimes the continuity is limited.