Signal Integrity Analysis And Research Of USB 3.1 Type C

The rapid development of electronic information has brought a lot of opportunities to related industries.Whether it is a personal electronic product or a space station are needed complex circuit systems to transmit power and information.These systems are very complex and are not made up of separate units,but are made up of many individual units connected by electrical connectors.In the low-speed era,people's requirements for electrical connectors are relatively simple.Tt is mainly the realization of the functions and logic.However with the increase of the transmission rate the electrical connector will have impedance discontinuity,high crosstalk and return loss when transmitting high-speed signals.This can not meet the high-speed circuit signal transmission requirements.Therefore it is necessary to conduct in-depth research on signal integrity issues and find a solution to the problem of signal integrity.In the research of this topic,a high-speed electrical connector named USB 3.1 Type C was selected as the research object.Combining the characteristics of the connector with the basic theory of signal integrity analyze the data obtained from the simulation find out the position of the connector that affects the signal integrity of the connector and modify and optimize the structure of the position.Then the structure of the location is modified to achieve the requirements of the electrical connector signal transmission and finally through the actual test thus verifying the reliability of the simulation results and the feasibility of the optimization results.First three-dimensional modeling of a high-speed electrical connector is performed using three-dimensional modeling software Pro/E.In the modeling process,after analyzing the characteristics of the model the irrelevant parts of the simulation calculations in the model are reduced to obtain a simplified model.Then the model is imported into the HFSS.The simulation is performed after the model is correct.After the simulation is completed the signal integrity problem of the high-speed electrical connector is analyzed based on the theoretical knowledge of signal integrity.Mainly by analyzing the time domain characteristics of the TDR and frequency domain characteristics of the S parameter to determine the electrical connector signal integrity of the degree of excellence and based on this to find out the location of the impact of signal integrity.Combine the simulation results with the connector model to find out where the impedance changes abruptly in this model.In this model,the following are the major impacts on the electrical connector: The part where the PIN in the high speed electrical connector plug contacts the gold finger on the socket;the cavity created by the electrical connector plug and socket connection.Through the analysis of the structure of these two parts,the optimization scheme was determined: the unnecessary lengths of the two ends of the electrical connector Pin and the gold finger on the socket were cut off;the space between the plug and socket contacts the cavity is properly adjusted.After several simulations,it was found that the signal integrity of the electrical connector was effectively improved,the impedance continuity was improved and the signal integrity was greatly improved.Then the electrical connector type is tested through the vector network analyzer.The data related to signal integrity is obtained through testing.By comparing the simulation data with the test data the reliability of the simulation result is confirmed.